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Method for preprocessing lignocellulose raw materials for biorefinery

A lignocellulose and biorefinery technology, which is applied in the processing of fiber raw materials, natural cellulose pulp/paper, pulping with inorganic alkali, etc., can solve problems such as affecting the recovery rate of xylose, and achieve the effect of avoiding fermentation inhibition.

Inactive Publication Date: 2013-12-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to further degradation of hemicellulose degradants (xylose) to other by-products such as furfural, thereby affecting the recovery of xylose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] pH pre-corrected hydrothermal pretreatment of corn stover.

[0022] The yield of corn stalks is huge, and it is of great significance to make full use of corn stalks to produce biomass energy, chemicals and materials.

[0023]Crush the air-dried corn stalks (with a moisture content of about 8% (w / w)) to 2 mm. Pretreatment was carried out in a 1.6L hydrothermal reactor customized by the laboratory. In order to determine the optimal alkali dosage, the dosage of fixed corn stalk powder was 100g, tap water was 900ml, 2g, 3g, 4g and 5g of NaOH pre-corrected hydrolyzate were used respectively, and the batch without adding NaOH was used as a control. The raw material water and NaOH are fully mixed and put into the reactor. The reactor was heated in a salt bath at 230°C. When the temperature in the reactor reached 204°C, the reactor was immediately taken out from the salt bath, and cooling water was introduced into the cooling pipe inside the reactor, and the reactor Place i...

Embodiment 2

[0041] pH pre-correction hydrothermal pretreatment of miscanthus.

[0042] Miscanthus is a typical C4 plant with the advantages of large biomass and resistance to barrenness, and is a very potential biomass raw material.

[0043] Crush the air-dried miscanthus (Miscanthus lutarioriparious) to 5-10 mm. Pretreatment was carried out in the KCR-50 reactor. The literature [LeNgocHuyenT, RémondC, DheillyR, ChabbertB: Effect of harvesting date on the composition and saccharification of Miscanthus x giganteus. Bioresour Technol2010, 101:8224-8231.] reported that Miscanthus x giganteus acetyl content is between 3.43%-4.21%. According to a simple stoichiometric method known to those in the industry, the amount of alkali required to completely neutralize these acetyl groups, taking KOH as an example, is 3.26-4.00 g. Considering that the right part of the acetyl group still remains in the hemicellulose, 3 g KOH / 100 g Miscanthus was used for pH pre-correction of the hydrolyzate.

[0044...

Embodiment 3

[0046] pH pre-corrected hydrothermal pretreatment of corn cobs.

[0047] The air-dried corncobs were crushed to 5mm. Pretreatment is carried out in the TFCF reactor. The literature [Garrote G, Domínguez H, Parajo JC: Kineticm odelling of corncob autohydrolysis. Process Biochem 2001, 36:571-578.] reported that the acetyl content of corncob was 3.78% (w / w). The amount of base required to completely neutralize these acetyl groups, expressed in K 2 CO 3 For example, it is 8.84g. Considering that the acetyl group on the right part remains in the hemicellulose, 6gK 2 CO 3 Miscanthus per 100g was used for pH pre-correction of the hydrolyzate.

[0048] 100kg raw material, 600L water and 6kgK 2 CO 3 After thorough mixing, a mixture of about 14% (w / w) was formed and placed in the reactor. Set the temperature at 170°C, feed high-temperature steam to heat the reactor to 170°C, and then keep it warm for 20 minutes. After the holding time is over, put cooling water into the cooling...

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Abstract

The invention provides a method for preprocessing lignocellulose raw materials for biorefinery and discloses a method for preprocessing raw materials for biorefinery. The method comprises the following steps of promoting stripping of acetyl on hemicellulose in a preprocessing process by use of a small amount of alkali, and neutralizing formed acetic acid; carrying out precorrection on an acid environment formed in a hydrothermal preprocessing process, destroying chemical bonds between the hemicellulose and lignin by utilizing a high-temperature liquid water environment, so as to change the existence state of cellulose. The preprocessing method can be used for effectively avoiding generation of degradation products sourced from the hemicellulose and the lignin in the preprocessing process, greatly improving the hemicellulose recovery rate, and meanwhile ensuring that enzymolysis of the cellulose and the hemicellulose is easy. The preprocessed biomass raw materials can be used for production of cellulosic ethanol, oligosaccharide, xylitol and high-quality lignin.

Description

field of invention [0001] The invention belongs to the pretreatment technology of lignocellulosic biorefining, specifically a method for pretreating lignocellulose raw materials by adding a small amount of alkali before hydrothermal pretreatment. Background technique [0002] With the extensive use of fossil resources, while bringing convenience to people, it also brings a series of problems, such as environmental pollution and greenhouse effect. Even so, with the continuous increase of human energy and resource consumption, the fossil resources formed through long geological ages are also facing the problem of depletion. [0003] Biorefinery is the production of various chemicals, fuels and bio-based materials from agricultural wastes, plant-based starches and lignocellulosic materials. Biorefinery dramatically expands the use of renewable plant-based raw materials as a means of environmentally sustainable chemical and energy economic transformation. However, lignocellulo...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21H11/12D21H11/00
Inventor 徐建李宏强姜巍
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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