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Composite salt-tolerant hydrophobic associated amphoteric flocculant and preparation method thereof

An amphoteric flocculant and hydrophobic association technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve problems such as environmental pollution, complicated post-treatment, narrow application range, etc., achieve high flocculation performance, excellent salt resistance performance, expand The effect of the field of application

Active Publication Date: 2013-10-09
山东滨州嘉源环保有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

F.Candau et al. used monomers with anionic, cationic and hydrophobic units to copolymerize with acrylamide, and studied the properties of polymer solutions. However, this type of copolymer was synthesized by micellar polymerization, and surface activity was required to be introduced during the synthesis process. agent, the post-processing is complicated and causes environmental pollution
A. Licea-Claverie et al. used anionic hydrophobic monomers to synthesize random hydrophobically associated polyampholytes in aqueous media, but lacked detailed studies on solution properties
At the same time, due to the application of amphoteric polyelectrolytes in water treatment, compared with inorganic coagulants, they still have disadvantages such as high cost and narrow application range.

Method used

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  • Composite salt-tolerant hydrophobic associated amphoteric flocculant and preparation method thereof
  • Composite salt-tolerant hydrophobic associated amphoteric flocculant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, the synthesis of cationic hydrophobic monomer (DMABA)

[0028] In the three-necked flask, add N, N-dimethylacryloyloxybutylamine, n-bromoalkane and acetone in a molar ratio of 1:1:2 in sequence, stir and react at 45°C for 48 hours, and after cooling to room temperature, Wash three times with anhydrous ether, recrystallize twice with ethyl acetate, and dry in vacuum to obtain cationic hydrophobic monomer (DMABA).

[0029] N,N-Dimethacryloyloxybutyl dodecyl ammonium bromide (DMABA12) is obtained when the n-bromoalkane is brominated with n-dodecane;

[0030] N,N-Dimethacryloyloxybutyltetradecylammonium bromide (DMABA14) is obtained when the n-bromoalkane is brominated with n-tetradecane;

[0031] N,N-Dimethacryloyloxybutylhexadecylammonium bromide (DMABA16) can be obtained when n-bromoalkane is brominated with n-hexadecane.

Embodiment 2

[0032] Example 2. Preparation of compound salt-tolerant hydrophobic associative amphoteric flocculant

[0033] In a four-neck reaction flask equipped with condensed water, mechanical stirring and nitrogen inlet, acrylamide (AM), acrylic acid (AA) and N,N-dimethylacryloyloxybutyl dodecyl ammonium bromide (DMABA12 ) is dissolved in an aqueous solution of aluminum trichloride (monomer concentration is 5wt%) according to a molar ratio of 94:3:3, and the pH of the system is adjusted to about 3.0 in the reaction solution. Nitrogen was passed for 30 minutes before the reaction to remove the oxygen in the system, the temperature was raised to 30°C, and 2,2-azo[2-(2-imidazolin-2-yl)propane]dihydro Chloride initiator (VA-044 initiator), polymerization time 24h. That is, the composite salt-tolerant hydrophobic association amphoteric flocculant is obtained.

[0034] The properties of the obtained composite salt-tolerant hydrophobic association amphoteric flocculant solution are as follo...

Embodiment 3

[0043] Acrylamide (AM), acrylic acid (AA) and N,N-dimethylacryloyloxybutylhexadecylammonium bromide (DMABA16 ) is dissolved in an aqueous solution of aluminum trichloride (monomer concentration is 8wt%) according to a molar ratio of 8:1:1, and the pH of the reaction solution is adjusted to about 3.0. Nitrogen was passed for 30 minutes before the reaction to remove oxygen in the system, the temperature was raised to 60°C, and V-501 initiator accounting for 0.02% of the total molar weight of the monomers was added, and the polymerization time was 6 hours. That is, the composite salt-tolerant hydrophobic association amphoteric flocculant is obtained.

[0044] The properties of the obtained composite salt-tolerant hydrophobic association amphoteric flocculant solution are as follows:

[0045] 30℃, shear rate 10s -1 At this time, the apparent viscosity of the polymer solution with a concentration of 0.5g / dL is 50mPa·s, and the viscosity of the polymer solution with a concentration ...

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Abstract

The invention relates to a composite salt-tolerant hydrophobic associated amphoteric flocculant and a preparation method thereof. Acrylamide, acrylic acid and cationic hydrophobic monomer used as raw materials are polymerized at 30-60 DEG C for 6-24 hours by a free-radical polymerization process by using an aluminum trichloride water solution as a polymerization medium to obtain the composite salt-tolerant hydrophobic associated amphoteric flocculant, wherein the pH value of the system is 2-5 or so. The composite salt-tolerant hydrophobic associated amphoteric flocculant prepared by the method has excellent salt tolerance, can solve the problem that the performance indexes of the traditional water-soluble polymer are seriously lowered in a high-salt-content medium or high-salinity wastewater, and has the advantages of high reaction speed and low price of the inoranic coagulant.

Description

technical field [0001] The invention relates to a compound salt-tolerant hydrophobic association amphoteric flocculant and a preparation method thereof, belonging to the technical field of flocculants. Background technique [0002] Amphoteric flocculant is a polymer polyelectrolyte, which is a kind of linear or branched synthetic or natural water-soluble polymer. Its structural unit contains ionizable groups, which can be used as flocculant, thickener, dispersant agent, emulsifier, suspension stabilizer, etc. Due to the effect of charge, the solution properties of polyelectrolytes change with the addition of small molecule electrolytes, and in most cases, the properties of the solution become worse, that is, the salt resistance of polyelectrolyte solutions is poor. [0003] Amphoteric polyelectrolyte flocculants refer to polyelectrolytes that contain both anion and cationic groups in their molecular chains. When the number of positive and negative charges is equal, the ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/34C08F2/44C02F1/56
Inventor 戴平巩清军邹新华赵建芳王丕新
Owner 山东滨州嘉源环保有限责任公司
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