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Method for preparing modified lignosulfonate water reducing agent with acrylic waste water as raw material

A technology of lignosulfonate and acrylic acid, applied in the field of building materials, can solve the problems of low energy consumption, low treatment rate, and secondary pollution of biological methods

Inactive Publication Date: 2014-02-19
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fuel oil must be added to the incineration process, and the treatment cost is as high as 200-300 yuan / ton, and the secondary pollution cannot be completely avoided; the catalytic wet oxidation method has high treatment efficiency and fast speed, but its specificity limits this technology Popularization and application in the treatment of acrylic acid and ester wastewater with complex components; the biological method has low energy consumption, and is economical and environmentally friendly. cause secondary pollution
[0004] At present, the treatment of acrylic acid wastewater mainly relies on imported technology, the treatment rate is low, and the mismatch of environmental technology has become a constraint for the industry

Method used

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  • Method for preparing modified lignosulfonate water reducing agent with acrylic waste water as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The content of acrylic acid, sodium hypophosphite (reducing agent), and methanesulfonic acid (catalyst) in the acrylic acid waste liquid were determined to be 4.2%, 2.5%, and 2.4% respectively. Sodium lignosulfonate was used, and the reducing agent content in the index was 7.2%. .

[0027] Put 100 parts of lignosulfonate and 250 parts of deionized water in a synthetic reaction vessel, mix well, heat to 80°C, and stabilize at 80±2°C, add 10 parts of permanganic acid after stabilization; add 6 parts of persulfuric acid Ammonium and 206 parts of deionized water were mixed evenly and placed in the dripping container B. After the temperature of the permanganic acid solution added to the synthesis reaction container was stabilized for 5 minutes, the liquid in the container B was started to be added dropwise, and the dripping was completed in 4.5 hours; 320 parts of acrylic acid waste liquid (with 10 parts of permanganic acid added) and 11 parts of sodium methacrylate were mix...

Embodiment 2

[0029] The content of acrylic acid, sodium nitrite (reducing agent) and p-toluenesulfonic acid (catalyst) in the butyl acrylate waste liquid was determined to be 5.8%, 1.8%, and 2.8% respectively. Calcium lignosulfonate was used, and the content of reducing agent in the index 9.0%.

[0030] Put 100 parts of calcium lignosulfonate and 250 parts of deionized water in a synthetic reaction vessel, mix well, heat to 60°C, and stabilize at 60±2°C, add 10 parts of permanganic acid after stabilization; add 6 parts of persulfuric acid Ammonium and 206 parts of deionized water were mixed evenly and placed in the dripping container B. After the temperature of the permanganic acid solution added to the synthesis reaction container was stabilized for 5 minutes, the liquid in the container B was started to be added dropwise, and the dripping was completed in 4.5 hours; 320 parts of acrylic acid waste liquid (with 11 parts of permanganic acid added) and 12.5 parts of sodium methacrylate were...

Embodiment 3

[0032] The content of acrylic acid, sodium nitrite (reducing agent) and p-toluenesulfonic acid (catalyst) in the butyl acrylate waste liquid was determined to be 5.8%, 1.8%, and 2.8% respectively. Calcium lignosulfonate was used, and the content of reducing agent in the index 9.0%.

[0033] Put 100 parts of lignosulfonate and 250 parts of deionized water in a synthetic reaction vessel, mix well, heat to 80°C, and stabilize at 80±2°C, add 10 parts of permanganic acid after stabilization; add 6 parts of persulfuric acid Ammonium and 206 parts of deionized water were mixed evenly and placed in the dripping container B. After the temperature of the permanganic acid solution added to the synthesis reaction container was stabilized for 5 minutes, the liquid in the container B was started to be added dropwise, and the dripping was completed in 4.5 hours; 112 parts of acrylic acid waste liquid (with 10 parts of permanganic acid added) and 15 parts of sodium methacrylate were mixed eve...

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Abstract

The invention discloses a method for preparing a modified lignosulfonate water reducing agent with acrylic waste water as a raw material. The method comprises the steps as follows: determining the specific content of acrylic acid, a catalyst and a reducing agent in the acrylic waste water, adding an oxidizing agent into the acrylic waste water for pretreatment, and determining a synthesis ratio according to test results; and placing the lignosulfonate and deionized water in a certain proportion in a flask, stirring and heating the mixture to the temperature of 60-80 DEG C, and after stabilization, having a graft polymerization reaction with the acrylic waste water and small sodium sulfonate monomers under the action of a catalyst and an initiator to obtain the modified lignosulfonate water reducing agent. According to the method, the acrylic acid and ester waste water are used as modified monomers, so that the cost of the modified lignosulfonate water reducing agent is reduced.

Description

technical field [0001] The invention relates to a method for preparing a modified lignosulfonate water reducer by using acrylic acid wastewater as a raw material, and belongs to the technical field of building materials. Background technique [0002] The rapid development of the acrylic acid industry has promoted the development of the social economy, but at the same time it has brought pressure on the ecological environment, manifested in the high concentration of organic wastewater discharged during the production process. Acrylic acid wastewater is the eluent after the esterification of acrylic acid and alcohol. In addition to acrylic acid, there are generally residual catalysts and reducing agents. For example, the eluent after the polymerization and esterification of acrylic acid and polyols, in addition to removing excess acrylic acid, there are residual catalyst methanesulfonic acid and a small amount of reducing agent hypophosphorous acid; The process wastewater of ...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F220/06C08F228/02C04B24/18C04B103/30
Inventor 柯凯徐保明唐强陈坤
Owner HUBEI UNIV OF TECH
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