Pretreatment method of lignocellulose raw material

A technology of lignocellulose and raw materials, which is applied in the field of biorefinery and bioenergy, can solve the problems of poor hydrolysis efficiency of cellulase, reduce the ability to hydrolyze hemicellulose, weaken the acidic environment of pretreatment, etc., and achieve the effect of enhanced pretreatment , reduce energy consumption, reduce the effect of sulfuric acid consumption

Inactive Publication Date: 2014-06-11
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its main components are alkaline compounds such as calcium salts, magnesium salts, and silicates. If they remain in the raw materials during pretreatment, they will neutralize with dilute acids, thereby weakening the acidic environmen

Method used

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  • Pretreatment method of lignocellulose raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The air-dried corn stalks are roughly cut into 0.1-10 cm long, and directly pulverized with a hammer mill to a particle size of 0.1-0.5 cm without cleaning and dedusting. At this time, the pH value of the material is 9.1. Then material is through dilute acid high-temperature pretreatment (solid-to-liquid ratio 2: 1, sulfuric acid consumption 2.5% (w / w), 190 ℃ of reaction temperatures, 3 minutes), the used equipment of pretreatment is ribbon agitation type pretreatment reactor ( See attached for structure figure 1 ), the pretreated stalks were put into the Erlenmeyer shaker flask; the solid content reached 2% (w / w), and cellulase (Shanghai Youtel Company) was added, the enzyme amount was 15FPU / gDM, 50°C, 150rpm The conversion rate of cellulose was only 27% after 72 hours of enzymatic hydrolysis on a water bath shaker.

[0039] See attached figure 1 , a mechanical stirring device is installed on the still body of the described ribbon stirring type pretreatment reactor, ...

Embodiment 2

[0050] The air-dried corn stalks are roughly cut into 0.1-10 cm long, and directly pulverized in a hammer mill to a particle size of 0.1-0.5 cm without cleaning and dedusting, and the pH value of the material at this time is 9.1. Then material is through dilute acid high temperature pretreatment (solid-liquid ratio 1: 1, sulfuric acid consumption 5% (w / w), reaction temperature 190 ℃, 3 minutes), the used equipment of pretreatment is the ribbon stirring type pretreatment reactor, The structure is the same as in Example 1; the pretreated stalks are put into an Erlenmeyer shaker flask, and the solid content reaches 2% (w / w), and cellulase (Shanghai Youtel Company) is added, and the enzyme amount is 15FPU / gDM, 50°C, 150rpm water-bath shaker enzymolysis for 72h, the conversion rate of cellulose is 50%.

Embodiment 3

[0052] Roughly cut the air-dried corn stalks into 0.1-10cm lengths, add water to clean the stalks at a mass ratio of 200:1 (water:stalks), place them in an oven at 105°C for drying, and place them in a hammer mill after drying. Medium crushing until the particle size is 0.1-0.5cm, and the pH value of the material after cleaning and dust removal is 8.0. Then material is through dilute acid high temperature pretreatment (2: 1 solid-liquid ratio, sulfuric acid consumption 2.5% (w / w), 190 ℃ of reaction temperatures, 3 minutes), the used equipment of pretreatment is the ribbon stirring type pretreatment reactor, The structure is the same as in Example 1; the pretreated stalks are put into an Erlenmeyer shaker flask, and the solid content reaches 2% (w / w), and cellulase (Shanghai Youtel Company) is added, and the enzyme amount is 15FPU / gDM, 50°C, 150rpm water-bath shaker enzymolysis for 72h, the conversion rate of cellulose can reach 55%.

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Abstract

The invention relates to a pretreatment method of a lignocellulose raw material. The pretreatment method comprises the following steps: (1) coarsely cutting a lignocellulose raw material, removing large impurities such as sands; (2) eliminating ash from the lignocellulose raw material obtained in the step (1); (3) subjecting the lignocellulose raw material obtained in the step (2) to a pretreatment; (4) subjecting the lignocellulose raw material obtained in the step (3) to an enzymatic hydrolysis or synchronous saccharification and fermentation. The pretreatment method has the advantages that: ash can be completely removed, thus the chemical catalyst will not be neutralized during the pretreatment process by the alkaline ash in the lignocellulose raw material, so the chemical reagent using amount in the pretreatment process is reduced, and the pretreatment effect and the cellulose conversion rate and hemicelluloses conversion rate of the lignocellulose raw material are all improved.

Description

【Technical field】 [0001] The invention relates to the fields of biorefinery and bioenergy, in particular to a pretreatment method for lignocellulosic raw materials. 【Background technique】 [0002] The bioprocessing process of lignocellulosic raw materials generally includes pretreatment, saccharification, fermentation, product separation and other processes. Pretreatment refers to the process of destroying the original composition and structure of lignocellulose by various physical, chemical and biological methods, which can greatly improve the efficiency of subsequent saccharification and fermentation processes, and improve the conversion of cellulose and hemicellulose components. Rate. Therefore, it can be said that the pretreatment of lignocellulose is the most critical step in the whole bioprocessing process. [0003] At present, the most mainstream pretreatment methods for lignocellulosic raw materials include dilute acid pretreatment and steam explosion pretreatment ...

Claims

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Application Information

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IPC IPC(8): C12P7/10C12P5/02C12P19/14
CPCY02E50/10Y02E50/30
Inventor 鲍杰方镇宏张建
Owner EAST CHINA UNIV OF SCI & TECH
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