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Preparation method of gelatin grafted acrylamide cation polymeric flocculant

A polymer flocculant, acrylamide cation technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of restricting the sustainable and healthy development of the tanning industry, the residues are not easy to biodegrade, and affect human health, etc., and achieve low cost. , good flocculation effect, fast floc formation effect

Inactive Publication Date: 2015-04-15
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of flocculant has the structural characteristics of relatively large molecular weight and many active functional groups in the molecular chain, it has a fatal weakness. Most of them are slightly toxic and affect human health, and their residues are not easy to be biodegraded. Cause secondary pollution, but restrict the sustainable and healthy development of the leather industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step (1). Graft copolymerization reaction: Add 50.0 grams of dry 100 bloom gelatin to 1L of deionized water, stir evenly, then add 2 grams of ammonium cerium nitrate, react at 35°C for 60 minutes under nitrogen protection, and then add 150 gram of acrylamide, reacted for 6 hours at 45°C to obtain a graft copolymer;

[0024] Step (2). Amination reaction: 50.0 grams of 35% glutaraldehyde solution and 50.0 grams of 33% dimethylamine solution were added to the prepared graft copolymer and stirred at 45°C After reacting for 4.5 hours, cooling and discharging, the gelatin-grafted acrylamide cationic polymer flocculant was prepared.

Embodiment 2

[0026] Step (1). Graft copolymerization reaction: Add 100 grams of dry 250 bloom gelatin to 1L deionized water, stir evenly, then add 10 grams of hydrogen peroxide, react at 50°C for 45 minutes under nitrogen protection, and then add 300 gram of acrylamide, reacted for 4.5 hours at 57°C to obtain a graft copolymer;

[0027] Step (2). Amination reaction: 13 grams of glutaraldehyde solution with a mass content of 50% and 13 grams of dimethylamine solution with a mass content of 40% are added to the prepared graft copolymer, stirred at 55°C React for 3.5 hours, cool and discharge to prepare gelatin grafted acrylamide cationic polymer flocculant.

Embodiment 3

[0029] Step (1). Graft copolymerization reaction: Add 150 grams of dry 280 bloom gelatin to 1L deionized water, stir evenly, then add 20 grams of sodium bisulfite, react at 55°C for 40 minutes under nitrogen protection, and then add 500 grams of acrylamide were reacted for 3 hours at 70° C. to obtain a graft copolymer;

[0030] Step (2). Amination reaction: adding 75 grams of glutaraldehyde solution with a mass content of 45% and 75 grams of dimethylamine solution with a mass content of 37% into the prepared graft copolymer, stirring at 65°C React for 2 hours, cool and discharge to prepare gelatin-grafted acrylamide cationic polymer flocculant.

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Abstract

The invention relates to a preparation method of a gelatin grafted acrylamide cation polymeric flocculant. Current flocculant in leather wastewater treatment is easy to cause secondary pollution to the environment. The method comprises the following steps of: firstly, adding dried gelatin into deionized water; uniformly stirring and adding a catalyst; reacting for 40-60 minutes in the presence of nitrogen; then, adding acrylamide; after reaction, preparing a grafted copolymer; and then, adding a glutaraldehyde liquor and a dimethylamine liquor into the grafted copolymer, stirring and reacting for 2-4.5 hours at 45-65 DEG C, and cooling and discharging to obtain the product. The gelatin grafted acrylamide cation polymeric flocculant prepared by the method provided by the invention is good in flocculating effect, quicker in sedimentation rate, low in cost and small in pollution, and can be completely biologically degraded.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a preparation method of a flocculant, in particular to a preparation method of a gelatin-grafted acrylamide cationic polymer flocculant. Background technique [0002] While the leather industry produces huge economic and social benefits, it also causes certain pollution to the environment. During the tanning process, only 20% of the skin weight of the raw material is converted into finished leather, and the rest is discarded as solid waste such as cutting, cutting, grinding and trimming scraps during the tanning process. At the same time, the sewage discharged by leather enterprises contains a large amount of COD, chromium and suspended solids. These are all important factors that cause serious pollution in the leather industry. [0003] Synthetic organic polymer flocculants used in the treatment of tannery wastewater mainly include anionic and nonionic organic polymer f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F8/32C02F1/56
Inventor 张春晓王成俊姚志通张素玲
Owner HANGZHOU DIANZI UNIV
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