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Preparing method of lowering residual monomer content of ultra high molecular weight anion-type polyacrylamide

A polyacrylamide, ultra-high molecular weight technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of high toxicity, high content of acrylamide monomers, and inability to meet the requirements of use.

Active Publication Date: 2011-08-17
DONGYING BAOMO ENVIRONMENT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are problems: in the production process of anionic ultra-high molecular weight polyacrylamide products, a composite redox initiation system is generally used, and an alkali hydrolysis process is added after homopolymerization
In the production process, the molecular weight of the product is increased by controlling the polymerization initiation speed, the polymerization reaction is incomplete, the residual acrylamide monomer content is high, and the toxicity is high, which cannot meet the requirements of the water treatment industry and the petroleum industry.

Method used

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  • Preparing method of lowering residual monomer content of ultra high molecular weight anion-type polyacrylamide
  • Preparing method of lowering residual monomer content of ultra high molecular weight anion-type polyacrylamide

Examples

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Embodiment 1

[0013] Example 1: Add 0.9t of acrylamide, 4.1t of desalted water, and 20kg of urea into the preparation kettle. After vigorous stirring, the jacket cools down to 0°C with refrigerant water, which is transported to the polymerization kettle through a delivery pump. Nitrogen for 20 minutes, add potassium persulfate, sodium bisulfite, urea, and water-soluble azo compounds, continue to pass nitrogen for 40 minutes, hold pressure for polymerization, until the temperature does not rise, the polymerization reaction is completed, unload to the storage box for a granulation , add 200kg caustic soda to the hydrolyzer for granulation, and react in the hydrolyzer. After the jacket is heated to 75°C, place it for 1 hour for secondary granulation, transport it to the fluidized bed and pass it into hot air to dry to a solid content of about 90%, and transport to the grinding packaging system. Product quality: solid content ≥ 89%, apparent viscosity 15.0mPa.s (salinity 20000mg / L, temperature ...

Embodiment 2

[0014] Example 2: Add 0.8t of acrylamide, 4.1t of desalted water, 0.1tAMPS, and 5kg of urea into the preparation kettle. After vigorous stirring, the jacket cools down to 0°C with refrigerant water, and transports it to the polymerization kettle through a delivery pump. Pass through high-purity nitrogen for 20 minutes, add potassium persulfate, sodium bisulfite, sodium formate, and water-soluble azo compounds, continue to pass nitrogen for 40 minutes, hold pressure for polymerization, and complete the polymerization reaction until the temperature does not rise. For primary granulation, add 180kg of caustic soda to the hydrolyzer for reaction in the hydrolyzer. After the jacket is heated to 80°C, place it for 1 hour for secondary granulation, transport it to the fluidized bed and dry it with hot air to a solid content of 90%. Left and right, transported to the grinding and packaging system. Product quality: solid content ≥ 89%, apparent viscosity 14.0mPa.s (salinity 32000mg / L, ...

Embodiment 3

[0015] Example 3: Add 0.8 t of acrylamide, 4.1 t of desalted water, 0.2 t of acrylic acid, and 5 kg of urea into the preparation tank. After vigorous stirring, cool the jacket to 0°C with refrigerant water, and then transport it to the polymerization tank through a delivery pump. , pass through high-purity nitrogen for 20 minutes, add potassium persulfate, sodium bisulfite, sodium formate, and water-soluble azo compounds, continue to pass nitrogen for 40 minutes, hold pressure for polymerization, until the temperature does not rise, the polymerization reaction is completed, and unload to the storage box Carry out a granulation, add 180kg caustic soda to the hydrolyzer, and carry out the reaction in the hydrolyzer. After the jacket is heated to 80°C, place it for 2 hours for the second granulation, transport it to the fluidized bed and pass it into hot air to dry to a solid content of 90 % or so, transported to the grinding packaging system. Product quality: solid content ≥ 89%...

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Abstract

The invention relates to a preparing method of lowering residual monomer content of ultra high molecular weight anion-type polyacrylamide. The invention has the technical scheme as follows: acrylamide (AM), 2-acrylamide-2-methylpropane sulfonic acid (AMPS) and acrylic acid (AA) are taken as a synthetic monomer; a kettle-type chunk polymerization technology, a complex initiation system, hydrolyzerposthydrolysis and fluidized bed drying preparation are adopted; acrylamide dry powder is white power-type particle; polyacrylamide colloidal particles in a hydrolyzer are transmitted to a static fluidized bed for drying after pelleting by a secondary pelletizer, are crushed by a grinder and are packaged into bags. The invention has the beneficial effect that the content of a residual monomer is controlled below 0.05%, which can satisfy the technical requirements of three-time adoption, sewage treatment and raw water treatment.

Description

1. Technical field: [0001] The invention relates to a preparation method of a new polymer material, in particular to a preparation method for reducing the residual monomer content of ultra-high molecular weight anionic polyacrylamide. 2. Background technology: [0002] Polyacrylamide, English name polyacrylamide, referred to as polyacrylamide. Acrylamide polymer is a general term for homopolymers and copolymers of acrylamide. In industry, all acrylamide polymers containing more than 50% of acrylamide monomer structural units are generally called polyacrylamide. Polyacrylamide is one of the most widely used water-soluble polymers. Currently commercialized polyacrylamide products include five series of anionic polyacrylamide, cationic polyacrylamide, zwitterionic polyacrylamide, nonionic polyacrylamide and modified superabsorbent resin, with more than 2,000 products. The variety, known as "Baiye Auxiliary", is a very important fine chemical product. The global annual consum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/54C08F2/00C08F4/04C08F4/30C02F1/56
Inventor 任建军刘皓
Owner DONGYING BAOMO ENVIRONMENT ENG CO LTD
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