Process for separating sugar and acid by using quasi-two-dimensional chromatography

Abstract

The invention discloses a process for separating sugar and acid by using quasi-two-dimensional chromatography. A quasi-two-dimensional chromatography system comprises a first-dimensional chromatographic column containing H-type cation exchange resin and a second-dimensional chromatographic column containing weak-polarity adsorption resin; the process comprises the following steps: S1, removing inorganic acid and part of sugar in a mixed solution containing sugar and acid through a first-dimensional chromatographic column; s2, transferring the residual sugar and organic acid in the first-position chromatographic column into a second-position chromatographic column; and removing the residual sugar and organic acid through a second-dimensional chromatographic column. The invention provides a novel quasi-two-dimensional chromatography method by combining two resins with different separation characteristics on a sugar acid mixture and combining a two-dimensional chromatography design thought. According to the technical scheme, the recovery rates of sulfuric acid, xylose and acetic acid can be 100%, 99.6% and 100% respectively, the mass purity of xylose is 99.9%, and 42% of washing water is recovered.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a technology for separating sugar and acid by quasi-two-dimensional chromatography. Background technique [0002] As the reserves of fossil resources are decreasing year by year, the climate and environmental problems caused by the consumption of fossil resources are increasing year by year. In order to solve the contradiction between climate, environment and economic and social development, it is necessary to break the constraints of fossil resource reserves and fully develop and utilize other abundant and renewable resources. The second-generation biotransformation technology has gradually attracted more and more researchers' attention, because its raw materials are agricultural and forestry waste biomass resources such as corn stalks, wheat stalks, corncobs, etc. They are widely available, abundant in yield, and renewable. , and does not form land competition with...

AI Technical Summary

Problems solved by technology

The advantage of electrodialysis technology is that it can realize the separation of sugar and inorganic acid without diluting the acid catalyst, but the disadvantage of electrodialysis: the membrane is easily polluted, for example, when separating lignocellulose hydrolyzate, a pre-step (such as ultra Membrane treatment) to remove any macromolecules that may precipitate and contaminate or clog the membrane at higher pH conditions, which also has some problems of sugar loss and high energy consumption

But its disadvantage is that sugar is the intermediate retained component, its recovery rate and purity are restricted by sulfuric acid and organic acid before and after, and the separation degree of organic acid (such as acetic acid, formic acid) and sugar component is poor by existing ion exclusion chromatography technology As a result, the recovery and purity of sugar cannot be guaranteed at the same time

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