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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 problems such as unfavorable technology promotion and application, difficulty in controlling the temperature and pressure of microwave ovens, etc., reduce detoxification and other processes, improve cellulose degradation efficiency, simplify The effect of the process

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

AI Technical Summary

Problems solved by technology

In addition, because the temperature and pressure of microwave ovens are difficult to control, it is not conducive to the promotion and application of technology.
In particular, in this document, after adding 6 g of glucose to the hydrogen-producing substrate of cellulosic biomass, the amount of hydrogen produced did not increase significantly compared with 6 g of pure glucose as the hydrogen-producing substrate, which indicates that microwave pretreatment in this document The resulting cellulosic biomass 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
  • Method used for producing hydrogen by taking cellulose as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0080](1) Microwave acid digestion: the dried and pulverized wheat straw (particle size ≤ 1mm) was mixed with 0.5wt% H 2 SO 4 The solution is based on the dry weight of cellulosic biomass and H 2 SO 4 The mass ratio of the solutions was mixed at a ratio of 4:100, and digested under pressure and heating for 10 minutes in a microwave heating and digestion apparatus at 135° C. and a pressure of 0.2 to 0.7 MPa.

[0081] (2) Enzymatic hydrolysis: use 6mol / L sodium hydroxide to adjust the pH of the digestion solution obtained in step (1) to 4.3, and then digest according to the mass ratio of cellulase and the dry weight of cellulosic biomass to 2:100 Add cellulase to the solution, and enzymatically hydrolyze for 68 hours at 45°C. 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 hydr...

Embodiment 2

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

[0087] (1) Microwave acid digestion: combine dried and crushed corn stalks (particle size ≤ 1mm) with 1.0wt% H 2 SO 4 The solution is based on the dry weight of cellulosic biomass and H 2 SO 4 The mass ratio of the solution is 2:100, and the mixture is heated and digested in a microwave heating and digestion apparatus at 140°C and a pressure of 0.2-0.75MPa for 15 minutes.

[0088] (2) Enzymatic hydrolysis: use 6mol / L sodium hydroxide to adjust the pH of the digestion solution obtained in step (1) to 4.0, and then digest according to the mass ratio of cellulase and the dry weight of cellulosic biomass to 5:100 Add cellulase to the solution, and enzymatically hydrolyze for 72 hours at 40°C.

[0089] (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 dark fermentati...

Embodiment 3

[0093] Embodiment 3: Utilize water hyacinth to produce hydrogen

[0094] (1) Microwave acid digestion: the water hyacinth (particle diameter≤1mm) after drying and pulverizing and the HCl solution that concentration is 3.0wt% are 4:100 according to the dry weight of cellulosic biomass and the mass ratio of HCl solution Proportionally mixed, pressurized and heated for 25 minutes in a microwave heating digestion apparatus at 130°C and a pressure of 0.2-0.6MPa.

[0095] (2) Enzymatic hydrolysis: use 6mol / L potassium hydroxide to adjust the pH of the digestion solution obtained in step (1) to 4.8, and then digest according to the mass ratio of cellulase and the dry weight of cellulosic biomass to 2.5:100 Add cellulase to the solution, and enzymatically hydrolyze for 80 hours at 45°C.

[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...

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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 acid 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): C12P3/00C12R1/145C12R1/01
Inventor 苏会波程军周俊虎岑可法林海龙
Owner COFCO GROUP
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