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Prepared high hardness pulp using grass kind plant as raw material and preparation method thereof

A plant raw material, high hardness technology, applied in non-woody plant/crop pulp, fiber raw material processing, pulping with inorganic alkali, etc., can solve the problems of high viscosity of black liquor, high energy consumption, and difficult recovery.

Active Publication Date: 2007-12-19
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. Due to the high content of silicon and carbohydrates in the raw materials, the viscosity of the black liquor is high and the recovery is difficult
4. Grasses now contain a large number of miscellaneous cells, which pose a series of hazards to papermaking
[0011] The second issue of Chemical Industry Times in 2002 published an article entitled "Research on Straw Low-pressure and Low-temperature Pulping". The article used rice straw as raw material to obtain bleached pulp through the steps of pre-impregnation, cooking, washing and sieving, and bleaching. Keep warm for up to 3.5 hours, requiring a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] After the dry preparation, the rice straw is mixed and impregnated with a 9% sodium hydroxide solution in the dipping screw machine through the dipping screw machine, and then sent into the steaming ball. 0.6%, the liquid ratio is 1:3, the steaming ball is idling for 20 minutes after the straw is filled; after that, the steam is heated once to raise the temperature to 100°C, and the temperature is kept at this temperature for 30 minutes, and then the steam is released for 20-30 minutes. Start steaming for the second heating, raise the temperature for 30 minutes to 165°C, and keep it warm for 80 minutes; before spraying, add black liquor to the steaming ball to dilute, and at the same time keep the pressure at 0.75MPa for spraying. At this time, the hardness of the slurry is A potassium permanganate value of 20 is equivalent to a kappa value of 32, the pH value at the end of cooking is 11, and the residual alkali concentration in the black liquor is 12g / l. The yield of t...

Embodiment 2

[0065] After the dry preparation, the wheat straw is sent into the steaming ball, and the caustic soda solution of 10% of the absolute dry raw material is added to the steaming ball, the addition of anthraquinone is 0.7% of the absolute dry raw material, the liquid ratio is 1:4, and the wheat straw is filled. Afterwards, the steaming ball is idling for 20 minutes; after that, heat up to 110°C with steam, keep warm at this temperature for 20 minutes, and let off steam for 20-30 minutes, start steaming for the second heating, and raise the temperature for 30 minutes to reach the temperature 168°C, keep warm for 90 minutes; before spraying, add black liquor to the steaming ball to dilute, and at the same time keep the pressure at 0.75MPa for spraying, at this time the hardness of the pulp is potassium permanganate value 18, which is equivalent to kappa value 30 , the pH value at the end of cooking is 12, and the residual alkali concentration in the black liquor is 12g / l. The yiel...

Embodiment 3

[0067] The rice straw after the dry preparation is passed through the dipping screw machine, and in the dipping screw machine, it is mixed with a 12% sodium hydroxide solution and a black liquor mixture in the dipping screw machine, and then sent into a steaming ball, and the anthraquinone addition is 0.8% of absolute dry raw material, liquid ratio 1:2.5, steam ball idling for 20 minutes after the straw is filled; after that, heat up the temperature once with steam, raise the temperature to 120°C, keep warm at this temperature for 40 minutes, and then let off steam 20-30 minutes, the second heating starts to pass steam, the temperature rises for 30 minutes to 173°C, and the temperature is kept for 90 minutes; before spraying, add black liquor to the steaming ball to dilute, and at the same time keep the pressure at 0.75MPa for spraying. The hardness of the pulp is 16 for potassium permanganate, which is equivalent to 23 for the Kappa value, the pH value at the end of cooking is...

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PUM

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Abstract

The present invention discloses a method for preparing high-hardness pulp by using graminoid plant as raw material and its cooking process. The hardness of said high-hardness pulp is equal to Kappa number 24-50. The described cooking method includes the following steps: preparing graminoid plant raw material, soaking said raw material, feeding said raw material into a cooker, adding cooking liquor into said cooker, introducing steam to make heating operation to attain the requird pressure, then heat-insulating to the required time.

Description

technical field [0001] The invention relates to a high-hardness pulp, more specifically, to a high-hardness pulp prepared from grass plants and a preparation method thereof. Background technique [0002] The methods of producing pulp from plant fibers are: chemical method, mechanical method, chemical mechanical method. Chemical pulping is the use of chemical action to dissociate raw materials into pulp by removing certain components in plant fiber raw materials. It is the most widely used pulping method. In chemical cooking, it is divided into lime method, caustic soda method, and anthracene method. Quinone-caustic soda method, sulfate method, sulfite method cooking. [0003] The sulfite method in the prior art is raw material with plant fiber, and its technological process is to carry out material preparation at first, will carry out the raw material of the production pulp of pretreatment and pack into steaming ball, vertical pot and continuous steaming (cooking pot, verti...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21H11/06D21C3/14D21C7/00D21C3/02
Inventor 李洪法宋明信陈松涛杨吉慧宋建军赵淑晶
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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