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Production method of bamboo chemical dissolving pulp

A technology of chemical dissolution and bamboo, which is applied in pulp bleaching, pulping with inorganic alkali, multi-stage pulping process, etc., can solve the problems of high biological toxicity of water body and large waste water pollution load, etc.

Active Publication Date: 2009-06-17
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Bleaching: C-E-H bleaching is adopted. The wastewater pollution load produced by this bleaching process is large, and dioxin is produced. This substance is an internationally recognized carcinogen and is highly toxic to water bodies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0204] Requirements for the primary cooking process:

[0205] 1) Liquid ratio: 1.0

[0206] 2) Dosage of sulfite (sodium, calcium, magnesium, ammonium): 0.5% (for absolute dry raw materials)

[0207] 3) Cooking pressure: 0.5mpa

[0208] 4) Cooking temperature: 150°C

[0209] 5) The residence time of bamboo slices in the cooking tube: 30min

[0210] 6) Cooling liquid temperature before spraying: 50°C

[0211] 7) Spray slurry concentration: 4%

[0212] 8) Slurry concentration in spray pot: 3%

[0213] 9) Concentration of inclined propeller: 3%

[0214] 10) Concentration of oblique propeller: 10%

[0215] 11) Concentration into the screw press: 10%

[0216] 12) Out of the screw press machine concentration: 25%

[0217] The quality index of cooking slurry is:

[0218] Kappa value (kappa): 120

[0219] Semi-slurry retention rate: 80%

[0220] Spray pan slurry: PH=7

[0221] Spray pan slurry temperature: 90°C

Embodiment 2

[0223] Requirements for the primary cooking process:

[0224] 1) Liquid ratio: 1.8

[0225] 2) Sulfite (sodium, calcium, magnesium, ammonium) dosage %: 1.5% (for absolute dry raw materials)

[0226] 3) Cooking pressure: 0.7mpa

[0227] 4) Cooking temperature: 160°C

[0228] 5) The residence time of bamboo slices in the cooking tube: 50min

[0229] 6) Cooling liquid temperature before spraying: 50°C

[0230] 7) Spray slurry concentration: 4%

[0231] 8) Slurry concentration in spray pot: 3%

[0232] 9) Concentration of inclined propeller: 3.5%

[0233] 10) Concentration of oblique propeller: 11%

[0234] 11) Concentration into the screw press: 11%

[0235] 12) Out of the screw press machine concentration: 26%

[0236] The quality index of cooking slurry is:

[0237] 1) Kappa value (kappa): 135

[0238] 2) Semi-slurry retention rate: 84%

[0239] 3) Spray pot slurry: PH=7.2

[0240] 4) Slurry temperature of spray pot: 89°C

Embodiment 3

[0242] Requirements for the primary cooking process:

[0243] 1) Liquid ratio: 2.6

[0244] 2) Sulfite (sodium, calcium, magnesium, ammonium) dosage %: 3% (for absolute dry raw materials)

[0245]3) Cooking pressure: 0.85mpa

[0246] 4) Cooking temperature: 170°C

[0247] 5) The residence time of bamboo slices in the cooking tube: 80min

[0248] 6) Cooling liquid temperature before spraying: 48°C

[0249] 7) Spray slurry concentration: 5%

[0250] 8) Slurry concentration in spray pot: 4%

[0251] 9) Concentration of inclined propeller: 3.7%

[0252] 10) Concentration of oblique propeller: 12%

[0253] 11) Concentration into the screw press: 12%

[0254] 12) Out of the screw press machine concentration: 27%

[0255] The quality index of cooking slurry is:

[0256] 1) Kappa value (kappa): 155

[0257] 2) Semi-slurry retention rate: 87%

[0258] 3) Spray pot slurry: PH=7.2

[0259] 4) Slurry temperature of spray pot: 88°C

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Abstract

Aiming at the current situation of the cotton dissolving pulp and the wood dissolving pulp and the characteristics of the bamboo and the defects in the existing preparation of the dissolving pulp, the invention provides a method for preparing a chemical bamboo dissolving pulp. The chemical dissolving pulp produced can be widely applied in the cellulose derivative industries such as spinning viscose fiber, nitrocellulose and acetate fiber. The method comprises the following steps of: material preparation, cooking, screening, scrubbing, bleaching and paper making. The cooking procedure comprises two grades of cooking steps, wherein the primary cooking procedure is continuous cooking and the secondary cooking procedure is continuous cooking or intermittent cooking; and the bleaching procedure is elemental chlorine free bleaching or totally chlorine free bleaching. The invention solves the problems existed in the cooking and bleaching procedures. The chemical bamboo dissolving pulp can be prepared with high efficiency, 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. In the present invention, the bamboo dissolving pulp preparation method proposed especially for the needs of weaving 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 production of cotton linters has also decreased year by year, and forest resources such as needles and broad-leaved trees ...

Claims

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Application Information

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IPC IPC(8): D21C3/26D21C7/00D21C3/02D21D5/02D21C9/02D21C9/14D21C9/16D21F11/00
Inventor 薛勤于渭东徐发祥刘爱兵
Owner YIBIN GRACE GROUP CO LTD
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