METHOD AND CATALYST FOR PRODUCING HIGH OCTANE COMPONENTS

Abstract

The group of inventions relates to a process of co-converting hydrocarbon feedstock with a high content of unsaturated hydrocarbons and aliphatic alcohols into components of high octane gasolines or aromatic hydrocarbons, as well as to catalysts of such a co-conversion. The method of co-converting hydrocarbon fractions and oxygenates into high octane components of fuels or aromatic hydrocarbons including contacting a hydrocarbon stream mixed with oxygenates with a catalyst under a reduced pressure and with heating. The process is carried under using a catalyst that contains the HZSM-5 zeolite that passed thermal and steam treatment.

Claims

1-6. (canceled)

7. A method of converting hydrocarbon fractions and oxygenates into a product, the method comprising: a. reacting a hydrocarbon feedstock and a water oxygenate mixture in the presence of a catalyst to form a conversion product; b. the catalyst comprises HZSM-5 zeolite, a binder; wherein the catalyst has been treated: with steam; and, a temperature of 450-500 C.; and, c. the water oxygenate mixture comprises 10% to 50% water; d. conducting reaction at a pressure from 1 to 50 bar, and at a reaction temperature of 290-460 C.; e. thereby producing the conversion product.

8. The method of claim 7, wherein the steam treatment comprises steam treating a binder.

9. The method of claim 8, wherein the binder comprises sodium silicate and aluminum oxide.

10. The method of claim 7, wherein the binder comprises pseudoboehmite.

11. The method of claim 7, wherein the binder comprises a mixture of pseudoboehmite and silica glass.

12. The method of claim 7, wherein the hydrocarbon feedstock comprises pyrolysis hydrocarbon fractions.

13. The method of claim 7, wherein the hydrocarbon feedstock comprises oligomer hydrocarbon fractions.

14. The method of claim 7, wherein the hydrocarbon feedstock comprises light fractions of catalytic cracking gasolines.

15. The method of claim 7, wherein the hydrocarbon feedstock comprises a mixture of hydrocarbon fractions, including those containing up to 85 wt. % of olefins,

16. The method of claim 7, wherein the hydrocarbon feedstock comprises hydrocarbon fractions selected from the group consisting of pyrolysis gasolines, oligomer gasolines, light fractions of catalytic cracking gasolines having a final boiling point of up to 150 C., straight-run hydrocarbon fractions containing components with boiling points in the range of 25-200 C., and fractions containing C.sub.2-C.sub.14 olefins.

17. The method of claim 7, wherein the oxygenate water mixture comprises up to 70% methanol.

18. The method of claim 7, wherein the oxygenate water mixture comprises up to 60% ethanol.

19. The method of claim 7, wherein the oxygenate water mixture comprises an oxygenate selected from the group consisting of methanol and ethanol.

20. The method of claim 7, wherein the conversion product comprises high octane components for use in formulating high octane gasolines.

21. The method of claim 7, wherein the conversion product comprises aromatic hydrocarbons.

22. The method of claim 7, wherein the hydrocarbon feedstock and water oxygenate mixture is feed to the reaction at a mass feed rate of 0.5-4 h.sup.1.

23. The method of claim 7, wherein the reaction temperature is 365-420 C.

24. The method of claim 7, wherein the pressure is 1 to 5 bar.

25. The method of claim 7, wherein the pressure is 3 bar.

26. The method of claim 7, wherein the catalyst further comprises a mixture of pentasil group zeolites having silicate moduluses, wherein the silicate moduluses comprises a zeolite having SiO.sub.2/Al.sub.2O.sub.3=15-30, previously treated with an aqueous alkaline solution and modified with oxides of rare earth elements in an amount of 0.5-2.0 wt. %, and the zeolite having SiO.sub.2/Al.sub.2O.sub.3=50-85 with a residual amount of sodium oxide of 0.04-0.15 wt. % taken in a ratio of 1.7/1 to 2.8/1.

27. The method of claim 7, wherein a sulfur content of the hydrocarbon feedstock is reduced.

28. The method of claim 7, wherein a sulfur content of the hydrocarbon feedstock is reduced; whereby the reduction comprises a 84% reduction.

29. The method of claim 7, wherein the hydrocarbon feedstock and water oxygenate mixture are feed to the reaction in a ratio, whereby water is supplied to the reaction at a volume ratio of water:hydrocarbon=1:10-50.

