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Preparation method for high-purity lignin

A lignin and high-purity technology, applied in the field of biomass resource conversion and utilization, can solve the problems of resource waste, environmental pollution, and limit the high-value utilization of lignin, and achieve the effect of reducing molecular weight distribution and high reactivity

Active Publication Date: 2016-03-30
ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, at present, only 2% of the lignin obtained from the fuel ethanol process and papermaking industry is converted into valuable industrial products, and most of them are burned or discharged directly, which not only causes waste of resources but also seriously pollutes the environment
Industrial lignin, especially the lignin raw material obtained from papermaking black liquor, contains structural polysaccharides covalently bonded to lignin and inorganic salt ions introduced by alkali treatment, which prevents the purity of lignin from being improved and limits the high-value utilization of lignin

Method used

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  • Preparation method for high-purity lignin

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Effect test

Embodiment 1

[0037] Embodiment 1, the preparation of high-purity lignin

[0038] use as figure 1 The device shown is prepared, and the specific process is as follows: put 5 g of the lignin raw material that has been dried and pulverized into a 40-60 mesh alkali-extracted lignin into the reactor 2, and the neutral desiccant with a pH of 7.0 is prepared in the container 1 where the electrogenerated functional water is placed. Ionized water, adjust the flow rate to be 25mL / min, inject the reactor 2 through the high-pressure pump 6, the pressure of the reaction tube in the reactor 2 is 2MPa, then immerse the reaction tube into the sand bath 4 with a temperature of 180°C, when the reaction tube Start timing when the outlet temperature reaches 180°C. After 10 minutes of reaction, quickly take out the reaction tube and move it to a container filled with cold water to rapidly cool down to terminate the reaction. The reaction tube is taken out and placed in the water bath 5 for cooling. During th...

Embodiment 2

[0040] Embodiment 2, the preparation of high-purity lignin

[0041] use as figure 1 The device shown is prepared, and the specific process is as follows: put 5 g of corn stalk raw material that has been dried and pulverized into 40-60 meshes into the reaction tube of reactor 2, and the acidic aqueous solution with a pH of 2.17 is prepared in container 1 where electrogenerated functional water is placed, Adjust the flow rate to 25mL / min, inject it into the reactor 2 through the high-pressure pump 6, the pressure in the reaction tube is 2.5MPa, then immerse the reaction tube in the sand bath 4 with a temperature of 240°C, when the outlet temperature of the reaction tube reaches 240°C After 6 minutes of reaction, the reaction tube was quickly taken out, and moved to a container equipped with cold water to rapidly cool down to terminate the reaction. The reaction tube is taken out and placed in the water bath 5 for cooling. During the reaction, the effluent solution (i.e. the su...

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Abstract

The present invention discloses a preparation method for high-purity lignin. The method comprises the steps of placing a biomass raw material or a lignin raw material in a reactor, and adding water or an acidic aqueous solution into the reactor; performing hydrolysis reaction while adding the water or acidic aqueous solution; collecting a dissolved solution in the reactor during the hydrolysis reaction, cooling the reactor and terminating the reaction; cooling the solution, and then collecting the precipitate in the solution so as to obtain the high-purity lignin. According to the preparation method, the lignin raw material is hydrolyzed under a high-temperature and high-pressure condition, so that the lignin is dissolved out and separated out, the organic solvent is not needed to be added in the process, and the high-purity lignin can be extracted.

Description

technical field [0001] The invention relates to a method for preparing high-purity lignin, which belongs to the field of transformation and utilization of biomass resources. Background technique [0002] The modern civilized society based on modern industry has almost consumed the ore resources such as coal and oil accumulated by the earth after 1 billion years in 200-300 years. The use of a large amount of ore resources has made the country's energy security and economic security unable to be guaranteed. At the same time, it has also made China one of the largest emitters of greenhouse gases and is facing enormous international pressure to reduce emissions. Therefore, it is imminent to develop lignocellulose, the largest renewable resource in the earth's ecosystem, to replace ore resources. Lignocellulose is the only ideal energy and organic carbon resource that can be relied on for a long time, enough to support the survival and development of human beings, and the only l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
Inventor 孙君社裴海生陈洲王民敬
Owner ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
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