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Long-branched-chain water-soluble polymer water treatment agent, and preparation method and application thereof

A water-soluble polymer and water treatment agent technology, applied in the direction of flocculation/sedimentation water/sewage treatment, bulk chemical production, etc., can solve the problem of affecting the hydrophobic association performance of polymers, complex polymerization process and product purification process, difficult to remove and other problems, achieve significant turbidity removal rate, excellent water treatment performance, and increase viscosity

Inactive Publication Date: 2012-10-03
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The synthesis of hydrophobically associated water-soluble polymers mainly includes heterogeneous co-solvent method, homogeneous co-solvent method, ultrasonic method, micellar copolymerization method, microemulsion polymerization method, inverse microemulsion polymerization method, free radical interfacial polymerization method, Soap-free emulsion polymerization, living anion polymerization, group transfer polymerization, atom transfer radical polymerization, reversible addition-fragmentation chain transfer polymerization, oxyanion-initiated polymerization and polymer chemical modification, etc., due to oil solubility The polarity of monomers and water-soluble monomers is very different, the incompatibility of the two, and the need to use dispersants or emulsifiers in individual polymerization methods, making the polymerization process and product purification process very complicated
For example, the micellar polymerization method is a common method for preparing hydrophobically associated water-soluble polymers, but a large amount of surfactant needs to be added during the polymerization process, which is difficult to remove and affects the hydrophobic association properties of the polymer.

Method used

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  • Long-branched-chain water-soluble polymer water treatment agent, and preparation method and application thereof
  • Long-branched-chain water-soluble polymer water treatment agent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of long-chain branched water-soluble polymer water treatment agent is as follows:

[0035]Put 98g of acrylamide, 2g of lauryl acrylate, 1g of azobisisobutyronitrile and 100ml of methanol into a stainless steel autoclave, purge with carbon dioxide for 10min to remove the air in the autoclave and then seal the autoclave; add carbon dioxide into the autoclave, Under 50°C and stirring conditions, make the initial pressure in the kettle reach 12Mpa, and carry out free radical precipitation polymerization until the system pressure no longer rises and the reaction ends, and the crude product is obtained after cooling; use the same condition (50°C, 12Mpa) Critical carbon dioxide extracts and purifies the crude product in situ. This process is to continuously inject supercritical carbon dioxide under the same conditions as in the reaction process to take out the residual monomer and solvent in the crude product, remove the residual monomer, and finally obta...

Embodiment 2

[0041] The preparation method of long-chain branched water-soluble polymer water treatment agent is as follows:

[0042] Put 70g of acrylamide, 28g of isooctyl methacrylate, 2g of behenyl acrylate, 0.5g of dibenzoyl peroxide, 0.2g of n-dodecyl mercaptan and 50g of n-heptanol into a stainless steel autoclave , purged with carbon dioxide for 30 minutes to remove the air in the reactor and then sealed the reactor; at 90 ° C and under stirring conditions, put carbon dioxide into the autoclave to make the initial pressure in the autoclave reach 22Mpa, and carry out free radical precipitation polymerization until the system pressure No more rising, the reaction is over, and the crude product is obtained after cooling; the crude product is extracted and purified in situ with supercritical carbon dioxide under the same conditions (90°C, 22MPa). This process is to continuously inject supercritical carbon dioxide into the crude product The residual monomers and solvents are taken out, a...

Embodiment 3

[0046] The preparation method of long-chain branched water-soluble polymer water treatment agent is as follows:

[0047] Put 85g of acrylic acid, 5g of N-vinylpyrrolidone, 5g of isodecyl acrylate, 5g of stearyl acrylate, 3g of dibenzoyl peroxide and 1g of n-dodecyl mercaptan into a stainless steel autoclave, and purge with carbon dioxide for 20min Seal the reactor after removing the air in the reactor; add carbon dioxide into the autoclave under 60°C and stirring conditions to make the initial pressure in the autoclave reach 14MPa, and carry out free radical precipitation polymerization until the system pressure no longer rises and the reaction ends , the crude product was obtained after cooling; the crude product was subjected to carbon in-situ extraction and purification using supercritical carbon dioxide under the same conditions (60°C, 14Mpa). And the solvent is carried out, and the residual monomer is removed to obtain a uniform white powder product, that is, a long-chain...

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Abstract

The invention belongs to the technical field of environmental protection and discloses a long-branched-chain water-soluble polymer water treatment agent and a preparation method and an application of long-branched-chain water-soluble polymer water treatment agent. The preparation method comprises the steps of: adding water-soluble acrylic acid monomers, long-carbon-chain fat monomers, an initiator, a chain transfer agent and a co-solvent into a high-pressure kettle; inputting carbon dioxide into the high-pressure kettle to remove air, and sealing; adding carbon dioxide and carrying out free radical precipitation polymerization under the condition of super-critical carbon dioxide at 50-90 DEG C and 12-22Mpa and under the blending condition; under the condition that the pressure of the system does not increase, cooling to obtain a crude product; and conducting the super-critical carbon dioxide in-situ extraction purification on the crude product under the same condition of the super-critical carbon dioxide to obtain the long-branched-chain water-soluble polymer water treatment agent. The water treatment agent of the invention has the characteristics of fast pH response speed, relatively high turbidity removal rate of sewage, relatively high colority removal rate and relatively high CODCr (chemical oxygen demand measured by dichromate method), simple and convenient synthesis method, high purity of product, no generation of toxic side products and stable room-temperature storage property.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a water treatment agent, in particular to a long-chain branched water-soluble polymer water treatment agent and its preparation method and application. Background technique [0002] Water-soluble polymers are an important class of organic polymer water treatment agents. For example, polyacrylic acid is a linear water-soluble polymer. The carboxyl group on its molecular chain stretches the polymer chain due to electrostatic repulsion in alkaline aqueous solution, and makes the adsorption-functional group originally wrapped in the middle molecule The clusters are exposed to the surface, and these active points adsorb the suspended particles in the solution, forming a bridge between particles, thereby accelerating the settlement of suspended particles. Water-soluble polymers with high relative molecular weight are used as water treatment agents due to the bridging eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C08F220/06C08F220/56C08F222/02C08F222/06C08F226/10C08F220/18C08F220/30C08F2/34
CPCY02P20/54
Inventor 陈鸣才陈嘉
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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