Process and device for pulping by reversely extracting grass raw materials

A technology of countercurrent extraction and grasses, which is applied to pulping of cellulose raw materials, fiber raw materials treatment, pulping with organic solvents, etc., can solve the problems of conflicting main power factors, and achieve high profits, simple recovery technology, and low water consumption. less effect

Active Publication Date: 2014-12-31
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as we all know, many straw pulp mills in my country still use traditional pulping methods, which put great pressure on the environment and energy, which is contrary to the main driving force for the development of pulping

Method used

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  • Process and device for pulping by reversely extracting grass raw materials
  • Process and device for pulping by reversely extracting grass raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]A countercurrent extraction and pulping method for grass raw materials, which uses ethanol-water-hydrogen peroxide five-stage countercurrent pulping for reed raw materials, and the process steps are as follows:

[0044] a. Cut the reed raw material into grass sections and put them into a pressure vessel, perform one-stage extraction according to the liquid ratio (g:mL) of 1:8, the extract used in the first-stage extraction is the second-stage extraction waste liquid, and recover ethanol by adding Control the volume concentration of ethanol to 50%, extracting temperature at 170°C, and extracting time for 150 minutes. After the first stage of extraction is completed, the extraction waste liquid is released into the flash tank to recover part of the ethanol, and the other waste liquid is sent to the recovery system. The slurry in the pressure vessel The material is subjected to two-stage extraction;

[0045] b. The second-stage extraction is carried out with the third-stage...

Embodiment 2

[0079] A method for countercurrent extraction and pulping of grass raw materials, using ethanol-water-hydrogen peroxide five-stage countercurrent pulping for wheat straw raw materials, the process steps are as follows: the process operation is the same as that of Example 1, and the process conditions are as follows:

[0080] One-stage extraction: temperature 175°C, time 150min, liquid ratio 1:7, ethanol concentration 55%;

[0081] Two-stage extraction: temperature 150°C, time 60min, liquid ratio 1:7, ethanol concentration 55%;

[0082] Three-stage extraction: temperature 130°C, time 60min, liquid ratio 1:7, ethanol concentration 55%, hydrogen peroxide dosage 1.0%;

[0083] Four-stage extraction: temperature 80°C, time 30min; liquid ratio 1:4;

[0084] Five-stage extraction: temperature 80°C, time 30min, liquid ratio 1:4.

[0085] The obtained pulp quality is listed in Table 2.

[0086] Table 2 Pulping effect of five-stage countercurrent extraction of wheat straw

[0087] ...

Embodiment 3

[0089] A method for countercurrent extraction and pulping of grass raw materials, using ethanol-water-hydrogen peroxide five-stage countercurrent pulping for wheat straw raw materials, the process steps are as follows: the process operation is the same as that of Example 1, and the process conditions are as follows:

[0090]One-stage extraction: temperature 165°C, time 180min, liquid ratio 1:8, ethanol concentration 50%;

[0091] Two-stage extraction: temperature 150°C, time 80min; liquid ratio 1:8, ethanol concentration 50%;

[0092] Three-stage extraction: temperature 130°C, time 60min, liquid ratio 1:8, ethanol concentration 50%, hydrogen peroxide dosage 1.5%;

[0093] Four-stage extraction: temperature 80°C, time 30min, liquid ratio 1:5.

[0094] Five-stage extraction: temperature 80°C, time 30min, liquid ratio 1:5.

[0095] The obtained pulp quality is listed in Table 3.

[0096] Table 3 Pulping effect of reed five-stage countercurrent extraction

[0097] Fin...

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Abstract

The invention discloses a process and a device for pulping by reversely extracting grass raw materials. The process for pulping by reversely extracting grass raw materials utilizes an ethanol-water-superoxide multistage mode. In a boiling stage, the volume concentration of ethanol in an extract is controlled to be from 40% to 65%, the temperature of different segments is controlled to be 90-190 DEG C, the extracting time is controlled to be 40-180 minutes, the liquid ratio is controlled to be 1:4-1:10, and 0.5-5% of superoxide by weight is added to a tail segment of the boiling stage and serves as an assistant. In a pulp washing stage, the temperature of different segments is controlled to be 70-100 DEG C, the extracting time is controlled to be 30-60 minutes, and the liquid ratio is controlled to be 1:3-1:6. The device for pulping by reversely extracting grass raw materials mainly comprises an extractor, a heat exchanger, a liquid storage tank, a flash bucket, a condenser, an ethanol liquid tank, a circulation pump and the like. The process is suitable for the pulping industry, has the advantages of wide adaptability to grass raw materials, low boiling temperature, good pulping quality, easiness in pulp bleaching, low investment, easiness in recovery of high-additional-value byproduct from waste liquid and the like, and can realize pulping cleanly.

Description

technical field [0001] The invention relates to a countercurrent extraction pulping process and device for grass raw materials, and relates to the technical field of pulping and papermaking engineering. Background technique [0002] With the rapid development of my country's economy, the demand for pulp and paper is increasing rapidly. However, as we all know, many straw pulp mills in my country still use traditional pulping methods, which bring great pressure to the environment and energy, which is contrary to the main driving force for the development of pulping. Therefore, my country will restrict the establishment of traditional straw pulp production lines in the "Pulp and Paper 'Eleventh Five-Year' Plan", and vigorously develop the clean production technology of straw pulp in the "Pulp and Paper 'Twelfth Five-Year' Plan". . In view of this, finding a new pulping method that can effectively recover useful substances such as lignin, better protect the environment, and ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/20D21C3/22D21H11/12
Inventor 平清伟张健尉志苹石海强李娜牛梅红李海洋
Owner DALIAN POLYTECHNIC UNIVERSITY
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