Desulfurizer for conversion and absorption of high-concentration carbonyl sulfide and a desulfurizer for catalytic conversion and absorption of carbon disulfide and their preparation methods

Abstract

Provided is a high-concentration carbonyl sulfide conversion-absorption type desulfurizer for use at medium-low temperature and preparation method thereof. The desulfurizer comprises 50%-75% magnetic iron oxide red (Fe.sub.21.333O.sub.32), 5%-10% alkali metal oxide (K.sub.2O), 5-35% anatase TiO.sub.2, and 5-10% shaping binder. The method of preparing the desulfurizer comprises: uniformly mixing a metatitanic acid prepared using ferrous sulfate recycled as a by-product from titanium dioxide production with K.sub.2CO.sub.3, calcining to activate at 500 C.-700 C., mixing with the magnetic iron oxide red and binder, roll molding at room temperature to form balls which are dried at 100 C.-150 C. to obtain the desulfurizer. The desulfurizer has a hydrolysis conversion of carbonyl sulfide higher than 99%, and has a higher sulfur capacity more than 25%.

Claims

1. A method for preparing a desulfurizer, the method comprising: (1) mixing and reacting a FeSO.sub.4 solution with an alkaline substance solution or solid by controlling the alkali ratio of the alkaline substance solution or solid and the FeSO.sub.4 solution to 1-1.1 to form a first mixture, filtering the first mixture to yield a filter cake, and calcining the filter cake at a temperature of 250-400 C. to yield the magnetic iron oxide red Fe.sub.21.333O.sub.32; or mixing and kneading a FeSO.sub.4 solid with an alkaline substance solid by controlling the alkali ratio of the alkaline substance solid and the FeSO.sub.4 solid to 1-1.1 to form a first mixture, followed by washing with water and filtering the first mixture to yield a filter cake, and calcining the filter cake at a temperature of 250-400 C. to yield the magnetic iron oxide red Fe.sub.21.333O.sub.32; and (2) mixing 50-75 parts by weight of the magnetic iron oxide red Fe.sub.21.333O.sub.32 with 5-35 parts by weight of anatase type TiO.sub.2, 5-10 parts by weight of K.sub.2O and 5-10 parts by weight of a binder to form a second mixture, followed by roll molding at room temperature and drying the second mixture to produce the desulfurizer; wherein the anatase type TiO.sub.2 and K.sub.2O in Step (2) are prepared by mixing and calcining 6.1-42.7 parts by weight of metatitanic acid and 7.3-14.7 parts by weight of K.sub.2CO.sub.3 at a temperature of 500-700 C.

2. The method of claim 1, wherein the filter cake in the step (1) is calcined at 350 C. for 2-5 hours.

3. The method of claim 1, wherein the alkaline substance is selected from the group consisting of hydroxides of Group IA, Na.sub.2CO.sub.3, (NH.sub.4).sub.2CO.sub.3, K.sub.2CO.sub.3, NaHCO.sub.3, NH.sub.4HCO.sub.3, KHCO.sub.3 and any combination thereof.

4. The method of claim 1, wherein the metatitanic acid is prepared by a method comprising preparing a ferrous sulfate solution by dissolving a ferrous sulfate solid in water, wherein the ferrous sulfate solid is a by-product from titanium dioxide production by a sulfuric acid method, heating the ferrous sulfate solution up to 40-100 C., adjusting a pH value of the ferrous sulfate solution to 1-2 by adding an acid, and reacting the ferrous sulfate solution with a flocculating agent to yield a precipitate, followed by filtering the precipitate to obtain the metatitanic acid.

5. The method of claim 4, wherein the ferrous sulfate solution has a FeSO.sub.4 concentration of 1-2.5 mol/L.

6. The method of claim 4, wherein the acid added for adjusting the pH value is selected from the group consisting of nitric acid, hydrochloric acid, sulfuric acid and any combination thereof.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 shows the XRD pattern of the magnetic iron oxide red Fe.sub.21.333O.sub.32 prepared in the present invention.

