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Lignocellulose pre-processing method

A lignocellulose and pretreatment technology, applied in the field of bioengineering, can solve the problems of unsatisfactory hemicellulose recycling rate, cellulose enzymatic conversion rate, steam, raw material consumption, low degree of material treatment, etc., and achieve good treatment effect , reduce the loss of raw materials, and improve the effect of recycling

Active Publication Date: 2016-07-20
COFCO GROUP +2
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  • Abstract
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Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is that the pretreatment method of lignocellulose in the prior art has serious consumption of steam and raw materials in the process of steam explosion, the processing steps are loaded down with trivial details, and the degree of material treatment is low, and hemicellulose can be recycled and utilized. rate and conversion rate of cellulose enzymolysis are not ideal, and the yield of fermentation inhibitors during fermentation is relatively high, so as to provide a low cost, high raw material utilization rate, simple operation steps, high degree of material treatment, and hemicellulose recovery and utilization A method for pretreatment of lignocellulose with high yield, high conversion rate of cellulose enzymolysis, and low yield of fermentation inhibitors during fermentation, and the product prepared therefrom

Method used

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Embodiment 1

[0026] The pretreatment method of the lignocellulose of the present embodiment, concrete steps are as follows:

[0027] 1) Infiltration: take lignocellulose-containing raw materials and presoak liquid according to the weight ratio of 1:1.5, mix, and infiltrate;

[0028] 2) Dehydration: dehydrating the infiltrated raw material obtained in step 1) until the dry matter content is greater than or equal to 30%;

[0029] 3) Steam explosion: put the dehydrated raw material obtained in step 2) in a steam explosion device, feed saturated steam with a pressure of 1.08 MPaG, and mix at 210° C. for 5 minutes to obtain the product.

[0030] In this embodiment, the lignocellulose-containing raw material is oat husk; the presoaking solution is water.

Embodiment 2

[0032] The pretreatment method of the lignocellulose of the present embodiment, concrete steps are as follows:

[0033] 1) Soaking: Mix the lignocellulose-containing raw material with the prepreg in a weight ratio of 1:20, and soak for 100 minutes;

[0034] 2) Dehydration: dehydrating the infiltrated raw material obtained in step 1) until the dry matter content is greater than or equal to 35%;

[0035] 3) Steam explosion: put the dehydrated raw materials obtained in step 2) in a steam explosion device, feed supersaturated steam with a pressure of 0.35 MPaG, and mix at 148° C. for 48 minutes to obtain the product.

[0036] In this embodiment, the lignocellulose-containing raw material is a mixture of corncobs and hardwood; the presoaking solution is a sodium hydroxide solution with a concentration of 2 mol / L.

Embodiment 3

[0038] The pretreatment method of the lignocellulose of the present embodiment, concrete steps are as follows:

[0039] 1) Soaking: Mix the lignocellulose-containing raw material with the prepreg in a weight ratio of 1:11, and soak for 5 minutes;

[0040] 2) Dehydration: dehydrating the infiltrated raw material obtained in step 1) until the dry matter content is greater than or equal to 40%;

[0041] 3) Extrusion: put the dehydrated raw material obtained in step 2) into an extrusion extruder, feed saturated steam with a pressure of 1.8 MPaG, and mix at 180° C. for 90 minutes to obtain the product.

[0042] In this embodiment, the lignocellulose-containing raw material is a mixture of cork, nut shell, and grass; the presoaking solution is a sulfuric acid solution with a concentration of 0.2 mol / L.

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Abstract

The invention discloses a lignocellulose pre-processing method, which comprises the following steps: pre-impregnating, dehydrating, steam-exploding or extruding and swelling. According to the lignocellulose pre-processing method disclosed by the invention, in a pre-processed product, a hemicellulose recovery rate and a cellulase enzymatic hydrolysis conversion rate are high, and a material processing degree is high; and in addition, the acetic acid concentration of a lignocellulose-containing raw material, which is pre-processed by the method disclosed by the invention, is significantly reduced during fermenting, namely the yield of a fermentation inhibitor drops significantly.

Description

technical field [0001] The invention belongs to the field of bioengineering, and in particular relates to a pretreatment method of lignocellulose. Background technique [0002] In recent years, the depletion of many non-renewable fossil energy sources such as petroleum has drawn more and more attention to renewable energy, especially biofuels, and has brought huge business opportunities and social significance. [0003] Biomass energy is an important renewable energy in the future energy field. In recent years, countries all over the world are vigorously developing technologies related to the comprehensive utilization of biomass, and have achieved certain results in the production of fuel ethanol, biodiesel, biohydrogen, and biogas from biomass. It is a hotspot of research and development in various countries. my country is rich in biomass resources. According to statistics, the annual output of straw alone in my country can reach 700 million tons, which contains a conside...

Claims

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Application Information

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IPC IPC(8): C12P7/10
CPCY02E50/10
Inventor 李杰张宁李春玲袁敬伟尚贵臣于泳武国庆许克家杜伟彦岳国君
Owner COFCO GROUP
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