不飽和脂肪酸の異性化に関する研究 (第6報) : リシノール酸メチルの脱水に伴う二重結合の変化

概要

論文の詳細を見る
Dehydration of ricinoleic acid, a main constituent of castor oil, has long been investigated in order to increase double bond for use as drying oil. The dehydrated products were reported to be a mixture of various isomers, of which only the properties of final products have been majorly investigated. Authors studied the change of double bond structure during dehydration with catalysts by using the ultraviolet and infrared absorption spectrophotometry. The results can be summerized as follows ; 1) The same isomers were found in each sample, but their relative amounts were different by the type of catalyst. 2) Dehydration occurred both at C11-12 and C12-13 position, and it was confirmed that the cis-trans conjugated isomer resulted from the dehydration at C11-12 position, were isomerized at the dehydration temperature to trans-trans conjugated and trans isolated one. 3) The dimer was also formed, as the dehydration proceeded, and was separated by vacuum distillation (0.2mmHg at 141143°C). The diene content of the monomer thus obtained was found to be 2134%. 4) The thermal isomerization of the monomer was carried out and its behaviour was investigated. It was found that the amount of trans-trans conjugated iosmer reached to equilibrium at about 12% of trans isolated isomer in the recovered monomer after the thermal isomerization. The same result had been obtained about pure methyl linoleate in our previous papers.
社団法人日本油化学会の論文