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Preparation method of low-contamination lignosulfonate

A technology of lignosulfonate and staining, which is applied in the field of preparation of lignosulfonate and low-contamination lignosulfonate, and can solve the problems of unrealized resource utilization, underutilization, and pollution To achieve the effect of realizing waste utilization, good dispersion and reducing environmental pollution

Inactive Publication Date: 2019-04-26
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Soda pulping is one of the mainstream pulping methods. The waste liquid produced during the cooking process contains a large amount of lignin. However, only a small part of the waste liquid is used in the pulp and paper industry at present, and most of the waste liquid is used in the soda pulping process. The waste liquid has not been used yet, and is currently used for burning energy recovery and cooking lye
This method does not realize the full utilization of resources, and at the same time, the combustion also has a certain degree of pollution. Therefore, it is urgent to develop a utilization method of caustic soda pulping waste liquid to realize efficient utilization of caustic soda pulping waste liquid and realize resource conservation. high value utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing low-contamination lignin sulfonate from caustic soda pulping waste liquor, comprising the following steps:

[0029] First, the waste liquid is left to stand for 1 hour, and the water-insoluble matter and cellulose impurities in the pulping waste liquid by the caustic soda method are removed by using a disc filter.

[0030] The ultrafiltration membrane filtration equipment is used to concentrate the caustic soda pulping waste liquid, and the concentration of the caustic soda pulping waste liquid is increased from 8wt% to 15wt%.

[0031] Use 10wt% sodium sulfite and 10wt% paraformaldehyde at 90°C and pH=9.2 for 4 hours in the concentrated solution, and carry out sulfonation and condensation reactions on the concentrated solution to produce lignin sulfonate with high dispersibility and heat resistance salt.

[0032] The sulfonated concentrated solution was reacted with 4 wt % hydrogen peroxide at 50° C. for 2 hours to reduce the staining property of...

Embodiment 2

[0036] A method for preparing low-contamination lignin sulfonate from caustic soda pulping waste liquor, comprising the following steps:

[0037] First, the waste liquid is left to stand for 1 hour, and the water-insoluble matter and cellulose impurities in the pulping waste liquid by the caustic soda method are removed by using a disc filter.

[0038] The nanofiltration membrane filtration equipment is used to concentrate the caustic soda pulping waste liquid, and the concentration of the caustic soda pulping waste liquid is increased from 10wt% to 20wt%.

[0039] Use 13wt% sulfur dioxide and 15% formaldehyde in the concentrate to react at 95°C and pH=12.8 for 3 hours, and carry out sulfonation and condensation reactions on the concentrate to produce lignosulfonate with high dispersibility and heat resistance .

[0040] The sulfonated concentrated solution was reacted with 5 wt% hydrogen peroxide at 60° C. for 1 hour to reduce the staining property of lignosulfonate.

[004...

Embodiment 3

[0044] A method for preparing low-contamination lignin sulfonate from caustic soda pulping waste liquor, comprising the following steps:

[0045] First, the waste liquid is left to stand for 1 hour, and the water-insoluble matter and cellulose impurities in the pulping waste liquid by the caustic soda method are removed by using a disc filter.

[0046] The nanofiltration membrane filtration equipment is used to concentrate the caustic soda pulping waste liquid, and the concentration of the caustic soda pulping waste liquid is increased from 15wt% to 30wt%.

[0047] Use 30wt% sodium bisulfite and 35wt% formaldehyde in the concentrated solution to react for 5 hours at 80°C and pH=8.0, and carry out sulfonation and condensation reactions on the concentrated solution to produce high dispersion, heat resistance, and low Staining lignosulfonates.

[0048]Sodium chlorite with an amount of 8 wt% of the concentrated solution was used to react at 80° C. for 4 hours to react the sulfona...

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Abstract

The invention discloses a preparation method of low-contamination lignosulfonate. The method comprises the steps as follows: after precipitating slurrying waste liquor for 0.5-2 h, removing water insoluble matter and cellulose impurities by a filter; condensing the slurrying waste liquor by membrane filter equipment to increase the concentration of the slurrying waste liquor from 8wt%-15wt% to 15wt%-30wt%; putting a sulfonating agent accounting for 5wt%-40wt% of concentrated liquor and a condensing agent accounting for 5wt%-40wt% of concentrated liquor once, conducting a reaction at 70-100 DEGC for 1-6 h, and performing sulfonation and polycondensation on the concentrated liquor; adding 0-10wt% of a reaction reagent to the concentrated liquor after sulfonation and polycondensation reaction, and conducting a reaction at 40-80 DEG C for 1-5 h; performing spray drying by a hot blast stove reaction solution to obtain lignosulfonate powder with finer particles. The invention also relates to lignosulfonate prepared with the preparation method. The low-contamination lignosulfonate is prepared from the slurrying waste liquor, particularly soda process slurrying waste liquor, waste utilization is realized, and the lignosulfonate has high thermal stability, good dispersity and low contamination while environmental pollution is reduced.

Description

technical field [0001] The invention relates to the field of lignosulfonate preparation, in particular to a method for preparing lignosulfonate with low staining property and the prepared lignosulfonate. Background technique [0002] The pulp and paper industry is one of the most heavily polluting industries in my country. The main source of pollution is pulping waste liquid, and lignin is the main component of the waste liquid, accounting for about one-third of the solid content of the waste liquid. . Because lignin is greatly damaged by cooking chemicals during the pulping process, and different raw materials also increase the difficulty of lignin utilization to a certain extent, the current utilization of pulping waste liquid is very low, and it is only used as fuel combustion recovery Alkali in energy and waste liquid. [0003] Lignin is a kind of substance formed by the polymerization of aromatic alcohols. It exists in woody tissues. Its main function is to harden the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 施晓旦赵吉郑璐金霞朝
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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