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Plant fiber material acidolysis solution electrodialysis detoxification process and device

A technology of plant fiber and acid hydrolyzate, which is applied in the fields of bioenergy and green chemical industry, can solve problems such as low cost, and achieve the effects of small loss of reducing sugar, easy control, and good detoxification effect.

Inactive Publication Date: 2007-12-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Electrodialysis technology is one of the effective methods for separating electrolytes and non-electrolytes. It has been very mature in seawater desalination, fresh water and pure water. This method will not cause environmental pollution in application, and the cost is relatively low. In recent years, there will be There are reports on the use of electrodialysis technology in the desalination post-treatment of fermentation broth, but there is no research report on the detoxification process of hemicellulose acid hydrolyzate in lignocellulose by electrodialysis

Method used

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  • Plant fiber material acidolysis solution electrodialysis detoxification process and device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The straw is cut, dedusted and crushed to 40 mesh, and added to a sulfuric acid solution with an acid concentration of 7%, and the liquid-solid ratio of the solution to the plant fiber raw material is 5:1;

[0022] (2) Raise the temperature to 120° C. and maintain the temperature for 2 hours.

[0023] (3) The liquid-solid mixture obtained above is filtered, and 1L of acid hydrolyzate is added in the weak room tank 7; the concentration is 0.01mol / L sulfuric acid solution 1L in the concentrated room tank 4, and the concentration of 0.05mol / L is added in the cathode room tank. 0.75 L of sodium hydroxide solution in L; add 0.75 L of sulfuric acid solution with a concentration of 0.05 mol / L in the anode chamber tank.

[0024] (4) Turn on the pumps 8A-8D to circulate the solution in the concentrated chamber and the weak chamber in the electrodialyzer 1, and adjust the flow meter so that the solution flow rate in the concentrated chamber, the weak chamber, the anode chamber an...

Embodiment 2

[0028] The bagasse is cut, dedusted and crushed to 40 meshes, and then added to a hydrochloric acid solution with an acid concentration of 0.5%, and the liquid-solid ratio of the solution to the plant fiber raw material is 20:1;

[0029] (2) Raise the temperature to 80° C. and maintain the temperature for 10 hours.

[0030](3) The above gained liquid-solid mixture is filtered, and 1L of acid hydrolyzate is added in the dilute chamber tank 7; Adding concentration is 0.01mol / L hydrochloric acid solution 1L in the concentration chamber tank 4, and adding concentration is 0.05mol / L in the cathode chamber tank 0.75 L of sodium hydroxide solution in L; add 0.75 L of sulfuric acid solution with a concentration of 0.05 mol / L in the anode chamber tank.

[0031] (4) Turn on the pumps 8A-8D to circulate the concentrated chamber, the dilute chamber and the solution in the electrodialyzer 1, adjust the flow meter so that the solution flow rate in the concentrated chamber, the dilute chambe...

Embodiment 3

[0035] The wheat straw is cut, dedusted and crushed to 40 meshes, and added to an acetic acid solution with an acid concentration of 0.65%, and the liquid-solid ratio of the solution to the plant fiber raw material is 15:1;

[0036] (2) Raise the temperature to 100° C. and maintain the temperature for 6 hours.

[0037] (3) The above gained liquid-solid mixture is filtered, and 1L of acid hydrolyzate is added in the dilute chamber tank 7; Adding concentration is 0.01mol / L hydrochloric acid solution 1L in the concentration chamber tank 4, and adding concentration is 0.05mol / L in the cathode chamber tank 0.75 L of sodium hydroxide solution in L; add 0.75 L of sulfuric acid solution with a concentration of 0.05 mol / L in the anode chamber tank.

[0038] (4) Turn on the pumps 8A-8D to circulate the concentrated chamber, the dilute chamber and the solution in the electrodialyzer 1, adjust the flow meter so that the solution flow rate in the concentrated chamber, the dilute chamber, t...

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Abstract

The invention discloses a process for removing toxic material from acid hydrolysis solution of plant fiber raw material through electrodialysis, belonging to biological energy and green chemical industry field. It comprises following steps: cutting and dedusting plant fiber material at direct current field action in electrodialysis set, which comprises a plurality of anion exchange membrane and a plurality of cation exchange membrane; acid hydrolyzing plant fiber according to a certain solid and liquid ratio, the anion in acid hydrolysis solution moving into concentrated compartment passing through anion exchange membrane; while the cation moving into concentrated compartment passing through anion exchange membrane, so the acid in dilute compartments is removed. The invention can eliminate acid and other ionic foreigh matters from acid hydrolysis solution, greatly reduce the product loss rate and recover acid from hydrolysis solution, and it is characterized by simple device and process, good effect of removing toxic substance, easy for control, low cost and good industrial prospect.

Description

technical field [0001] The invention belongs to the fields of biological energy and green chemical industry, and in particular relates to an electrodialysis detoxification process of plant fiber raw material acid hydrolyzate. Background technique [0002] Lignocellulose is the most widely distributed and abundant organic matter in nature. An effective way of comprehensive utilization of lignocellulose is to convert it into fermentable sugar, and then into other products with higher added value, such as ethanol, xylitol and other organic acids. Treating lignocellulosic raw materials with about 0.5-7% acid solution at a high temperature of 80-120°C for several hours is the most commonly used hemicellulose dilute acid treatment method. The efficiency of dilute acid treatment is higher, and the time required is shorter when the temperature is high. After treatment, the hemicellulose is hydrolyzed into monosaccharides and dissolved in the hydrolyzate, the amount of lignin remain...

Claims

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Application Information

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IPC IPC(8): C13K1/04C07H1/08A23L1/015A23L5/20
Inventor 张建安程可可周玉杰刘宏娟刘德华
Owner TSINGHUA UNIV
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