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A kind of preparation method and application of cationic polyacrylamide

A polyacrylamide, cationic technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., to achieve the effect of expanding the application range, uniform viscosity distribution, and good removal effect

Active Publication Date: 2017-07-28
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increasingly complex water environment, traditional flocculants can no longer meet the needs well. Therefore, a new type of flocculant that not only has the effect of traditional flocculants but also has exclusive adsorption effects has been synthesized and prepared for the characteristic pollutants in the water environment. dose is significant

Method used

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  • A kind of preparation method and application of cationic polyacrylamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) At 20-25°C, first mix 1.0g Span80 and 30.0g rapeseed oil into the container evenly;

[0031] (2) Then add the prepared nano-SiO 2 Dispersion (it contains nano-SiO 2 The mass is 5g), dimethyl diallyl ammonium chloride monomer 15.5g (mass fraction is 60%) and acrylamide monomer 20.0g (dissolve it in 20mL distilled water), high-speed stirring to make it mix evenly Emulsify for 30 minutes;

[0032] (3) Add 0.15 g of initiator oxidized hydrogen peroxide and 0.05 g of methyl mercaptan, and emulsify for 30 min;

[0033] (4) After emulsification, add 0.8 mL of complexing agent 1.0 mol / L EDTA aqueous solution;

[0034] (5) Feed nitrogen for 30 minutes to achieve the purpose of removing oxygen in the monomer mixture;

[0035] (6) Place the container in a microwave reactor, turn on the microwave, control the microwave power to 20W, raise the temperature to 60°C, keep the temperature constant, and react for 3 minutes to make it polymerize;

[0036] (7) After the reaction i...

Embodiment 2

[0042] (1) At 20-25°C, first mix 0.6g Span80 and 20.0g soybean oil into the container;

[0043] (2) Then add the prepared nano-SiO 2 Dispersion (it contains nano-SiO 2 The mass is 6g), 25.5g of dimethyl diallyl ammonium chloride monomer (mass fraction is 60%) and 8.5g of acrylamide monomer (dissolve it in 12mL distilled water), stir it at high speed to make it mix evenly Emulsify for 30 minutes;

[0044] (3) Add 0.1 g of initiator hydrogen peroxide and 0.05 g of ethanethiol, and emulsify for 30 min;

[0045] (4) After emulsification, add 0.8 mL of complexing agent 1.0 mol / L EDTA aqueous solution;

[0046] (5) Feed nitrogen for 40 minutes to achieve the purpose of removing oxygen in the monomer mixture;

[0047] (6) Place the container in a microwave reactor for initiation, turn on the microwave, control the microwave power to 40W, heat up to 60°C, then keep the temperature constant, and react for 2 minutes to polymerize;

[0048] (7) After the reaction in the microwave re...

Embodiment 3

[0054] The product obtained in embodiment 2 is applied to Cr in water 6+ Ions, Hg 2+ Removal of ions, phenol, dimethyl phthalate:

[0055] (1) Analysis of Cr in the water to be treated 6+ Ions, Hg 2+ Concentrations of ions, phenol, dimethyl phthalate;

[0056] (2) According to Cr in water 6+ Ions, Hg2+ The concentration of ions, phenol, and dimethyl phthalate is used to calculate the reaction amount of cationic polyacrylamide, and the amount of flocculant cationic polyacrylamide (the product obtained in Example 2) contained in the water is 0.01-20 mg / L.

[0057] (3) The removal process is:

[0058] (1) will contain Cr 6+ Ions, Hg 2+ The water of ions, phenol, and dimethyl phthalate is sent to the reactor, and according to the above reaction ratio, the flocculant cationic polyacrylamide is added to the reactor through the dosing pipe; at the same time, the agitator is started to mix the above water and The flocculant was fully stirred, (stirring at a speed of 350r / min f...

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Abstract

The invention discloses a preparation method and application of cationic polyacrylamide. The preparation method of the cationic polyacrylamide comprises the following steps of: initiating reaction by using a redox initiator in a microwave heating way, wherein nano-SiO2 dispersion liquid, diallyl dimethyl ammonium chloride and acrylamide monomer serve as reaction raw materials and a vegetable oil serves as a continuous phase; introducing nitrogen to expel oxygen, and carrying out reaction for a period of time in a microwave reactor; transferring the product of reaction to a water bath pot, and heating in a reaction system continuously; carrying out emulsion polymerization to generate a cationic polyacrylamide latex, demulsifying the cationic polyacrylamide latex with acetone, washing and purifying with anhydrous ethanol, drying, and smashing to obtain the powdery cationic polyacrylamide. The cationic polyacrylamide can be used for removing more than 40% of Cr<6+> ions, Hg<2+> ions, phenol and dimethyl phthalate out of wastewater. The preparation process of the cationic polyacrylamide is simple, the cationic polyacrylamid (product) prepared by adopting the preparation process has good dissoluvability and can be widely applied to multiple fields such as heavy-metal containing wastewater treatment, organic wastewater treatment and sludge dewatering.

Description

technical field [0001] The invention belongs to the technical field of preparation of water treatment agents and environmental protection engineering, and in particular relates to a preparation method and application of microwave-assisted initiation of novel cationic polyacrylamide. Background technique [0002] At present, my country's water environment is generally polluted, among which heavy metals and organic matter are two important types of pollutants. These pollutants are stable in nature, difficult to decompose, and can be enriched in organisms. They have strong carcinogenic, teratogenic, and mutagenic effects. , so it is necessary to synthesize low-energy and high-efficiency water treatment agents for such pollutants. [0003] At present, water treatment agents are mainly divided into inorganic flocculants, organic flocculants, biological flocculants and composite flocculants. However, with the increasingly complex water environment, traditional flocculants can no l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F226/02C08F4/40C08F2/46C08F2/44C08K3/36C02F1/56
Inventor 张鹏廖为雄任伯帜朱国成张艳君张伟丁文杰
Owner HUNAN UNIV OF SCI & TECH