Bio-refinery method for co-producing multiple products by using lignocellulose as raw material

A lignocellulose and biorefinery technology, applied in the separation/purification of biofuels, carboxylic acid compounds, organic chemistry, etc., can solve problems such as efficient separation of components, achieve high profit margins, easy recovery, and increase added value Effect

Inactive Publication Date: 2016-12-07
TSINGHUA INNOVATION CENT IN DONGGUAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional dilute acid pretreatment, alkali treatment and steam explosion treatment are difficult to achieve efficient separation of components through simple steps.

Method used

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  • Bio-refinery method for co-producing multiple products by using lignocellulose as raw material
  • Bio-refinery method for co-producing multiple products by using lignocellulose as raw material
  • Bio-refinery method for co-producing multiple products by using lignocellulose as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Formic acid pretreatment of wheat straw

[0028] The lignocellulosic raw material used is wheat straw, and the place of origin is Shandong Province. Straws are cut into 1-2cm lengths for later use. According to the lignocellulose component determination method of the US Renewable Energy Laboratory, the main components of the used wheat straw were analyzed, and the results were: moisture 5.1%, dextran 33.40%, xylan 22.26%, arabinan 3.10% , lignin 20.08%, acetyl 2.01%, ash 6.48%, other soluble solids 7.57%.

[0029] Using different concentrations of formic acid solutions at a liquid-solid ratio (L / kg) of 10:1 to pretreat for different times at different temperatures, the mixture after pretreatment is vacuum filtered, and the solid matter is treated with the same concentration of formic acid as in the pretreatment process based on the initial The dry weight of the solid was washed once at a liquid-solid ratio of 5:1, and then vacuum filtered. The solid was evaporated und...

Embodiment 2

[0032] Example 2: Enzymolysis performance of cellulose solids after pretreatment

[0033] The raw materials used and the pretreatment process are the same as in Example 1. Wheat straw was pretreated with 88% formic acid at different temperatures. After pretreatment, the cellulose solid was hydrolyzed under the conditions of 2.5% initial solid content, 20 FPU / g solid cellulase dosage, 50° C., pH 4.8, and 150 rpm. The enzymatic hydrolysis time curve is attached figure 2 Show.

[0034] Result analysis: within a certain period of time, increasing the temperature and pretreatment time can increase the enzymatic conversion rate of dextran, and the enzymatic conversion rate began to decrease after the pretreatment time exceeded a certain period of time. The main reason is that with the increase of pretreatment time, the degree of formylation of cellulose increases, which is not conducive to the recognition of cellulose by cellulase. Therefore, the pretreatment process needs to c...

Embodiment 3

[0035] Example 3: Conversion of cellulosic solids to ethanol after pretreatment

[0036] The raw materials used and the pretreatment process are the same as in Example 1. After pretreatment with 80% formic acid at 100°C for 1.5h, use 15% of the initial solid content, 25FPU / g solid cellulase dosage, 50°C, pH 5.0, 150rpm after prehydrolysis for 24h, adjust the pH to 5.5, the temperature dropped to 38°C, and synchronous saccharification and fermentation were carried out after inoculation of Saccharomyces cerevisiae. After 48 hours, the ethanol concentration in the fermentation broth was 35.2g / L, and the ethanol yield was 72.3%.

[0037] Result analysis: The pretreated cellulose solid can be effectively converted into ethanol.

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Abstract

The invention provides a bio-refinery method for co-producing multiple products by using lignocellulose as a raw material. The bio-refinery method comprises the steps that raw materials are pretreated by adopting a formic acid water solution the mass concentration of 50-80%, effective separation of cellulose, hemicellulose and lignin in the raw materials is achieved, further the cellulose is converted into ethanol, the lignin is converted into active carbon and solid acid, and the hemicellulose is converted into furfural. The bio-refinery method can achieve the diversity and high value conversion of the raw materials, remarkably improves the economical efficiency of the process, and the formic acid can be recycled and has remarkable environmental benefits.

Description

technical field [0001] The invention relates to the field of biomass chemical industry, in particular to a biorefining method in which lignocellulose is used as a raw material to co-produce multiple products. Background technique [0002] Lignocellulosic raw materials are the most abundant organic matter in nature. It is estimated that plants produce 150-200 billion tons of dry matter through photosynthesis every year, which is the only physical resource on the earth that can be regenerated on a large scale. In my country, more than 700 million tons of crop straw are produced every year, which is equivalent to 350 million tons of standard coal, but only about 2% of the cellulose resources are used for industrial processes or burned each year, and a large part is not used. [0003] Biorefining is a refining process in which renewable biomass is used as raw material and combined with various physical, chemical and biological methods to produce fuels, materials, chemicals and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10C07C51/44C07C53/02C07D307/50C08B37/14C08H7/00C08H8/00C01B31/12
CPCC07C51/44C07D307/50C08B37/146C08H8/00C12P7/10C12P2201/00C07C53/02Y02E50/10
Inventor 赵雪冰董磊刘德华
Owner TSINGHUA INNOVATION CENT IN DONGGUAN
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