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Structurally-modified polymer flocculants

A structure modifier, water-soluble polymer technology, applied in the direction of flocculation/sedimentation water/sewage treatment, separation methods, chemical instruments and methods, etc., can solve problems such as flocculation of unknown polymer flocculants

Inactive Publication Date: 2003-06-25
ONDEO NALCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it is less common to encounter sludges which, for some reason, cannot be flocculated by known polymeric flocculants

Method used

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  • Structurally-modified polymer flocculants

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Embodiment approach

[0052] The water soluble modified polymers prepared herein above may be cationic, anionic or nonionic. They can be emulsion polymers, dispersion polymers, or gel polymers.

[0053] "Emulsion polymer" and "latex polymer" mean water-in-oil polymer emulsions, comprising cationic, anionic or nonionic polymers according to the invention in the water phase, for hydrocarbon oil and water-in-oil emulsification of the oil phase agent. The opposite emulsion polymers are continuous hydrocarbons and water soluble polymers dispersed in a hydrocarbon matrix. The opposite emulsion polymer is then "inverted" or activated by releasing the polymer from the particle using shear, dilution, and generally another surfactant. See U.S. Pat. No. 3,734,873, incorporated herein by reference. Representative preparations of high molecular weight inverse emulsion polymers are described in U.S. Patent nos. 2,982,749, 3,284,393, and 3,734,873. See also, "Mechanism, Kinetics and Modeling of Acrylamide Rev...

Embodiment 1

[0113] Polymer 1, a control polymer of 15% polymer solids, 90 / 10 mol% AcAm / DMAEA·BCQ dispersion, was synthesized as follows:

[0114] To a 1500 ml reaction flask equipped with a mechanical stirrer, thermocouple, condenser, nitrogen purge tube, and addition port, was added 213 g of acrylamide 49.6% in water (Nalco Chemical Company, Naperville, IL), 56.6 g of dimethylaminoethyl acrylate Ester benzyl chloride quaternary salt (70.9% aqueous solution, Nalco Chemical Company, Naperville, IL), 9 g glycerin, 59 g copolymer of dimethylaminoethyl acrylate benzyl chloride quaternary salt and diallyl dimethyl ammonium chloride (15% aqueous solution, Nalco Chemical Company, Naperville, IL), 0.4 g diethylamine tetraacetic acid, tetrasodium salt, 157 g ammonium sulfate, and 424 g deionized water. The mixture was then heated to 48°C while stirring at 900 rpm. After reaching 48°C, 1.2 g of a 1.0% aqueous solution of 2,2'-azobis(2-amidinopropane) dihydrochloride (V-50, Wako Chemicals, Dallas, ...

Embodiment 2

[0115] Polymer 2 was synthesized using the general procedure described in Example 1, vinyltrimethoxysilane modified 15% polymer solids, 90 / 10 mol% AcAm / DMAEA·BCQ dispersion polymer. The standard procedure was modified by adding 0.25 g of vinyltrimethoxysilane (Huls America, Inc., Bristol, PA) to the reaction mixture 3.5 hours after initiation (approximately 88% conversion). No further improvements were made. The reduced viscosity of the product is 18.3dl / g (in 0.125N NaNO 3 0.045% polymer in solution). Example 3

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Abstract

This invention is directed to structurally-modified water-soluble polymers prepared by initiating polymerization of an aqueous solution of monomers under free radical polymerization conditions to form a polymer solution and adding at least one structural modifier to the polymer solution after at least 30 % polymerization of the monomers has occurred, and to use of the water-soluble cross-linked polymers as flocculating agents.

Description

technical field [0001] The present invention relates to a structurally modified water-soluble polymer prepared by initiating the polymerization of an aqueous monomer solution to form a polymer solution under free radical polymerization conditions and the use of the polymer as a flocculant after at least At least one modifier is added to the polymer solution after polymerization of 30% of the monomers. Background of the invention [0002] Water-soluble polymer flocculants are commonly used to clarify suspensions of proteinaceous or organic matter of a cellulosic nature, such as those found in sewage and industrial plant treatment effluents or in paper mills. [0003] These suspended substances are hydrophilic in nature and often have a specific gravity quite close to that of the aqueous solution in which they are suspended, which differ in a significant way from more hydrophobic mineral suspensions in that physical dehydration steps such as filtration, flotation They are oft...

Claims

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Application Information

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IPC IPC(8): B01D21/01C02F1/56C02F11/14C08F2/10C08F2/38C08F2/44C08F265/00C08F265/04C08F265/10C08J3/24
CPCC08F265/04C08F265/10C08F2/10B03D1/1431C08J3/24
Inventor W·L·惠普尔C·马尔泰什C·约翰逊T·加登多夫A·西瓦库马A·扎加拉
Owner ONDEO NALCO
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