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Secondary decatizing method for preparing bamboo chemical dissolving pulp and application thereof

A technology of chemically dissolving bamboo, which is applied in the field of cooking for preparing bamboo chemically dissolving pulp, and the field of secondary cooking for preparing bamboo dissolving pulp, so as to achieve the effects of improving recovery, improving efficiency and improving safety

Inactive Publication Date: 2009-06-03
宜宾长毅浆粕有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the current situation of cotton and wood dissolving pulp and the characteristics of bamboo, as well as the above-mentioned many disadvantages in the cooking method of the existing dissolving pulp preparation method, and proposes a secondary cooking method for preparing bamboo chemically dissolving pulp, so as to solve the existing problems of cooking , adopting the present invention can prepare bamboo chemical dissolving pulp with high efficiency, low energy consumption, low material consumption and low pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Requirements for the primary cooking process:

[0092] 1) Liquid ratio: 1.0

[0093] 2) Dosage of sulfite (sodium, calcium, magnesium, ammonium): 0.5% (for absolute dry raw materials)

[0094] 3) Cooking pressure: 0.5mpa

[0095] 4) Cooking temperature: 150°C

[0096] 5) The residence time of bamboo slices in the cooking tube: 30min

[0097] 6) Cooling liquid temperature before spraying: 50°C

[0098] 7) Spray slurry concentration: 4%

[0099] 8) Slurry concentration in spray pot: 3%

[0100] 9) Concentration of inclined propeller: 3%

[0101] 10) Concentration of oblique propeller: 10%

[0102] 11) Concentration into the screw press: 10%

[0103] 12) Out of the screw press machine concentration: 25%

[0104] The quality index of cooking slurry is:

[0105] Kappa value (kappa): 120

[0106] Semi-slurry retention rate: 80%

[0107] Spray pan slurry: PH=7

[0108] Spray pan slurry temperature: 90°C

Embodiment 2

[0110] Requirements for the primary cooking process:

[0111] 1) Liquid ratio: 1.8

[0112] 2) Sulfite (sodium, calcium, magnesium, ammonium) dosage %: 1.5% (for absolute dry raw materials)

[0113] 3) Cooking pressure: 0.7mpa

[0114] 4) Cooking temperature: 160°C

[0115] 5) The residence time of bamboo slices in the cooking tube: 50min

[0116] 6) Cooling liquid temperature before spraying: 50°C

[0117] 7) Spray slurry concentration: 4%

[0118] 8) Slurry concentration in spray pot: 3%

[0119] 9) Concentration of inclined propeller: 3.5%

[0120] 10) Concentration of oblique propeller: 11%

[0121] 11) Concentration into the screw press: 11%

[0122] 12) Out of the screw press machine concentration: 26%

[0123] The quality index of cooking slurry is:

[0124] 1) Kappa value (kappa): 135

[0125] 2) Semi-slurry retention rate: 84%

[0126] 3) Spray pot slurry: PH=7.2

[0127] 4) Slurry temperature of spray pot: 89°C

Embodiment 3

[0129] Requirements for the primary cooking process:

[0130] 1) Liquid ratio: 2.6

[0131] 2) Sulfite (sodium, calcium, magnesium, ammonium) dosage %: 3% (for absolute dry raw materials)

[0132] 3) Cooking pressure: 0.85mpa

[0133] 4) Cooking temperature: 170°C

[0134] 5) The residence time of bamboo slices in the cooking tube: 80min

[0135] 6) Cooling liquid temperature before spraying: 48°C

[0136] 7) Spray slurry concentration: 5%

[0137] 8) Slurry concentration in spray pot: 4%

[0138] 9) Concentration of inclined propeller: 3.7%

[0139] 10) Concentration of oblique propeller: 12%

[0140] 11) Concentration into the screw press: 12%

[0141] 12) Out of the screw press machine concentration: 27%

[0142] The quality index of cooking slurry is:

[0143] 1) Kappa value (kappa): 155

[0144] 2) Semi-slurry retention rate: 87%

[0145] 3) Spray pot slurry: PH=7.2

[0146] 4) Slurry temperature of spray pot: 88°C

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Abstract

Aiming at current situations of cotton and wood dissolving pulp, characters of bamboo material and many disadvantages existing in the existing method for preparing dissolving pulp, the invention provides a secondary stewing method for preparing bamboo material chemical dissolving pulp. The produced chemical dissolving pulp can be widely applied to derivant industry of celluloses, such as spinning viscose fiber, cellulose nitrate, acetate fiber, etc. The invention uses two-stage stewing step, wherein the first stage stewing process is continuous stewing, and the second stewing process is continuous stewing or batch stewing. The invention solves problems existing in stewing processes of the method for preparing dissolving pulp so that the bamboo material chemical dissolving pulp is prepared high-efficiently with low energy consumption, low material consumption and low pollution.

Description

technical field [0001] The invention relates to a method for producing chemically dissolving pulp by using bamboo, and the produced chemically dissolving pulp can be widely used in the industries of cellulose derivatives such as textile viscose fiber, nitrocellulose and acetate fiber. Specifically, it is a cooking method for preparing bamboo chemically dissolving pulp, especially in the present invention, it is a secondary cooking method for preparing bamboo dissolving pulp that is proposed for the needs of textile viscose fibers. Background technique [0002] Chemical dissolving pulp is widely used in textile viscose fiber, nitrocellulose, acetate fiber and other cellulose derivative industries. It has a wide range of uses and a large market demand. Among the existing chemical dissolving pulps, cotton linters, coniferous woods, and hardwoods are mainly cottonwood dissolving pulps as the main raw materials. Due to the year-by-year decrease in cotton planting area, the prod...

Claims

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Application Information

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IPC IPC(8): D21C3/26D21C7/00D21C3/02
Inventor 薛勤于渭东徐发祥刘爱兵
Owner 宜宾长毅浆粕有限责任公司
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