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Method for increasing reducing sugar yield by coupling of membrane separation and lignocellulose acid hydrolysis

A technology of lignocellulose and acid hydrolysis, applied in the production, application, fructose production and other directions of sugar, can solve problems such as not meeting the requirements, avoid continuous degradation, facilitate subsequent transformation, and reduce pollution.

Inactive Publication Date: 2012-12-26
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The membrane separation process driven by pressure difference mainly includes microfiltration, ultrafiltration, nanofiltration and reverse osmosis; membrane materials can be divided into organic membranes and inorganic membranes, most of which are organic polymer membranes, which have been widely used, but for high temperature , high pressure, strong corrosion and other harsh conditions, organic membranes cannot meet the requirements due to the limitations of their materials, and compared with organic membranes, inorganic membranes have the advantages of high temperature resistance, chemical corrosion resistance, bacteria resistance and high strength, which can make up for organic membranes. The lack of membranes meets more stringent conditions, making membrane separation technology more widely used

Method used

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  • Method for increasing reducing sugar yield by coupling of membrane separation and lignocellulose acid hydrolysis
  • Method for increasing reducing sugar yield by coupling of membrane separation and lignocellulose acid hydrolysis
  • Method for increasing reducing sugar yield by coupling of membrane separation and lignocellulose acid hydrolysis

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Experimental program
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Effect test

Embodiment 1

[0033] The implementation steps are as follows:

[0034] (1) Press figure 1 For the operation shown in the flow chart, weigh 30 g of rice straw with a particle size of 180 mesh and add it to Reactor 1, add 450 ml of sulfuric acid solution with a mass fraction of 0.05% at a solid-to-liquid ratio (g / ml) of 1:15, and open the air inlet valve 11 to add Press to 1.6 MPa, react at a temperature of 200 °C and a stirring rate of 500 r / min. The outlet of the hydrolyzed solution at the bottom of the reactor is equipped with an ordinary filter 2, and the ordinary filter is a 500-mesh stainless steel filter. The obtained hydrolyzed solution passes through the ordinary filter. Filtration to obtain the permeate containing small lignocellulose particles, high polysaccharides and reducing sugars, and the retained large lignocellulose particles are left in the reactor to continue hydrolysis;

[0035] (2) Open the hydrolyzate outlet valve 3 and the microfiltration feed pump 5, so that the perm...

Embodiment 2

[0041] The implementation steps are as follows:

[0042] (1) In order to solve the deficiencies in Example 1 and facilitate the cleaning of the reactor, the process of Example 1 was improved, and the installation position of the stainless steel filter was changed, such as figure 2 shown.

[0043] (2) Press figure 2 For the operation shown in the flow chart, weigh 30 g of rice straw with a particle size of 180 mesh and add it to Reactor 1, add 450 ml of sulfuric acid solution with a mass fraction of 0.05% at a solid-to-liquid ratio (g / ml) of 1:15, and open the air inlet valve 11 to add Pressure to 1.6 MPa, react at a temperature of 200 °C and a stirring rate of 500 r / min. The outlet of the hydrolyzate is set in the middle of the reactor, and the outlet is wrapped by an ordinary filter 2. The ordinary filter is a 500-mesh stainless steel filter. The obtained hydrolyzate passes through Ordinary membrane filtration to obtain the permeate containing small lignocellulose parti...

Embodiment 3

[0050] Specific steps are as follows:

[0051] (1) Press image 3 For the operation shown in the process, weigh 30 g of rice straw with a particle size of 180 mesh and add it to Reactor 1, add 450 ml of sulfuric acid solution with a mass fraction of 0.05% at a solid-to-liquid ratio (g / ml) of 1:15, and open the intake valve 11 Pressurize to 1.6 mpa, and react at a temperature of 200 °C and a stirring speed of 500 r / min.

[0052] (2) A hydrolyzate outlet is installed in the middle of the reactor, and the outlet is composed of composite tubular membrane modules 13, which are ordinary filter 14, microfiltration membrane 15 and ultrafiltration membrane 16 from outside to inside, and the ordinary filter is 500 mesh stainless steel The microfiltration membrane is a 0.5 μm inorganic ceramic membrane, and the ultrafiltration membrane is an inorganic ceramic membrane with a molecular weight cut-off of 10,000 Daltons. Open the outlet valve 3 of the hydrolyzate, and the hydrolyzate passe...

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Abstract

The invention relates to a method for increasing reducing sugar yield by coupling of membrane separation and lignocellulose acid hydrolysis. The method is characterized in that hydrolytic reaction and the membrane separation are coupled to realize timely separation of hydrolysate and avoid continuous degradation of the hydrolysate, so that the reducing sugar yield is increased, fermentation inhibitors are prevented from being generated effectively, and subsequent fermentation is facilitated. According to the method, ordinary filtration, micro filtration and ultrafiltration are combined for use organically, the pollution of the hydrolysate to an ultrafiltration membrane is reduced effectively; and as various filter membrane retention substances return to a reaction kettle for continuous hydrolysis, the substrate conversion efficiency and the purity of the hydrolysate are improved, and the reducing sugar yield is increased.

Description

field of invention [0001] The invention belongs to the technical field of conversion and utilization of biomass resources, in particular to a method for increasing the yield of reducing sugar by coupling membrane separation and lignocellulose acid hydrolysis. Background technique [0002] Due to the shortage and soaring price of petroleum energy, as well as the increasingly prominent environmental pollution, biomass, as a renewable resource, is being paid more and more attention. [0003] Lignocellulose is mainly composed of three components: cellulose, hemicellulose and lignin. Among them, lignocellulose is a cellulose macromolecule connected by D-glucose through β-1,4 glycosidic bonds. Different cellulose macromolecules form large polymers through hydrogen bonds, and the hydrolyzed product is glucose. Hemicellulose is a mixture of different polysaccharides, and its hydrolysis products are mainly xylose, arabinose and a small amount of six-carbon sugar. Lignin is a kind o...

Claims

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Application Information

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IPC IPC(8): C13K1/02C13K1/04C13K5/00C13K7/00C13K11/00C13K13/00
CPCG02F1/136286G02F1/136213G02F2201/121
Inventor 王存文王为国覃远航冀少卿吕仁亮张俊峰
Owner WUHAN INSTITUTE OF TECHNOLOGY
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