Alternative methods for dehydrating castor oil

Abstract

Summary Castor oil can be effectively dehydrated by non‐conjugated oil‐maleic anhydride adducts to give use‐ful paint or yarnish oils. Castor acids dehydrated in the presence of alumina form diene acids of 60% two double bond conjugation. The glyceride from these acids dries more rapidly to a tack‐free film than conventional dehydrated castor oil. In both of these processes the course of dehydration is believed to be the decomposition of esters of the alcohol groups in ricinoleic acid. Acidic ion exchange resins exert some catalytic effect in the dehydration of castor oil, but the oil so made is inferior in color and film properties.

Castor oil as a renewable resource for the chemical industry

“…However, it can be dehydrated to give semi-drying or drying oils. The dehydration process is usually carried out at about 250 7C in the presence of catalysts under an inert atmosphere or vacuum [40][41][42][43][44][45][46]. Many catalysts are reported for the dehydration of castor oil, the most widely used being sulfuric acid, sodium bisulfate, phosphoric acid, phthalic anhydride and acid-activated clays [42][43][44][45][46][47].…”

Castor Oil: Properties, Uses, and Optimization of Processing Parameters in Commercial Production

“…4 ). 63 Trevino and Trumbo 64 studied the utilization of castor oil as a coating application by converting the hydroxyl functionalities of castor oil to β-ketoesters using t -butyl acetoacetate. The reaction is known to be relatively rapid and proceeded to high yield under mild conditions.…”

Ion Exchange

“…Weinstock (201) used exchangers in Hofmann degradation studies. Crotonization reactions were studied by LaGrange (91), and Durr (51,61) and dehydration reactions were reported by Mastagli (101,141) and Grummett (81). Various condensation reactions were catalyzed by ion exchange substances (II, 71, .…”