Cationic flocculant and preparation method thereof

A cationic flocculant and cationic monomer technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of incomplete flocculation and direct reuse standards and other problems, to achieve the effect of complete flocculation effect, fast flocculation speed and good affinity

Inactive Publication Date: 2016-04-20
GUANGDONG ESQUEL TEXTILES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of commercial cationic flocculant mainly absorbs anionic dyes through electrostatic attraction. Although it can flocculate most reactive dyes, acid dyes and fluorescent whitening agents, it is prone to incomplete flocculation during flocculation treatment, especially for low concentration Reactive dyes, acid dyes and fluorescent whitening agent wastewater, after flocculation and sedimentation, the filtered water is still a light-colored solution, which cannot meet the direct reuse standard, and further decolorization treatment with ozone aeration or other methods is required

Method used

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  • Cationic flocculant and preparation method thereof
  • Cationic flocculant and preparation method thereof
  • Cationic flocculant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment provides a cationic flocculant. The raw material composition of the cationic flocculation is shown in Table 1.

[0042] Table 1 Raw material composition of cationic flocculant

[0043]

[0044] The preparation method of this cationic flocculant comprises the following steps:

[0045] Add 80g of ethanol and all monomers (hydrophobic monomers, water-soluble monomers and cationic monomers) into the three-necked flask, stir and mix evenly, raise the temperature to 70°C, and add 0.4g of azobisisobutyronitrile, keep warm for 2h An additional 0.2 g of azobisisobutyronitrile was added, and then the temperature was raised to 80° C. to continue the reaction for 7 hours to complete the polymerization reaction, and the temperature was lowered to obtain a cationic flocculant.

Embodiment 2

[0047] This embodiment provides a cationic flocculant. The raw material composition of the cationic flocculation is shown in Table 2.

[0048] The preparation method of this cationic flocculant comprises the following steps:

[0049] Add 40g ethanol, 30g n-propanol and 20g dimethyl diallyl ammonium bromide, 20g allyl trimethyl ammonium chloride, 4g ethyl acrylate, 4g n-octyl methacrylate to the three-necked flask, stir and mix Evenly, heat up to 85°C, and add 0.3g benzoyl peroxide, keep warm for 30min and start to add dropwise the mixed solution of 8g ethyl acrylate, 8g n-octyl methacrylate and 10g n-propanol (2h dropwise), drop After the addition, 0.2 g of benzoyl peroxide was added, and then the temperature was raised to 90° C. to continue the reaction for 5 hours to complete the polymerization reaction, and the temperature was lowered to obtain a cationic flocculant.

[0050] Table 2 Raw material composition of cationic flocculant

[0051]

Embodiment 3

[0053] This embodiment provides a cationic flocculant, and the raw material composition of the flocculant is shown in Table 3.

[0054] Table 3 Raw material composition of cationic flocculant

[0055]

[0056] The preparation method of this cationic flocculant comprises the following steps:

[0057] (1) Add 80g of water, 10g of hexadecyldimethylallyl ammonium chloride, 40g of acryloyloxyethyltrimethylammonium chloride, 2.5g of methyl methacrylate, 0.5g of ethylene into the reaction vessel Triethoxysilane, 4g styrene, 1g diethylene glycol diacrylate, stirred and heated to 75°C;

[0058] (2) After the temperature rises to 75°C, add 0.2g potassium persulfate and 0.2g sodium bisulfite to the reaction vessel, polymerize at this temperature for 30-45min, and then drop the remaining 17.5g methyl Methyl acrylate, 1.5g vinyltriethoxysilane, 12g styrene and 3g diethylene glycol diacrylate were added dropwise within 2 hours; after the dropwise addition, a free radical initiator (0.2...

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Abstract

The invention discloses a cationic flocculant and a preparation method thereof. The cationic flocculant is prepared by carrying out polymerization reaction on reaction monomers comprising a cationic monomer and a hydrophobic monomer under the action of a free-radical initiator, wherein the cationic monomer comprises one or combination of more of acryloyloxyethyl alkyl quaternary ammonium salts and / or allyl alkyl quaternary ammonium salts; the hydrophobic monomer comprises one or combination of more of styrene, acrylonitrile, vinyl acetate, vinyltrimethoxysilane, vinyltriethoxysilane and acrylate; and the free-radical initiator comprises one or combination of more of azodiisobutyronitrile, azodiisohexyl cyanide, azodiisobutylamidine hydrochloride, cyclohexanone peroxide, benzoperoxide and persulfate. The flocculant can adsorb anionic dyes, has favorable affinity with electrically neutral organic matters or organic matters with a small amount of anions, and has excellent flocculating settling effect.

Description

technical field [0001] The invention relates to a cationic flocculant and a preparation method thereof, belonging to the field of wastewater treatment. Background technique [0002] Printing and dyeing wastewater is one of the important bottlenecks restricting the development of the printing and dyeing industry. Printing and dyeing factories will produce 3-5 tons of waste water for every 100 meters of fabric processed. Therefore, in order to achieve sustainable development of the printing and dyeing industry, the pollution problem of the printing and dyeing industry must be solved. [0003] The content of organic matter (including various printing and dyeing auxiliaries, dyes, fluorescent whitening agents, etc.) and inorganic salts contained in printing and dyeing wastewater discharged from different processes is different, and the requirements for water quality in different process stages are also different. For the above It adopts a reasonable classification treatment met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/02C08F220/18C08F222/20C08F220/44C08F220/28C08F220/56C08F220/34C08F220/14C08F230/08C08F212/08C08F222/38C08F2/06C08F2/22C08F2/32C02F1/56C02F101/30
CPCC02F1/56C08F2/06C08F2/22C08F2/32C08F220/34C08F226/02C02F2101/308C02F2101/30C08F220/14C08F230/08C08F212/08C08F222/102C08F220/1803C08F220/1804C08F222/385C08F220/56C08F220/281C08F218/08C08F220/1808C08F220/44C08F222/104C08F220/1802
Inventor 周小明陈玉洪邱孝群张玉高
Owner GUANGDONG ESQUEL TEXTILES CO LTD
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