PROCESS FOR PRODUCING LOW VOC COALESCING AIDS

摘要

A process comprising reacting a mono- or di-carboxylic acid and/or acid anhydride with a glycol ether in the presence of phosphoric acid to produce a glycol ether ester product having low color and low VOC content.

主权项

1. A process for the preparation of a glycol ether ester, the process comprising contacting in a reaction zone a mono- or di-carboxylic acid and/or acid anhydride with a glycol ether in the presence of a catalytic amount of phosphoric acid under reaction conditions sufficient to produce a reaction product mixture comprising a glycol ether ester product and water, wherein the water is at least partially vaporized in the reaction zone and is passed to a separation zone where the water is substantially removed from the process, and wherein the process is operated under conditions of temperature and pressure such that essentially no glycol ether leaves the separation zone, other than as a component of an azeotrope.