Preparation method of cellulosic ethanol

Abstract

The invention discloses a preparation method of cellulosic ethanol, which comprises the following steps of pulverizing lignocellulosic biomass, carrying out hydrothermal reaction, cooling to obtain a mixed solution, regulating the pH value, adding cellulase and xylanase, carrying out enzymolysis, inoculating yeast, and fermenting to prepare cellulosic ethanol. According to the method, hydrothermal short-time depolymerization pretreatment is utilized to obtain the low-toxicity pretreatment liquid, and the cellulosic ethanol is prepared by a one-pot method, so that the operation steps are simplified, xylan in the pretreatment liquid is retained, pentose and hexose co-fermentation is realized, the yield of the cellulosic ethanol is remarkably increased, and the method is low in cost, low in energy consumption, free of wastewater discharge and effective sugar components in lignocellulose can be comprehensively utilized.

Description

technical field [0001] The invention relates to the technical field of cellulosic ethanol preparation, in particular to a method for preparing cellulosic ethanol. Background technique [0002] The rapid development of the world economy is inseparable from the use of fossil energy such as coal, oil, natural gas and nuclear fission energy, but it is accompanied by increasingly severe environmental problems, such as the depletion of fossil resources, the global temperature rises year by year, and the ecological environment. getting worse. Recently, the "2020 Energy Technology Outlook Report" issued by the International Energy Agency pointed out that at present, the harmful greenhouse gases emitted by the energy industry account for about 1 / 3 of the world. The platoon task is arduous. The development of renewable energy to continuously promote energy transformation and structural adjustment is the priority choice to deal with the current energy crisis. [0003] As a new type ...

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Problems solved by technology

[0004] However, compared with petroleum and grain cellulosic ethanol, the current market competitive advantage of cellulosic ethanol is not strong, and the cost still restricts its industrial scale development

Since the conversion of lignocellulose into cellulosic ethanol requires pretreatment, enzymolysis, fermentation and other processes, most pretreatment methods have poor biocompatibility, and certain pretreatment of biomass is required before enzymolysis and fermentation, such as the patent CN101787384A discloses a method for coupling enzymatic hydrolysis and saccharification of lignocellulosic raw materials, but this method requires multiple filtrations, washings, dilutions, etc., so the preparation process is not only cumbersome, time-consuming, energy consumption and water consumption are relatively high, there is waste of resources and The problem of difficult disposal of waste and the lack of cost-effective pretreatment technology will inevitably make the cost of cellulosic ethanol production process remain high

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