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Low-solid sulfate method continuous cooking process

A kraft method and solids technology, applied in continuous pulping process, multi-stage pulping process, using microorganism/enzymatic cellulose treatment, etc., can solve the problems of reducing chemical consumption, increasing, and consuming white liquor, and achieve reduction Effects of evaporator load, demand reduction, and COD reduction

Pending Publication Date: 2021-04-30
山东晨鸣纸业集团股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Whether it is batch cooking or continuous cooking, while obtaining low-hardness pulp, it maintains good pulp strength and yield, but there are still many problems. These solids are mainly dissolved lignin, carbohydrates, etc. The existence of solids will consume a large amount of white liquor, and will also lead to a decrease in the viscosity, brightness, and strength of the subsequent bleached pulp and an increase in the amount of subsequent chemicals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 A kind of low-solid sulfate method continuous cooking process

[0031] The continuous cooking process comprises the following steps:

[0032] 1) Prepare wood:

[0033] Match the wood chips in proportion, the chip diameter is 25mm, and the thickness is 4mm;

[0034] The wood chips include: 45% eucalyptus, 40% acacia, 10% pine, 5% miscellaneous wood;

[0035] 2) Steaming:

[0036] Heat the wood chips in the wood chip bin, take in air from the bottom, and discharge air, steam, turpentine and other organic substances from the top. The exhaust temperature at the top of the wood chip bin is 60°C; the steaming temperature of the wood chips is 100°C; the steaming time is 15 minutes, and the black liquor is extracted;

[0037] 3) Enzyme treatment:

[0038] Add complex enzymes to the steamed wood chips for enzyme treatment, the treatment temperature is 50°C, the treatment time is 45min, the concentration of the treatment solution is 10%, and the reaction solution...

Embodiment 2

[0059] Embodiment 2 A kind of low-solid sulfate method continuous cooking process

[0060] The continuous cooking process comprises the following steps:

[0061] 1) Prepare wood:

[0062] Match the wood chips in proportion, the chip diameter is 30mm, and the thickness is 4mm;

[0063] The wood chips include: 50% eucalyptus, 35% acacia, 10% pine, 5% miscellaneous wood;

[0064] 2) Steaming:

[0065]Heat the wood chips in the wood chip bin, take in air from the bottom, and discharge air, steam, turpentine and other organic substances from the top. The exhaust temperature at the top of the wood chip bin is 60°C; the steaming temperature of the wood chips is 110°C; the steaming time is 15 minutes, and the black liquor is extracted;

[0066] 3) Enzyme treatment:

[0067] Add complex enzymes to the steamed wood chips for enzyme treatment, the treatment temperature is 60°C, the treatment time is 120min, the concentration of the treatment solution is 15%, and the reaction solution...

Embodiment 3

[0088] Embodiment 3 A kind of low-solid sulfate method continuous cooking process

[0089] The continuous cooking process comprises the following steps:

[0090] 1) Prepare wood:

[0091] Match the wood chips in proportion, the chip diameter is 30mm, and the thickness is 5mm;

[0092] The wood chips include: 50% eucalyptus, 40% acacia, 8% pine, 2% miscellaneous wood;

[0093] 2) Steaming:

[0094] Heat the wood chips in the wood chip bin, take in air from the bottom, and discharge air, steam, turpentine and other organic substances from the top. The exhaust temperature at the top of the wood chip bin is 65°C; the steaming temperature of the wood chips is 110°C; the steaming time is 20 minutes, and the black liquor is extracted;

[0095] 3) Enzyme treatment:

[0096] Add complex enzymes to the steamed wood chips for enzyme treatment, the treatment temperature is 60°C, the treatment time is 120min, the concentration of the treatment solution is 20%, and the reaction solution...

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Abstract

The invention provides a low-solid sulfate method continuous cooking process, which comprises the steps of steaming, enzyme treatment, pretreatment and continuous cooking, and utilizes steaming and biological enzyme treatment to destroy the structure of wood chips, so that the wood chips are softened, and subsequent liquid medicine can enter the process more favorably. In the continuous cooking process, cooking conditions are reasonably controlled, black liquor is extracted from a cooking system for multiple times, dissolved solids are discharged out of the system, then fresh cooking liquor is supplemented, the content of the solids in the cooking liquor is greatly reduced, high-quality paper pulp can be obtained, by means of the continuous cooking process, the cooking yield is 50-65%, and the kappa number of the paper pulp reaches 14-18.

Description

technical field [0001] The invention belongs to the technical field of pulp cooking, and in particular relates to a low-solid kraft continuous cooking process. Background technique [0002] With the increasingly stringent environmental protection requirements, all-wood pulp has gradually become the main raw material of my country's pulp and paper industry. Wood raw materials include coniferous wood and hardwood. At present, there are two main methods for producing chemical pulp from softwood and hardwood, one is the sulfate method, and the other is the sodium hydroxide anthraquinone method. Chemical pulp has high cellulose content, high paper strength, easy bleaching, not easy to turn yellow, and good durability. It is an indispensable pulp for making high-grade paper. [0003] Kraft pulping is the mainstream method of chemical pulping. Because of its good performance and wide application, it can be used in the production of various high-grade paper products, so it plays an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/24D21C5/00D21C3/22D21C3/26D21H11/04
CPCD21C3/022D21C3/24D21C5/005D21C3/222D21C3/26D21H11/04
Inventor 邵鲁鹏陈洪国王鲁燕许凤吉兴香杨桂花
Owner 山东晨鸣纸业集团股份有限公司
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