Whole black liqucd large liqucd rate cercal grass cooking technology with digester

A technology of grasses and cooking pots, which is applied in the field of cooking process of grasses pulp, can solve the problems of high carbohydrate content, high viscosity of black liquor, difficult recovery, etc., achieve light black liquor, high concentration, and reduce pollution Effect

Active Publication Date: 2005-03-23
高唐绿荫环保科技有限公司
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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
[0013] In summary, the prior art does not have a set of practicable s

Method used

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  • Whole black liqucd large liqucd rate cercal grass cooking technology with digester
  • Whole black liqucd large liqucd rate cercal grass cooking technology with digester
  • Whole black liqucd large liqucd rate cercal grass cooking technology with digester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Wheat straw is selected as the raw material, prepared by dry and wet methods, and after cutting, screening, dust removal, wet washing and rubbing, the water is removed. At this time, the length of the wheat straw slices is about 20mm.

[0065] Then pre-impregnate the wheat straw, impregnate the wheat straw with 85°C black liquor containing a certain alkali concentration, the liquid ratio is controlled at 1:4.8, the addition of caustic soda (NaOH) is about 30 g / L, and the impregnation is under normal pressure for 30 minutes .

[0066] The black liquor used in the pre-soaking treatment is obtained from the waste liquor discharged from wheat straw during the pulping and cooking process. The Baume degree of the black liquor is 12.22°Be' at 20°C, and the solid content concentration is 16.52%.

[0067] Put the pre-impregnated wheat straw into 50m through the pot loader 3 In the cooking pot, the average pot capacity of 1 cubic meter is 125 kg, and then the first stage of cook...

Embodiment 2

[0078] The technological process is the same as in Example 1, except that the grass fiber raw material used is reed, and during the pre-impregnation process, the temperature of the black liquor is 95°C, the amount of caustic soda is controlled at 34 grams per liter, and the liquid ratio is 1: 4.5. Immersion at atmospheric pressure for 60 minutes.

[0079] The Baume degree at 20°C of the black liquor used in the pre-dipping treatment is 13.15°Be', and the solids concentration is 17.58%.

[0080] After pre-impregnation, the inner pot capacity of the cooking pot is an average of 145 kg per cubic meter. During the first-level cooking and washing, it is cooked for 60 minutes at a temperature of 120 ° C. The pH value of the high-concentration black liquor discharged from the first-level cooking and washing is 13.3. , the residual alkali is 9.8g / L, the Baume degree is 16.88°Be'(20°C), the solid content concentration is 22.5%, and the COD is 235,000 mg / L.

[0081] In the secondary co...

Embodiment 3

[0083] The technological process is the same as that in Example 1, except that the grass fiber raw material used is Arundis, during the pre-impregnation treatment, the temperature of the black liquor is 95°C, the amount of caustic soda is controlled at 32 g / L, and the liquid ratio is 1:5.5 , impregnated at atmospheric pressure for 80 minutes.

[0084] The Baume degree of the black liquor used in the pre-dipping treatment is 11.75°Be' at 20°C, and the solid content concentration is 18.86%.

[0085] After pre-impregnation, the inner pot capacity of the cooking pot is an average of 150 kg per cubic meter. During the first-stage cooking and washing, it is cooked for 40 minutes at a temperature of 100°C. The pH value of the high-concentration black liquor discharged from the first-stage cooking and washing is 11.4. , the residual alkali is 5.6g / L, the concentration is 15.76°Be'(20°C), the solid content concentration is 24.351%, and the COD is 229,000 mg / L.

[0086] In the secondar...

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Abstract

The invention relates to a whole black liquor large liquor rate cercal grass cooking technology with digester, comprising the following steps: after stocking, preimpregnating the grass raw fiber; loading the preimpregnated raw material into cooking equipment to perform first stage boiling washing to discharge black liqucd of high concentration to obtain straw pulp intermediate product; supplying cooking liquor to the said cooking equipment, and second stage boiling washing the straw pulp intermediate product, and then straw pulp being obtained through washing; repective cycle operating ryegrass large liquor rate displacement cooking and ryegrass large liquor rate displacement cooking black liquor and implementing grading displacement cooking in cooking pan, the research and design of cooking pan grading displacement cooking technology and the corresponding device design and parttern selection being done. The said technology can be used in rebuilting the domestic ryegrass pulp mill. The pulp strength can be enhanced and the quality of the waste liquor is improved. The invention benifits for recovery processing and reduces the discharge of the waste liquor and BOD, COD.

Description

technical field [0001] The invention relates to a pulp cooking process, more specifically, to a grass pulp cooking process. Background technique [0002] The methods of producing pulp from plant fibers are: chemical method, mechanical method and chemical mechanical method. In the chemical method, it is divided into lime method, caustic soda method, anthraquinone-caustic soda method and sulfate method. [0003] The caustic soda method in the prior art takes plant fiber as raw material. The process is to prepare the raw materials first, put the pretreated raw materials for pulp production into steaming balls or vertical pots (cooking pots, vertical cooking pots) and other equipment, and then add chemicals such as sodium hydroxide for gas phase cooking. It is to produce qualified pulp directly through steam heating and heat preservation. [0004] The pretreatment described in the prior art includes dry pretreatment, wet pretreatment, and dry-wet pretreatment. Dry pretreatme...

Claims

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Application Information

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IPC IPC(8): D21C1/00D21C3/00D21C3/22D21C5/00
Inventor 曹振雷陈松涛宋明信杨吉慧孙利军路敦所
Owner 高唐绿荫环保科技有限公司
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