30. A method of converting hydrocarbon fractions and oxygenates into a product, the method comprising: a. reacting a hydrocarbon feedstock and a water oxygenate mixture in the presence of a catalyst to form a conversion product; b. the catalyst comprises HZSM-5 zeolite, a binder, wherein the catalyst has been treated with steam; c. the water oxygenate mixture comprises up to 50% water; wherein during the reaction the amount of water is increased; and, d. conducting the reaction at a pressure from 1 to 50 bar; e. thereby producing the conversion product.

31. The method of claim 30, wherein the steam treatment comprises steam treating a binder.

32. The method of claim 31, wherein the binder comprises sodium silicate and aluminum oxide.

33. The method of claim 30, wherein the binder comprises pseudoboehmite.

34. The method of claim 30, wherein the binder comprises a mixture of pseudoboehmite and silica glass.

35. The method of claim 30, wherein the hydrocarbon feedstock comprises pyrolysis hydrocarbon fractions.

36. The method of claim 30, wherein the hydrocarbon feedstock comprises a mixture of hydrocarbon fractions, including those containing up to 85 wt. % of olefins,

37. The method of claim 30, wherein the hydrocarbon feedstock comprises hydrocarbon fractions selected from the group consisting of pyrolysis gasolines, oligomer gasolines, light fractions of catalytic cracking gasolines having a final boiling point of up to 150 C., straight-run hydrocarbon fractions containing components with boiling points in the range 25-200 C., and fractions containing C.sub.2-C.sub.14 olefins.

38. The method of claim 30, wherein the oxygenate water mixture comprises an oxygenate selected from the group consisting of methanol and ethanol.

39. The method of claim 30, wherein the conversion product comprises high octane components for use in formulating high octane gasolines.

40. The method of claim 30, wherein the conversion product comprises aromatic hydrocarbons.

41. The method of claim 30, wherein the reaction is conducted at a temperature of 290-460 C.; and wherein the hydrocarbon feedstock and water oxygenate mixture is feed to the reaction at a mass feed rate of 0.5-4 h.sup.1.

42. The method of claim 30, wherein the reaction is conducted at a temperature of 365-420 C. and at a pressure of 1 to 5 bar.

43. The method of claim 30, wherein the reaction is conducted at a temperature of 290-460 C.

44. The method of claim 30, wherein a sulfur content of the hydrocarbon feedstock is reduced.

45. The method of claim 30, wherein the hydrocarbon feedstock and water oxygenate mixture are feed to the reaction in a ratio, whereby water is supplied to the reaction at a volume ratio of water:hydrocarbon=1:10-50.

46. The method of claim 30, wherein the catalyst has been treated with a temperature of 450-500 C.

47. A method of converting hydrocarbon fractions and oxygenates into a product, the method comprising: a. reacting a hydrocarbon feedstock, the feedstock comprising sulfur defining a first sulfur content, and a water oxygenate mixture in the presence of a catalysis to form a conversion product; b. the catalyst comprises HZSM-5 zeolite, wherein the catalyst has been treated: with steam; and, a temperature of 450-500 C.; c. the water oxygenate mixture comprises water and an oxygenate selected from the group consisting of methanol and ethanol; and, d. conducting the reaction at a temperature of 290-460 C.; e. thereby producing a conversion product having a second sulfur content; wherein the second sulfur content is lower than the first sulfur content.

48. The method of claim 47, wherein the steam treatment comprises steam treating a binder.

49. The method of claim 48, wherein the binder comprises sodium silicate and aluminum oxide.

50. The method of claim 47, wherein the binder comprises pseudoboehmite.

51. The method of claim 47, wherein the binder comprises a mixture of pseudoboehmite and silica glass.

52. The method of claim 47, wherein the hydrocarbon feedstock comprises light fractions of catalytic cracking gasolines.

53. The method of claim 47, wherein the hydrocarbon feedstock comprises a mixture of hydrocarbon fractions, including those containing up to 85 wt. % of olefins,

54. The method of claim 47, wherein the hydrocarbon feedstock comprises hydrocarbon fractions selected from the group consisting of pyrolysis gasolines, oligomer gasolines, light fractions of catalytic cracking gasolines having a final boiling point of up to 150 C., straight-run hydrocarbon fractions containing components with boiling points in the range of 25-200 C., and fractions containing C.sub.2-C.sub.14 olefins.

