Steam Infiltration Technology for Biomass Fuel Ethanol In-situ Fermentation
The research project of the in-situ fermentation-separation process of biomass fuel ethanol using steam infiltration technology undertaken by the Jilin Petrochemical Research Institute and Beijing University of Chemical Technology has passed the acceptance of experts from the China Petroleum Technology Management Department. This marks another solid step forward in the key technologies for non-food ethanol fuel in China.
Ethanol fermentation-vapor-osmotic coupled pilot plant evaluation using the results of the project showed that the concentration of ethanol in the permeate was 340-480 g/l, and the ethanol concentration in the fermentation broth was kept at 54-66 g/l, which was higher than under the same conditions. During the fermentation, the ethanol yield increased by 67%, the separation performance was stable, and the effect was significant. All the indicators met the requirements.
According to the project leader Hui Jixing, the project team proposed for the first time a method of using steam infiltration technology to separate ethanol in situ, which can solve the problem of product inhibition, and increase fermentation intensity and ethanol yield. "Coupling bioethanol fermentation process with steam infiltration technology, using a separation membrane with high selectivity and high permeation capacity for ethanol, utilizing the principle of vapor-liquid phase equilibrium, the ethanol in the gas phase is continuously and selectively removed to achieve a reduction The aim of the ethanol concentration in the fermentation broth is to achieve the in-situ separation of ethanol in the fermentation process, which can effectively eliminate the feedback inhibition effect of ethanol on the fermentation process, increase the fermentation intensity and ethanol yield, and not only increase the yield by more than 30%, but also shorten the Fermentation cycle reduces production costs."
It is understood that ethanol fermentation is a typical product inhibition process, excessive accumulation of ethanol in the fermentation broth will inhibit the growth of yeast cells, and ultimately lead to the termination of fermentation. Using steam infiltration technology to achieve a separation process of in situ fermentation of biomass fuel ethanol is an important issue for key technologies of non-food fuel ethanol. The project team conducted a large number of tests during the research, developed and screened the preferred trans-alcohol separation membrane suitable for the pilot test. After optimization of the operating conditions of the separation membrane, the separation effect was stable. On this basis, the researchers of the hospital completed the evaluation of ethanol fermentation-vapor-osmotic coupling pilot plant.
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