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Crosslinked cationic polyacrylamide microgranule flocculant containing polyxyethylene branched chain

A polyoxyethylene branched chain, polyacrylamide technology, applied in flocculation/precipitation water/sewage treatment, separation method, precipitation separation, etc., can solve the problems of cumbersome component selection and mixing operations, poor shear resistance, etc. Good flocculation effect and shear resistance, increased light transmittance, obvious economic and social benefits

Inactive Publication Date: 2004-12-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the cationic particle flocculants in the prior art, which still need to be combined with anionic polyacrylamide, which result in cumbersome component selection and mixing operations, and poor shear resistance, and provide a polyoxyethylene branched Chain cross-linked cationic polyacrylamide particle flocculant, by adding ethylenediaminetetraacetic acid chelating agent and water-soluble azo late-stage accelerator to improve monomer conversion rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] ——In a jacketed reactor with a capacity of 1 liter, prepare the oil phase: add 340 grams of No. 120 gasoline, 45.7 grams of sorbitan monopalmitate and 16.5 grams of polyoxyethylene sorbitan monooleate, Start stirring and heat up to 45°C for emulsification for 20 minutes.

[0018] ——Prepare the water phase: add 120 grams of distilled water, 75.0 grams of 85.84mol% acrylamide, 20.0 grams of 8.37mol% acryloyloxyethyltrimethylammonium chloride, 12.0 grams of 2.15mol% acrylamide in a 300ml beaker Acryloyl-terminated polyoxyethylene (400) macromonomer, 6.9 grams of 3.64mol% N, N'-methylenebisacrylamide, after stirring and dissolving, add 10 grams of aqueous solution containing 0.033 grams of disodium edetate 10 grams of aqueous solution containing 0.160 grams of 2,2'-azo(2-amidinopropane) dihydrochloride.

[0019] ——Pour the water phase into the oil phase, raise the temperature to 48°C, and bubble with nitrogen gas for 10 minutes, add 5 g of aqueous solution containing 0.017...

Embodiment 2

[0021] ——In a jacketed reactor with a capacity of 1 liter, prepare the oil phase: add 300 grams of No. 120 gasoline, 48.0 grams of sorbitan monooleate and 25.5 grams of polyoxyethylene sorbitan monostearate , start stirring, and raise the temperature to 35°C for emulsification for 30 minutes.

[0022] ——Prepare the water phase: add 120 grams of distilled water, 40.0 grams of 78.68mol% acrylamide, 20.0 grams of 13.49mol% methacryloxyethyltrimethylammonium chloride, 1.9 grams of 0.58mol% in a 300ml beaker % acryloyl-terminated polyoxyethylene (400) macromonomer, 8.0 grams of 7.25mol% N, N'-methylenebisacrylamide, after stirring and dissolving, add 10 grams of aqueous solution containing 0.005 grams of ethylenediaminetetraacetic acid, 10 grams of aqueous solution containing 0.040 grams of 2,2'-azo[2-(N-n-butyl) amidinopropane] dihydrochloride.

[0023] ——Pour the water phase into the oil phase, raise the temperature to 37°C, and bubble with nitrogen gas for 10 minutes, add 5 g o...

Embodiment 3

[0025] ——In a jacketed reactor with a capacity of 1 liter, prepare the oil phase: add 350 grams of No. 200 gasoline, 47.8 grams of sorbitan monooleate and 17.8 grams of polyoxyethylene sorbitan monooleate, Start stirring and heat up to 35°C for emulsification for 30 minutes.

[0026] ——Prepare the water phase: add 120 grams of distilled water, 75.0 grams of 92.44mol% acrylamide, 4.9 grams of 2.21mol% acryloyloxyethyltrimethylammonium chloride, 7.4 grams of 1.43mol% acrylamide in a 300ml beaker Acryloyl-terminated polyoxyethylene (400) macromonomer, 6.9 grams of 3.92mol% N, N'-methylenebisacrylamide, after stirring and dissolving, add 10 grams of aqueous solution containing 0.033 grams of ethylenediaminetetraacetic acid, containing 0.110 g of 2,2'-azo(2-amidinopropane) dihydrochloride 10 g in water.

[0027] ——Pour the water phase into the oil phase, raise the temperature to 43°C, blow nitrogen gas for 10 minutes, add 5 g of aqueous solution containing 0.011 g of sodium bisulf...

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Abstract

The present invention relates to a polyacrylamide microgranular flocculent containing polyoxyethylene branched chain crosslinked cation. It is a transparent or semitransparent microlatex whose average grain size is 40-90 nm, dispersion coefficient is 0.50-0.70 and 0.1% aqueous solution viscosity is 1.2-2.0 mPa.s, and is obtained by using acrylamide, (methyl) acryloyloxyethyltrimethyl ammonium chloride, acryloyl terminal polyoxyethylene macromonomer and N,N'-methylene diacrylamide through reversed phase microemulsion four-component copolymerization preparation process. Said invention utilizes the addition of EDTA chelating agent and water-soluble azo after accelerating agent to raise monomer conversion rate and obviously raise flocculeting effect.

Description

technical field [0001] The invention relates to the technical field of solid-liquid separation using polymers to flocculate various suspended solids, such as wastewater sludge dehydration, fiber pulp suspended matter retention and the like. Specifically, it is a particulate flocculant containing polyoxyethylene branched cross-linked cationic polyacrylamide. Background technique [0002] In the process of solid-liquid separation, the currently widely used particle flocculation system is based on anion, and the typical representatives are composed of silica particles (5-10nm) / cationic starch and activated bentonite particles (~1μm) / cationic polyacrylamide The two-component particle system, the flocculation efficiency of this type of particle flocculation system is better than the traditional two-component polymer flocculation system, because the particle flocculant is generally negatively charged, and the wastewater suspended matter and pulp fiber are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D21/01C02F1/56C08F2/32
Inventor 彭晓宏沈家瑞盘思伟佘娜
Owner SOUTH CHINA UNIV OF TECH
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