55. The method of claim 47, wherein the oxygenate water mixture comprises 70% methanol.

56. The method of claim 47, wherein the conversion product comprises high octane components for use in formulating high octane gasolines.

57. The method of claim 47, wherein the hydrocarbon feed stock and water oxygenate mixture is feed to the reaction at a mass feed rate of 0.5-4 h.sup.1.

58. The method of claim 47, wherein the reaction temperature is 365-420 C.

59. The method of claim 47, wherein the reaction is conducted at a pressure of 1 to 5 bar.

60. The method of claim 47, wherein the catalyst further comprises a mixture of pentasil group zeolites having silicate moduluses, wherein the silicate moduluses comprises a zeolite having SiO.sub.2/Al.sub.2O.sub.3=15-30, previously treated with an aqueous alkaline solution and modified with oxides of rare earth elements in an amount of 0.5-2.0 wt. %, and the zeolite having SiO.sub.2/Al.sub.2O.sub.3=50-85 with a residual amount of sodium oxide of 0.04-0.15 wt. % taken in a ratio of 1.7/1 to 2.8/1.

61. The method of claim 47, wherein the lower sulfur content comprises a 84% reduction in sulfur content.

62. The method of claim 47, wherein the hydrocarbon feedstock and water oxygenate mixture are feed to the reaction in a ratio, whereby water is supplied to the reaction at a volume ratio of water:hydrocarbon=1:10-50.

63. A catalyst for carrying out a method of co-converting hydrocarbon fractions and oxygenates into high octane components of fuels or aromatic hydrocarbons, the catalyst comprising: a HZSM-5 zeolite comprising a silicate modulus of SiO.sub.2/Al.sub.2O.sub.3=50-81.9 with a residual amount of sodium oxide of 0.04-0.15 wt. % in an amount of 65-69.8 wt. %; zinc oxide in an amount of 1.5-2 wt. %; oxides of rare earth elements in an amount of 1-2 wt. %; oxides, sulfides or both of Group VIII metals in an amount of 0.5-1 wt. %; a binder having a balance of 100%, wherein the binder is a mixture of alumina in an amount of 30.1-69.9% by weight and silicon oxide in an amount of 69.9-30.1% by weight; and wherein the HZSM-5 zeolite has passed a thermal and steam treatment before a catalyst preparation step.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 presents data of the derivatographic study of samples of catalysts from Example No. 1 (A) and No. 4 (B) after operation for 82 and 56 hours.

EMBODIMENT OF THE INVENTION

[0020] The catalyst is prepared as follows. The pentasil type zeolite (HZSM-5 with a silica modulus of SiO.sub.2/Al.sub.2O.sub.3=70-81.9 with a residual amount of sodium oxide of 0.04-0.15 wt. %) in the form of a powder is preliminarily subjected to dealumination by means of its thermal and steam treatment in a stream of moist air having a water vapor partial pressure of 10-60 kPa at a temperature of 500-550 C., and then the produced zeolite and binder are mixed by any means such as stirring, kneading or otherwise. The binder is a mechanical mixture of pseudoboehmite and silica glass that during the final calcination forms a mixture of aluminum oxide (30.1-69.9% wt.) and silicon oxide (69.9-30.1 wt. %). Further, the zeolite-binder mixture is extruded to form granules, the granules are dried in air at 90 C. and calcined at 450-500 C. for 2-4 hours. The produced catalyst substrate is subjected to modification with metals of Group II and III during simultaneous impregnation of granules based on moisture capacity from an aqueous solution of zinc nitrate and a mixture of rare earth elements (REE). The proposed method uses a REE concentrate having the following composition: lanthanum nitrate (50-60%), cerium (8-10%), praseodymium (1-2%) and neodymium (the rest). Additionally, the catalyst is admixed with oxides and/or sulfides of Group VIII metals, preferably those of nickel. After these operations, the finished catalyst is subjected to final calcination in air at 550 C. for 2-4 hours.

