Process for crystallizing bisphenol-A
First Claim
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1. A process for crystallizing bisphenol-A which comprises:
- a. adding water to a mixture comprising bisphenol-A, about 0.5 to 15 weight percent of diphenol isomers and impurities, said mixture essentially free of phenol, the water in a weight ratio of 1;
1 to 3;
1 based on the weight of the said mixtureb. maintaining the combined water and said mixture of (a) at a temperature sufficient to melt the solid material of step (a),c. adiabatically cooling the water and said mixture to below about 90°
C., andd. separating crystalline bisphenol-A from the mother liquor.
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Abstract
A process for crystallizing bisphenol-A which comprises:
a. adding water to a mixture comprising bisphenol-A, about 0.5 to 15 weight percent of diphenol isomers and impurities, said mixture essentially free of phenol,
b. maintaining the combined water and said mixture of (a) at a temperature sufficient to melt the solid material of step (a),
c. adiabatically cooling the water and said mixture to below about 90° C., and
d. separating crystalline bisphenol-A from the mother liquor.
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Citations
7 Claims
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1. A process for crystallizing bisphenol-A which comprises:
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a. adding water to a mixture comprising bisphenol-A, about 0.5 to 15 weight percent of diphenol isomers and impurities, said mixture essentially free of phenol, the water in a weight ratio of 1;
1 to 3;
1 based on the weight of the said mixtureb. maintaining the combined water and said mixture of (a) at a temperature sufficient to melt the solid material of step (a), c. adiabatically cooling the water and said mixture to below about 90°
C., andd. separating crystalline bisphenol-A from the mother liquor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A process for purifying crystalline bisphenol-A contaminated with isomers of bisphenol-A and other impurities comprising contacting the said bisphenol-A with a mixture comprising phenol, bisphenol-A and water in weight percentages respectively of 0 to 95, 0 to 50, and 5 to 95 and thereafter separating the purified crystalline bisphenol-A from the mixture.
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