Process for producing bisphenol compound
View Patent ↗Provided is a process for producing a bisphenol compound stably at a high conversion and with high selectivity over a long period. A process for producing a bisphenol compound by feeding a phenol compound and a carbonyl compound continuously to a reactor packed with an acid catalyst, characterized in that the acid catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds.
1. A process for producing a bisphenol compound which comprises:
feeding a phenol compound and a carbonyl compound to a reactor packed with an acidic catalyst to produce the bisphenol compound,
wherein the acidic catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds and that the phenol compound and the carbonyl compound are continuously fed to the reactor packed with the acidic catalyst, and
wherein at least part of the phenol compound is a phenol compound obtained when a bisphenol compound was purified, and wherein the phenol compound comprises phenol and at least one of bisphenol A, 2,4′-bisphenol A and p-isopropylphenol.
2. The process for producing a bisphenol compound as claimed in claim 1 wherein the acidic catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with a 2-pyridylalkanethiol compound.
3. The process for producing a bisphenol compound as claimed in claim 1 wherein the 2-pyridylalkanethiol compound(s) is 2-pyridylethanethiol.
4. The process for producing a bisphenol compound as claimed in claim 3 wherein the 2-pyridylethanethiol is 2-pyridylethanethiol obtained from 2-vinylpyridine and a sulfur-containing compound as starting materials, and the content in the 2-vinylpyridine of 2-vinylpyridine-containing polymers which are the dimer and higher polymers is 2% by weight or less.
5. The process for producing a bisphenol compound as claimed in claim 4 wherein the content in the 2-vinylpyridine of 2-vinylpyridine-containing polymers which are the dimer and higher polymers is 100 weight ppm or higher.
6. The process for producing a bisphenol compound as claimed in claim 4 wherein the sulfur-containing compound is thiourea.
7. The process for producing a bisphenol compound as claimed in claim 3 wherein the 2-pyridylethanethiol is 2-pyridylethanethiol obtained by reacting 2-vinylpyridine with thiourea in the presence of water and a hydrocarbon solvent to obtain an isothiuronium salt and hydrolyzing the isothiuronium salt.
8. The process for producing a bisphenol compound as claimed in claimed 7 wherein the hydrocarbon solvent is toluene.
9. The process for producing a bisphenol compound as claimed in claim 1 wherein the acidic catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with a 3-pyridylalkanethiol compound.
10. The process for producing a bisphenol compound as claimed in claim 1 wherein the 3-pyridylalkanethiol compound(s) is 3-pyridylethanethiol.
11. The process for producing a bisphenol compound as claimed in claim 1 wherein the acidic catalyst is an acidic catalyst obtained through the following steps (I) and (II):
(I) a modification step in which a sulfonic-acid-form cation-exchange resin is modified using a compound obtained by protecting the thiol group of at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds with an acyl group;
(II) a hydrolysis step in which the thioester moiety of the compound obtained by protecting the thiol group of at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds with an acyl group is hydrolyzed at a temperature of 40° C. to 100° C. during the modification and/or after the modification.
12. The process for producing a bisphenol compound as claimed in claim 11 wherein in step (II), the conversion of the compound obtained by protecting the thiol group of at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds with an acyl group is 60% or higher.
13. The process for producing a bisphenol compound as claimed in claim 1 wherein the phenol compound is phenol, the carbonyl compound is acetone, and the bisphenol compound is bisphenol A.
14. The process for producing a bisphenol compound as claimed in claim 2 wherein the 2-pyridylalkanethiol compound(s) is 2-pyridylethanethiol.
15. The process for producing a bisphenol compound as claimed in claim 5 wherein the sulfur-containing compound is thiourea.
16. The process for producing a bisphenol compound as claimed in claim 6 wherein the 2-pyridylethanethiol is 2-pyridylethanethiol obtained by reacting 2-vinylpyridine with thiourea in the presence of water and a hydrocarbon solvent to obtain an isothiuronium salt and hydrolyzing the isothiuronium salt.
17. The process for producing a bisphenol compound as claimed in claim 9 wherein the 3-pyridylalkanethiol compound(s) is 3-pyridylethanethiol.
18. A process for producing a bisphenol compound which comprises:
feeding a phenol compound and a carbonyl compound to a reactor packed with an acidic catalyst to produce the bisphenol compound,
wherein the acidic catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds and that the phenol compound and the carbonyl compound are continuously fed to the reactor packed with the acidic catalyst, and
wherein the phenol compound comprises 2,4′-bisphenol A in an amount of 0.3 parts by weight or more per 100 parts by weight of the phenol, and wherein the phenol compound comprises phenol and at least one of bisphenol A, 2,4′-bisphenol A and p-isopropylphenol.
19. The process for producing a bisphenol compound as claimed in claim 18 wherein the acidic catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with a 2-pyridylalkanethiol compound.
20. The process for producing a bisphenol compound as claimed in claim 18 wherein the 2-pyridylalkanethiol compound(s) is 2-pyridylethanethiol.
21. The process for producing a bisphenol compound as claimed in claim 20 wherein the 2-pyridylethanethiol is 2-pyridylethanethiol obtained from 2-vinylpyridine and a sulfur-containing compound as starting materials, and the content in the 2-vinylpyridine of 2-vinylpyridine-containing polymers which are the dimer and higher polymers is 2% by weight or less.
