Process for purifying bisphenol-a
First Claim
1. A process for purifying bisphenol-A comprising the steps of a) cooling a liquid mixture comprising bisphenol-A and water in a bisphenol-A crystallizer to form bisphenol-A crystals in a liquid phase;
- b) separating the bisphenol-A crystals from the liquid phase;
c) dividing at least a portion of the liquid phase into a bisphenol-rich organic phase and a water-rich phase;
d) feeding phenol and at least a portion of the bisphenol-rich organic phase into an adduct crystallizer to form a crystalline adduct of phenol and bisphenol-A in a mother liquor; and
e) separating the crystalline adduct from the mother liquor.
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Accused Products
Abstract
Bisphenol-A is purified in a process which comprises the following steps: a) cooling a liquid mixture comprising bisphenol-A and water in a bisphenol-A crystallizer to form bisphenol-A crystals in a liquid phase; b) separating the bisphenol-A crystals from the liquid phase; c) dividing at least a portion of the liquid phase into a bisphenol-rich organic phase and a water-rich phase; d) feeding phenol and at least a portion of the bisphenol-rich organic phase into a adduct crystallizer to form a crystalline adduct of phenol and bisphenol-A in a mother liquor, and e) separating the crystalline adduct from the mother liquor. Bisphenol-A of high purity at a high yield is obtained.
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Citations
20 Claims
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1. A process for purifying bisphenol-A comprising the steps of
a) cooling a liquid mixture comprising bisphenol-A and water in a bisphenol-A crystallizer to form bisphenol-A crystals in a liquid phase; -
b) separating the bisphenol-A crystals from the liquid phase;
c) dividing at least a portion of the liquid phase into a bisphenol-rich organic phase and a water-rich phase;
d) feeding phenol and at least a portion of the bisphenol-rich organic phase into an adduct crystallizer to form a crystalline adduct of phenol and bisphenol-A in a mother liquor; and
e) separating the crystalline adduct from the mother liquor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20)
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15. (canceled)
Specification