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Method for preparing bleached chemical pulp by using grass type plants as raw materials

A technology for plant raw materials and grasses is applied in the field of preparing bleached chemical pulp, which can solve the problems of high viscosity of black liquor, high energy consumption and high carbohydrate content, and achieve the effects of high yield, dust reduction and production cost reduction.

Active Publication Date: 2012-01-25
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

[0065] The wheat straw raw material removes the leaves, ears, and rotten parts in the forage, and the wheat straw raw material with a length of 300-500mm enters from the entrance of the hammer crusher at a feeding speed of 0.8m / s through a belt conveyor. The speed of the machine is 500rpm. When the raw materials enter the hammer crusher, they are cut and kneaded, and the wheat straw raw materials with a length of 20-40mm are discharged from the outlet of the hammer crusher. The hammer crusher is a hammer crusher for ore dressing or bark in the prior art. The wheat straw raw material discharged from the hammer crusher enters the cyclone dust collector, and the air volume is 30000m 3 / h, dust removal treatment is carried out under the condition of wind pressure of 200mm water column. The wheat straw raw material coming out from the dust collector enters the cylinder sieve for screening. During screening, the rotation speed of the cylinder sieve is 19r / min, and the inclination a...

Embodiment 2

[0068] Remove the leaves, ears, and rotten parts of the straw raw material from the forage, and the straw raw material with a length of 500-800mm enters from the entrance of the hammer crusher with a feeding speed of 0.6m / s through a belt conveyor. The rotating speed is 600rpm. After the raw material enters the hammer crusher, after cutting and kneading, the straw raw material with a length of 30-50mm is discharged from the outlet of the hammer crusher. The hammer crusher is a hammer crusher used for ore dressing or bark in the prior art. The straw raw material discharged from the hammer crusher enters the cyclone dust collector, where the air volume is 35000m 3 / h, dust removal treatment is carried out under the condition of wind pressure of 220mm water column. The straw raw material coming out from the dedusting machine enters the cylinder sieve for screening. During screening, the cylinder sieve rotating speed is 20r / min, and the inclination angle is 10°. The cylindrical ...

Embodiment 3

[0071] The wheat straw and the reed are mixed according to 1:1, and then steamed by the ammonium sulfite method, which is carried out in the steaming ball, and the cooking agent is added, wherein the amount of ammonium sulfite is 16% of the absolute dry raw material, and the liquid ratio is 1:3. The first heating is heated up to 140°C, and the temperature is kept at this temperature for 120 minutes, and then the steam is released for 20-30 minutes. After cooking, a pulp with a hardness of 12 is obtained. Adjust the concentration of the pulp to 12% and then squeeze it through a variable-diameter single-screw squeezer. After squeezing, a pulp with a concentration of 20% is obtained, and then washed with a three-stage vacuum pulp washer. . The pulp after washing is sent to the kneading machine for de-lignification, and then oxygen delignification. Before entering the oxygen delignification reaction tower, the pulp is mixed with the oxygen of 30kg per ton of pulp added in the pip...

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Abstract

The invention discloses a method for preparing bleached chemical pulp by taking a grass plant as a raw material, which comprises the following steps: (1) the prepared grass raw material is stewed to obtain pulp of which the hardness has a potassium permanganate value of between 12 and 25; (2) the pulp after the stewing is squeezed and scrubbed, and then is subjected to disintegration treatment; and (3) pulp obtained through the disintegration treatment is subjected to oxygen delignification treatment and bleaching treatment to obtain the bleached chemical pulp. The bleached chemical pulp can be taken as pulp for preparing and producing high-quality culture paper, and has rich raw materials and low cost. In the preparation method, the whiteness needed by the pulp can be achieved without hypochlorite bleaching through the combination of the stewing, pulp squeezing, pulp washing, oxygen delignification, chlorination and alkali treatment, thereby avoiding a series of environmental problems caused by the hypochlorite bleaching.

Description

[0001] This application is a divisional case of an application with the application number 200710300209.X, the application date is December 5, 2007, and the invention name is "a pulp and black liquor prepared from grass raw materials, its preparation method and its application" Application. technical field [0002] The invention relates to a method for preparing bleached chemical pulp, more specifically, the invention relates to a method for preparing bleached chemical pulp by using grass plants as raw materials. Background technique [0003] 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. [0004] The main components of paper are cellulose and hemicellulose. There are two kinds of plant fibers used as papermaking raw materials: wood fiber and non-wood fiber. Their main compone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/00D21C9/00D21H11/12D21C7/00D21B1/06D21C3/14D21C3/02D21H17/05D21H17/66D21D1/00D21C9/18D21C9/02D21C9/10D21C9/12
Inventor 宋明信陈松涛李洪法毕衍金杨吉慧
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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