PROCESS FOR REMOVAL OF VOLATILE COMPOUNDS FROM TACKIFIERS

Abstract

Process for the removal of volatile compounds from a tackifier comprising a resin with repeating units of formula I wherein R.sup.1 is a linear or branched alkylen group with 1 to 10 carbon atoms and R.sup.2 is a linear or branched, saturated or unsaturated N aliphatic hydrocarbon group with up to 20 carbon atoms, and optionally a plasticizer, wherein the tackifier is passed through at least one evaporator as film and the volatile compounds are removed from the film.

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Claims

1-14. (canceled)

16-19. (canceled)

20. A process for removing a volatile compound from a tackifier comprising a resin with repeating units of the following formula I ##STR00006## wherein R.sup.1 is a linear or branched alkylen group with 1 to 10 carbon atoms and R.sup.2 is a linear or branched, saturated or unsaturated aliphatic hydrocarbon group with up to 20 carbon atoms, and optionally a plasticizer, the process comprising passing the tackifier through at least one evaporator as a film and removing the volatile compound from the film.

21. The process of claim 20, wherein R.sup.1 in formula I is CH.sub.2 or HCCH.sub.3 or H.sub.2CCH.sub.2.

22. The process of claim 20, wherein R.sup.2 in formula I is a linear or branched, saturated or unsaturated aliphatic hydrocarbon group with 4 to 10 carbon atoms.

23. The process of claim 20, wherein the resin is obtainable by reacting acetylene and para tertiary butyl phenol.

24. The process of claim 20, wherein the tackifier comprises the plasticizer.

25. The process of claim 20, wherein the plasticizer is a non-aromatic compound comprising at least 50% by weight of one or more linear or branched, saturated or unsaturated aliphatic hydrocarbon groups with at least 4 carbon atoms

26. The process of claim 25, wherein the non-aromatic compound comprises at least 80% by weight of linear or branched, saturated or unsaturated, aliphatic hydrocarbon groups with from 10 to 60 carbon atoms.

27. The process of claim 25, wherein the non-aromatic compound is selected from the group consisting of: linear or branched, saturated or unsaturated aliphatic hydrocarbons; oligomers obtained by reacting unsaturated aliphatic hydrocarbons with unsaturated dicarboxylic acids, dicarboxylic acid anhydrides or dicarboxylic acid amides; saturated or unsaturated fatty alcohols; saturated or unsaturated fatty acids; esters of saturated or unsaturated fatty alcohols with mono-, di-, tri- or tetra carboxylic acids, including saturated or unsaturated fatty acids; esters of saturated or unsaturated fatty acids with alcohols other than saturated or unsaturated fatty alcohols, and saturated or unsaturated fatty acid anhydrides or amides.

28. The process of claim 20, wherein the tackifier comprises 0.1 to 50 parts by weight of the plasticizer per 100 parts by weight of the resin.

29. The process of claim 20, wherein the tackifier comprises at least 80% by weight of the resin and the plasticizer.

30. The process of claim 20, wherein the tackifier has a glass transition temperature of 50 to 120 C.

31. The process of claim 20, wherein the tackifier is passed through an evaporator as a film having a thickness of 0.01 to 20 mm.

32. The process of claim 20, wherein a temperature of the tackifier is at least 150 C.

33. The process of claim 20, wherein a temperature of the tackifier is 190 to 220 C.

34. The process of claim 20, wherein the at least one evaporator is a falling film evaporator.

35. The process of claim 20, wherein the process is a multistage process, employing more than one evaporator in serial.

36. The process of claim 20, wherein the process is a two-stage process wherein the tackifier is fed to a first evaporator and then passed in a molten stage to a second evaporator.

37. The process of claim 20, wherein an average residence time of the tackifier in the at least one evaporator is in total from 1 to 30 minutes.

Description

EXAMPLES

[0116] All stated percentages are by weight.

[0117] Koresin of BASF has been used as resin.

[0118] Stearyl alcohol has been used as plasticizer.

[0119] Mixtures of Koresin and stearyl alcohol have been prepared as described in patent application PCT/EP2017/081051.

Example 1: Falling-Film Evaporator

[0120] A falling-film evaporator with wipers was used as thin-film reactor. The falling-film reactor had a heating surface area of 0.08 m.sup.2 and was continuously charged with a feed flow of 987 g/h with Koresin, 0.85% 4-tert-Butylphenol (TBP), 2.5% stearyl alcohol. The feed temperature amounted to 180 C. The evaporator was heated with Marlotherm with the heating temperature of 208 C. The distillation pressure amounted to 10 mbar. 144 g/h was withdrawn as a distillate. The residue amounted to 843 g/h with 0.16% TBP.

Example 2: Two-Stage Evaporation

[0121] A falling-film evaporator with wipers having a heating surface area of 0.04 m.sup.2 was continuously charged with a feed flow of 367 g/h with Koresin, 0.80% TBP, 10% stearyl alcohol. The feed temperature amounted to 165 C. The falling-film evaporator was heated with Marlotherm with a heating temperature of 200 C. The distillation pressure amounted to 10 mbar. 10 g/h was withdrawn as a distillate.

[0122] The residue was continuously passed to a short path evaporator as second thin-film evaporator having a heating surface area of 0.04 m.sup.2.

[0123] The feed temperature amounted to 180 C. The short path evaporator was heated with Marlotherm with the heating temperature of 200 C. The pressure amounted to 10 mbar. 57 g/h was withdrawn as a distillate. The residue amounted to 299 kg/h with 0.067% TBP.

Examples 3 to 10

[0124] Example 2 has been repeated. The feed temperature for falling-film and short path evaporator were the same as for example 2. Other parameters have been varied as is listed in the table.

[0125] The obtained residue of tertiary butyl phenol is found in the last column of the table.

[0126] Table: examples 2 to 10 with two-stage evaporation

TABLE-US-00001 temperature pressure mass flow concentration heating oil heating oil thin- short distillate distillate residue feed thin-film short pass film pass thin-film short pass short pass Stearyl residue evaporator evaporator evaporator evaporator feed evaporator evaporator evaporator Koresin alcohol TBP TBP No. [ C.] [ C.] [mbar] [mbar] [g/h [g/h] [g/h] [g/h] [%] [%] [%] [%] 2 200 200 10 2.2 367 10 57 299 89.2 10.0 0.8 0.067 3 200 200 10 4.9 416 11 46 359 89.2 10.0 0.8 0.06 4 200 200 10 10 459 11 42 405 89.2 10.0 0.8 0.055 5 200 210 10 10 413 11 47 355 89.2 10.0 0.8 0.085 6 200 210 10 10 383 13 32 338 94.2 5.0 0.8 0.075 7 200 220 10 10 388 13 34 341 94.2 5.0 0.8 0.087 8 200 230 10 10 383 13 38 333 94.2 5.0 0.8 0.12 9 200 240 10 10 376 12 41 322 94.2 5.0 0.8 0.15 10 200 200 10 10 364 11 19 335 96.7 2.5 0.8 0.062
The examples show very good results regarding the residual TBP, best results are achieved with examples 2 to 7 and 10 with a temperature of the tackifier of 200. respectively 210 and 220 C.