Patent ID: 9580378
Date: 2017-02-28
CPC Classifications: C07C

Claim:
1. A batchwise process for aftertreatment of polyol esters prepared by reacting polyols of the general formula (II) in which R 1 and R 2 are each independently selected from the group consisting of hydrogen, an alkyl radical having 1 to 5 carbon atoms or a hydroxyalkyl radical having 1 to 5 carbon atoms, m is an integer from 1 to 10, o is an integer from 2 to 15, with excess of linear or branched aliphatic monocarboxylic acids having 3 to 20 carbon atoms and having a lower boiling point than the polyols used, in the presence of a Lewis acid selected from the group consisting of titanium, zirconium, hafnium, iron, zinc, boron, aluminum and tin as elements or in the form of compounds thereof as catalyst and in the presence of an adsorbent in an amount of 0.1 to 5 parts by weight per 100 parts by weight of a reaction mixture, while removing the water formed, characterized in that the excess monocarboxylic acid is removed by distillation and water is added to the crude ester obtained at a temperature below the boiling point of water at the particular pressure and the crude ester with added water is aftertreated with avoidance of basic compounds, and the sparingly soluble conversion products and the adsorbent present in the esterification reaction are filtered off.