DESCRIPTION OF EMBODIMENTS

Example 1

(2) The Preparation of Metatitanic Acid

(3) Addling 5 kg of ferrous sulfate solid which is a by-product from titanium dioxide production by a sulfuric acid method into a reactor, dissolving the ferrous sulfate solid with 6 L of water to form a ferrous sulfate solution, heating the ferrous sulfate solution at 60 C. for 30 min, adjusting a pH value of the ferrous sulfate solution to 1 by adding an acid, and reacting the ferrous sulfate solution with polyacrylamide as a flocculating agent to yield a precipitate, followed by filtering the precipitate while hot to obtain a metatitanic acid solid A, and finally drying the metatitanic acid solid A at 110 C. for 1 h.

(4) Adding 1.67 kg of ferrous sulfate solid which is a by-product from titanium dioxide production by a sulfuric acid method into a reactor, dissolving the ferrous sulfate solid with 6 L of water to form a ferrous sulfate solution, heating the ferrous sulfate solution at 100 C. for 30 min, adjusting a pH value of the ferrous sulfate solution to 2 by adding an acid, and reacting the ferrous sulfate solution with a flocculating agent polyacrylamide to yield a precipitate, followed by filtering the precipitate while hot to obtain a metatitanic acid solid B, and finally drying the metatitanic acid solid B at 110 C. for 1 h.

Example 2

(5) The Preparation of Anatase Type TiO.sub.2 and K.sub.2O

(6) Mixing the metatitanic acid A prepared by example 1 and K.sub.2CO.sub.3 and calcining at a temperature of 500 C. to obtain the anatase type TiO.sub.2 and K.sub.2O.

Example 3

(7) The desulfurizer of the present example comprises magnetic iron oxide red Fe.sub.21.333O.sub.32 in an amount of 50 parts by weight, anatase-type TiO.sub.2 in an amount of 5 parts by weight, K.sub.2O in an amount of 5 parts by weight, and bentonite in an amount of 5 parts by weight.

(8) The method for preparing the desulfurizer for catalytic conversion and absorption of carbonyl sulfide comprises:

(9) (1) putting 500 g of FeSO.sub.4.7H.sub.2O solid into a beaker, adding 6 L of water into the beaker and putting the beaker into a water bath at 40 C. until the solid therein is completely dissolved to form a FeSO.sub.4 solution, adding 190 g of Na.sub.2CO.sub.3 into the FeSO.sub.4 solution by controlling the alkali ratio of the Na.sub.2CO.sub.3 and FeSO.sub.4 to 1, and reacting for 2 h under stirring to form a first mixture; then filtering the first mixture to yield a filter cake, and calcining the filter cake at a temperature of 350 C. for 3 h to yield the magnetic iron oxide red Fe.sub.21.333O.sub.32; and

(10) (2) mixing 50 parts by weight of the magnetic iron oxide red Fe.sub.21.333O.sub.32 with 5 parts by weight of anatase-type TiO.sub.2, 5 parts by weight of K.sub.2O, and 5 parts by weight of bentonite to form a second mixture, followed by roll molding at room temperature to form balls having diameter of 4 to 6 mm, and drying the balls to produce the desulfurizer.

(11) The anatase-type TiO.sub.2 and K.sub.2O in the present example are prepared by the example 2.

Example 4

(12) The desulfurizer of the present example comprises magnetic iron oxide red Fe.sub.21.333O.sub.32 in an amount of 75 parts by weight; anatase-type TiO.sub.2 in an amount of 35 parts by weight; K.sub.2O in an amount of 10 parts by weight; and Yang Gan soil in an amount of 10 parts by weight.

(13) The method for preparing the desulfurizer for catalytic conversion and absorption of carbonyl sulfide comprises:

(14) (1) mixing 500 g of FeSO.sub.4.7H.sub.2O solid with 333 g of NaHCO.sub.3 solid by controlling the alkali ratio of NaHCO.sub.3 and FeSO.sub.4.7H.sub.2O to 1.1 and kneading them in a coating pan for 2 h to yield a first mixture; followed by washing with water for 3 times and filtering the first mixture to yield a filter cake, and calcining the filter cake at a temperature of 350 C. for 3 h to yield the magnetic iron oxide red Fe.sub.21.333O.sub.32, which is then ground and screened to obtain Fe.sub.21.333O.sub.32 powder of 200 mesh; and

(15) (2) mixing 75 parts by weight of the magnetic iron oxide red Fe.sub.21.333O.sub.32 with 35 parts by weight of anatase-type TiO.sub.2, 10 parts by weight of K.sub.2O, and 10 parts by weight of Yang Gan soil to form a second mixture, followed by roll molding at room temperature to form balls having diameter of 4 to 6 mm, and drying the balls to produce the desulfurizer.

