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Process for the production of narrowly distributed low molecular weight polymers

A low-molecular-weight, production-method technology, applied in the production of narrow-distribution low-molecular-weight polymers, in the field of polymer production, can solve the problems of difficulty in amplification, long material circulation reaction time, long pipelines, etc., to achieve uniform product quality and production process. The effect of continuous reaction and compact process equipment

Active Publication Date: 2017-01-04
CHANGZHOU XIAOGUO INFORMATION SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The molecular weight distribution of the product is relatively wide, because the operating parameters are not easy to strictly control the product performance and the reproducibility is poor
Cause poor product effect, unstable quality, large dosage and high cost
Can not meet market demand
[0024] From the perspective of reaction engineering, the wide molecular weight distribution of the product is mainly caused by the back-mixing of materials. The tank reactor is a fully mixed tank, and back-mixing is inevitable; It is viscous, and the back-mixing caused by the dragging effect of the stagnant layer on the pipe wall cannot be ignored, and it will also encounter difficulties in scaling up

Method used

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  • Process for the production of narrowly distributed low molecular weight polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1. the production of polyacrylic acid (viscosity-average molecular weight M w 11194)

[0048] The ratio of water, acrylic acid, sodium hypophosphite is 25 / 50 / 1. Pump into the middle flow channel 1 of the steam jet reactor at a speed of 4.95kg / h, the ratio of ammonium persulfate and water is 1 / 13, pump it into the flow channel 3 at a speed of 1.37kg / h, and the steam enters through the flow channel 2 , control steam pressure 0.2mPa, mist temperature 90°C, mist flows into the pipeline reactor to continue the reaction, the reaction product flows out from the lower end of the pipeline, and the residence time is controlled for 30 minutes. Product viscosity average molecular weight M w 11194, number average molecular weight M n 6909, distribution coefficient 1.62, solid content 47%, residual acrylic acid monomer <0.5%.

Embodiment 2

[0049] Embodiment 2. the production of polyacrylic acid (viscosity-average molecular weight M w 6031)

[0050] Change the ratio of water, acrylic acid, and sodium hypophosphite to 12 / 25 / 1. Other conditions are with embodiment 1.

[0051] The viscosity-average molecular weight M of the resulting product polyacrylic acid w 6031, number average molecular weight M n 3950, distribution coefficient 1.53, solid content 47%.

Embodiment 3

[0052] Embodiment 3. the production of polyacrylic acid (viscosity-average molecular weight M w 4342)

[0053] Change the ratio of water, acrylic acid, and sodium hypophosphite to 8 / 16.7 / 1. Other conditions are with embodiment 1. The M of the obtained product polyacrylic acid w 4642.M n 2817, distribution coefficient 1.54, solid content 47%.

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Abstract

The present invention discloses a method for producing narrow distribution low molecular weight, high solids polymers using a steam injection reactor. When the reactants (including monomers, initiators, chain transfer agents and water) pass through the steam jet reactor, they are instantly cut, dispersed, mixed, and heated to the reaction temperature by the high-speed steam. Because the materials are highly dispersed and finely mixed, the reaction speed is extremely fast, and then Flow through a section of pipeline with larger diameter and shorter length, and control the residence time for about 30 minutes to complete the reaction. Product molecular weight distribution coefficient<1.7, solid content>45%, colorless and transparent. The production process of the invention has simple equipment, low investment, convenient operation and control, safety, fast reaction speed, fine control of molecular weight (better than tubular reactor), continuous production and stable quality. The invention is applicable to the production of all water-soluble narrow distribution low molecular weight polymers.

Description

technical field [0001] The invention belongs to the field of polymer production, in particular to the production field of narrow distribution low molecular weight polymers. The polymers include water-soluble polymers, such as: polyacrylic acid homopolymer and its salts, binary and multi-polymer copolymers of acrylic acid and two or more monomers and their salts; acrylamide homopolymer, propylene A binary or multi-polymer copolymer of amides and other monomers; also contains polymers of water-insoluble monomers, such as acrylate polymers. Such polymers are widely used as dispersants, scale inhibitors, anti-water loss agents, and anti-redeposition agents in the fields of circulating cooling water treatment, papermaking, cement, ceramics, detergents, catalysts, and oil fields. [0002] technical background [0003] The Influence of Low Molecular Weight Polymer Molecular Weight on Performance [0004] It is well known that the molecular weight of low-molecular-weight polymers h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/01C08F20/06C08F20/56C08F2/38B01J19/26
Inventor 全易孙玲赵崇敏
Owner CHANGZHOU XIAOGUO INFORMATION SERVICES
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