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Method for reducing formaldehyde contained in industrial monomer dimethyl diallyl ammonium chloride

A technology of dimethyl diallyl ammonium chloride and monomer, which is applied in chemical instruments and methods, other chemical processes, water/sewage multi-stage treatment, etc., and can solve the problems that the formaldehyde removal method has not been reported in the literature, etc. To achieve the effect of easy operation, reduced content, and improved adsorption performance

Active Publication Date: 2021-01-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In summary, there is no literature report on the removal method of formaldehyde in DMDAAC monomer so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first step is to dry the woody powdered activated carbon with a particle size of less than 75 microns at a temperature of 110°C for more than 2.0 hours to fully dehydrate;

[0025] In the second step, the fully dehydrated activated carbon obtained in the first step is quickly put into a closed methylamine atmosphere and fumigated for 0.5h to modify, so as to obtain a modified woody powdery activated carbon;

[0026] In the third step, the DMDAAC monomer solution with a monomer mass fraction of 20% is fed into a reactor with a stirring device, wherein the formaldehyde content in the DMDAAC monomer solution is 50 mg / L;

[0027] The 4th step, in above-mentioned DMDAAC solution, add the modified wood powdery activated carbon that accounts for 0.1% of total mass fraction, obtain reaction solution;

[0028] In the fifth step, the temperature of the reaction solution is raised to (50.0±1.0)°C, and the reaction time is 4.0h under stirring conditions;

[0029] In the sixth ...

Embodiment 2

[0031] The first step is to dry the woody powdered activated carbon with a particle size of less than 75 microns at a temperature of 110°C for more than 2.0 hours to fully dehydrate;

[0032] In the second step, the fully dehydrated activated carbon obtained in the first step is quickly put into an airtight dimethylamine atmosphere and fumigated for 0.5h for modification to obtain modified woody powdery activated carbon;

[0033] In the third step, the DMDAAC monomer solution with a monomer mass fraction of 20% is fed into a reactor with a stirring device, wherein the formaldehyde content in the DMDAAC monomer solution is 50 mg / L;

[0034] The 4th step, in above-mentioned DMDAAC solution, add the modified wood powdery activated carbon that accounts for 0.1% of total mass fraction, obtain reaction solution;

[0035] In the fifth step, the temperature of the reaction solution is raised to (50.0±1.0)°C, and the reaction time is 4.0h under stirring conditions;

[0036] In the six...

Embodiment 3

[0038] The first step is to dry the woody powdered activated carbon with a particle size of less than 75 microns at a temperature of 110°C for more than 2.0 hours to fully dehydrate;

[0039]In the second step, the fully dehydrated activated carbon obtained in the first step is quickly put into an airtight dimethylamine atmosphere and fumigated for 0.5h for modification to obtain modified woody powdery activated carbon;

[0040] In the third step, the DMDAAC monomer solution with a monomer mass fraction of 20% is fed into a reactor with a stirring device, wherein the formaldehyde content in the DMDAAC monomer solution is 50 mg / L;

[0041] The 4th step, in above-mentioned DMDAAC solution, add the modified wood powdery activated carbon that accounts for 1.3% of total mass fraction, obtain reaction solution;

[0042] In the fifth step, the temperature of the reaction solution is raised to (50.0±1.0)°C, and the reaction time is 4.0h under stirring conditions;

[0043] In the sixt...

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Abstract

The invention discloses a method for reducing formaldehyde contained in an industrial monomer dimethyl diallyl ammonium chloride. The method comprises the following steps: dehydrated activated carbonis fumigated in a closed methylamine or dimethylamine atmosphere to obtain modified activated carbon; a certain amount of modified activated carbon is added into an industrial monomer dimethyl diallylammonium chloride solution with a mass fraction of 20%-65% for adsorption and reaction at a temperature of 35-60 DEG C under a stirring condition, and reaction liquid is filtered while the reaction liquid is hot, so the content of formaldehyde in the reaction liquid is reduced by 50%-80%, and the minimum content of formaldehyde in the monomer DMDAAC solution can reach about 10 mg / L.

Description

technical field [0001] The invention belongs to the refining and purification process of chemical raw materials in the field of chemical production, and specifically relates to a method for reducing trace and trace formaldehyde contained in industrial dimethyl diallyl ammonium chloride DMDAAC monomer solution. Background technique [0002] Dimethyldiallylammonium Chloride (DMDAAC for short) is a quaternary ammonium salt monomer containing two unsaturated double bonds, mainly used to participate in free radical polymerization to prepare its homopolymer and copolymer . The molecular structure of its homopolymer and copolymer has the advantages of high relative density of positive charges on the macromolecular chain, good water solubility, easy control of relative molecular mass, high efficiency and non-toxicity, etc. It is widely used in papermaking, oil exploration, textile, printing and dyeing , daily chemicals, water treatment and electronic chemicals and other fields. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02B01J20/20C02F101/34
CPCC02F1/283B01J20/20C02F1/001C02F2101/34
Inventor 李韵之张跃军王永吉
Owner NANJING UNIV OF SCI & TECH
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