Method for producing pure sugar solution, and method for producing chemical product

Abstract

Provided is a method for removing, during a step for producing a sugar solution, a fermentation inhibiting substance, which is generated during a step for producing sugar from a cellulose-containing biomass. Also provided is a method for steadily generating a pure sugar solution, which has an extremely low content of a fermentation inhibiting substance, over a long period of time. Specifically, disclosed is a method for producing a pure sugar solution, which uses a cellulose-containing biomass as the starting material and which involves: a step (1) for producing a sugar solution by subjecting a cellulose-containing biomass to decomposition treatment; a step (2) for subjecting the sugar solution obtained in step (1) to coagulation treatment; a step (3) for filtering the sugar solution obtained in step (2) by means of a microfiltration membrane and / or an ultra-filtration membrane, and for collecting the sugar solution from the permeate side; and a step (4) for filtering the sugar solution obtained in step (3) by means of a nano-filtration membrane and / or a reverse osmosis membrane, for collecting the pure sugar solution from the non-permeate side, and for removing a fermentation inhibiting substance from the permeate side.

Description

technical field [0001] The present invention relates to a process for the production of aqueous refined sugar solutions from cellulose-containing biomass. Background technique [0002] The 20th century of mass consumption and mass waste has come to an end. In the 21st century, which seeks to build an environment-friendly society, the depletion of fossil resources and the deepening of global warming are expected to promote biomass resources as a recycling resource. effective use. [0003] At present, countries such as the United States and Brazil are actively using sugarcane and corn as raw materials to produce bioethanol from biomass resources. This is because sugar cane and corn are rich in sucrose and starch, and it is easy to prepare and ferment an aqueous sugar solution from them. However, since sugarcane and corn are foods themselves, when they are used as raw materials, there is a serious problem that they will compete with food or feed, and the price of raw material...

AI Technical Summary

Problems solved by technology

[0006] However, there is a problem that when cellulose-containing biomass is hydrolyzed, while the cellulose or hemicellulose components, etc. By-products such as furan compounds such as methylfurfural (HMF) or organic acids such as formic acid, acetic acid, and levulinic acid

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

[0009] In addition, there is also a method of removing fermentation inhibitors by ion exchange (Patent Document 7), but there is a problem in terms of cost

There is also a method of adsorption and removal using wood-based charcoal (i.e., activated carbon) and the like (Patent Document 8), but there is a problem that the removal target is limited to hydrophobic compounds

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