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A kind of preparation method of mixing aid for papermaking

A technology of additives and film-forming agents, which is applied in the field of pulp and paper making, can solve problems such as unsatisfactory pollution control effects, difficulty in recycling and reuse, and no economic benefits, so as to achieve wide product uses, improve resource utilization, Effective use of resources

Inactive Publication Date: 2016-06-08
珠海市金浓霖化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of technology has a large investment, covers a large area, and has high operating costs. It has no economic benefits, and the effect of pollution control is not ideal.
[0009] (3) The flocculation method is used to treat papermaking black liquor. Although this method has a good treatment effect, the cost is too high for enterprises to afford, and it is difficult to recycle and reuse after flocculation, so it is difficult to put into practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: the preparation method of the mixing aid for papermaking The specific operations are as follows:

[0031] (1) The collected pulping black liquor (obtained by using the caustic soda method on the Dalong bamboo raw material with an alkali consumption of 20%, a liquid ratio of 1:4, a temperature of 135°C, a heating time of 2 hours, and discharging after 2 hours of heat preservation) Be concentrated to the mass percent concentration of solid in the liquid to be 20%;

[0032] (2) Naturally age the black liquor concentrated in step (1) for 26 hours;

[0033] (3) The aged black liquor obtained in step (2) is adjusted to pH 7.5 with sulfuric acid, and acidified to obtain acidified black liquor;

[0034] (4) Add esterification agent acetic anhydride to the acidified black liquor, carry out esterification at 45°C, stirring speed 50r / min, reaction time 1h, wherein the amount of esterification agent added is 5% of the mass of the acidified black liquor;

[0035](5) ...

Embodiment 2

[0040] Embodiment 2: the preparation method of the mixing aid for papermaking The specific operation is as follows:

[0041] (1) Concentrate the collected pulping black liquor (obtained by the caustic soda method on the bagasse raw material with an alkali amount of 12%, a liquid ratio of 1:4, a temperature of 125°C, a temperature rise of 1.5 hours, and a heat preservation of 1.5 hours through a squeezer) To the mass percent concentration of solids in the liquid is 30%;

[0042] (2) Naturally age the black liquor concentrated in step (1) for 10 hours;

[0043] (3) The aged black liquor obtained in step (2) is adjusted to pH 8.0 with hydrochloric acid, and acidified to obtain acidified black liquor;

[0044] (4) Add maleic anhydride, an esterifying agent, to the acidified black liquor, carry out esterification at 80°C, stir (stirring speed 80r / min) for a reaction time of 2 hours, in which the amount of esterifying agent added is 2% of the mass of the acidified black liquor,

...

Embodiment 3

[0051] Embodiment 3, the specific operation of the preparation method of the mixing aid for papermaking is as follows:

[0052] (1) The collected pulping black liquor (using caustic soda-anthraquinone method for eucalyptus raw materials with alkali consumption (NaOH) 16%, anthraquinone 0.2%, liquid ratio 1:3.5, temperature 138°C, heating time 2.5 Hours, obtained after being squeezed by a screw press after 2 hours of heat preservation) concentrated to a mass percentage concentration of solids in the liquid is 15%;

[0053] (2) Naturally age the black liquor concentrated in step (1) for 90 hours;

[0054] (3) The aged black liquor obtained in step (2) is adjusted to pH 8.0 with acetic acid, and then acidified to obtain acidified black liquor;

[0055] (4) Add a film-forming agent to the acidified black liquor, and then treat it at 20°C with stirring (100r / min) for 1 hour to obtain a mixing aid for papermaking, where the film-forming agent is added in an amount of 3% of the mass...

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PUM

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Abstract

The invention discloses a preparation method of a mixed additive for papermaking, belonging to the field of pulping and papermaking. The preparation method is characterized in that black liquor which is the raw material for papermaking is acidified or / and modified based on the characteristics of black liquor and then is coated to the paper surface to be completely utilized without any discharge, so as to reach the purpose of avoiding pollutant discharge and realizing comprehensive cyclic utilization of black liquor for pulping. The method for preparing and comprehensively utilizing black liquor for pulping is provided for the papermaking industry, and also an effective path is created for industrial, clean and pollution-free pulping and papermaking. With the adoption of the preparation method, the yield of finished paper product under pulping and papermaking is raised by 60 to 80% on the original basis, and thus the resource utilization rate is effectively raised.

Description

technical field [0001] The invention relates to the field of pulp and papermaking, in particular to a preparation method of a mixing aid for papermaking. Background technique [0002] The fiber raw materials used in pulp and papermaking worldwide are mainly wood, accounting for about 90%. my country's forest resources are poor, and the per capita wood is less. The fiber raw materials used in the paper industry are mainly grass raw materials, which are pulped by chemical methods, resulting in a large amount of waste liquid. my country's paper industry discharges 4 billion tons of wastewater annually, accounting for 1 / 6 of the national industrial wastewater discharge. About 90% of the waste water discharged from the paper industry is black liquor, which accounts for most of the pollutants discharged by the paper industry. The main components of black liquor are hemicellulose, pectin, resin, pigment, silicide, lignin, etc., and also contain unconsumed sodium hydroxide and sod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/04
Inventor 高正卿王忠良周力平和智明陈勇
Owner 珠海市金浓霖化工科技有限公司
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