| abstract |
PROBLEM TO BE SOLVED: To provide a diesel engine fuel having a low acid value and a method for producing high-purity glycerin using animal oil and / or vegetable oil as raw materials. Water and animal oil and / or vegetable oil are hydrolyzed, and alcohol is added to the obtained fatty acid to cause esterification, and water is separated and removed, and then esterified again. The hydrolysis conditions are subcritical conditions of water, and the esterification reaction is supercritical conditions of alcohol. As a result, a fuel for a diesel engine having a low acid value can be produced without using a catalyst, and high-purity glycerin can be recovered. [Selection figure] None |