Process for preparing a bisphenol
First Claim
1. A process of preparing a bisphenol comprising the steps of:
- a) reacting a phenolic compound selected from the group consisting of phenol, cresols, xylenols, chlorophenols, thymol, carvacrol, cumenol, 2-methyl-6-ethylphenol, 2,4-dimethyl-3-ethylphenol, 4-ethylphenol, 2-ethyl-4-methylphenol, 2,3,6-trimethylphenol, 2-methyl-4-tertiary-butylphenol, 2,4-ditertiary-butyl-phenol, 4-methyl-2-tertiary-butylphenol, 2-teritary-butyl-4-methylphenol, 2,3,5,6-tetramethylphenol, 2,6-dimethylphenol, 2,6- ditertiary-butylphenol, 3,5-dimethylphenol, 3,5-diethylphenol, 2-methyl-3,5-diethylphenol, o-phenylphenol, p-phenylphenol, tetraphenolethane, the naphthols and phenanthrol with a carbonyl compound having the formula;
##STR3## wherein R1 is selected from the group consisting of aliphatic, cycloaliphatic and aromatic radicals, and R2 is selected from the group consisting of aliphatic, cycloaliphatic, aromatic radicals and hydrogen in a reaction mixture, containing said carbonyl compound, a stoichiometric excess of said phenolic compound and a strongly acidic ion exchange resin catalyst, to produce a product mixture containing a bisphenol;
b) separating bisphenol from the product mixture to leave a motor liquor; and
c) recycling at least a portion of the mother liquor to the reaction mixture,wherein at least one of the following steps is conducted;
i) at least a portion of the phenolic compound is contacted with a strongly acidic cation exchange resin and a strongly basic anion exchange resin before the phenolic compound is used in reaction step a);
ii) at least a portion of the product mixture is contacted with a strongly acidic cation exchange resin and a strongly basic anion exchange resin before mother liquor is recycled to the reaction mixture;
oriii) at least a portion of the mother liquor is contacted with a strongly acidic cation exchange resin and a strongly basic anion exchange resin before mother liquor is recycled to the reaction mixture.
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Abstract
Bisphenols are prepared by
a) reacting a phenolic compound with a carbonyl compound in a reaction mixture, containing the carbonyl compound, a stoichiometric excess of the phenolic compound and a catalyst, to produce a product mixture containing a bisphenol,
b) separating bisphenol from the product mixture to leave a mother liquor and
c) recycling at least a portion of the mother liquor to the reaction mixture.
At least a portion of the phenolic compound is contacted with a strongly acidic cation exchange resin and a strongly basic anion exchange resin before the phenolic compound is used in the reaction step a) and/or at least a portion of the product mixture and/or at least a portion or the mother liquor is contacted with a strongly acidic cation exchange resin and a strongly basic anion exchange resin before mother liquor is recycled to the reaction mixture.
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Citations
19 Claims
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1. A process of preparing a bisphenol comprising the steps of:
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a) reacting a phenolic compound selected from the group consisting of phenol, cresols, xylenols, chlorophenols, thymol, carvacrol, cumenol, 2-methyl-6-ethylphenol, 2,4-dimethyl-3-ethylphenol, 4-ethylphenol, 2-ethyl-4-methylphenol, 2,3,6-trimethylphenol, 2-methyl-4-tertiary-butylphenol, 2,4-ditertiary-butyl-phenol, 4-methyl-2-tertiary-butylphenol, 2-teritary-butyl-4-methylphenol, 2,3,5,6-tetramethylphenol, 2,6-dimethylphenol, 2,6- ditertiary-butylphenol, 3,5-dimethylphenol, 3,5-diethylphenol, 2-methyl-3,5-diethylphenol, o-phenylphenol, p-phenylphenol, tetraphenolethane, the naphthols and phenanthrol with a carbonyl compound having the formula;
##STR3## wherein R1 is selected from the group consisting of aliphatic, cycloaliphatic and aromatic radicals, and R2 is selected from the group consisting of aliphatic, cycloaliphatic, aromatic radicals and hydrogen in a reaction mixture, containing said carbonyl compound, a stoichiometric excess of said phenolic compound and a strongly acidic ion exchange resin catalyst, to produce a product mixture containing a bisphenol;b) separating bisphenol from the product mixture to leave a motor liquor; and c) recycling at least a portion of the mother liquor to the reaction mixture, wherein at least one of the following steps is conducted; i) at least a portion of the phenolic compound is contacted with a strongly acidic cation exchange resin and a strongly basic anion exchange resin before the phenolic compound is used in reaction step a); ii) at least a portion of the product mixture is contacted with a strongly acidic cation exchange resin and a strongly basic anion exchange resin before mother liquor is recycled to the reaction mixture;
oriii) at least a portion of the mother liquor is contacted with a strongly acidic cation exchange resin and a strongly basic anion exchange resin before mother liquor is recycled to the reaction mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification