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Method for preparing lignin sulfonate by utilizing residue from enzymatic hydrolysis of lignocellulose

A technology of lignosulfonate and lignocellulase, which is applied in the field of preparation of lignosulfonate, can solve problems such as waste, and achieve the effects of improving utilization rate, significant economic and social benefits, and easy operation

Active Publication Date: 2012-07-18
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the hemicellulose and cellulose components of lignocellulose are utilized, a large amount of hydrolysis residue will be produced, and most of the lignin components will still remain in it. If not utilized, it will cause great waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 1.5 kg of corncobs to 9 kg of dilute sulfuric acid solution with a sulfuric acid concentration of 1.2%, and cook for 120 min at 118°C. After the reaction is completed, a bag centrifuge is used for solid-liquid separation to obtain acid hydrolysis residue. Acid hydrolysis residue is added in the reactor with agitation, add water and adjust dry matter concentration to 16%, adjust pH to 4.8, temperature 50 ℃, add cellulase (20FPIU / gram cellulose) and xylanase (15FPIU / gram cellulose ), the stirring speed was 200r / min, and after enzymatic hydrolysis for 48h, a bag centrifuge was used for solid-liquid separation, the filtrate was set aside, and the filter residue was the residue of enzymatic hydrolysis, which was used to prepare lignosulfonate. When cooking, the substrate concentration is 20%, the mass ratio of sodium bisulfite to enzyme hydrolysis residue is 10%, the reaction temperature is 160° C., and the reaction time is 5 hours. After the reaction, the degree of sul...

Embodiment 2

[0025] Add 1.5 kg of corn stalks to 15 kg of dilute sulfuric acid solution, the concentration of sulfuric acid is 0.8%, and cook at 125°C for 90 minutes. After the reaction, the bag centrifuge is used for solid-liquid separation to obtain acid hydrolysis residue. The acid hydrolysis residue is put into a stirred reactor, add water to adjust the dry matter concentration to 18%, adjust the pH to 5.1, and add cellulase (15FPIU / gram cellulose) and xylanase (20FPIU / gram cellulose) to 5.1 ), the stirring speed was 150r / min, and after 36 hours of enzymatic hydrolysis, a bag centrifuge was used for solid-liquid separation, the filtrate was set aside, and the filter residue, that is, the residue of enzymatic hydrolysis, was used to prepare lignosulfonate. When cooking, the substrate concentration is 10%, the mass ratio of sodium bisulfite to enzyme hydrolysis residue is 20%, the reaction temperature is 140° C., and the reaction time is 2 hours. After the reaction, the degree of sulfon...

Embodiment 3

[0027] Add 1.5 kg of wheat straw into 10.5 kg of dilute sulfuric acid solution, the sulfuric acid concentration is 2.0%, and cook for 150 min at 105°C. After the reaction, the bag centrifuge is used for solid-liquid separation to obtain acid hydrolysis residue. The acid hydrolysis residue is put into a stirred reactor, add water to adjust the dry matter concentration to 15%, adjust the pH to 4.6, and add cellulase (10FPIU / gram cellulose) and xylanase (30FPIU / gram cellulose) to 4.6 ), the stirring speed was 50r / min, and after enzymatic hydrolysis for 72 hours, a bag centrifuge was used for solid-liquid separation, the filtrate was set aside, and the filter residue, that is, the residue of enzymatic hydrolysis, was used to prepare lignosulfonate. When cooking, the substrate concentration is 5%, the mass ratio of sodium bisulfite to enzyme hydrolysis residue is 15%, the reaction temperature is 150° C., and the reaction time is 3 hours. After the reaction, the degree of sulfonati...

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Abstract

The invention relates to a method for preparing lignin sulfonate by utilizing residue from enzymatic hydrolysis of lignocellulose. The method comprises the following steps of: performing pretreatment on a lignocellulose raw material through a diluted acid method to get the residue from acid hydrolysis, performing enzymolysis with cellulase and xylanase to get the residue from the enzymatic hydrolysis, and further performing steam boiling and sulfonation on the residue from the enzymatic hydrolysis through a hydrosulphite process steam boiling technology to prepare a lignin sulfonate product. According to the method disclosed by the invention, the utilization rate of the lignocellulose raw material is improved, and the method further has better economic and social benefits.

Description

technical field [0001] The invention belongs to the field of biological fermentation engineering, and in particular relates to a method for preparing lignosulfonate by utilizing lignocellulosic enzyme hydrolysis residue. Background technique [0002] Lignocellulose resources are the most abundant renewable resources on the earth. It is estimated that the total annual output is as high as 150 billion tons, which contains huge biomass energy. my country is a large agricultural country, and the annual output of crop straw (such as straw, wheat straw, etc.) is very huge (the annual output can reach about 700 million tons, equivalent to 500 million tons of standard coal). According to statistics, the current utilization rate of straw is 33%. , but only 2.6% are used after certain technical treatment, and most of the rest are directly used as fuel, etc., and the development prospect is very broad. If a part of lignocellulosic resources can be converted into chemicals or energy, hu...

Claims

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Application Information

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IPC IPC(8): C08H7/00
Inventor 李荣杰
Owner ANHUI BBCA FERMENTATION TECH ENG RES
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