The invention relates to a preparation method of a long
carbon chain dibasic acid. C11 and upper
alkane is used as a substrate to produce a corresponding long
carbon chain dibasic acid product through the conversion of the substrate into the long
carbon chain dibasic acid by using a microbial
fermentation method as well as the extraction and the separation of
fermentation liquid and the refining processes of a crude product of dibasic acid. Through technological innovation and
process innovation, the invention researches a new preparation method of the long carbon chain dibasic acid, greatly decreases the production cost of the long carbon chain dibasic acid, improves the yield and the product quality of the long carbon chain dibasic acid, can produce C11 and upper long carbon chain dibasic acid, finally solve the
bottleneck problem restricting the rapid development of the long carbon chain dibasic acid, and form the industrialized scale and the technological predominance. The long carbon chain dibasic acid produced by using the
bioanalysis provided by the invention has the advantages of high acid generation level, low production cost, good product quality, complete variety, and the like, the prepared long carbon chain dibasic acid product has high single
acid content, good
light transmission and high
thermal stability, can meet the requirements of different clients, and can be used for producing high-grade spices, high-
performance engineering plastics, high-temperature
dielectric medium, high-grade hot-melt
adhesive, coldness-resistant
plasticizer, high-grade lubricating oil, high-grade paint,
coating, and the like. The invention greatly widens the development space of the downstream products of the long carbon chain dibasic acid.