In ball washing classifying digesting technology

A process, cooking liquor technology, applied in washing/replacing pulp treatment liquor, raw material pretreatment for fine splitting, textiles and papermaking, etc., can solve the problems of papermaking hazards, difficult recycling, and high viscosity of black liquor

Active Publication Date: 2007-05-30
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
This document uses white liquor external presoaking without disclosing specific process parameters

Method used

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  • In ball washing classifying digesting technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 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 1:2.8. 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

[0055] 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 1:3.6, 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

[0057] 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 steeping liquid is 32 grams per liter. The weight ratio of the amount of wheat straw (T) to the total amount of soaking liquid is 1:3.2, and the soaking is rotated and soaked under normal pressure for 0.3 hours. The soaking liquid is heated to 85 degrees and mixed with wheat straw, and kept for 40 minutes while rotating.

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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 using black liquor as raw material for primary and secondary boiling liquor for cyclic utilization. The primary boiling is implemented under lower temperature, and while using secondary boiling liquor to displace and discharge the thick black liquor, the fiber in spherical digester which has subjected to the primary boiling is washed, and subjects to the secondary boiling in high temperature, and then pulp is subject to countercurrent washing. The process is used in pulping, and the black liquor can be periodic used thereby reduce environment pollution. Black liquor that per ton of pulp discharges can reduce 50%, and water can be saved for 50%.

Description

technical field [0001] The invention relates to a process for producing pulp with non-wood fiber raw materials, more specifically, an in-ball washing and graded cooking process for producing pulp with grass fibers. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00D21C3/22D21C3/02D21C1/00D21C9/02
Inventor 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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