[0021] It has been observed that when alumina is used as a binder, during the catalyst operation it is converted to hydroxide and the catalyst loses its strength properties, but when silicon oxide is used, the pores in the matrix are small enough for the reactants to access the active sites of the HZSM-5 zeolite. Whereas, when used together, the binder features the formation of the required pores and its mechanical properties increase after the thermal and steam treatment. At the same time, cheap and readily available components are used, compared, for example, with zirconium oxide. A similar effect was observed with respect to zeolite, namely, that its thermal and steam treatment should be carried out before it is mixed with the components of which the binder is formed during thermal treatment. With the thermal and steam treatment, the acid (Lewis and Broensted) active sites required for the reaction are formed in zeolite. Precisely because of this, and because the initial components of the binder are a mixture of sodium silicate and aluminum oxide, a composite product is produced that can be operated for a long time in the environment of superheated steam, while the catalytic properties of zeolite are preserved and a mesoporous structure (transport channels for reactant access to the active sites of the HZSM-5 zeolite) is formed in this composite material. After regeneration of the catalyst with a mixture of nitrogen and oxygen after the first 200 hours of operation cycle length of the catalyst in an environment containing superheated steam or after additional thermal and steam treatment at a temperature of 600 C, obtained by the described above method of catalyst an increase in the strength properties of the catalyst was observed. Since the mechanical crush strength of the catalyst granules increased from 5.5 MPa to 8.7 MPa, without changing its other performance properties (change of gasoline yield with increased knock characteristic while maintaining of selectivity on alkylaromatics, duration of cycle length).

[0022] It should be noted that when alumina in an amount of less than 30.1% by weight is used in the binder, the combination of acidity properties of the HZSM-5 zeolite used in the catalyst and alumina as a single active component of the catalyst, required in order to obtain a high quality product (co-processing gasoline) with the desired aromatic hydrocarbon content, is not ensured.

[0023] When using alumina in the binder in an amount of more than 69.9% by weight, during the catalyst operation the catalyst loses its strength properties due to the partial conversion of the alumina to aluminum hydroxide.

[0024] It should also be noted that when silica is used in the binder in an amount of less than 30.1% by weight, the required catalyst pellet strength is not reached.

[0025] When silicon oxide is used in an amount of more than 69.9% by weight, the required pores (transport channels) are not formed in the binder in an amount sufficient for the reactants to access the active sites of zeolite HZSM-5.

[0026] It should also be noted that when the HZSM-5 zeolite is used having a silicate modulus of SiO.sub.2/Al.sub.2O.sub.3=70-81.9 subjected to the thermal and steam treatment before the stage of catalyst preparation in an amount of less than 65.0 wt. %, the catalyst activity decreases. When the said zeolite is used in an amount of more than 69.8% by weight, the required pellet strength of the catalyst operating at high temperature in the presence of steam is not reached.

[0027] A distinctive feature of the catalyst is that during its preparation, the HZSM-5 zeolite determining the catalytic properties of the finished catalyst has already been subjected to the thermal and steam treatment, which considerably increases its resistance to water vapor and, in addition, a combination of silica and alumina is used as a binder, which confers additional stability to the catalyst (including increased mechanical strength) in the high temperature conversion process in the presence of water addition to raw materials. In addition, a feature of the catalyst is that the zeolite catalyst acidity controlled by the addition of zinc and rare earth oxides allows simultaneously conducting aromatization reactions of C.sub.5-C.sub.10 unsaturated hydrocarbons, and the alkylation reactions of lowest aromatics (e.g. benzene, toluene) with methyl fragments of methanol and/or with ethylene and propylene formed (in situ) during the conversion of methanol, which results in production of aromatic hydrocarbon fractions with a high content of C.sub.8 aromatic, which can then be used in organic syntheses.

[0028] The choice of catalyst that contains only a high modulus medium acidity zeolite (SiO.sub.2/Al.sub.2O.sub.3=70-81.9), as well as the choice of a low-pressure process, allow reducing the intensity of the oligomerization of C.sub.6-C.sub.10 olefins that are present in large quantities in the pyrolysis and oligomer gasolines, while increasing the aromatization contribution of these components to the produced product. It is generally known that it is C.sub.12-C.sub.20 (or higher) high molecular weight oligomers that are precursors of coke.

[0029] The combination of all the above catalyst features enables to solve the specified technical problem and to achieve the desired technical result.

[0030] The proposed method may use, as the hydrocarbon fractions, pyrolysis gasolines with high content of aromatic and unsaturated compounds, olefin-containing fractions of low octane gasolines, including oligomer gasolines, light fractions of catalytic cracking gasolines (with a final boiling point up to 150 C.), and straight-run hydrocarbon fractions, refined products from extractive distillation processes of aromatic hydrocarbons, C.sub.5-C.sub.6 fractions of reforming gasolines, and mixtures thereof.

