The invention discloses a method for producing long-chain
binary acid through
fermentation separation
coupling, in particular to a method of high-yield
dodecanedioic acid (DC12). According to the technical scheme, the method includes the steps that candida viswanathii is cultivated into a seed solution which is led into 5-40% (v / v) n-
alkane and 60-95% (v / v) liquid
fermentation medium mixture, wherein the pH of the n-
alkane ranges from 5.0 to 8.5, and 10 to 18 carbon atoms are contained in the n-
alkane; a saccharic multielement substrate serves as a growth
carbon source of the liquid
fermentation medium mixture; mixing liquid is cultivated for 42 h to 194 h under the conditions that the temperature ranges from 24 DEG C to 40 DEG C, and the air passing amount ranges from 0.1 vvm to 3.0 vvm, a centrifugal fermentation separation
coupling device or a plate frame filtering fermentation separation
coupling device is started, cells passing through the separation coupling device are circulated back to a fermentation cylinder, and
clear liquid passing through the separation coupling device enters an extraction link to prepare long-chain
binary acid; and meanwhile the fermentation process is continuously carried out on a cultivation medium in a fermentation tank. The method is used for converting n-
dodecane so as to produce the DC12, the produced acid reaches 240 g / L, and the
acid production rate is larger than 1.5 g / h.L.