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Impregnation pretreatment technology of raw material used in soda process pulp making

A caustic soda pulping and pretreatment technology, applied in the direction of fine split raw material pretreatment, fiber raw material treatment, inorganic alkali pulping, etc., can solve the problems of high carbohydrate content, influence of pulping process, high viscosity of black liquor, etc. , to achieve the effect of easy beating, good drainage and high whiteness

Active Publication Date: 2007-05-30
高唐绿荫环保科技有限公司
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  • 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. Grass fibers contain a large number of miscellaneous cells, which pose a series of hazards to papermaking
[0010] The researchers of the present invention have found that the prior art does not describe the use of black liquor, especially the black liquor that can be recycled according to the present invention, and the black liquor used for pretreatment according to the present invention is not only used for pretreatment on, and have an important impact on the whole pulping process, in view of this, the present invention is proposed

Method used

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  • Impregnation pretreatment technology of raw material used in soda process pulp making

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Embodiment 1

[0045] In this example, for the dipping treatment process used in alkaline pulping, 25 cubic meters of steamed balls are used as the cooking vessel, and the length of the preliminarily treated wheat straw is 2-3 cm, and 4.8 tons of dry wheat straw is placed in the dipping screw machine and added Heated impregnating liquid, the impregnating liquid is composed of caustic soda and No. 2 black liquor. The concentration of adding alkali is the NaOH (sodium hydroxide) solution of the percentage of 14% absolute dry grass weight, the content of sodium hydroxide in the steeping liquid is 28 g / liter, the weight of the dry wheat straw amount (T) and the total liquid amount of the steeping liquid The ratio is 1:3.5. After adding the impregnating liquid wheat straw into the impregnating screw machine, rotate and impregnate under normal pressure for 0.25 hours, so that the impregnating liquid can fully contact with the raw materials, so that the raw materials can be impregnated evenly. Afte...

Embodiment 2

[0047] The equipment used in the present embodiment and process condition are basically the same as embodiment 1, only difference is that the concentration of adding alkali is 13% absolute dry grass weight percent, NaOH content 35 g / liter in the steeping liquid, absolute dry wheat straw amount (T) and The weight ratio of the total liquid volume of the soaking liquid is 1:3.9, and the impregnating liquid is rotated and soaked for 0.4 hours under normal pressure. The soaking liquid is heated to 95 degrees and mixed with the wheat straw, and kept for 30 minutes by rotating.

Embodiment 3

[0049] The equipment and process conditions used in this embodiment are basically the same as in Example 1, except that the concentration of alkali added is 15% by weight percentage of absolute dry grass, and the content of sodium hydroxide in the soaking liquid is 32 grams per liter. The weight ratio of the amount (T) to the total liquid volume of the soaking liquid is 1:4.2, and the dipping is rotated under normal pressure for 0.3 hours, and the soaking liquid is heated to 85 degrees and mixed with wheat straw, and rotated for 40 minutes.

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Abstract

The invention relates to paper stuff manufacturing process by using grain grass fiber raw material, more concretely, a method of pre-impregnation treatment for raw material. The method uses grain grass fiber as raw material, after first treatment, impregnates the raw material by using heated impregnation liquor. The method cyclically utilizes black liquor thereby reducing environmental pressure caused by the black liquor treatment. Because of the impregnation treatment, fiber can be easily separated from the thick black liquor at first boiling.

Description

technical field [0001] The present invention relates to the process of producing pulp with non-wood fiber raw materials, more specifically, the method for pretreatment of raw materials in the process of producing pulp with grass fibers. Background technique [0002] The methods of producing pulp from plant fibers are: chemical method, mechanical method, chemical mechanical method. In the chemical method, it is divided into lime method, caustic soda method, anthraquinone-caustic soda method and sulfate method. 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. [0003] The pretreatment described in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C1/10D21C3/02
Inventor 杨吉慧路敦所宋明信陈松涛孙利军
Owner 高唐绿荫环保科技有限公司
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