(16) The anatase-type TiO.sub.2 and K.sub.2O in the present example are prepared by example 2.

Example 5

(17) The desulfurizer of the present example comprises magnetic iron oxide red Fe.sub.21.333O.sub.32 in an amount of 59 parts by weight; anatase-type TiO.sub.2 in an amount of 15 parts by weight; K.sub.2O in an amount of 8 parts by weight; and attapulgite in an amount of 5 parts by weight.

(18) The method for preparing the desulfurizer for catalytic conversion and absorption of carbonyl sulfide comprises:

(19) (1) putting 500 g of FeSO.sub.4.7H.sub.2O solid into a beaker, adding 454 mL of water into the beaker and putting the beaker into a water bath at 40 C. until the solid therein is completely dissolved to form a FeSO.sub.4 solution, adding 190 g of Na.sub.2CO.sub.3 into the FeSO.sub.4 solution by controlling the alkali ratio of the Na.sub.2CO.sub.3 and FeSO.sub.4 to 1, and reacting for 2 h under stirring to form a first mixture; followed by suction filtration to yield a filter cake, and washing the filter cake with water for 3 times and calcining the filter cake at a temperature of 350 C. for 3 h to yield the magnetic iron oxide red Fe.sub.21.333O.sub.32, which is ground and screened to obtain Fe.sub.21.333O.sub.32 powder of 200 mesh; and

(20) (2) mixing 59 parts by weight of the magnetic iron oxide red Fe.sub.21.333O.sub.32 with 15 parts by weight of anatase-type TiO.sub.2, 8 parts by weight of K.sub.2O, and 5 parts by weight of attapulgite to form a second mixture, followed by roll molding at room temperature to form balls having diameter of 4 to 6 mm, and drying the balls to produce the desulfurizer.

(21) The anatase-type TiO.sub.2 and K.sub.2O in the present example are prepared by calcining a mixture of 18.4 parts by weight of metatitanic acid B of example 1 and 11.7 parts by weight of K.sub.2CO.sub.3 at 500 C.

Example 6

(22) The desulfurizer of the present example comprises magnetic iron oxide red Fe.sub.21.333O.sub.32 in an amount of 59 parts by weight; anatase-type TiO.sub.2 in an amount of 5 parts by weight; K.sub.2O in an amount of 5 parts by weight; and bentonite in an amount of 10 parts by weight.

(23) The method for preparing the desulfurizer for catalytic conversion and absorption of carbonyl sulfide comprises:

(24) (1) putting 500 g of FeSO.sub.4.7H.sub.2O solid into a beaker, adding 454 mL of water into the beaker and putting the beaker into a water bath at 40 C. until the solid therein is completely dissolved to form a FeSO.sub.4 solution, adding 190 g of Na.sub.2CO.sub.3 into the FeSO.sub.4 solution by controlling the alkali ratio of the Na.sub.2CO.sub.3 and FeSO.sub.4 to 1, and reacting for 2 h under stirring to form a first mixture; followed by suction filtration to yield a filter cake, washing the filter cake with water for 3 times and calcining the filter cake at a temperature of 350 C. for 3 h to yield the magnetic iron oxide red Fe.sub.21.333O.sub.32, which is ground and screened to obtain Fe.sub.21.333O.sub.32 powder of 200 mesh; and

(25) (2) mixing 59 parts by weight of the magnetic iron oxide red Fe.sub.21.333O.sub.32 with 5 parts by weight of anatase-type TiO.sub.2, 5 parts by weight of K.sub.2O, and 10 parts by weight of bentonite to form a second mixture, followed by roll molding at room temperature to form balls having diameter of 4 to 6 mm, and drying the balls to produce the desulfurizer.

(26) The anatase-type TiO.sub.2 and K.sub.2O in the present example are prepared by calcining a mixture of 6.4 parts by weight of metatitanic acid A of example 1 and 7.3 parts by weight of K.sub.2CO.sub.3 at 700 C.