[0031] The method of co-converting hydrocarbon fractions and oxygenates is carried out at a pressure of 1-5 bar, preferably 3 bar, and at temperatures of 365-460 C. The proposed method is characterized in that the process is carried out using a catalyst that contains the HZSM-5 zeolite that has passed thermal and steam treatment, and that oxygenates, preferably methanol or ethanol diluted with water, are used as part of the raw materials, which finally results in an increase in the yield and/or aromatic hydrocarbon concentrations in liquid products, as well as in the decrease in the coke formation and, consequently, in the increase in the catalyst cycle length when running on olefin hydrocarbon feedstock.

[0032] In more detail, the proposed group of inventions is described by the following examples, which are for illustration only and are not restrictive.

Example 1

[0033] The process is carried out in a flow isothermal reactor heated by a peripheral heat pipe while contacting 100 cm.sup.3 of catalyst (the bed height is 25 cm) heated to 420 C. with feedstock consisting of 2 streams: pyrolysis gasoline (from Ufa Refinery) and 70% methanol solution in water, which are mixed in a mixer that is a precontact zone (quartz beads placed in the reactor upstream the frontal catalyst bed). The flow rate of the pyrolysis gasoline and aqueous solution of methanol was 50 and 65 ml/h, respectively. The methanol conversion was 100% at the initial time point after start-up (the first 6 hours). The experiment was carried out until reduction in methanol conversion from 100 to 95% was observed. The liquid catalysate produced during the experiment was cooled down to 18 C. and was separated into a hydrocarbon (gasoline) and an aqueous phase, stabilization gases upon completion of the experiment.

[0034] The hydrocarbon fraction was weathered at room temperature for 30 minutes and analyzed using the Crystallux chromatograph while using the SE-30 (30 m) capillary column and FID detector. The methanol content in the aqueous phase was determined by chromatography using the Heyesep-Q (m 3) packed column and TCD detector.

Example 2

[0035] The process was performed as in Example No. 1, except for using the oligomer gasoline (produced by Orlen Lietuva) and a 50% solution of ethanol in water. The flow rate of oligomer gasoline and ethanol solution in water was 120 and 30 ml/h, respectively.

Example 3

[0036] The process was performed as in Example No. 1, except for using a mixed fraction consisting of 50% vol. of light fraction catalytic cracking gasoline (from Ufa Refinery) having an initial boiling point of 110 C., and the rest was the fraction of gas condensate having a final boiling point of 150 C. and 90% methanol in water. The flow rate of the straight-run gasoline fraction and methanol solution in water was 100 and 40 ml/h, respectively. The said mixed fraction contained up to 0.3-0.5% by weight of C.sub.5+ diene and triene hydrocarbons. The life experiment was conducted for a long time (440 hours). The process temperature during the experiment was increased by 5 C. when the conversion of methanol reduced to 95%.

Example 4

[0037] The process was performed as in Example No. 1, except for using as a raw material butane-butylene fraction (BBF) contained butenes 83% by weight, which includes butadienes 0.3% by weight. Feed BBF fraction and 98% solution of methanol in water was 30 and 330 ml/h, respectively.

Example 5

[0038] The process was performed as in Example No. 1, except that instead of 65 ml/hr of 70% methanol solution in water, the A.s. pure grade methanol at a flow rate of 50 ml/hr was taken.

[0039] The catalyst used in Examples Nos. 1-4 had the following composition (wt. %): [0040] HZSM-5 zeolite having a silicate modulus of SiO.sub.2/Al.sub.2O.sub.3=81.9 with a residual amount of sodium oxide of 0.04 wt. % subjected to the thermal and steam treatment before the catalyst preparation step: 69.8 wt. %. [0041] Zinc oxide: 2 wt. %. [0042] REE oxides: 1.5 wt. %. [0043] Nickel oxide: 0.5 wt. %. [0044] Binder (mixture of alumina: 50 wt. % and silicon oxide: 50 wt. %), the rest up to 100%.

[0045] The process conditions and composition of the main components of hydrocarbon feedstock and liquid product obtained using the present process (Examples Nos. 1-3), and through the comparative Example (No. 4) are specified in Table 1.

