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Catalytic liquid and continuous treatment process for straw biomass

A biomass treatment and processing technology, which is applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, lignin derivatives, etc. Problems such as low pretreatment efficiency, to achieve the effect of reducing production cost, improving production efficiency, and improving dissolution rate

Active Publication Date: 2021-03-30
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in-depth research has been done on the industrial application of cellulose, hemicellulose and lignin, such as the traditional strong acid method, strong alkali method, sulfite method, etc., but the separation efficiency of the components is low and the energy consumption of the separation process is low. High, the separation process produces high-salt wastewater, the structure of the separated lignin and hemicellulose or hydrolyzate is severely damaged and the yield is low, and it is difficult to realize the utilization of all components of lignocellulose
[0005] CN1786340A uses formic acid and hydrogen peroxide synergistically to separate and obtain cellulose, hemicellulose hydrolyzate and lignin solid, the conditions are mild, but the process reaction and treatment time are long, the pretreatment efficiency is low, and the pretreatment process needs continuous heating , high energy consumption, difficult to achieve industrialization
[0006] CN103790056A uses twin-screws to pretreat lignocellulose, which improves the pretreatment efficiency compared with traditional batch and treatment equipment, but the pretreatment system has a low selective removal rate for hemicellulose, and still needs the second step of pretreatment. Treatment such as chemical method or biological method to remove hemicellulose from the material, the process is complicated, and at the same time, it is inevitable to increase energy consumption and prolong the pretreatment time, which limits the feasibility of industrialization of lignocellulose refining
Therefore, although the current pretreatment of lignocellulose has realized the utilization of cellulose, the conversion and removal rate of hemicellulose or lignin is still low, and it is difficult to realize the efficient separation and utilization of the three major components.

Method used

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  • Catalytic liquid and continuous treatment process for straw biomass
  • Catalytic liquid and continuous treatment process for straw biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1) Cut the wheat stalks into 3-5cm small pieces, transport them to the hot water extraction screw, the material passes through the screw process, add hot water at 90°C whose weight is 5 times that of the dry material, squeeze and dehydrate, and transport to the twin-screw;

[0063] 2) Separating by twin-screw, pumping in a mixed solution of 5 times the volume of the absolute dry material during the period, in the mixed solution, formic acid accounts for 32%, acetic acid accounts for 48%, hydrogen peroxide accounts for 3%, AZADO accounts for 0.45%, and the remaining 16.55% is water;

[0064] 3) The material that has been efficiently mixed with the twin-screw and the mixed solution is sent to the continuous heat preservation screw, and the heat preservation reaction is carried out at 85°C for 1 hour;

[0065] 4) Add a mixed solution of 50% acetic acid and water to the material after heat preservation treatment, dilute the material to a concentration of 90g / L, and then tra...

Embodiment 2

[0070] 1) Cut the wheat stalks into 3-5cm small pieces, transport them to the hot water extraction screw, the material passes through the screw process, add hot water at 90°C whose weight is 5 times that of the dry material, squeeze and dehydrate, and transport to the twin-screw;

[0071] 2) Separating by twin-screw, pumping in a mixed solution of 5 times the volume of the absolute dry material during the period, in the mixed solution, formic acid accounts for 32%, acetic acid accounts for 48%, hydrogen peroxide accounts for 3%, AZADO accounts for 0.45%, and the remaining 16.55% is water;

[0072] 3) The material that has been efficiently mixed with the twin-screw and the mixed solution is sent to the continuous heat preservation screw, and the heat preservation reaction is carried out at 85°C for 1.5h;

[0073] 4) Add a mixed solution of acetic acid and water each accounting for 50% to the material after heat preservation treatment, and dilute the material to a concentration ...

Embodiment 3

[0077] 1) Cut the wheat straw into small pieces of 3-5cm. Convey to the hot water extraction screw, the material passes through the screw process, add 90 ℃ hot water whose weight is 5 times that of the absolute dry material, squeeze and dehydrate, and then transport to the twin-screw;

[0078] 2) Separating by twin-screw, pumping in a mixed solution of 5 times the volume of the absolute dry material, in the mixed solution, formic acid accounts for 22%, acetic acid accounts for 52%, hydrogen peroxide accounts for 3%, AZADO accounts for 0.45%, and the remaining 22.55% is water;

[0079] 3) The material that has been efficiently mixed with the twin-screw and the mixed solution is sent to the continuous heat preservation screw, and the heat preservation reaction is carried out at 85°C for 1 hour;

[0080] 4) Add a mixed solution of acetic acid and water each accounting for 50% to the material after heat preservation treatment, and dilute the material to a concentration of 90g / L. ...

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Abstract

The invention discloses a catalytic liquid for straw biomass and a continuous treatment process. The catalytic liquid is composed of formic acid, acetic acid, hydrogen peroxide, an oxidation catalyst and water. The decomposition catalytic liquid of some examples of the present invention introduces an organic small molecule catalyst as a pretreatment co-catalyst to increase the dissolution rate of lignin under mild conditions, avoid the condensation of lignin under conventional high-temperature cooking conditions, and effectively cut off the lignin. LCC bonds between hemicelluloses are extracted to obtain high-purity lignin with intact structure. Under the same pretreatment conditions, the lignin separation yield increased by 30%, and the hemicellulose hydrolyzate yield increased by 20%.

Description

technical field [0001] The invention relates to the fields of biochemical industry and bioenergy, in particular to a catalytic liquid and a continuous treatment process for straw-like biomass. Background technique [0002] Fossil resources are non-renewable resources, and their development and utilization will cause irreversible damage to the environment such as air, soil and water resources, especially the El Niño weather caused by the intensification of the greenhouse effect. Due to the shortage of fossil resources in my country, the per capita energy is far below the world average level, and my country has become the world's largest importer of crude oil, and its dependence on foreign countries is serious, which seriously affects the sustainable development of my country's economy and society. Therefore, the development of green and sustainable resources and energy has been highly valued by the scientific community and the government. [0003] my country is rich in bioma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02B01J35/12C07G1/00C08B37/14C08H7/00D21B1/16B01J35/27
CPCB01J31/006B01J31/0235B01J31/0247B01J31/0244C07G1/00D21B1/16C08B37/00C08H6/00B01J35/27
Inventor 朱晨杰应汉杰单军强欧阳平凯陈彦君唐成伦庄伟李明陈勇沈涛
Owner NANJING TECH UNIV