Armstrong, Nikaido & Wegner
Method of manufacturing alkylene oxide adducts of an aliphatic alcohol
 An improvement is provided in the manufacture of alkylene oxide adducts of an aliphatic alcohol in which the reaction mixture, comprising the alkylene oxide adduct, unreacted alcohol, acid catalyst residue, carbonyl compounds and hydrocarbons, is treated to remove unreacted alcohol for recycle to the adduct formation step. To prevent the build-up in the system of carbonyl compounds and hydrocarbons which are not easily distillable from the recycle alcohol because of their respective boiling points, at least a portion of the recycle alcohol is esterified with boric acid, the esterification mixture is subjected to distillation to remove volatile portions, and the borate ester thus obtained is hydrolyzed to recover the alcohol which is recycled to the adduct formation step. 
Nippon Shokubai Kaguku Kogyo Co., Ltd.
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C07C C07F C08G C08G
inventional inventional inventional inventional
Yukio Koichi Naoji Kazuo Toshihiro
Okuda Matsushiro Kurata Koshida Fujii