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A parameter adjustment method to eliminate the difference in pretreatment efficiency of different lignocellulosic raw materials

A lignocellulose and parameter adjustment technology, which is applied in the field of parameter adjustment to eliminate the difference in pretreatment efficiency of different lignocellulose raw materials, can solve the problems such as time-consuming and energy-consuming, restricting industrial application, and difference in pretreatment effect, and achieves improved stability. sexual effect

Active Publication Date: 2021-09-28
CATHAY R&D CENT CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lignocellulosic raw materials are mostly agricultural and forestry wastes, and these materials will be mixed with a large amount of alkaline ash substances during the growth, collection, and storage processes. These alkaline substances will neutralize different amounts of acid during the pretreatment process, resulting in The effect varies significantly with different raw materials, which seriously affects the applicability of biorefinery technology
For these different batches, different varieties or raw materials from different origins, it takes a lot of time and energy to optimize experiments based on conditions such as temperature, reaction time and acid dosage, which has become a constraint for the industrial application of lignocellulose pretreatment process. a challenge of

Method used

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  • A parameter adjustment method to eliminate the difference in pretreatment efficiency of different lignocellulosic raw materials
  • A parameter adjustment method to eliminate the difference in pretreatment efficiency of different lignocellulosic raw materials
  • A parameter adjustment method to eliminate the difference in pretreatment efficiency of different lignocellulosic raw materials

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Roughly cut the air-dried corn stalks into 0.1-10cm long, and remove the large-grained stones and gravel, and directly crush them with a hammer mill until the particle size passes through a sieve with an inner diameter of 1cm, and the ash content of the raw material is 6.65%. The amount of acid is not adjusted by titration. Take 2.00% (w / w) sulfuric acid / g dry solids, use corn stalks and the acid solution formulated according to the amount of acid at a solid-liquid ratio of 2:1, at 175 ° C, 0.8 MPa Pretreatment for 5 minutes under the same conditions; the content of xylan in the pretreated material is 9.01±0.30%, the content of acetic acid is 10.56±0.24mg / g DM, and the content of furfural is 0.82±0.02mg / g DM. The batch of pretreated corn stalks was subjected to an enzymolysis test. The operating conditions were solid content of 2.5% (mass ratio), cellulase dosage of 20FPU / g dry solids, and enzymolysis time of 72 hours in a constant temperature water bath at 50°C and 150r...

Embodiment 2

[0015] Roughly cut the air-dried corn stalks into 0.1-10cm long, and remove the large-grained stones and gravel, and directly crush them with a hammer mill until the particle size passes through a sieve with an inner diameter of 1cm, and the ash content of the raw material is 6.65%. When 2g of dry solid is mixed with 100g of deionized water, the pH value at this time is 6.81. When it is titrated to pH 2.30 with 4% (w / w) sulfuric acid solution, 1.62g of acid solution is required, calculated by It is known that the amount of sulfuric acid required for the dilute acid pretreatment process is 3.24% (w / w) sulfuric acid / g dry solids, using corn stalks and the acid solution made according to the amount of acid with a solid-to-liquid ratio of 2:1, at 175 ° C , 0.8MPa under the condition of pretreatment for 5min; pretreated material xylan content 3.09±0.22%, acetic acid content 18.25±0.20mg / g DM, furfural content 3.09±0.02mg / g DM. The batch of pretreated corn stalks was subjected to an...

Embodiment 3

[0017] Roughly cut the air-dried corn stalks into 0.1-10cm long, and remove large particles of gravel, add water to clean the stalks at a mass ratio of 10:1 (water:stalks), squeeze the stalks after cleaning, and store the solids at 105°C Dry in an oven, and after drying, use a hammer mill to crush until the particle size passes through a sieve with an inner diameter of 1cm. At this time, the ash content of the raw material is 5.30%. When 2g of dry solids are mixed with 100g of deionized water, the pH value at this time It is 6.74, when using 4% (w / w) sulfuric acid solution it is titrated to pH when it is 2.30, required acid solution 1.195g, by calculating the required sulfuric acid consumption of dilute acid pretreatment process is 2.39% (w / w) Sulfuric acid / g dry solids, use corn stalks and the acid solution formulated according to the amount of acid at a solid-to-liquid ratio of 2:1, and pretreat for 5 minutes at 175°C and 0.8MPa; The sugar content is 3.18±0.03%, the acetic ...

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Abstract

The invention discloses a parameter adjustment method for eliminating differences in pretreatment efficiency of different lignocellulose raw materials. In the process of lignocellulose pretreatment, there are often significant differences in the pretreatment efficiency of different varieties, different origins, and different batches of raw materials without parameter adjustment, and traditional parameter determination experiments are time-consuming and laborious. The invention can quickly determine the pretreatment conditions of different raw materials only by measuring the acid neutralization ability of lignocellulosic raw materials and calculating by formulas. The specific steps are: (1) rough cutting, removing sand and crushing of lignocellulosic raw materials; (2) preparing the material obtained in step (1) into a suspension slurry, and titrating it to a specific pH value with dilute sulfuric acid , calculate the amount of sulfuric acid required for the pretreatment process according to the amount of sulfuric acid based on the unit dry solids, and perform dry dilute acid pretreatment; (3) perform enzymatic hydrolysis or simultaneous saccharification and fermentation on the pretreated material obtained in step (2), etc. Subsequent bioprocessing steps.

Description

【Technical field】 [0001] The invention relates to the fields of lignocellulose biorefinery and bioenergy, and relates to a parameter adjustment method for eliminating differences in pretreatment efficiency of different lignocellulose raw materials. 【Background technique】 [0002] At present, the most mainstream pretreatment methods for lignocellulosic raw materials include dilute acid pretreatment and steam explosion pretreatment, especially dilute sulfuric acid pretreatment and acid-catalyzed steam explosion pretreatment are the most effective. The principle is to use the acidic environment under high temperature and pressure to hydrolyze hemicellulose, thereby destroying the structure of lignocellulosic materials and improving the conversion rate of cellulose in the subsequent enzymatic hydrolysis process. The three key factors affecting the strength of dilute acid pretreatment are acid dosage, residence time and pretreatment temperature. However, lignocellulosic raw mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P19/04
CPCC12P19/04C12P2201/00
Inventor 鲍杰韩昫身张建
Owner CATHAY R&D CENT CO LTD
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