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Method and application of UV-induced preparation of cationic polyacrylamide

A polyacrylamide and UV-induced technology, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problem of high residual acrylamide monomer, poor treatment effect of heavy metals, and low molecular weight. Good control of problems such as uniform distribution of product intrinsic viscosity, good removal effect, and simple equipment

Active Publication Date: 2017-07-25
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the gradual aggravation of water environment pollution, especially the current heavy metal pollution, higher requirements are put forward for water treatment agents. Therefore, the synthetically prepared heavy metal ions in the water environment have good treatment effect and low cost. Water treatment agent is an urgent problem for water treatment workers
Although the current polyacrylamide preparation process is gradually mature, there are still some areas that can be improved, such as: the problem of poor solubility of the product synthesized by the aqueous solution polymerization method, the problem that the molecular weight cannot be well controlled, and the problem of high residual acrylamide monomer Problems, poor treatment effect on heavy metals in water, etc.

Method used

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  • Method and application of UV-induced preparation of cationic polyacrylamide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) At 20-25°C, first mix 1.0g Span80, 0.5g Tween80, and 30.0g peanut oil into the reaction vessel;

[0030] (2) Then add the prepared nano-SiO 2 Dispersion (it contains nano-SiO 2 The mass is 5g), dimethyl diallyl ammonium chloride monomer 17.5g (mass fraction is 60%) and acrylamide monomer 11.5g (dissolve it in 15mL distilled water), high-speed stirring to make it mix evenly Emulsify for 30 minutes;

[0031] (3) Add 0.12 g of initiator dibenzoyl oxide and 0.09 g of methyl mercaptan, and emulsify for 30 min;

[0032] (4) After emulsification, add 0.5 mL of complexing agent 1.0 mol / L EDTA aqueous solution;

[0033] (5) feed nitrogen for 25 minutes to achieve the purpose of removing oxygen in the monomer mixture;

[0034] (6) It is placed in the ultraviolet light reaction device, irradiated with the mercury ultraviolet lamp of 600W, obtains white latex product after reaction 50min;

[0035] (7) Slowly pour the acetone of 50mL into the white latex product, and carry ...

Embodiment 2

[0039] (1) At 20-25°C, first mix 0.5g of Span80, 0.7g of Tween80, and 20.0g of rapeseed oil into the reaction vessel;

[0040] (2) Then add the prepared nano-SiO 2 Dispersion (it contains nano-SiO 2 The mass is 6g),

[0041] Dimethyl diallyl ammonium chloride monomer 25.5g (mass fraction: 60%) and acrylamide monomer 8.5g (dissolve it in 12mL distilled water), stir at high speed to mix and emulsify uniformly for 30min;

[0042] (3) Add 0.1 g of initiator hydrogen peroxide and 0.08 g of coenzyme A, and emulsify for 30 min;

[0043] (4) After emulsification, add 1.0 mL of complexing agent 1.0 mol / L EDTA aqueous solution;

[0044] (5) feed nitrogen for 40 minutes to achieve the purpose of removing oxygen;

[0045] (6) It is placed in the ultraviolet light reaction device, irradiated with a mercury ultraviolet lamp of 600W, and reacts to obtain a white latex product after 20min;

[0046] (7) Slowly pour the acetone of 50mL into the white latex product, and carry out demulsific...

Embodiment 3

[0051] The product obtained in embodiment 2 is applied to Cr in water 6+ ion, Hg 2+ Ion removal:

[0052] (1) Analysis of Cr in the water to be treated 6+ ion, Hg 2+ concentration of ions;

[0053] (2) According to Cr in water 6+ ion, Hg 2+ The reaction amount of the cationic polyacrylamide is calculated according to the ion concentration, and the amount of the flocculant cationic polyacrylamide (the product obtained in Example 2) contained in the water is 0.10-20 mg / L.

[0054] (3) The removal process is:

[0055] (1) will contain Cr 6+ ion, Hg 2+ The ionic water is transported to the reactor, 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 fully stir the above water body and the flocculant, (at 350r / min speed stirring for 1 minute, and then stirring at a speed of 60r / min for 5 minutes), through the flocculation of flocculant so that the Cr in th...

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Abstract

The invention discloses a method and application of ultraviolet-induced preparation of cationic polyacrylamide. The present invention adopts the mode of ultraviolet light irradiation, with nano-SiO 2 Dispersion liquid, dimethyl diallyl ammonium chloride and acrylamide monomer are used as raw materials, and redox initiator is used to initiate the reaction. Vegetable oil is used as continuous phase, and cationic polyacrylamide latex-like product is formed by emulsion polymerization, which is demulsified by acetone , after washing and purifying with absolute ethanol, dry and pulverize to obtain powdery cationic polyacrylamide product, which is applied to treat Cr in water 6+ Ions, Hg 2+ When ions are used, the removal rate can reach more than 50%. The preparation process of the invention is simple, and the prepared product has good solubility, and can be widely used in multiple industries such as heavy metal wastewater treatment, industrial wastewater treatment, sludge dehydration and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of water treatment agents and environmental protection engineering, and specifically relates to a method for initiating the preparation of cationic polyacrylamide under the condition of ultraviolet light irradiation and its application. Background technique [0002] Cationic polyacrylamide is an important class of organic water treatment agent, which has the advantages of small dosage and good treatment effect, and can be widely used in domestic sewage, industrial wastewater, and water treatment of water plants. However, with the gradual aggravation of water environment pollution, especially the current heavy metal pollution, higher requirements are put forward for water treatment agents. Therefore, the synthetically prepared heavy metal ions in the water environment have good treatment effect and low cost. Water treatment agent is an urgent problem that water treatment workers need to solve. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F226/02C08F220/56C08F4/40C08F2/48C02F1/56C02F1/62
Inventor 张鹏任伯帜张艳君朱国成张伟丁文杰
Owner HUNAN UNIV OF SCI & TECH
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