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Method for obtaining plasm from biomass comprising lignocellulose

A technology of lignocellulose and biomass, which is applied in pulping of cellulose raw materials, processing of fiber raw materials, pulping with inorganic alkali, etc., can solve the problems of not having a chemical recovery system, etc.

Inactive Publication Date: 2015-04-01
齐卢姆有限公司专利第二两合公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most straw pulping units do not have chemical recovery systems due to problems associated with high silicate content in the alkaline digestion liquor

Method used

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  • Method for obtaining plasm from biomass comprising lignocellulose
  • Method for obtaining plasm from biomass comprising lignocellulose
  • Method for obtaining plasm from biomass comprising lignocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Monoethanolamine (MEA) is used as the alkanolamine throughout the process. From the following comprehensive evaluation, the basic point here is that monoethanolamine is mixed with water as a decomposition medium, and after obtaining the puree or slurry, monoethanolamine is returned to the system again. Concrete steps are carried out as follows, wherein refer to attached flowchart ( figure 1 ).

[0039] According to a preferred embodiment, the plant for carrying out the method according to the invention comprises a digester 2 , a separation device 8 , a delignification unit 10 and a bleaching unit 13 . The apparatus also includes a distillation apparatus 11 , a water container 5 , and an MEA container 4 . The individual elements of the device are interconnected by lines. The arrangement and connection of the individual elements to one another are specified in the following description of the method:

[0040]The digester 2 has a biomass feed line 1 and a catalyst feed...

Embodiment 2

[0045] Embodiment 2 (the influence of temperature in the MEA decomposition of wheat straw)

[0046] The basic premise to reduce the decomposition of MEA during the decomposition process is to lower the cooking temperature. Therefore, the decomposition temperature varies between 165°C and 130°C. Additional conditions and results used are listed in Table 1. For comparison, soda decomposition and soda / anthraquinone (AQ) decomposition, which is a standard method for decomposition of straw on an industrial scale, were carried out. It has been shown that the decomposition temperature can be lowered up to 150°C (WS 10; WS3-5) without reducing the delignification efficiency (κ value) of the system and the yield is at a high level. Compared to conventional soda splitting or soda / AQ splitting, the yield was increased by up to 12% / feedstock, which meant about a quarter more slurry yield from the same amount of feedstock. MEA pulp has very low brightness compared to soda pulp (15% ISO ...

Embodiment 3

[0056] Embodiment 3 (replacing a part of MEA in the decomposition with water)

[0057] In order to further reduce the specific MEA consumption in the decomposition, the MEA is gradually replaced with water. The results are summarized in Table 2 below. Reducing the content of MEA in the decomposition solution to 50% had little negative effect on the decomposition. Under otherwise identical conditions, the kappa value increased only by 2.5 units (WS6; WS16, 17). When the MEA content of the decomposition solution was reduced to 37.5%, the κ value increased by one unit (WS23), and it suddenly increased by 16 units at a MEA content of 25%. A sharp rise (WS18). Based on the results described, MEA-H 2 O operates in a 50:50 ratio.

[0058] Table 2

[0059]

[0060] Continued Table 2

[0061]

[0062] Remark:

[0063] W = water

[0064] O = oxygen

[0065] In the case of MEAS11, the use of oxygen after cooking or during the cooling

[0066] In the case of MEAS12, oxyge...

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Abstract

The invention relates to a method for obtaining cellulose by separating lignin from a biomass comprising lignocellulose in the form of plants or plant parts, wherein the biomass comprising lignocellulose is solubilized in a boiler in an alkaline medium comprising alkanol amine, and dissolved lignin is separated from the resulting raw cellulose. Said method is characterized in that the biomass comprising lignocellulose is not from a wood source, and is solubilized at a temperature of less than approximately 170° C. in a solubilizing agent based on alkanol amine and water, wherein the weight ratio of alkanol amine to water is set to 80:20 to 20:80, and raw cellulose thus produced is separated from the waste lye using a typical method. Said method is particularly advantageous for obtaining cellulose from annual plants, particularly wheat straw. The method is advantageously improved in that the solubilization takes place in the presence of a catalyst, particularly of anthrachinon. An advantageous bleaching process may be performed subsequently. Said method is characterized by great economic efficiency, particularly due to the high reclamation rates of the alkanol amine used, and leads to lower environmental impact in wastewater, and to reduced disposal costs. The design of the method leads to a greater yield of cellulose and largely prevents degradation of alkanol amine, particularly monoethanol amine (MEA).

Description

technical field [0001] The present invention relates to a process for obtaining a slurry by separating lignin from lignocellulosic biomass, especially from straw and other fiber-providing non-woody plants, wherein the lignocellulosic Alkanolamines in an alkaline medium are decomposed in a digester, and dissolved lignin and low-molecular carbohydrates are separated from the obtained puree. Background technique [0002] In the past 30 years, pulping from non-woody biomass has been increasing worldwide. Worldwide, the fibrous mass that does not originate from wood as a starting material is close to 12%. Wheat is cultivated on all continents, so its straw is widely used for pulping. According to United Nations FAO statistics (2007), the world's wheat production exceeds 600 million tons. Of which Iran alone produced 15 million tons. About half of the wheat straw produced is used on the farm. The other half is burned or plowed into the soil. Based on these data it can be ext...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/20D21C3/22
CPCD21C11/0007D21C3/20D21C3/222D21C5/00D21C3/02
Inventor R·帕特A·克瑞普
Owner 齐卢姆有限公司专利第二两合公司