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System and method of producing bisphenol-A (BPA)

  • US 6,960,697 B2
  • Filed: 03/13/2002
  • Issued: 11/01/2005
  • Est. Priority Date: 03/13/2002
  • Status: Expired due to Fees
First Claim
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1. A method for producing bisphenol-A by crystallization from a product solution comprising the following steps:

  • forming a product solution comprised of phenol, bisphenol-A, isomers of bisphenol-A, un-reacted reactants, and a solvent comprised of two or more solvent components, selectively controlling the amount of said solvent in the product solution to manipulate a phase behavior of the product solution such that a maximum amount of substantially pure crystalline bisphenol-A will be crystallized from said product solution before a solid adduct of bisphenol A and phenol appears, where the total weight percent of said solvents prior to crystallization is at or below about 40%, and separating substantially pure bisphenol-A, where the final separation of substantially pure bisphenol-A is achieved by direct crystallization.

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