Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1984-10-03
1985-10-15
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
560 67, 560 75, C07C 6976
Patent
active
045475830
ABSTRACT:
Carboxylic acids containing phenol groups are esterified by means of (C.sub.1 -C.sub.3)-alcohols in the presence of acid catalysts without the phenolic hydroxyl groups being esterified at the same time by continuously metering an excess of a water-containing (C.sub.1 -C.sub.3)-alcohol into a boiling hot solution or suspension of the phenol-containing carboxylic acid and of the catalyst in a non-water-miscible solvent (for example xylene) and at the same time distilling off a ternary solvent/alcohol/water mixture via a water separator, the metering rate being such that an aqueous bottom phase separates out in the receiving flask and the water content of the alcohol being so apportioned as not to breach the bottom limit of 0.1% or the upper limit of 1% (based on the contents of the reaction vessel) at any time in the course of the reaction. In this process, the esterification products are obtained free of major impurities and frequently can be used further without further purification.
REFERENCES:
patent: 3247240 (1966-04-01), Meier et al.
patent: 4001299 (1977-01-01), Dexter et al.
patent: 4228297 (1980-10-01), Haeberli et al.
Hoechst Aktiengesellschaft
Killos Paul J.
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