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Highly random acrylamide-acrylic acid copolymers

A technology of acrylamide and copolymer, which is applied in the field of copolymers of acrylamide and acrylic acid and their cross-linked products, and can solve problems such as ammonia escape and large amounts of heat energy

Inactive Publication Date: 2018-02-16
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as mentioned above, hydrolysis of the acrylamide functional group leads to ammonia (NH 3 ) escape, so special equipment is required to perform the procedure
In addition, the method requires a large amount of thermal energy

Method used

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  • Highly random acrylamide-acrylic acid copolymers
  • Highly random acrylamide-acrylic acid copolymers
  • Highly random acrylamide-acrylic acid copolymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] A water-in-oil latex was formed using the components shown in Table 1.

[0090] Table 1. w / o latex polymerized components of AM and AA.

[0091]

[0092] A latex was formed by mixing the components of the aqueous and oil phases separately and then combining them in a reaction vessel with vigorous agitation using an overhead paddle mixer followed by sparging the latex with nitrogen. The pH of the aqueous phase was measured to be 3.7. After mixing is complete, the initiator composition is added to the container and the container is sealed. The contents of the vessel were heated to about 40°C with stirring for about 4 hours. The reprocessing material is then added to the container. The resulting neutralized w / o latex was stable after cooling to ambient laboratory temperature and showed no signs of destabilization (segregation, flocculation formation) during the procedure. The latex was observed to be stable on storage under ambient laboratory conditions.

[0093]...

Embodiment 2

[0097] A water-in-oil latex comprising the materials shown in Table 2 was formed using the same procedure outlined above for Example 1 .

[0098] Table 2. w / o latex polymerized components of AM and AA.

[0099]

[0100] The resulting w / o latex was stable after cooling to ambient laboratory temperature and showed no signs of destabilization (segregation, flocculation formation) during the procedure.

[0101] Measured according to the procedure of Example 1, the reduced viscosity (RSV) of the latex is 30dL / g.

[0102] A portion of the latex was diluted to the concentrations shown in Table 3 using a solution of aluminum citrate in 1% NaCl, and the initial viscosity and 5 day / 50°C aged viscosity were measured according to the procedure of Example 1. The results are shown in Table 3.

Embodiment 3

[0104] EOR360 was obtained from TIORCO of Denver, CO. EOR360 is a PAM homopolymer which upon post hydrolysis yields a 70 / 30 mole / mole acrylamide / acrylic acid functionality ratio.

[0105] The polymer had a reduced viscosity (RSV) of 45 dL / g as measured according to the procedure of Example 1.

[0106] The polymer was diluted to the concentration shown in Table 3 using a solution of aluminum citrate in 1% NaCl, and the initial viscosity and 5 day / 50°C viscosity were measured according to the procedure of Example 1. The results are shown in Table 3.

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Abstract

Highly random acrylamide-acrylic acid copolymers are described. Ionic crosslinking of the highly random copolymers in dilute solution results in improved viscosity and gel strength compared to copolymers prepared by conventional methods. The ionically crosslinked copolymers are useful in enhanced oil recovery processes.

Description

technical field [0001] The present invention relates to copolymers of acrylamide and acrylic acid and crosslinked products thereof. Background technique [0002] Polyacrylamide (PAM) and its copolymer with acrylic acid (PAMAA) are well known in the industry for numerous applications. Commercially important applications of these copolymers include their use as flocculants in water treatment or papermaking processes, as rheological additives for water or water-based solutions in applications such as enhanced oil recovery (EOR), in Use as a water absorbent when dry and as a friction reducer in water-based formulations. [0003] PAM and its copolymers are susceptible to chemical, thermal and mechanical degradation in dilute aqueous solutions, such as 1% by weight or less, typically used in EOR applications. Conditions encountered in EOR applications may include one or more of high shear, harsh chemical environments, and temperatures of 70°C and higher. Chemical degradation oc...

Claims

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Application Information

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IPC IPC(8): C09K8/60C09K8/58C09K8/512E21B43/16C08F220/54
CPCC08F2/32C08F220/56C08F220/06
Inventor 斯蒂芬·马鲁朱向阳黄河清
Owner ECOLAB USA INC
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