Anionic high-polymer flocculant and preparation method thereof

An anionic polymer and flocculant technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor salt tolerance and limitations, and achieve the effect of good salt tolerance, wide pH range, and enlarged size

Active Publication Date: 2016-04-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are countless types of flocculants at home and abroad, but most of them are easily affected by the pH value and have poor salt tolerance, so their application is limited.

Method used

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  • Anionic high-polymer flocculant and preparation method thereof
  • Anionic high-polymer flocculant and preparation method thereof
  • Anionic high-polymer flocculant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Add p-aminobenzoic acid to the solvent ethyl acetate and add acid-binding agent triethylamine, stir to fully dissolve p-aminobenzoic acid and heat up to 30°C, then slowly add acryloyl chloride dropwise for 15 minutes After the dropwise addition, the temperature was raised to 45°C, condensed and refluxed for constant temperature reaction for 2 hours, and a mixture of p-acrylamide benzoic acid and triethylamine hydrochloride was obtained; wherein, the mass ratio of p-aminobenzoic acid, acryloyl chloride and triethylamine It is 1:1:0.5.

[0045] (2) The mixture of p-acrylamide benzoic acid and triethylamine hydrochloride prepared in step (1) was washed twice with deionized water at room temperature, and the crude product of p-acrylamide benzoic acid was obtained by suction filtration, which was purely crystallized with ethanol The pure product of p-acrylamide benzoic acid was obtained.

[0046] (3) obtain the aqueous solution of sodium p-acrylamide benzoate with the p...

Embodiment 2

[0052] (1) Add p-aminobenzoic acid to the solvent ethyl acetate and add the acid-binding agent triethylamine, stir to fully dissolve the p-aminobenzoic acid and raise the temperature to 40°C, and slowly add acryloyl chloride dropwise for 25 minutes After the dropwise addition, the temperature was raised to 45°C, condensed and refluxed for constant temperature reaction for 1.5h, and a mixture of p-acrylamide benzoic acid and triethylamine hydrochloride was obtained; wherein, the amount of p-aminobenzoic acid, acryloyl chloride and triethylamine The ratio is 1:1.2:0.7.

[0053] (2) The mixture of p-acrylamide benzoic acid and triethylamine hydrochloride prepared in step (1) was washed twice with deionized water at room temperature, and the crude product of p-acrylamide benzoic acid was obtained by suction filtration, which was purely crystallized with ethanol The pure product of p-acrylamide benzoic acid was obtained.

[0054] (3) obtain the aqueous solution of sodium p-acrylam...

Embodiment 3

[0060] (1) Add p-aminobenzoic acid to the solvent ethyl acetate and add acid-binding agent sodium hydroxide, stir to fully dissolve p-aminobenzoic acid and heat up to 45°C, and slowly add acryloyl chloride dropwise for 30 minutes , after the dropwise addition, the temperature was raised to 50°C, condensed and refluxed for constant temperature reaction for 1 hour, and a mixture of p-acrylamide benzoic acid and triethylamine hydrochloride was obtained; wherein, the mass ratio of p-aminobenzoic acid, acryloyl chloride and triethylamine It is 1:1.2:0.9.

[0061] (2) The mixture of p-acrylamide benzoic acid and triethylamine hydrochloride prepared in step (1) was washed 3 times with deionized water at room temperature, and the crude product of p-acrylamide benzoic acid was obtained by suction filtration, which was purely crystallized with ethanol The pure product of p-acrylamide benzoic acid was obtained.

[0062] (3) obtain the aqueous solution of sodium p-acrylamide benzoate wit...

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Abstract

The invention relates to an anionic high-polymer flocculant and a preparation method thereof. The preparation method comprises the following steps: adding deionized water, a chelator, a chain-transfer agent and sodium p-acrylamidobenzoate into a reactor, regulating the pH value to 5-9, adding sodium ethyl acrylate, introducing N2, adding an initiator, initiating polymerization to obtain a transparent viscous copolymer, cooling to room temperature, washing and drying to obtain the anionic high-polymer flocculant. The anionic carboxyl group contained in the anionic high-polymer flocculant can be combined with colloidal particles in sewage to achieve the settling effect. After the sodium p-acrylamidobenzoate and sodium ethyl acrylate are copolymerized, compared with the common single flocculant, the anionic high-polymer flocculant has the advantages of low consumption, high flocculation speed, wide pH value application range, favorable salt resistance and the like. The flocculating performance experiment result indicates that after the oil field wastewater is treated by the anionic high-polymer flocculant, the chroma residue rate reaches 18.14%, the COD (chemical oxygen demand) removal rate is 83.74% and the turbidity removal rate is 88.09%, which indicates that the anionic high-polymer flocculant has favorable flocculating performance.

Description

technical field [0001] The invention belongs to the field of fine chemicals and relates to a sewage treatment flocculant, in particular to an anionic polymer flocculant and a preparation method thereof. Background technique [0002] With the development of industry and the improvement of people's living standards, people's requirements for water quality are getting higher and higher, and the discharge of industrial wastewater and urban sewage is also increasing; at the same time, industrial wastewater pollution not only destroys the ecological environment, but even endangers the environment. Human health; and water is not an inexhaustible natural resource, it is a limited resource. Therefore, in order to prevent serious economic consequences caused by the lack of water resources, one of the most serious challenges facing mankind today is to protect and purify polluted water resources. At present, an economical and simple water treatment method commonly used at home and abro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/14C08F222/38C08F2/38C02F1/56
CPCC02F1/56C08F2/38C08F222/14C08F222/38
Inventor 郭睿甄建斌程敏杨江月李欢乐刘爱玉李晓芳王超
Owner SHAANXI UNIV OF SCI & TECH
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