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Method for straw pulping and coal water slurry dispersing agent

A technology of coal-water slurry and straw, applied in the field of green utilization of agricultural and forestry waste resources, can solve the problems of pollution, high production cost and high equipment requirements

Pending Publication Date: 2021-10-01
吉林省格瑞节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ultrafiltration process requires high equipment, resulting in high production costs. Only by modifying the black liquor or compounding other agents and directly using it as a dispersant for coal-water slurry can achieve better economic benefits and effectively solve the pollution problem in the pulping process

Method used

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  • Method for straw pulping and coal water slurry dispersing agent
  • Method for straw pulping and coal water slurry dispersing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 The steps and conditions of a green method for pulping puffed rice straw are as follows: add 20 g of puffed rice straw, 160 g of water and 3 g of sodium sulfite to the hydrothermal kettle, set the heating time to 40 minutes, and the holding time to 50 minutes. Minutes, the holding temperature is 150°C, cool after the reaction, filter and collect the filter residue and filtrate respectively, the filter residue is graded and washed to 90% water content, and ball milled at 650 rpm for 2 hours. Add sodium sulfite: acetone to the filtrate at a ratio of 0.5:1, and react at 85°C for 5 hours. The product after the completion of the reaction was added to lignite coal powder at 2%, and stirred at 1200 rpm for 20 minutes. The calculated pulp yield relative to straw is 44%, the Kappa value is 26, and the ash content is 4%. The concentration of coal water slurry is 60.5%, the viscosity is 1400mPa•s, and no hard precipitation occurs after standing at room temperature for 7...

Embodiment 2

[0031] Example 2 The steps and conditions of a green method for pulping puffed rice straw are as follows: add 20 g of puffed rice straw, 140 g of water and 2 g of sodium sulfite to the hydrothermal kettle, set the heating time to 60 minutes, and the holding time to 60 minutes , the holding temperature is 150° C., cooling after the reaction, and filtering to collect the filter residue and filtrate respectively. The filter residue was graded and washed with water to 90% water content, and ball milled at 650 rpm for 2 hours. Add sodium sulfite: acetone to the filtrate at a ratio of 0.6:1, and react at 86°C for 5 hours. The product after the completion of the reaction was added to lignite coal powder at 2%, and stirred at 1200 rpm for 20 minutes. The calculated pulp yield relative to straw is 43%, the Kappa value is 23, and the ash content is 4%. The concentration of coal-water slurry is 64%, the viscosity is 1394mPa•s, and no hard precipitation occurs after standing at room tem...

Embodiment 3

[0032]Example 3 The steps and conditions of a green method for pulping puffed rice straw are as follows: add 20 g of puffed rice straw, 160 g of water and 2 g of sodium sulfite to the hydrothermal kettle, set the heating time to 80 minutes, and the holding time to 40 minutes, the holding temperature was 160°C, cooled after the reaction, and filtered to collect the filter residue and filtrate respectively. The filter residue was graded and washed with water to 90% water content, and ball milled at 650 rpm for 2 hours. Add sodium sulfite: acetone to the filtrate at a ratio of 0.6:1, and react at 89°C for 5 hours. The product after the completion of the reaction was added to lignite coal powder by 5%, and stirred at 1200 rpm for 20 minutes. The calculated pulp yield relative to straw is 42%, the Kappa value is 22, and the ash content is 3.5%. The concentration of coal-water slurry is 64.8%, the viscosity is 1105mPa•s, and no hard precipitation occurs after standing at room temp...

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Abstract

The invention discloses a straw pulping method, and particularly relates to the technical field of straw pulping. The method comprises the following steps: puffing crushed straw by a machine, removing lignin by adopting a hydrothermal sulfonation method, filtering after reaction, respectively collecting filter residues and filtrate, carrying out ball milling on the filter residues to prepare paper pulp, and sulfonating and condensing the filtrate to prepare the coal water slurry dispersing agent. The yield of the paper pulp relative to straw raw materials is 40-44%, the ash content of the paper pulp is lower than 5%, the kappa number is lower than 26, and the requirements of raw materials such as corrugated paper and paper-plastic materials are met. The concentration of lignite coal water slurry prepared from the coal water slurry dispersing agent is 60-65%, no hard precipitate is generated after the lignite coal water slurry is stood at room temperature for 7 days, and the viscosity is lower than 1,500mPa.s. The method is easy to operate, pollution in the traditional straw pulp production process is reduced, and the straw utilization method has wide application prospects.

Description

technical field [0001] The invention relates to the field of green utilization of agricultural and forestry waste resources, and relates to a process plan for preparing paper pulp and coal-water slurry dispersant respectively through hydrothermal sulfonation of rice straw. Background technique [0002] China's annual output of rice is 210 million tons, followed by a large number of rice straws that cannot be used for high-value use and even cause environmental pollution. At present, rice straw is mainly used as a source of energy and a source of feed for aquaculture. However, the ash content of rice straw is high (15-20%), which will affect the heat transfer efficiency and increase the number of slag removal operations when it is burned in large quantities; on the other hand, the crude protein content of rice straw is low (only 1.8%), and the application of feed is defective. . However, the use methods in other directions, such as building fillers, are difficult to solve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32D21C3/06
CPCC10L1/326D21C3/06
Inventor 张龙傅博进崔瑛娜
Owner 吉林省格瑞节能科技有限公司
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