Dication polyacrylamide flocculating agent and preparation method thereof

A polyacrylamide and dication technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of unsuitable for high-concentration printing and dyeing wastewater treatment, limited flocculation effect, waste of active groups, etc., and achieve excellent stability and flocculation High efficiency, good flocculation effect and low cost

Inactive Publication Date: 2009-11-11
WUJIANG HENGMAO ELECTRIC
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Acrylamide is widely used as a flocculant monomer. It has two active groups, a carbon-carbon main chain and an amide side chain, which are easy to polymerize. However, the cationic polyacrylamide flocculant is only a single use of acrylamide. The active group is the self-polymerization of

Method used

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  • Dication polyacrylamide flocculating agent and preparation method thereof
  • Dication polyacrylamide flocculating agent and preparation method thereof
  • Dication polyacrylamide flocculating agent and preparation method thereof

Examples

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Embodiment 1

[0026] The preparation method of the double cationic polyacrylamide flocculant according to this embodiment includes the following steps:

[0027] (1) Take 71g of acrylamide and dissolve it in 100g of distilled water to obtain an acrylamide solution, add the solution to a 1L four-necked flask, and then adjust the pH of the acrylamide solution to 8 with 1mol / L sodium hydroxide aqueous solution ~9.

[0028] (2) At room temperature, add 80g of 38% formaldehyde solution dropwise to the above acrylamide solution over 40 minutes, heat the solution to 50°C, and after reacting for 2.5 hours, add 120g of 40% formaldehyde solution dropwise to the flask. For the methylamine solution, continue to react at 50°C for 2.5 hours, then add 90 g of 98% dimethyl carbonate solution, and react at 50°C for 1.5 hours to obtain a semi-finished product solution.

[0029] (3) Take 146g of semi-finished product solution, mix it with 200g 79% trimethacryloxyethyl ammonium chloride solution, heat to 60℃, add 1...

Embodiment 2

[0031] The preparation method of the double cationic polyacrylamide flocculant according to this embodiment includes the following steps:

[0032] (1) Take 71g of acrylamide and dissolve it in 100g of distilled water to obtain an acrylamide solution, add the solution to a 1L four-necked flask, and then adjust the pH of the acrylamide solution to 8 with 1mol / L sodium hydroxide aqueous solution -9.

[0033] (2) At room temperature, add 80g of 38% formaldehyde solution dropwise to the above acrylamide solution over 40 minutes, heat the solution to 50°C, and after reacting for 2.5 hours, add 120g of 40% formaldehyde solution dropwise to the flask. The methylamine solution continues to react at 50°C for 2.5 hours, then 90 g of 98% dimethyl carbonate solution is added, and the reaction is carried out at 50°C for 1.5 hours to obtain the semi-finished product solution of the present invention.

[0034] (3) Take 146g semi-finished product solution and mix it with 190g 79% trimethacryloxyet...

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Abstract

The invention relates to a dication polyacrylamide flocculating agent and preparation method thereof. More than two-thirds of structural units of flocculating agent copolymer are cationization acrylamide, and methyl carbonate quaternary amine ions are introduced into the copolymer. The flocculating agent of the invention has higher hydrophobic nature, favorable flocculation effect, acid resistance, alkali resistance and wide range of suitable pH value, and can be used for treating high concentration dyeing and desizing wastewater; and besides, the inventory rating of the flocculating agent is low, and therefore the use cost can be reduced. The preparation method of the invention simultaneously utilizes the two active groups, namely side-chain amido of acrylamide to generate methyl carbonate quaternary ammoniated cationic acrylamide monomer by Menez reaction, a main chain and trimethyl acyloxy ethide trimethyl ammonium chloride cationic monomer are copolymerized, and the method of environmentally friendly one pot boiling is adopted; and the operation is simple, the cost is low, and the obtained flocculating agent has favorable stability and flocculation effect.

Description

Technical field [0001] The invention relates to an organic flocculant and a preparation method thereof, in particular to a cationic polyacrylamide flocculant and a preparation method thereof. Background technique [0002] For the treatment of mixed wastewater in the printing and dyeing industry, the currently widely used inorganic flocculants such as polyaluminum chloride, polyferric sulfate, etc. and organic flocculants such as polyacrylamide can only treat mixed printing and dyeing wastewater with low concentration and low pH value. It is suitable for the treatment of high-concentration printing and dyeing wastewater (COD is above 20000mg / L, which contains a lot of non-degradable carbohydrates, fats, proteins, cellulose and other organic matter). [0003] The Chinese invention patent with the patent number "ZL03133998.0" and the name "a cationic polymer flocculant and its preparation method" discloses a flocculant which is quaternary dimethylaminoethyl methacrylate The copolyme...

Claims

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Application Information

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IPC IPC(8): C02F1/56C08F220/56C08F2/00
Inventor 沈自强张健
Owner WUJIANG HENGMAO ELECTRIC
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