Example 7

(27) The Preparation of Anatase Type TiO.sub.2, K.sub.2O and -Al.sub.2O.sub.3

(28) The anatase type TiO.sub.2 and K.sub.2O and -Al.sub.2O.sub.3 are prepared by calcining metatitanic acid A prepared by example 1, K.sub.2CO.sub.3 and pseudo-boehmite at a temperature of 500 C. respectively.

Example 8

(29) The desulfurizer of the present example comprises magnetic iron oxide red Fe.sub.21.333O.sub.32 in an amount of 50 parts by weight; anatase-type TiO.sub.2 in an amount of 5 parts by weight; K.sub.2O in an amount of 2 parts by weight; -Al.sub.2O.sub.3 in an amount of 5 parts by weight; and bentonite in an amount of 5 parts by weight.

(30) The method for preparing the desulfurizer for catalytic conversion and absorption of carbon disulfide comprises:

(31) (1) putting 500 g of FeSO.sub.4.7H.sub.2O solid into a beaker, adding 454 mL of water into the beaker and putting the beaker into a water bath at 40 C. until the solid therein is completely dissolved to form a FeSO.sub.4 solution, adding 190 g of Na.sub.2CO.sub.3 into the FeSO.sub.4 solution by controlling the alkali ratio of the Na.sub.2CO.sub.3 and FeSO.sub.4 to 1, and reacting for 2 h under stirring to form a first mixture; then filtering the first mixture to yield a filter cake, and calcining the filter cake at a temperature of 350 C. for 3 h to yield the magnetic iron oxide red Fe.sub.21.333O.sub.32 which has a XRD pattern as shown in FIG. 1; and

(32) (2) mixing 50 parts by weight of the magnetic iron oxide red Fe.sub.21.333O.sub.32 with 5 parts by weight of anatase-type TiO.sub.2, 2 parts by weight of K.sub.2O, 5 parts by weight of -Al.sub.2O.sub.3, and 5 parts by weight of bentonite to form a second mixture, followed by roll molding at room temperature to form balls having diameter of 4 to 6 mm, and drying the balls to produce the desulfurizer.

(33) The anatase-type TiO.sub.2, K.sub.2O and -Al.sub.2O.sub.3 in the present example are prepared by example 7.

Example 9

(34) The desulfurizer of the present example comprises magnetic iron oxide red Fe.sub.21.333O.sub.32 in an amount of 75 parts by weight; anatase-type TiO.sub.2 in an amount of 15 parts by weight; K.sub.2O in an amount of 8 parts by weight; -Al.sub.2O.sub.3 in an amount of 20 parts by weight; and Yang Gan soil in an amount of 10 parts by weight.

(35) The method for preparing the desulfurizer for catalytic conversion and absorption of carbon disulfide comprises:

(36) (1) mixing 500 g of FeSO.sub.4.7H.sub.2O solid with 333 g of NaHCO.sub.3 solid by controlling the alkali ratio of NaHCO.sub.3 and FeSO.sub.4.7H.sub.2O to 1.1 and kneading them in a coating pan for 2 h to yield a first mixture; followed by washing with water for 3 times and filtering the first mixture to yield a filter cake, and calcining the filter cake at a temperature of 350 C. for 3 h to yield the magnetic iron oxide red Fe.sub.21.333O.sub.32, which is ground and screened to obtain Fe.sub.21.333O.sub.32 powder of 200 mesh; and

(37) (2) mixing 75 parts by weight of the magnetic iron oxide red Fe.sub.21.333O.sub.32 with 15 parts by weight of anatase-type TiO.sub.2, 8 parts by weight of K.sub.2O, 20 parts by weight of -Al.sub.2O.sub.3, and 10 parts by weight of Yang Gan soil to form a second mixture, followed by roll molding at room temperature to form balls having diameter of 4 to 6 mm, and drying the balls to produce the desulfurizer.

(38) The anatase-type TiO.sub.2, K.sub.2O and -Al.sub.2O.sub.3 in the present example are prepared by example 7.

Example 10

(39) The desulfurizer of the present example comprises magnetic iron oxide red Fe.sub.21.333O.sub.32 in an amount of 59 parts by weight; anatase-type TiO.sub.2 in an amount of 15 parts by weight; K.sub.2O in an amount of 8 parts by weight; -Al.sub.2O.sub.3 in an amount of 16 parts by weight; and attapulgite in an amount of 5 parts by weight.

