Method of extracting butyric acid from a fermented liquid and chemically converting butyric acid into biofuel

摘要

The invention relates to a method of converting butyric acid contained in a fermented liquid of carbohydrates into biofuel.  More specifically, the invention relates to a chemical conversion method comprising: isolating biohydrogen from gas generated in the production of butyric acid through carbohydrate fermentation and extracting butyric acid in the fermented liquid by using an insoluble solvent; producing butylbutyrate from the butyric acid by esterification; hydrocracking all or a part of the produced butylbutyrate to yield butanol.  Advantages of the invention lie in the facts that biobutanol can be produced in an economical and efficient manner and that the produced biobutanol has oxidation stability outweighing that of conventional biodiesel (fatty acid methyl esters), so butylbutyrate of a great value as novel biofuel may be produced together.