22. The process for producing a bisphenol compound as claimed in claim 21 wherein the content in the 2-vinylpyridine of 2-vinylpyridine-containing polymers which are the dimer and higher polymers is 100 weight ppm or higher.
23. The process for producing a bisphenol compound as claimed in claim 21 wherein the sulfur-containing compound is thiourea.
24. The process for producing a bisphenol compound as claimed in claim 20 wherein the 2-pyridylethanethiol is 2-pyridylethanethiol obtained by reacting 2-vinylpyridine with thiourea in the presence of water and a hydrocarbon solvent to obtain an isothiuronium salt and hydrolyzing the isothiuronium salt.
25. The process for producing a bisphenol compound claimed in claim 24 wherein the hydrocarbon solvent is toluene.
26. The process for producing a bisphenol compound as claimed in claim 18 wherein the acidic catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with a 3-pyridylalkanethiol compound.
27. The process for producing a bisphenol compound as claimed in claim 18 wherein the 3-pyridylalkanethiol compound(s) is 3-pyridylethanethiol.
28. The process for producing a bisphenol compound as claimed in claim 18 wherein the acidic catalyst is an acidic catalyst obtained through the following steps (I) and (II):
(I) a modification step in which a sulfonic-acid-form cation-exchange resin is modified using a compound obtained by protecting the thiol group of at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds with an acyl group;
(II) a hydrolysis step in which the thioester moiety of the compound obtained by protecting the thiol group of at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds with an acyl group is hydrolyzed at a temperature of 40° C. to 100° C. during the modification and/or after the modification.
29. The process for producing a bisphenol compound as claimed in claim 28 wherein in step (II), the conversion of the compound obtained by protecting the thiol group of at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds with an acyl group is 60% or higher.
30. The process for producing a bisphenol compound as claimed in claim 18 wherein the phenol compound is phenol, the carbonyl compound is acetone, and the bisphenol compound is bisphenol A.
31. The process for producing a bisphenol compound as claimed in claim 18 wherein at least part of the phenol compound is a phenol compound obtained when a bisphenol compound was purified.
32. A process for producing a bisphenol compound which comprises:
feeding a phenol compound and a carbonyl compound to a reactor packed with an acidic catalyst to produce the bisphenol compound,
wherein the acidic catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds and that the phenol compound and the carbonyl compound are continuously fed to the reactor packed with the acidic catalyst, and
wherein the phenol compound comprises p-isopropylphenol in an amount of 0.1 part by weight or more per 100 parts by weight of the phenol compound, and wherein the phenol compound comprises phenol and at least one of bisphenol A, 2,4′-bisphenol A and p-isopropylphenol.
33. The process for producing a bisphenol compound as claimed in claim 32 wherein the acidic catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with a 2-pyridylalkanethiol compound.
34. The process for producing a bisphenol compound as claimed in claim 32 wherein the 2-pyridylalkanethiol compound(s) is 2-pyridylethanethiol.
35. The process for producing a bisphenol compound as claimed in claim 34 wherein the 2-pyridylethanethiol is 2-pyridylethanethiol obtained from 2-vinylpyridine and a sulfur-containing compound as starting materials, and the content in the 2-vinylpyridine of 2-vinylpyridine-containing polymers which are the dimer and higher polymers is 2% by weight or less.
36. The process for producing a bisphenol compound as claimed in claim 35 wherein the content in the 2-vinylpyridine of 2-vinylpyridine-containing polymers which are the dimer and higher polymers is 100 weight ppm or higher.
37. The process for producing a bisphenol compound claimed in claim 35 wherein the sulfur-containing compound is thiourea.
38. The process for producing a bisphenol compound as claimed in claim 34 wherein the 2-pyridylethanethiol is 2-pyridylethanethiol obtained by reacting 2-vinylpyridine with thiourea in the presence of water and a hydrocarbon solvent to obtain an isothiuronium salt and hydrolyzing the isothiuronium salt.
39. The process for producing a bisphenol compound claimed in claim 38 wherein the hydrocarbon solvent is toluene.
40. The process for producing a bisphenol compound as claimed in claim 32 wherein the acidic catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with a 3-pyridylalkanethiol compound.
41. The process for producing a bisphenol compound as claimed in claim 32 wherein the 3-pyridylalkanethiol compound(s) is 3-pyridylethanethiol.
42. The process for producing a bisphenol compound as claimed in claim 32 wherein the acidic catalyst is an acidic catalyst obtained through the following steps (I) and (II):
(I) a modification step in which a sulfonic-acid-form cation-exchange resin is modified using a compound obtained by protecting the thiol group of at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds with an acyl group;
(II) a hydrolysis step in which the thioester moiety of the compound obtained by protecting the thiol group of at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds with an acyl group is hydrolyzed at a temperature of 40° C. to 100° C. during the modification and/or after the modification.
43. The process for producing a bisphenol compound as claimed in claim 42 wherein in step (II), the conversion of the compound obtained by protecting the thiol group of at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds with an acyl group is 60% or higher.
44. The process for producing a bisphenol compound as claimed in claim 32 wherein the phenol compound is phenol, the carbonyl compound is acetone, and the bisphenol compound is bisphenol A.
45. The process for producing a bisphenol compound as claimed in claim 32 wherein at least part of the phenol compound is a phenol compound obtained when a bisphenol compound was purified.