Process for purifying bisphenol-a
AssigneeDow Global Technologies LLC
InventorsThomas C. Young, Damian M. Feord, Johann-Wilhelm Frey
Life of this patent
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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.
Claims19
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.
Dependencies are inferred from the claim text.