(40) The method for preparing the desulfurizer for catalytic conversion and absorption of carbon disulfide comprises:

(41) (1) putting 500 g of FeSO.sub.4.7H.sub.2O solid into a beaker, adding 454 mL of water into the beaker and putting the beaker into a water bath at 40 C. until the solid therein is completely dissolved to form a FeSO.sub.4 solution, adding 190 g of Na.sub.2CO.sub.3 into the FeSO.sub.4 solution by controlling the alkali ratio of the Na.sub.2CO.sub.3 and FeSO.sub.4 to 1, and reacting for 2 h under stirring to form a first mixture; followed by suction filtration to yield a filter cake, and washing the filter cake with water for 3 times and calcining the filter cake at a temperature of 350 C. for 3 h to yield the magnetic iron oxide red Fe.sub.21.333O.sub.32, which is ground and screened to obtain Fe.sub.21.333O.sub.32 powder of 200 mesh; and

(42) (2) mixing 59 parts by weight of the magnetic iron oxide red Fe.sub.21.333O.sub.32 with 5 parts by weight of anatase-type TiO.sub.2, 8 parts by weight of K.sub.2O, 16 parts by weight of -Al.sub.2O.sub.3 and 5 parts by weight of attapulgite to form a second mixture, followed by roll molding at room temperature to form balls having diameter of 4 to 6 mm, and drying the balls to produce the desulfurizer.

(43) The anatase-type TiO.sub.2, K.sub.2O and -Al.sub.2O.sub.3 in the present example are prepared by calcining a mixture of 6.1 parts by weight of metatitanic acid B of example 1, 11.7 parts by weight of K.sub.2CO.sub.3 and 18.8 parts by weight of pseudo-boehmite at 500 C.

Example 11

(44) The desulfurizer of the present example comprises magnetic iron oxide red Fe.sub.21.333O.sub.32 in an amount of 59 parts by weight; anatase-type TiO.sub.2 in an amount of 5 parts by weight; K.sub.2O in an amount of 2 parts by weight; -Al.sub.2O.sub.3 in an amount of 5 parts by weight; and bentonite in an amount of 10 parts by weight.

(45) The method for preparing the desulfurizer for catalytic conversion and absorption of carbon disulfide comprises:

(46) (1) putting 500 g of FeSO.sub.4.7H.sub.2O solid into a beaker, adding 454 mL of water into the beaker and putting the beaker into a water bath at 40 C. until the solid therein is completely dissolved to form a FeSO.sub.4 solution, adding 190 g of Na.sub.2CO.sub.3 into the FeSO.sub.4 solution by controlling the alkali ratio of the Na.sub.2CO.sub.3 and FeSO.sub.4 to 1, and reacting for 2 h under stirring to form a first mixture; followed by suction filtration to yield a filter cake, and washing the filter cake with water for 3 times and calcining the filter cake at a temperature of 350 C. for 3 h to yield the magnetic iron oxide red Fe.sub.21.333O.sub.32, which is ground and screened to obtain Fe.sub.21.333O.sub.32 powder of 200 mesh; and

(47) (2) mixing 59 parts by weight of the magnetic iron oxide red Fe.sub.21.333O.sub.32 with 5 parts by weight of anatase-type TiO.sub.2, 2 parts by weight of K.sub.2O, 5 parts by weight of -Al.sub.2O.sub.3 and 10 parts by weight of attapulgite to form a second mixture, followed by roll molding at room temperature to form balls having diameter of 4 to 6 mm, and drying the balls to produce the desulfurizer.

(48) The anatase-type TiO.sub.2, K.sub.2O and -Al.sub.2O.sub.3 in the present example are prepared by calcining a mixture of 6.1 parts by weight of metatitanic acid A of example 1, 2.9 parts by weight of K.sub.2CO.sub.3 and 5.9 parts by weight of pseudo-boehmite at 700 C.

