High-purity sulfate pulp, as well as production method and application thereof

A technology of kraft pulp and kraft method, applied in pulp bleaching, pulping with inorganic alkali, chemical/chemical mechanical pulp, etc., can solve the problems of unsuitable viscose fiber production and use, save resources and discharge pollutants Low volume and low energy consumption

Active Publication Date: 2012-08-01
湖南骏泰新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bleached kraft pulp usually contains more than 13% hemicellulose, which is not suitable for viscose fiber production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Masson pine wood fiber raw material is pulped in a vertical continuous cooking device, and the wood fiber raw material is first steamed at a temperature of 99° C. for 0.8 hour; then soaked in black liquor at 160° C. for 1.0 hour, after the dipping treatment, from The pH value of the filtrate extracted from above is lower than 7; after that, it is cooked at a temperature of 168°C for 4.5 hours. The alkali used in the cooking process is the white liquor obtained in the alkali recovery process. The clarity of the white liquor is 30ppm. The amount of alkali used in the cooking process is over NaOH is calculated as 26% of the weight of dry wood chips, and the degree of sulfidation of the lye is 30%; the slurry is washed with black liquor in the washing area of ​​the digester for 0.8 hours and then sprayed. The spraying temperature is 96 ° C, and the slurry spraying concentration 9wt%, the kappa value of the pulp after spraying is 20, and the intrinsic viscosity ...

Embodiment 2

[0016] Example 2: The eucalyptus wood fiber raw material is pulped in a vertical continuous cooking device. The wood fiber raw material is first steamed at a temperature of 96° C. for 1.2 hours; then soaked in black liquor at 145° C. for 1.5 hours. The pH value of the filtrate extracted from above is lower than 7; after that, it is cooked at a temperature of 172°C for 3.5 hours. The alkali used in the cooking process is the white liquor obtained in the alkali recovery process. The clarity of the white liquor is 28ppm. The amount of alkali used in the cooking process is NaOH is calculated as 23% of the weight of dry wood chips, and the degree of sulfidation of lye is 26%; the slurry is washed with black liquor in the washing area of ​​the digester for 1.2 hours and then sprayed. 12wt%, the kappa value of the pulp after spraying is 15, and the intrinsic viscosity is 700dl / g; the slurry after spraying is washed and screened and sent to oxygen delignification treatment, and the con...

Embodiment 3

[0017] Example 3: Mixed wood fiber raw materials such as masson pine, eucalyptus, southern pine, etc. are pulped in a vertical continuous cooking device, and the wood fiber raw materials are first steamed at a temperature of 98 ° C for 1 hour; then in black liquor at 155 ° C After soaking for 1.2 hours, the pH value of the filtrate extracted from above after soaking treatment is lower than 7; after that, it is cooked at a temperature of 170°C for 4 hours, and the alkali used in the cooking process is the white liquor obtained in the alkali recovery process. The clarity of the white liquor is 25ppm, the amount of alkali used in the cooking process is 25% of the dry wood chip weight in terms of NaOH, and the degree of sulfidation of the lye is 28%; the slurry is sprayed after being washed with black liquor for 1 hour in the washing area of ​​the digester, and the spraying temperature is 94°C, the concentration of slurry spraying is 10.5wt%, the kappa value of the pulp after spray...

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Abstract

The invention relates to high-purity sulfate pulp, as well as a production method and an application thereof. The high-purity sulfate pulp is prepared by stewing wood fiber raw material through a sulfate process for pulping, performing oxygen delignification and bleaching with DOEOPD1P, wherein the content of alpha cellulose in the pulp is not lower than 88% by weight; the content of pentosan is 4.5-6.5% by weight; the alkali solubility S18 of the pulp is 6.0-8.5% by weight; a DCM (dichloromethane) extract of the pulp is 0.1-0.30% by weight; the ash content is not higher than 0.15% by weight; the iron content is not higher than 20mg/kg; the SiO2 content is not higher than 50mg/kg; the inherent viscosity is 450-550dl/g; and the whiteness is not lower than 87% ISO, and the pulp is used for being mixed into dissolving pulp for producing viscose fiber.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a high-purity kraft pulp used with dissolving grade pulp to manufacture regenerated cellulose fibers and cellulose chemical derivatives; the invention also relates to a high-purity kraft pulp Production methods and applications of pulp. Background technique [0002] Dissolving pulp refers to high-purity pulp with high α-cellulose content and uniform polymerization degree distribution. Its main purpose is to produce viscose fiber and special fiber. Bleached kraft pulp usually contains more than 13% hemicellulose, which is not suitable for viscose fiber production. High-purity kraft pulp refers to the improvement on the basis of the production method of bleached kraft pulp, which reduces the hemicellulose content of bleached kraft pulp, improves the purity and reactivity of pulp, and enables high-purity kraft pulp to be produced by a certain amount. Proportionally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/04D21C3/02D21C9/16D21C9/10
Inventor 徐远梅周鲲鹏万政黄百文徐应盛樊春华周万勇汪芳潘敏
Owner 湖南骏泰新材料科技有限责任公司
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