TABLE-US-00001 TABLE 1 Mixed fraction consisting of a mixture of light fraction of catalytic cracking gasoline, 50% vol., and the Pyrolysis Oligomer rest is light Example Example Example Example Example BBF gasoline gasoline gas condensate. No. 1 No. 2 No. 3 No. 4 No. 5 Temperature, C. 420-450 380 365-390 290-330 420-460 Pressure, bar 5 1 3 20 5 Components of the hydrocarbon fraction, % wt. The total content 0 87.2 8.1 3.75 89 70.1 68.4 15.8 90 of aromatic hydrocarbons, which includes: Benzene (C6) 36.51 3.3 0.45 13.3 8.2 2.7 0.2 13.3 Toluene (C7) 18.86 2.1 3.17 24.5 23.7 16.7 0.5 24.5 Ethylbenzene + 4.65 1.9 0.13 28.3 26.6 27.9 2.4 28.2 xylenes (C8) Olefins C5-C9 0 7.2 0.5 11.4.8 11.6 21.0 20 0.3 Iso- and n- 0 7 56.1 83.96 4.4 14.2 30.8 64.2 5.7 paraffins, naphthenes C5-C8 n-butane 1 2 Isobutane 4. 5 Olefines C4 8 3 Indicators Yield of gasoline 120 108.9 89.1 89.6 120.2 to the original gasoline, % Stability of 82 70 110/400** 120 56 catalyst operation, hour* *Stability was evaluated by the time of the catalytic work until the decrease in the conversion of oxygenates from 100 to 98%. **Time was fixed at the moment of the temperature rise at the end of the catalyst layer from 385 to 390 C.

[0046] Table 1 shows that in case of the embodiment of the method by Example No. 1, the concentration of styrene reduces significantly (by more than 10 times) (down to 0.15%) in the resulting fraction of aromatic hydrocarbons, however, unsaturated compounds such as dienes, trienes, and indene were not detected in the resultant fractions.

[0047] The yield of the produced liquid product and aromatic hydrocarbon content therein is significantly higher (120.0% and 95.1, respectively) than that in the prior art for the conversion of olefins from a mixture of 50/50 PPF and BBF (78.2 and 91.8%, respectively).

[0048] In addition, Table 1 shows that in case of the embodiment of the proposed method by Example No. 2, during conversion of oligomer gasoline containing up to 40% olefins, but different in chemical composition from pyrolysis gasoline, a yield of liquid product (108.9%) higher than that in the prior art is reached as well. As the temperature rises, the aromatic content will increase to 80% only, as the yield of liquid hydrocarbons decreases.

[0049] In addition, Table 1 shows that in case of the embodiment of the proposed method by Example No. 3, during the conversion of gasoline mixture, a higher yield of liquid product (89.1%) than that in the prior art is reached as well.

[0050] Table 1 also shows that in case of the embodiment of the proposed method by Example No 4 g during butylene fraction, a higher yield of liquid product (89.6%) than that in the prior art is reached as well, with a low content of aromatics and olefins, which allows to use the product as a high octane gasoline component with a reduced content of aromatics and olefins. The octane number by research method for the resulting liquid product is 95.6 units.

[0051] Lifetime tests of Example No. 3 at an initial temperature of 365 C. show that the catalyst can operate efficiently for 440 hours while ensuring 100% methanol conversion and higher yield of gasoline produced with a higher content of aromatic hydrocarbons (in terms of an initial gasoline yield of about 102%), wherein the temperature of the process is moderate and is no more than 390 C. It should be noted that when the process temperature is increased up to 420 C. and the pressure is reduced from 3 bar down to the atmospheric pressure, the aromatic hydrocarbon content can be increased up to 80%, while the yield of liquid products is no less than 89% of the initial hydrocarbon fraction.

[0052] In addition, the concentration of iso-, n-paraffins, C.sub.6-C.sub.8 naphthenes, and olefins is substantially (by several times) decreased in gasolines formed in Examples Nos. 1 and 5 (see Table. 1). This further facilitates isolation of individual C.sub.6-C.sub.8 aromatic hydrocarbons and does not require the expensive extractive distillation.

[0053] The comparison of pyrolysis gasoline conversion using the proposed method (Example No. 1) and by Example No. 5, wherein pure methanol is used instead of an aqueous methanol solution, shows that in Example No. 1, as compared with Example No. 5, the stable operation time of catalyst is significantly (by 1.5 times) increased, wherein the component composition of the produced product is practically unchanged.

