抄録
Conditions for preparation of methyl ricinoleate by methanolysis of castor oil and its acetylation with acetic anhydride to acetyl methyl ricinoleate, an efficient cold-resistant plasticizer, were investigated, and following conclusions were obtained.For methanolysis of 1 mol castor oil, it was necessary to use above 10 mols of methanol, the requirement of NaOH was at least 0.1% of the total weight and using of above 0.2% gave better results.Although the strong alkali, such as Ba (OH) 2, could be replaced for NaOH it could not be substituted by ammonia.The reaction was unfavorable at 15°C but it was satisfactory by heating at above 24°C.The reaction was completed in 30 minutes or more.The acetylation of methyl ricinoleate was completed by boiling for a short time with acetic anhydride in a slight excess and there was only a slight increase in yield by use of acetic anhydride in large excess.It was not necessary to use sulfuric acid as a catalyst in this reaction.
