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Two types of pH sensitive regenerated polymers and preparation method thereof, as well as regenerated aqueous two-phase system formed by pH sensitive regenerated polymers and application of regenerated aqueous two-phase system

A polymer and polymerization reaction technology, applied in the direction of liquid solution solvent extraction, etc., can solve the problems of increasing the industrial cost of the two-water phase, which is not conducive to the promotion of the two-water phase technology, and is suitable for large-scale promotion and application, efficient recovery, recycling The effect of easy operation

Inactive Publication Date: 2012-02-08
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymers that cannot be recycled will greatly increase the industrial cost of the two-water phase, which is not conducive to the promotion of the two-water phase technology

Method used

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  • Two types of pH sensitive regenerated polymers and preparation method thereof, as well as regenerated aqueous two-phase system formed by pH sensitive regenerated polymers and application of regenerated aqueous two-phase system
  • Two types of pH sensitive regenerated polymers and preparation method thereof, as well as regenerated aqueous two-phase system formed by pH sensitive regenerated polymers and application of regenerated aqueous two-phase system
  • Two types of pH sensitive regenerated polymers and preparation method thereof, as well as regenerated aqueous two-phase system formed by pH sensitive regenerated polymers and application of regenerated aqueous two-phase system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 pH sensitive regenerative polymer P ADB preparation

[0025] In a 250ml Erlenmeyer flask with a stopper, add 120ml of deionized water with a pH of 7.0, 5ml of acrylic acid, 1ml of dimethylaminoethyl methacrylate, and 0.5ml of butyl methacrylate (the molar ratio is 23:2:1), and add Initiator sodium bisulfite, ammonium persulfate each 0.1235g, shake well to dissolve. Infuse nitrogen gas for 10-15 minutes to ensure that there is only inert gas in the conical flask. Seal the mouth of the Erlenmeyer flask with a self-sealing tape, place it in a water-bath shaker at 55°C, and vibrate at 200rpm for 24h. After the reaction, the white colloidal solid at the bottom of the flask was taken out, washed with ethanol and acetone, and dried in a vacuum oven. The white solid of drying gained is polymer P of the present invention ADB . according to 1 HNMR determination of polymer P ADB The actual molar ratio of the three monomers is 8.04:0.58:0.47, and the polymer P is d...

Embodiment 2

[0026] Example 2 pH sensitive regenerative polymer P ADBA preparation

[0027] In a 250ml Erlenmeyer flask with a stopper, add 120ml of deionized water with a pH of 7.0, add 5ml of acrylic acid, 4ml of dimethylaminoethyl methacrylate, 0.5ml of butyl methacrylate, and 1.284ml of propylene alcohol (the molar ratio is 23: 8:1:6), add 0.1235g each of initiator sodium bisulfite and ammonium persulfate, shake well to dissolve. Infuse nitrogen gas for 10-15 minutes to ensure that there is only inert gas in the conical flask. Seal the mouth of the Erlenmeyer flask with a self-sealing tape, place it in a water-bath shaker at 55°C, and vibrate at 200rpm for 24h. After the reaction, the white colloidal solid at the bottom of the flask was taken out, washed with ethanol and acetone, and dried in a vacuum oven. The white solid of drying gained is polymer P of the present invention ADBA . according to 1 HNMR determination of polymer P ADBA The actual molar ratio of the above-mentione...

Embodiment 3

[0028] Example 3 Polymer P ADB and polymer P ADBA recovery experiment

[0029] First weigh the empty centrifuge tube thimble. A 1.25% (w / w) polymer solution was added to the centrifuge tube sleeve, and 0.3 mol / L HCl was added dropwise to adjust the pH until solids were precipitated and the solution became turbid. Continue to add HCl dropwise until the precipitate is completely separated, settles, and the supernatant becomes clear. Measure the pH value of the solution at this time, which is the isoelectric point. Put the centrifuge tube casing into a high-speed centrifuge and centrifuge for 30min at a rotation speed of 10000rpm. After centrifugation, the supernatant was discarded and dried in a vacuum oven until constant weight. After drying, measure the weight of the centrifuge tube casing again, and the difference before is the quality of the recovered polymer. It was determined that the polymer P ADBA The isoelectric point is 3.91, the recovery rate reaches 97.18%, and ...

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Abstract

The invention relates to pH sensitive regenerated polymers I and II. In the polymer I, the viscosityaverage molecular weight is 2.93*10<6>g / mol, the isoelectric point is 2.87, the recovery rate is 98.87 percent, the polymer I is randomly copolymerized by compounds shown in formulae (1), (2) and (3), and the molar ratio of feeding is 23:2:1. In the polymer II, the viscosityaverage molecular weight is 3.37*10<5>g / mol, the isoelectric point is 3.91, the recovery rate is 97.18 percent, the polymer I is randomly copolymerized by compounds shown in formulae (1), (2), (3) and (4), and the molar ratio of feeding is 23: 8: 1: 6. The invention also relates to a related preparation method, an aqueous two-phase system formed by the pH sensitive regenerated polymers, as well as an application of the aqueous two-phase system. The two types of polymers are pH sensitive and reversely soluble, the formed regenerated aqueous two-phase system is pH sensitive, and twenty percent of the two types of phase-forming polymers can be efficiently retrieved, so that the use cost is greatly reduced, the retrieving is simple and convenient, and the pH sensitive regenerated polymers provided by the invention is suitable for large-scale popularization and application.

Description

technical field [0001] The present invention relates to the technical field of phase-forming polymers, more specifically, to the technical field of pH-sensitive regenerative polymers, in particular to two pH-sensitive regenerative polymers, their preparation methods and the formed regenerative two-water phase system and their applications . Background technique [0002] The two-phase aqueous system is generally two polymers or one polymer and one inorganic salt dissolved in water at an appropriate concentration to form a two-phase aqueous solution system that is immiscible under certain conditions. A very promising separation unit operation with broad prospects for industrial application. The formation of two aqueous phase systems is mainly due to the incompatibility between high polymers, which can be divided into two phases under certain conditions. [0003] Since the two phases in the two-water phase system are both aqueous solutions, and the water in the two phases acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/34C08F220/18C08F216/08C08L33/02B01D11/04
Inventor 曹学君颜波
Owner EAST CHINA UNIV OF SCI & TECH
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