Preparation of bisphenols salts

Abstract

Preparation of bisphenol double salts are prepared by reacting bisphenol with alkali in organic solvent inorganic aqueous salt solution, and filtering to directly obtain high purity products with yield>90%.

Description

technical field [0001] The invention belongs to the method for preparing di-salt from bisphenol in organic solvent or inorganic salt solution and alkali. Background technique [0002] Polyarylethersulfone, polyetherketone and polyetherimide are currently one of the most widely used heat-resistant polymer materials, especially polyetherimide, which has attracted much attention due to its unique properties and wide application prospects . The traditional method of synthesizing polyarylether ketone and polyarylether sulfone is under the condition of bisphenol and excess alkali, through the method of azeotropic water, in an aprotic polar solvent, such as N-methylpyrrolidone, It can be prepared by polymerizing with dihalogenated monomers. However, the azeotropic water-carrying method is difficult to ensure the complete conversion of bisphenol, and often contains unconverted mono-salt, so the reproducibility of the polymerization reaction is poor, and it is difficult to obtain h...

AI Technical Summary

Problems solved by technology

The direct polymerization of bis-substituted diphthalimide monomers and bisphenols is considered to be the most economical synthetic route, but this method has not yet been industrialized

Wherein the most important reason is exactly that it is difficult to obtain high-purity bisphenol disalt monomer with high yield

In 1997, GE Company disclosed a method for preparing bisphenol disodium salt (US pat, 5,663,275), but its yield was only 50%

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