A method for fractional separation of full components of agricultural and forestry cellulose biomass and preparation of fuel alcohol and xylooligosaccharides by using the separated components

Abstract

The invention discloses grading and separating of all components of forestry cellulose biomass and preparing of fuel alcohol and xylo-oligosaccharide by utilizing the separated components. The method comprises the following steps of: (a) crushing, immersing and filter pressing dry substances of the forestry cellulose biomass; (b) immersing the filter pressed solid phase part using an alkaline solution, adding an oxidizing agent, extracting and solidifying phase to form a cellulose crude product; (c) concentrating pressure filtrate through a nano-filtration membrane, adding alcohol with the final concentration of above 50% to the concentrated solution, filtering or centrifugally separating after standing to obtain precipitate and supernatant, wherein the precipitate is a hemi-cellulose crude product; and (d) adjusting the supernatant obtained in the step (c) to be acid, and filtering, separating and precipitating to obtain a lignin crude product. According to the method disclosed by the invention, the resource utilization is maximized; the independence on imported oil in our country can be reduced; the environment pollution is reduced; establishment of a new energy industry and a biological chemical industry can also be promoted; the economic growth pattern in our country is changed; and social and economic sustainable development can be realized.

Description

technical field [0001] The invention relates to a method for fractionating and separating the whole components of agricultural and forestry cellulose biomass and using the separated components to prepare fuel alcohol and xylooligosaccharides. Background technique [0002] Natural lignocellulose is the most abundant renewable resource on the earth. Cellulosic biomass mainly includes cellulose, hemicellulose and lignin, and the three are closely combined in a certain proportion. Cellulose is a linear high polysaccharide formed by many glucose molecules connected by 3-1,4-glycosidic bonds. After pretreatment, the degree of polymerization will decrease, and after complete hydrolysis, six-carbon sugars such as glucose can be obtained, and then processed by Saccharomyces cerevisiae Fermentation to produce fuel alcohol; hemicellulose is a general term for polysaccharides with branched chains, and its structural units include pentosyl, hexosyl, sugar acid and hexylphthalein, of whic...

AI Technical Summary

Problems solved by technology

In the process of using cellulosic biomass to produce alcohol, chemical and biological methods are often used to degrade cellulosic biomass. The products include various mixed sugars such as glucose and xylose, and the mixed sugars are used for fermentation to produce alcohol. The obtained product is single, its added value is not high, its economic benefit is low, and it lacks market competitiveness; in the process of using cellulose biomass to produce xylo-oligosaccharides, one-step alkali extraction is usually used, and then directly in the extract Add acid to neutralize and add alcohol to precipitate hemicellulose. The disadvantage of this method is that the extraction rate of hemicellulose is low, the amount of alkali is large, the amount of acid is large during neutralization, and the amount of alcohol is large when hemicellulose is precipitated. Due to the use of traditional technology in the process, the separation effect is poor, the energy consumption is large, and the cost is high

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