Electrodialysis method for separating sugar and acid in biomass hydrolysate

A hydrolyzate and biomass technology, applied in dialysis, sugar derivatives, sugar derivatives, etc., can solve problems such as difficult use and maintenance, long time, complicated equipment, etc., to reduce power and equipment costs, and increase sugar content , the effect of simple equipment

Inactive Publication Date: 2004-02-25
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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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 problem

Method used

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  • Electrodialysis method for separating sugar and acid in biomass hydrolysate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 500ml of biomass hydrolyzate after vacuum filtration (total sugar mass percentage concentration is 5.82%, hydrochloric acid mass percentage concentration is 1.21%, acetic acid mass percentage concentration is 0.76%), is driven into the treatment chamber by the pump, and the constant flow pump is opened to make the treatment The hydrolyzate in the chamber forms a closed loop, adjusts the output voltage of the DC stabilized source power supply, controls the operating voltage at 45V, and starts the electrodialysis method (the bipolar membrane used is the BP-1E bipolar membrane produced by Japan Tokuyama (Soguyama) Co. Membrane; anion-exchange membrane is the A501SB anion-exchange membrane produced by Japan Asahi Chemical (AsahiChemical) company) separation process of sugar and acid. Use a digital pH meter to measure the pH value of the treatment chamber in real time, and record the operating current regularly. When the pH value of the treatment chamber rises to 5.5, the su...

Embodiment 2

[0022] The operating voltage is 40V, and other process conditions are the same as in Example 1. The operation time of the whole process is 248 minutes, the average current is 1.20A, the recovery rate of acid is 98.5%, and the loss rate of sugar is 2.86%.

Embodiment 3

[0024] The operating voltage is 35V, and other process conditions are the same as in Example 1. The operation time of the whole process was 326 minutes, and the average current was 0.94 A. The acid recovery was 98.5%, and the sugar loss was 3.17%.

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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...

Claims

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Application Information

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IPC IPC(8): B01D61/24C01B7/07C07C51/42C07H1/06C07H3/02C13K1/02
Inventor 颜涌捷李浔张素平任铮伟李庭琛
Owner EAST CHINA UNIV OF SCI & TECH
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