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Improved polymer blends for dewatering

A technology of polymers and blends, applied in the field of polymer flocculants for the introduction of suspended solids and the manufacture of the composition, can solve the problems of high dosage, the inability of linear polymer flocculants to achieve flocculation characteristics, and increasing environmental burdens.

Inactive Publication Date: 2001-04-04
KEMIRA OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In some applications, acceptable flocculation properties cannot be achieved with linear polymeric flocculants and structured polymers must be used to meet the property requirements
However, structured polymers generally require higher usage levels than linear polymers, so not only does it involve higher costs, but these higher usage rates can add to the burden on the environment

Method used

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  • Improved polymer blends for dewatering
  • Improved polymer blends for dewatering
  • Improved polymer blends for dewatering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Preparation of Structured AMD-AETAC Copolymer Emulsions

[0090] This example describes the preparation of acrylamide (AMD) (60 mole %) and dimethylaminoethyl acrylate, methyl chloride, using N,N'-methylenebisacrylamide crosslinker and isopropanol chain transfer agent Inverse emulsion of structured cationic copolymer of quaternary salt (AETAC) (40 mole %).

[0091] Prepare the water phase by mixing the following ingredients together:

[0092] Acrylamide (50% aqueous solution) 210.00 grams

[0093] Dimethylaminoethyl acrylate, methyl chloride quaternary salt (80% solution) 238.74

[0094] Deionized water 120.00

[0095] Citric acid (anhydrous) 17.76

[0096] Diethylenetriaminepentaacetic acid, pentasodium salt (40%) 0.74

[0097] Isopropanol 2.16*

[0098] N,N'-Methylenebisacrylamide 0.0030**

[0099] Sodium bromate 0.015

[0100] *Equivalent to 0.73% by weight on a monomer basis

[0101] **Equivalent to 10ppm on a monomer basis

[0102] Adjust the pH to 3.5 us...

Embodiment 2-6

[0108] Additional copolymers of AMD and AETAC were prepared following the general procedure described in Example 1, using different relative amounts of comonomer and different amounts of MBA crosslinker, or without any crosslinker. The composition and properties of the resulting linear (Examples 5 and 6) or structured (Examples 2-4) cationic copolymers are listed in Table I below.

[0109] Example

serial number

in copolymer

AETAC's

mol%

chain transfer agent

(wt%)

crosslinking agent

SV

(cps)

SED%

0.001M

NaCl

SED%

1.0M

NaCl

1

40

IPA 0.73%

MBA 10ppm

3.0

2

18

2

35

LA 0.3%

MBA 20ppm

1.9

0

40

3

55

IPA 0.52%

MBA 8ppm

3.0

0

24

4

55

LA 0.2%

MBA 30ppm

1.7

7

63

5

40

IPA 0.64%

non...

Embodiment 7-12

[0120] Preparation of linear or blends of less structured polymers and higher structured polymers

[0121] Using the polymer emulsions of Examples 1-6, six polymer blends were prepared by mechanically mixing the emulsions.

[0122] Mixing is accomplished by weighing the appropriate amount of polymer emulsion to be blended in a glass bottle, making sure that the bottle is about 1 / 4-1 / 3 empty for proper mixing. The capped bottle was then tumbled for approximately 1 hour to ensure thorough mixing was verified visually.

[0123] The compositions and SED values ​​of the resulting blends are listed in Table II below.

[0124] Example

serial number

Blend type

Component 1 / Component 2

polymer

component 1

polymer

component 2

SED

0.001M NaCl

SED

1.0M NaCl

7

Structured /

Structured

Example 4

50wt%

Example 3

50wt%

4

44

8

Structured /

Structured

Examp...

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Abstract

The present invention provides blends of high molecular weight, water soluble cationic structured polymers with linear or less structured high molecular weight, water soluble, cationic polymers. The blend can be used to dewater dispersions of suspended solids, and good dehydration rates can be achieved at lower dosages.

Description

background of the invention [0001] Flocculation is a method of dewatering suspended solids by agglomerating them. Flocculation substantially improves the rate of dewatering of various types of suspended solids including those used in mineral, paper, wastewater treatment and oilfield applications. [0002] Synthetic polymeric flocculants have been used industrially as flocculants for the treatment of suspended solids since the 1950s. However, due to current concerns about environmental protection, sludge incineration, transportation and disposal costs, it is increasingly desirable to provide polymer flocculants that can achieve a satisfactory degree of dehydration at a lower amount than conventional polymer flocculants. [0003] The present invention provides compositions and methods for dewatering suspended solids, including those commonly encountered in wastewater treatment, mining, and paper industries, using high molecular weight, water-soluble, cationic polymeric floccula...

Claims

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Application Information

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IPC IPC(8): C02F1/56C08J3/09C08L101/14
CPCC08L101/14C08J3/09C08J2300/14Y10S524/922C02F1/56
Inventor R·S·法里纳托章迺杰D·A·莫蒂默
Owner KEMIRA OY
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