Method for preparing monosaccharide by using raw material containing cellulose

Abstract

The invention discloses a method for preparing monosaccharide by using a raw material containing cellulose, which comprises the steps of subjecting the raw material containing cellulose to steam explosion and mixing an obtained product of the steam explosion with an enzyme for enzymolysis, wherein a method for the steam explosion of the raw material containing cellulose comprises the steps of continuously delivering the raw material containing cellulose to a heat-preservation pressure unit, keeping the raw material containing cellulose in the heat-preservation pressure unit for 3 to 10 minutes first and then releasing part of the raw material containing cellulose in the heat-preservation pressure unit to normal pressure every other 5 to 12 seconds; and a method for mixing the product of the steam explosion and the enzyme comprises the step of mixing part of the product of steam explosion with the enzyme first to obtain a mixture and then continuously adding the rest production of the steam explosion into the mixture for mixing, wherein the rest product of the steam explosion is added at a speed that keeps the concentration of the product of the steam explosion in the reaction system no more than 150g / L and the weight of the part, mixed with the enzyme first, of the product of the steam explosion accounts for 10 to 30 percent of the total weight of the product of the steam explosion. The method can improve the monosaccharide yield effectively.

Description

technical field [0001] The present invention relates to a method for the preparation of sugars, and more particularly to a method for the preparation of monosaccharides from cellulose-containing raw materials. Background technique [0002] The existing technology can use cellulose-containing raw materials to prepare monosaccharides, and the obtained monosaccharides are mainly glucose. Glucose can be used in the food and pharmaceutical industries, and can be used as a reducing agent in the printing and dyeing leather industry. Glucose is often used as a reducing agent in the silver process; the obtained monosaccharides also include xylose, which can be hydrogenated to produce xylitol as a non-caloric sweetener for food. The monosaccharides can also be fermented by microorganisms (such as yeast) to produce ethanol. The cellulose-containing raw materials are generally roots, stems and leaves of plants, including straws. The straw refers to the remaining roots, stems and leave...

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to overcome the disadvantages of low monosaccharide yield and low enzymolysis efficiency of the existing method for preparing monosaccharide from cellulose-containing raw materials, and provide a method with high monosaccharide yield and high enzymolysis efficiency. Method for preparing monosaccharides from cellulose-containing raw materials

The presumed reason may be that due to the large amount of cellulose-containing raw materials put into the steam explosion device in each batch, and the difference in the accumulation mode of each batch of raw materials or the instability of steam explosion conditions, it is impossible to ensure that all the cellulose-containing raw materials The cellulose raw material fully absorbs the water vapor within a few minutes after being steamed, therefore, there will still be most of the cellulose-containing raw materials that cannot be completely exploded by the water vapor inside because they cannot fully absorb the water vapor. As a result, the lignin sheath embedding cellulose and hemicellulose in cellulose-containing raw materials cannot be fully destroyed, reducing the proportion of cellulose in cellulose-containing raw materials that can be contacted with enzymes, thereby reducing the yield of monosaccharides

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