(49) The alkaline substance of the present invention for preparing magnetic iron oxide red Fe.sub.21.333O.sub.32 is not limited to the above mentioned Na.sub.2CO.sub.3 or NaOH, and also may be selected from the group consisting of (NH.sub.4).sub.2CO.sub.3, K.sub.2CO.sub.3, NH.sub.4HCO.sub.3, KHCO.sub.3, hydroxides of Group IA except for Na, and any combination thereof. As a preferred embodiment, the anatase-type TiO.sub.2 is prepared using FeSO.sub.4 recycled as a by-product from titanium dioxide production. Alternatively, the anatase-type TiO.sub.2 can also be commercially available industrial grade metatitanic acid.

(50) FIG. 1 shows the XRD pattern of the magnetic iron oxide red Fe.sub.21.333O.sub.32 prepared in the present invention.

Test Example 1

(51) In order to demonstrate technical effect of the desulfurizer for conversion and absorption of carbonyl sulfide, the present invention provides the test example 1, the experiment conditions of which are described as follows.

(52) An evaluation test is performed under normal temperatures and normal pressures by using N.sub.2 as background gas and by using a standard gas containing 3000 ppm (8571 mgS/m.sup.3) of carbonyl sulfide at a space velocity of 500 h.sup.1. The desulfurization exhaust gas is detected by chromatography using WDL-94 trace sulfur analyzer. The test terminates when the outlet gas contains 20 ppm of carbonyl sulfide. The WDL-94 trace sulfur analyzer has a minimal measurement of 0.02 ppm.

(53) {circle around (1)} COS Hydrolysis Conversion Rate
COS hydrolysis conversion rate (%)=(inlet concentration of COSoutlet concentration of COS)/inlet concentration of COS100%

(54) {circle around (2)} H.sub.2S Removal Rate
H.sub.2S removal rate (%)=(inlet concentration of COSoutlet concentration of COSoutlet concentration of H.sub.2S)/(inlet concentration of COSoutlet concentration of COS)100%

(55) {circle around (3)} Sulfur Capacity

(56) Sulfur capacity is calculated when the COS concentration in the outlet gas reaches 20 ppm according to the below formula:

(57) $X=\frac{\frac{V}{1-C}C322}{22.4G}100$

(58) wherein X represents breakthrough sulfur capacity (%); C represents COS content (%) in a gas mixture; V represents volume (L) of gas exclusive of COS measured by a wet gas flow meter after COS is removed; the value 32 is molar mass (g/mol) of sulphur; 22.4 is molar volume (L/mol) of ideal gas under standard condition; G represents the mass (g) of a desulfurizer sample (dry sample).

(59) The results are listed in the following table:

(60) TABLE-US-00001 Outlet COS hydrolysis H.sub.2S removal concentration Sulfur conversion rate rate of COS capacity Example 1 >99.9% >99.9% <0.02 28% Example 2 >99.9% >99.9% <0.02 30% Example 3 >99.9% >99.9% <0.02 33% Example 4 >99.9% >99.9% <0.02 33% Example 5 >99.9% >99.9% <0.02 49% Example 6 >99.9% >99.9% <0.02 51%

Test Example 2

(61) In order to demonstrate technical effect of the desulfurizer for catalytic conversion and absorption of carbon disulfide, the present invention provides the test example 2, the experiment conditions of which are described as follows:

(62) An evaluation test is performed under normal temperatures and normal pressures by using N.sub.2 as background gas and by using a standard gas containing 3000 ppm (8571 mgS/m.sup.3) of CS.sub.2 at a space velocity of 500 h.sup.1. The desulfurization exhaust gas is detected by chromatography using WDL-94 trace sulfur analyzer. The test terminates when the CS.sub.2 concentration in the outlet gas reaches 20 ppm. The WDL-94 trace sulfur analyzer has a minimal measurement of 0.02 ppm.

