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1. WO2018011700 - MANUFACTURE OF BISPHENOL A

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[ EN ]

Claims

1. A method for the manufacture of bisphenol A, comprising:

a) reacting phenol and acetone in the presence of an acidic catalyst to form a reaction product comprising bisphenol A; and

b) crystallising a bisphenol A/phenol adduct from said reaction product, wherein said crystallisation is carried out in the presence of an acid, wherein total amount of acid present during the crystallisation step is 5 % or less by total weight of the reaction product.

2. The method of Claim 1, wherein total amount of acid present during the crystallisation step is 4 % or less by total weight of the reaction product, preferably 3 % or less.

3. The method of any of the preceding claims, wherein the amount of water during the reaction of step a) is 5 % or less by total weight of the reaction mixture.

4. The method of any of the preceding claims, wherein the amount of water during the crystallisation of step b) is 5 % or less by total weight of the reaction mixture.

5. The method of any of the preceding claims, wherein said acid comprises inorganic acid, preferably one or more selected from the group consisting of hydrochloric acid, phosphoric acid, and nitric acid.

6. The method of any of the preceding claims, wherein said acid comprises organic acid, preferably organic acid having a pKa of at most 3.3.

7. The method of any of the preceding claims, wherein said acid comprises inorganic acid, and wherein the amount of inorganic acid is 1 % or less by total weight of the reaction product, preferably 0.5 % or less, more preferably 0.3 % or less.

8. The method of any of the preceding claims, wherein said acid comprises organic acid, and wherein the amount of organic acid is 0.5-5 % by total weight of the reaction product.

9. The method of any of the preceding claims, wherein the acid is added to the reaction product after step a), but before cooling the reaction product.

10. The method of any of the preceding claims, wherein the product mixture comprises:

10-50 % by total weight of the reaction product of bisphenol A, preferably

15-40 %;

60-85 % by total weight of the reaction product of phenol;

0-5 % by total weight of the reaction product of water, preferably 0-3 %;

0-8 % by total weight of the reaction product of acetone, preferably 0-5 %; and

0-20 % by total weight of the reaction product of by-products, preferably 2- 16 %.

11. The method of any of the preceding claims, wherein the manufactured bisphenol A has a purity of 99.70 % or more on phenol free basis, preferably 99.80 % or more, more preferably 99.90 % or more.

12. The method of any of the preceding claims, wherein the crystallisation is carried out in a single step.

13. The method of any of the preceding claims, wherein the crystallisation is carried out in two or more steps in series.

14. Use of acid, preferably an acid as defined in Claim 5 or 6, in a method for crystallising a bisphenol A/phenol adduct from a mixture comprising:

10-50 % by total weight of the mixture of bisphenol A, preferably 15-40 %;

60-85 % by total weight of the mixture of phenol;

0-5 % by total weight of the mixture of water, preferably 0-3 %;

0-8 % by total weight of the mixture of acetone, preferably 0-5 %; and

0-20 % by total weight of the mixture of impurities, preferably 2-16 %.

15. Bisphenol A/phenol adduct crystals obtainable by the method according to any of Claims 1-13, wherein said bisphenol A has a purity of at least 99.80 % on phenol free basis, and wherein the crystallisation is preferably carried out in a single step.