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Method used for producing hydrogen by taking cellulose as raw material

A cellulose and cellulose-based technology, applied in the field of biomass energy production, can solve the problems of impossible breakthrough in hydrogen production efficiency, unfavorable technology promotion and application, difficult control of microwave oven temperature and pressure, and reduce detoxification. and other processes, improve the efficiency of cellulose degradation and the effect of fast heating

Inactive Publication Date: 2016-06-29
COFCO GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that it is impossible to achieve a breakthrough increase in hydrogen production efficiency by only using dark fermentation as a fermentation method.
Although non-patent document 2 adopts microwave-assisted alkali treatment, yet this document utilizes a microwave oven as a heating instrument, and cannot form a closed environment to generate constant high temperature and high pressure pretreatment conditions. In this document, the highest yield of reducing sugar does not exceed 3 %( figure 1 ); In addition, because the temperature and pressure of the microwave oven are difficult to control, it is not conducive to the popularization and application of the technology; especially, in this document, after adding 6g glucose to the cellulosic biomass hydrogen production substrate, compared with 6g pure glucose Compared with the hydrogen production substrate, the hydrogen production did not increase significantly, which indicates that the cellulosic biomass pretreated by microwave in this document cannot be effectively utilized by photosynthetic bacteria for hydrogen production.
Although there are two-step hydrogen production methods that combine dark fermentation and light fermentation in the prior art, most of them are researched on small molecular sugars with simple structures (such as glucose, sucrose, etc.) and easy-to-use starchy biomass. , there is a lack of research on efficient pretreatment methods and hydrogen production processes for cellulosic biomass

Method used

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  • Method used for producing hydrogen by taking cellulose as raw material
  • Method used for producing hydrogen by taking cellulose as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Example 1: Using rice straw to produce hydrogen

[0080] (1) Microwave alkali digestion: the dry weight of the dry weight of the cellulose biomass and the mass ratio of the sodium hydroxide solution are as follows: Mix at a ratio of 2:100, pressurize and heat for 15 minutes in a microwave heating and digestion apparatus at 140°C and a pressure of 0.2-0.7MPa.

[0081](2) Enzymatic hydrolysis: use 6mol / L hydrochloric acid to adjust the pH of the digestion solution obtained in step (1) to 4.5, and in the digestion solution according to the mass ratio of cellulase and the dry weight of cellulosic biomass to 4:100 Cellulase was added for enzymatic hydrolysis at 45°C for 84 hours. The reducing sugar concentration in the solution after enzymolysis was determined (Table 1).

[0082] (3) Hydrogen production by dark fermentation: add the solution after step (2) enzymatic hydrolysis into the dark fermentation reactor, add the dark fermentation medium according to the volume rati...

Embodiment 2

[0086] Example 2: Production of hydrogen from corn stalks

[0087] (1) Microwave alkali digestion: the dried and pulverized corn stalks (particle diameter≤1mm) and the potassium hydroxide solution with a concentration of 2.0wt% are according to the mass ratio of the dry weight of the cellulosic biomass to the potassium hydroxide solution: Mix at a ratio of 4:100, pressurize and heat for 20 minutes in a microwave heating and digestion apparatus at 145°C and a pressure of 0.2-0.76MPa.

[0088] (2) Enzymatic hydrolysis: use 6mol / L dilute sulfuric acid to adjust the pH of the digestion solution obtained in step (1) to 4.8, and use 3:100 in the digestion solution according to the mass ratio of cellulase and the dry weight of cellulosic biomass Cellulase was added to the medium, and the enzymatic hydrolysis was carried out at 40°C for 96 hours.

[0089] (3) Hydrogen production by dark fermentation: add the solution after step (2) enzymatic hydrolysis into the dark fermentation reac...

Embodiment 3

[0093] Example 3: Production of hydrogen from wheat straw

[0094] (1) Microwave alkali digestion: dry and pulverize wheat straw (particle size≤1mm) and ammonia solution with a concentration of 3.0wt% according to the mass ratio of the dry weight of cellulosic biomass to the ammonia solution is 5:100 Proportionally mixed, pressurized and heated for 10 minutes in a microwave heating digestion apparatus at 135° C. and a pressure of 0.2 to 0.6 MPa.

[0095] (2) Enzymatic hydrolysis: use 6mol / L phosphoric acid to adjust the pH of the digestion solution obtained in step (1) to 4.2, and in the digestion solution according to the mass ratio of cellulase and the dry weight of cellulosic biomass is 2.5:100 Cellulase was added for enzymatic hydrolysis at 39°C for 84 hours.

[0096] (3) Hydrogen production by dark fermentation: add the solution after step (2) enzymatic hydrolysis into the dark fermentation reactor, add the dark fermentation medium according to the volume ratio of the da...

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Abstract

The invention provides a method used for producing hydrogen by taking cellulose as a raw material. The method comprises following steps: 1, microwave alkali digestion; 2, enzyme hydrolysis; 3, dark fermentation hydrogen production; 4, photo fermentation hydrogen production; and 5, purification. The method is high in hydrogen yield, hydrogen production efficiency, substrate utilization ratio, and energy conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of biomass energy production, and in particular relates to a method for producing hydrogen by using cellulose as a raw material. Background technique [0002] Hydrogen energy is one of the ideal clean energy sources and has attracted widespread attention. Biological hydrogen production uses the physiological mechanism of microorganisms to catalyze dehydrogenation and generate hydrogen molecules in the metabolic process, and produce hydrogen through the fermentation process using organic matter as the substrate. Since the whole process does not need to use mineral resources as raw materials, the environmental pollution is low and the ecological effect is high, the current research on biological hydrogen production has become a hot spot. However, the traditional method has high cost of raw materials and low hydrogen production rate, which restricts the development and application of biological hydrogen produc...

Claims

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Application Information

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IPC IPC(8): C12P3/00C12R1/01C12R1/38
Inventor 苏会波程军周俊虎岑可法林海龙
Owner COFCO GROUP
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