Production of bisphenol monoester

Details Production of bisphenol monoester Production of bisphenol monoester

1992-02-12

1993-05-25

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560144, 562493, C07C 6703, C07C 6708, C07C 6714

Patent

active

052141934

ABSTRACT:
A bisphenol monoester represented by the formula (I): ##STR1## wherein R.sup.1 is hydrogen or alkyl, R.sup.2 and R.sup.3 are each alkyl, and R.sup.4 is alkyl, alkenyl or phenyl, is produced by continuous two step reactions in which an aldehyde R.sup.1 -CHO and 2,4-dialkylphenol are subjected to a condensation reaction in a C.sub.6 -C.sub.10 aliphatic or C.sub.6 -C.sub.12 aromatic hydrocarbon solvent, and then a resulting bisphenol compound dissolved in the solvent is subjected to an esterification with a carboxylic acid R.sup.4 --COOH or its derivative. Prior to the esterification, the organic layer containing the bisphenol compound is subjected to a dehydration treatment, thereby enabling the two steps to proceed continuously without isolating the intermediate bisphenol compound. A purification process for the bisphenol monoester of the formula (I) is also disclosed in which the monoester is purified from a mixed solvent comprising a C.sub.6 -C.sub.12 aromatic hydrocarbon solvent and a C.sub.1 -C.sub.8 alcohol or C.sub.2 -C.sub.3 aliphatic nitrile solvent.

REFERENCES:
patent: 3984372 (1976-10-01), Cottman
patent: 4365032 (1982-12-01), Yosizato et al.
patent: 4562281 (1985-12-01), Takahashi et al.
patent: 4774274 (1988-09-01), Takata et al.

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