[0054] FIG. 1 shows the comparative derivatograms produced by way of thermally programmed burning of coke deposits, catalyst samples of Example No. 1 proposed in the present invention and by Example No. 5. When they are compared, it is evident that the use of water additives to oxygenates (methanol) leads to a substantial reduction in the amount of coke in the catalyst samples (7.9% instead of 9.9%), which ultimately leads to an increase in the stable operation time of catalyst (see Table. 1).

[0055] In the proposed method in the present group of inventions, water is both available as part of an aqueous alcohol solution, and formed during the conversion of the latter, in this connection, the positive effect of reducing the coking primarily occurs in the front layer of the catalyst (that assumes the basic chemical conversion of feedstock).

[0056] Thus, the aggregate of all of the above catalyst features and method of the co-conversion of hydrocarbon fractions and oxygenates into high octane components of fuel or aromatic hydrocarbons, respectively, allows solving a common technical problem and achieving the desired overall technical result obtained by the embodiment of the proposed group of inventions as follows: [0057] Improving the yield and concentration of aromatic hydrocarbons in liquid products, wherein the subsequent separation of the individual C.sub.6-C.sub.8 aromatics does not require the highly expensive extractive distillation method, because the inventive method allows significantly reducing the concentration of isoparaffins, n-paraffins, olefins, and C.sub.6-C.sub.8 naphthenes boiling in the temperature range of separated aromatic hydrocarbons. [0058] Increasing catalyst cycle length when running on the olefin-containing hydrocarbon feedstock. [0059] Simplifying the process design through the use of lower (including atmospheric) pressure.

[0060] Further in the embodiment of the method, instead of using pure alcohols, it becomes possible to use cheaper oxygenates, for example, raw methanol having an alcohol content of up to 85%, and beverage industry waste. It should be noted that in the embodiment of the proposed method, there is a significant reduction in the sulfur content in the resultant fraction of aromatic hydrocarbons (see Table 2), which is also important, because the fraction of aromatic hydrocarbons can then be used as a component of high octane gasolines.

Table 2. Changes in the Sulfur Content in Products of Pyrolysis Gasoline Conversion Version

[0061]

TABLE-US-00002 TABLE 2 Changes in the sulfur content in products of pyrolysis gasoline conversion Sulfur content, Product description wt. % Pyrolysis gasoline 0.0063 Product of conversion 0.001 according to Example No. 1

[0062] The above-described group of inventions can be used in the refining and petrochemical industry to produce high octane components of gasoline or their base (the main component) as well as to produce individual aromatic hydrocarbons (benzene, toluene, xylene) isolated during simple distillation and being widely demanded solvents and reagents for production of more complex organic compounds, such as cumene.

[0063] The proposed group of inventions can be used for processing of pyrolysis gasolines that constitute the raw material for production of benzene, toluene, xylenes or homologs thereof being valuable in petrochemistry [Orochko, D. I., et al. Hydrogenation processes in oil refining. M.: Chemistry, 1997, 197 pp.], as well as for processing of oligomer gasolines to be obtained by oligomerization of light C.sub.2-C.sub.4 olefins from propylene-propane and butane-butene fractions, gasolines of catalytic dewaxing of middle distillates and mixtures thereof with various hydrocarbon fractions, including straight-run gasoline fractions. These gasolines are of limited use as motor fuels, as they contain large amounts of unsaturated hydrocarbons and do not meet the requirements of technical regulations of the Customs Union TR CU 013/2011 for grade 5 gasolines. Efficient use of pyrolysis gasolines, oligomer-gasolines and their mixtures with hydrocarbon fractions of various origin is complicated due to the presence of rapidly resinifying unsaturated (styrene, phenylacetylene, etc.), and diene hydrocarbons. Resins formed in such gasolines equally prevent both extraction of aromatic components, and their use as components of high octane fuels.

[0064] Despite the fact that the proposed group of inventions has been described in detail in the exemplary embodiments that appear to be preferable, it should be remembered that these embodiments are given to illustrate the group of invention only. This description should not be construed as limiting the scope of the group of inventions, because the experts in the field of oil, petrochemicals, physics, etc. may introduce changes in the steps of the described methods and the catalyst, which are aimed at adapting them to specific devices or situations, and which do not go beyond the scope of the attached claims of the group of inventions. One skilled in the art will appreciate that within the scope of application of the group of inventions, which is defined by the claims, various options and modifications, including equivalent solutions, are possible.