Electrodialysis method for separating sugar and acid in biomass hydrolysate

Abstract

The method for separating sugar and acid from biomass hydrolysate includes the following steps: placing the pretreated biomass hydrolysate into double-chamber bipolar membrane electrodialyzer equipment, under the condition of that the operation pressure is 20V-50V making sugar and acid separation and recovery of acid, separating time is 120-468 min. the loss rate of sugar is 2.3-3.8% and the percent recovery of acid is greater than 98%. At the same time, it can recover and reuse inorganic and organic acids in the hydrolysate, and can raise the quality concentration of sugar in the hydrolysate.

Description

technical field [0001] The invention relates to a method for separating sugar and acid in biomass hydrolyzate. Background technique [0002] Biomass is the largest renewable resource on the earth, and its utilization has a huge impact on the sustainable development of human society. Biomass refers to terrestrial plants (wood, fuelwood, straw, etc.) and aquatic plants mainly composed of lignin, cellulose, hemicellulose and other organic matter, and is a stable renewable energy resource. Compared with mineral energy such as coal and petroleum, it is not only low in sulfur, nitrogen, and ash, but also rich in sources. The annual output of crop straw in my country alone is about 700 million tons, and the amount of resources that can be used as energy is 280-350 million tons; The reasonable annual extraction of fuelwood is about 158 ​​million tons, and there are also a large number of aquatic plants. Therefore, biomass is hailed as an instant green energy source. [0003] Expan...

AI Technical Summary

Problems solved by technology

The disadvantage of the concentrated acid hydrolysis method is that the hydrolysis period is long, and the acid must be recovered. At present, the cost of acid recovery is relatively high

However, the main disadvantage of the simulated moving bed is that the concentration of the product liquid is lower than that of the feed liquid. At the same time, the industrial application of the simulated moving bed is mainly limited to the separation of the two-component system, and the composition of the biomass hydrolyzate is relatively complex.

In addition, the simulated moving bed also has insurmountable problems. One is the complexity of the equipment, which may be more difficult to use and maintain than high-performance liquid chromatography. Generally, eight to sixteen columns with similar performance are used, which makes the optimal purification conditions more complicated.

Second, the physical and chemical mechanism of the separation process is complex, and there are many parameters that affect the separation effect. In the process of industrial scale-up, it takes a long time to explore the operating conditions of the process, which affects the application of simulated moving bed in industrial production.

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