Fermentation and infiltration vaporization coupling technique for producing ethanol

Abstract

The invention belongs to a separation technique of fermentation and pervaporation coupling to produce alcohol, which is characterized in that the separating technique comprises separating solid suspension mater and liquid part in a fermentation tank, transporting liquid part to a pervaporation steaming film separator through a pump, and lowering clogging at the bottom of the fermentation tank through the circulation of permeation residual liquid. The improved fermentation technique is more suitable for the connection of pervaporation technique, which increases the matching degree between fermentation and pervaporation coupling, and leads the integral production technique in downstream pervaporation technique to be more stable. The separation technique not only lowers the possibility of infecting bacteria through a new process flow, but also lowers film pollution in the process of downstream pervaporation separation, which lays an industrial foundation for the process of improving fermentation productivity and continuously fermenting. The distinctive characteristics of the method are that the method has low production cost and convenient employment, which has industrialized prospect.

Description

technical field [0001] The invention relates to a production method for producing fuel ethanol by fermentation of biomass, in particular to the transformation of a pretreatment process in which the fermentation process is coupled with pervaporation to produce ethanol, and belongs to the field of fuel ethanol preparation. Background technique [0002] Biomass fermentation to prepare fuel ethanol has attracted the attention of countries all over the world, especially the use of cellulose (such as crop straw) as a fermented product to ferment fuel ethanol is an inevitable trend in the development of fuel ethanol, so the development of fuel ethanol through cellulose fermentation The technical route has become a hot topic of widespread concern to scientists from all over the world. The large accumulation of metabolites (ethanol) in the fermentation process has a greater feedback inhibition effect on the fermentation process, which will seriously affect the yield of ethanol. In r...

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Problems solved by technology

[0003] The cellulose fermentation system contains 15% to 40% solids (unfermentable lignin), which will cause serious pollution to the downstream pervaporation separation process. In previous reports, the biofermentation reactor The reactants must be pretreated by microfiltration before they can enter the pervaporation separation process. Such a process not only has high operating costs and is unacceptable to the industry, but also increases the possibility of bacterial contamination, which will affect the further metabolism of the bacteria. It also increases the mortality rate of the yeast, resulting in a decrease in the fermentation rate, and it will also be accompanied by a serious accumulation of inhibitors, resulting in an unstable fermentation process

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