Method for producing saccharide solution

Abstract

[Problem] An aqueous saccharide solution obtained from biomass contains various fermentation-inhibiting substances, however, it is possible to easily remove fermentation-inhibiting substances derived from biomass at a low cost by treating the aqueous saccharide solution with microbes that do not utilize glucose or xylose or with a crude enzyme product derived from said microbes.

Description

technical field [0001] The present invention relates to a method for producing sugar liquor from biomass. Background technique [0002] Fermentative production processes of sugar-based chemicals are used in the production of various industrial raw materials. As the sugar used as the raw material for this fermentation, sugar derived from edible raw materials such as sugarcane, starch, and sugar beets is currently used industrially, but from the ethical perspective of the skyrocketing price of edible raw materials caused by the increase in the world population in the future, or competition with food The process of efficiently producing sugar liquid from recycled non-edible resources, that is, cellulose-containing biomass, or the process of efficiently converting the obtained sugar liquid into industrial raw materials is a future issue. [0003] As a method for producing sugar liquid from cellulose-containing biomass, a method of producing sugar liquid by acid hydrolysis of ce...

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Problems solved by technology

[0004] However, in the hydrolysis of cellulose-containing biomass, there is a problem that sugars such as glucose and xylose are decomposed simultaneously with the decomposition of cellulose or hemicellulose components, and furfural, hydroxymethyl, etc. are also produced. Furan compounds such as furfural, or by-products such as organic acids such as formic acid, acetic acid, and levulinic acid

However, in such a method of evaporative removal, there is a problem that the removal efficiency of fermentation inhibitors such as organic acids with low boiling points is low depending on the boiling point of the fermentation inhibitors, and a large amount of energy must be invested in order to obtain sufficient removal efficiency.

[0007] In addition, there is also a method of ion exchange to remove fermentation inhibitors (Patent Document 7), but there is a problem in terms of cost; there is also a method of adsorption removal using woody carbides, that is, activated carbon, etc., but there are cases where the removal object is limited to hydrophobic compounds. Problem (Patent Document 8)

[0008] In addition, a method of using a nanofiltration membrane or a reverse osmosis membrane to remove fermentation inhibitors as the permeate of the membrane is also considered, but there are problems of requiring additional separation equipment and energy input for removal (Patent Document 9)

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