(63) {circle around (1)} CS.sub.2 Hydrolysis Conversion Rate
CS.sub.2 hydrolysis conversion rate (%)=(inlet concentration of CS.sub.2outlet concentration of CS.sub.2)/inlet concentration of CS.sub.2100%

(64) {circle around (2)} H.sub.2S Removal Rate
H.sub.2S removal rate (%)=(inlet concentration of CS.sub.2outlet concentration of CS.sub.2outlet concentration of COSoutlet concentration of H.sub.2S)/(inlet concentration of CS.sub.2outlet concentration of CS.sub.2outlet concentration of COS)100%

(65) {circle around (3)} Sulfur Capacity

(66) Sulfur capacity is calculated when the CS.sub.2 concentration in the outlet gas reaches 20 ppm according to the below formula:

(67) $X=\frac{\frac{V}{1-C}C322}{22.4G}100$

(68) wherein X represents breakthrough sulfur capacity (%); C represents COS content (%) in a gas mixture; V represents volume (L) of gas exclusive of COS measured by a wet gas flow meter after COS is removed; the value 32 is molar mass (g/mol) of sulphur; 22.4 is molar volume (L/mol) of ideal gas under standard condition; G represents the mass (g) of a desulfurizer sample (dry sample).

(69) The results are listed in the following table:

(70) TABLE-US-00002 Outlet CS.sub.2 hydrolysis H.sub.2S removal concentration Sulfur conversion rate rate of CS.sub.2 capacity Example 1 >99.9% >99.9% <0.02 20% Example 7 >99.9% >99.9% <0.02 19% Example 8 >99.9% >99.9% <0.02 19% Example 9 >99.9% >99.9% <0.02 19% Example 10 >99.9% >99.9% <0.02 36% Example 11 >99.9% >99.9% <0.02 38%

Comparative Example 1

(71) In order to further demonstrate technical effect of the desulfurizer for conversion and absorption of carbonyl sulfide, the present invention provides the comparative example 1 which is described as follows:

(72) Taking 100 g of -Al.sub.2O.sub.3 powder particles as carrier of the desulfurizer, impregnating 10 g of K.sub.2CO.sub.3 on the -Al.sub.2O.sub.3 by using an incipient impregnation method, followed by drying at 120 C. to obtaining the desulfurizer. An evaluation test is performed with the desulfurizer under same conditions of test example 1. The results indicate in the condition of 3000 ppm of CS.sub.2, COS hydrolysis conversion rate is 88%, H.sub.2S removal rate is 92%, and sulfur capacity is 16%.

(73) By comparison it can be seen that, the desulfurizer for conversion and absorption of carbonyl sulfide has a higher COS hydrolysis conversion rate, a higher H.sub.2S removal rate and a higher sulfur capacity when applied in a high-concentration carbonyl sulfide condition.

Comparative Example 2

(74) In order to further demonstrate technical effect of the desulfurizer for catalytic conversion and absorption of carbon disulfide, the present invention provides the comparative example 2 which is described as follows:

(75) Taking 86 g of -Al.sub.2O.sub.3 powder particles as carrier of the desulfurizer, impregnating a mixed solution of 17.44 g of Zr(NO.sub.3).sub.4.5H.sub.2O and 5.32 g of La(NO.sub.3).sub.3.6H.sub.2O on the -Al.sub.2O.sub.3 by using an incipient impregnation method for 2 h, followed by drying for 4 h at 100 C. and calcining for 4 h at 550 C. to obtaining a carrier loaded with Zr and La; then impregnating 10.3 g of K.sub.2CO.sub.3 on the carrier loaded with Zr and La by using an incipient impregnation method for 2 h, followed by drying for 4 h at 100 C. and calcining for 4 h at 550 C. to obtain a material having a composition of 7 wt % K.sub.2O-5 wt % ZrO.sub.2-25 wt % LaO-86 wt % -Al.sub.2O.sub.3, followed by roll molding at room temperature to form balls having diameter of 4 to 6 mm and drying the balls to produce the desulfurizer. An evaluation test is performed with the desulfurizer under same conditions of the test example 2. The results indicate in the condition of 3000 ppm of CS.sub.2, CS.sub.2 hydrolysis conversion rate is 89%, H.sub.2S removal rate is 92%, and sulfur capacity is 16%.

(76) By comparison it can be seen that, the desulfurizer for catalytic conversion and absorption of carbon disulfide has a higher CS.sub.2 hydrolysis conversion rate, a higher H.sub.2S removal rate and a higher sulfur capacity when applied in a high-concentration carbon disulfide condition.

(77) It is obvious the above embodiments are merely examples for clear illustration, rather than limit the application. For those skilled in the art, changes and modifications may be made on the basis of the above description, and it is not necessary and could not exhaust all embodiments, thus obvious changes and modifications derived from the above embodiments still fall within the protection scope of the invention.