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High-yield natural-color wood pulp production method

A production method and high-yield technology are applied in the survival field of obtaining high-yield natural wood pulp, which can solve the problems of carbohydrate degradation, consumption of chemical bleaching agents, and low whiteness, so as to reduce dosage and improve pulping yield. , the effect of reducing production costs

Inactive Publication Date: 2014-09-10
CHINA LIGHT IND INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the traditional pulping process obtains high-yield unbleached pulp, the brightness is low, and it is necessary to increase the bleaching section to improve it, thereby consuming a large amount of chemical bleaching agent, and also causing serious degradation of pulp carbohydrates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Using wood as raw material, using kraft pulping process, pulp concentration is 10%, alkali consumption is 15-18%, sulfidation degree is 26-30%, MgSO 4 The dosage is 0.5%, the cooking temperature is 140-155°C, the time is 240min, and the kappa number of unbleached pulp after cooking is 40-80. Depending on the degree of decomposition of the slurry after cooking, a deflagging machine can be added after cooking to decompose the slurry. The obtained high kappa value natural color paste is subjected to two-stage or three-stage oxygen deoxidation treatment, the amount of alkali used is 1-4%, the amount of MgSO4 is 0.5%, the amount of hydrogen peroxide is 0-5%, the initial oxygen pressure is 0.2-0.8MPa, and the temperature is 95°C , heating up for 45 minutes, and keeping warm for 90 minutes, the resulting oxygen desizing, 40-60% lignin removal, the kappa value reached is 20-35, and the pulp viscosity changes little. The slurry yield is 44-57%. Compared with the natural color ...

Embodiment 2

[0020] Using wood as raw material, adopting kraft pulping process, pulp concentration is 10%, alkali consumption is 15%, sulfidation degree is 27%, MgSO 4 The dosage is 0.5%, the cooking temperature is 145°C, the cooking time is 240min, and the kappa value of the unbleached pulp after cooking is 75. Depending on the degree of decomposition of the slurry after cooking, a deflagging machine can be added after cooking to decompose the slurry. The obtained high kappa value natural color paste is subjected to two-stage or three-stage oxygen deoxidation treatment, the amount of alkali used is 3%, the amount of MgSO4 is 0.5%, the amount of hydrogen peroxide is 1.5%, the initial oxygen pressure is 0.5MPa, the temperature is 95 ° C, the temperature is raised for 45 minutes, and the temperature is kept for 90 minutes. , the resulting oxygen desizing, 58% lignin removal, the kappa number is 31.5, and the pulp viscosity changes little. The slurry yield was 49%. Compared with the natural...

Embodiment 3

[0022] Using wood as raw material, using kraft pulping process, pulp concentration is 10%, alkali consumption is 17%, sulfidation degree is 28%, MgSO 4 The dosage is 0.5%, the cooking temperature is 153°C, the cooking time is 240min, and the kappa value of unbleached pulp after cooking is 67. Depending on the degree of decomposition of the slurry after cooking, a deflagging machine can be added after cooking to decompose the slurry. The obtained high kappa value natural color paste is subjected to two-stage or three-stage oxygen desizing treatment, the amount of alkali used is 2.5%, the amount of MgSO4 is 0.5%, the initial oxygen pressure is 0.4 MPa, the temperature is 95 ° C, the temperature is raised for 45 minutes, and the temperature is kept for 90 minutes. The lignin content is 60%, the kappa value is 26.8, and the pulp viscosity changes little. The slurry yield is 48%. Compared with the natural color pulp of traditional wood kraft pulping process, the amount of alkali ...

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Abstract

The invention discloses a high-yield natural-color wood pulp production method which comprises the following steps; boiling a wood material as a raw material by using a sulfate cooking process so as to obtain unbleached pulp, wherein the alkali amount is 15-18%, the sulfidity is 26-30%, the boiling temperature is 140-155 DEG C, and the kappa number of the unbleached pulp is 40-80; and performing oxygen delignification treatment on the unbleached pulp to remove 40-60% of lignin so as to obtain oxygen delignification pulp, wherein the alkali amount is 1-4%, the initial oxygen pressure is 0.2-0.8MPa, the temperature is less than 100 DEG C, and the kappa number of the oxygen delignification pulp is 20-35. By adopting the method, under mild reaction conditions, the use quantity of boiling chemicals is reduced, after the raw material is prepared into the pulp, the whiteness is relatively low, the Kappa number is relatively high, and the loss of carbohydrate is small, after the oxygen delignification treatment is performed, 40-60% of lignin is removed, then natural-color wood pulp which is superior to that of a conventional pulp preparing production process is obtained, the pulp yield is increased, the possibility of water closed cycle in a workshop is increased, and the production cost is greatly lowered.

Description

technical field [0001] The invention belongs to the technical field of papermaking, in particular to a production method for obtaining high-yield uncolored wood pulp. Background technique [0002] At present, my country is short of fiber resources, and a large amount of wood chips and wood pulp are imported every year. In order to make up for the shortage of fibers, in addition to advocating efficient and clean use of non-wood fiber resources, China also vigorously develops the application of chemical pulp to non-lignin paper types, so as to Saving resources and improving pulping yield have always been the focus of R&D and attention of various research institutions and enterprises. [0003] The main purpose of the natural wood pulp production process is to remove the lignin and separate it from the fiber. However, lignin removal is also accompanied by the damage of the cooking liquid to the fiber, resulting in a low cooking yield and a large processing load of the cooking wa...

Claims

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Application Information

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IPC IPC(8): D21C3/02
Inventor 靳福明夏春雨沙克菊
Owner CHINA LIGHT IND INT ENG CO LTD
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