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Chlorine dioxide bleaching method of pre-extracted bamboo pulp

A chlorine dioxide and hot water pre-extraction technology is used in pulp bleaching, cellulose raw material pulping, textile and papermaking, etc., which can solve the problems of low pulp yield and achieve the effect of improving yield

Inactive Publication Date: 2015-01-21
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the traditional hot water pre-extraction process also has a negative impact on the subsequent caustic soda anthraquinone pulping and chlorine dioxide bleaching, because while a large amount of hemicellulose is extracted, there is also a small amount of cellulose and lignin Degradation, so the final slurry yield will be relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Chlorine dioxide bleaching method of bamboo pulp after pre-extraction:

[0019] 1. Hot water pre-extraction of bamboo slices:

[0020] Bamboo chips mass g after drying: volume mL of distilled water is 1:5, bamboo chips and distilled water after drying are all put into the cooking tank, add sodium hydroxide to adjust the pH value of the solution to 3, then adopt electric heating mode, the temperature is by The room temperature is raised to 170° C., and then the solid-liquid separation is carried out after the heat preservation for 60 minutes, and the solid is dried to obtain dried bamboo chips after hot water pre-extraction.

[0021] 2. Cooking with caustic soda anthraquinone method:

[0022] Get the bamboo chip 100g after step 1 dryness, carry out cooking operation in cooking tank, wherein: bamboo chip quality g after drying: distilled water volume mL is 1: 4, add in cooking tank: cooking sodium hydroxide consumption is absolute dryness 27% of the mass of the bamboo c...

Embodiment 2

[0026] Chlorine dioxide bleaching method of bamboo pulp after pre-extraction:

[0027] 1. Hot water pre-extraction of bamboo slices:

[0028] The mass of bamboo chips after drying in g: the volume of distilled water in mL is 1:5; the bamboo chips and distilled water after drying are all put into the cooking pot, and sodium hydroxide is added to adjust the pH value of the solution to 4, and then the temperature is raised by electric heating. The room temperature is raised to 170° C., and then the solid-liquid separation is carried out after the heat preservation for 60 minutes, and the solid is dried to obtain dried bamboo chips after hot water pre-extraction.

[0029] 2. Same as Example 1.

[0030] 3. Same as Example 1.

[0031] Traditional hot water pre-extraction of bamboo chips, that is, the pre-extraction of bamboo chips with uncontrolled solution pH, the yield of unbleached pulp is 43%; the yield of unbleached pulp after hot water pre-extraction of bamboo chips The rat...

Embodiment 3

[0033] Chlorine dioxide bleaching method of bamboo pulp after pre-extraction:

[0034] 1. Hot water pre-extraction of bamboo slices:

[0035] The weight of bamboo chips after drying g: volume mL of distilled water is 1:5; the bamboo chips and distilled water after drying are all put into the cooking pot, and sodium hydroxide is added to adjust the pH of the solution to be 5, and then the temperature is raised by electric heating. The room temperature is raised to 170° C., and then the solid-liquid separation is carried out after the heat preservation for 60 minutes, and the solid is dried to obtain dried bamboo chips after hot water pre-extraction.

[0036] 2. Same as Example 1.

[0037] 3. Same as Example 1.

[0038] Traditional hot water pre-extraction of bamboo chips, that is, the pre-extraction of bamboo chips with uncontrolled solution pH, the yield of unbleached pulp is 43%; the yield of unbleached pulp after hot water pre-extraction of bamboo chips The rate was 47%, ...

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PUM

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Abstract

The invention discloses a chlorine dioxide bleaching method of pre-extracted bamboo pulp and belongs to the field of cleaned pulping and papermaking. The chlorine dioxide bleaching method comprises the following steps: putting bamboo chips into a cooking pot, adding a certain amount of distilled water, adding alkaline to adjust the pH of the solution to be 3-5, heating hot water to 170 DEG C, carrying out heat preservation at highest temperature for 60 minutes, cooking the bamboo chips hydrolyzed at high temperature by adopting a soda anthraquinone method, and finally, carrying out chlorine dioxide bleaching operation on primary pulp. Compared with the prior art, the chlorine dioxide bleaching method has the advantages that the pulp yield is obviously increased; with the identical consumption of chlorine dioxide, the ISO whiteness of the pulp is higher.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to a chlorine dioxide bleaching method for bamboo pulp after pre-extraction. Background technique [0002] In recent years, with the development of biomass refining technology, making full use of hemicellulose in woody biomass has become a hot spot in current biomass refining. The new mode of hemicellulose biorefining is to extract part of hemicellulose through pre-extraction before traditional cooking, and after separation, it can be hydrolyzed and fermented to produce ethanol or directly extract acetic acid and other chemicals; after extraction High-quality plant fiber raw materials can still be used for pulp and papermaking, and can reduce the loss of cooking chemicals, and the pulp is easier to bleach. [0003] However, the traditional hot water pre-extraction process also has a negative impact on the subsequent caustic soda anthraquinone pulping and chlorine dioxide blea...

Claims

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Application Information

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IPC IPC(8): D21C9/14
CPCD21C9/144D21C3/022D21C3/222D21C9/163
Inventor 姚双全覃程荣聂双喜王双飞高聪袁月詹磊
Owner GUANGXI UNIV