CO2 responsive hyperbranched polymer and preparation method and application thereof

A hyperbranched polymer, responsive technology, applied in chemical instruments and methods, water/sewage treatment, general water supply conservation, etc., can solve the problems of low solubility, loss of solute extraction, etc., and achieves simple recovery operation and large water flux. , the effect of low energy consumption

Active Publication Date: 2016-10-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PDMAEMA with high molecular weight has high osmotic pressure as the draw solution, but high molecular weight PDMAEMA has low solubility in water and the draw solute will diffuse back to the raw material side, resulting in the loss of draw solute

Method used

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  • CO2 responsive hyperbranched polymer and preparation method and application thereof
  • CO2 responsive hyperbranched polymer and preparation method and application thereof
  • CO2 responsive hyperbranched polymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add BIEM 0.8g (2.75mmol), diethylaminoethyl methacrylate (DEAEMA) 5.1g (27.5mmol), ethyl acetate 5mL (51.1mmol), PMDTETA 54mg (0.3mmol) in the single-necked flask 1 of 25ml, Magnetic stirring, at room temperature, pass N 2 Divide O 2 . Take another 25ml flask II and add 43.5mg (0.3mmol) of CuBr, at room temperature, pass N 2 Divide O 2 . After 30 minutes, under anaerobic conditions, the liquid mixture in the flask I was added to the flask II, and then the flask II was placed in a constant temperature oil bath at 60° C., and reacted for 12 hours. After the reaction was completed, the reaction solution was added to 90 mL of n-hexane (0° C.), and the precipitate was precipitated. The supernatant was poured out, and the precipitate was dissolved in 10 ml of tetrahydrofuran. 2 o 3 As column filler, 45mL tetrahydrofuran is eluent, and the collected eluent is dialyzed with 3500 molecular weight dialysis bag again, and the retentate in the dialysis bag is lyophilized to o...

Embodiment 2

[0045] Add BIEM 0.8g (2.75mmol), diethylaminoethyl methacrylate (DEAEMA) 10.2g (55mmol), ethyl acetate 10mL (102.3mmol), PMDTETA 100mg (0.58mmol) in 25ml single-necked flask I, magnetic Stirring, at room temperature, pass N 2 Divide O 2 . Take another 25ml flask II and add 83.4mg (0.58mol) of CuBr. 2 Divide O 2 . After 30 minutes, under anaerobic conditions, the liquid mixture in flask I was added to flask II, and then flask II was placed in a constant temperature oil bath at 60°C to react for 12 hours. After the reaction was completed, the reaction solution was added to 160 mL of n-hexane (0° C.), and the precipitate was precipitated, and the supernatant was poured out. 2 o 3 As column packing, 80mL tetrahydrofuran was used as eluent, the eluate was collected and then dialyzed with a dialysis bag with a molecular weight of 8000, and the retentate in the dialysis bag was freeze-dried to obtain 7.8 g of hyperbranched PDEAEMA;

[0046] In this example, the conversion rate...

Embodiment 3

[0048] In a 100ml round bottom flask, add DEAEMA 5.6g (30mmol), 2-[(2-{[(dodecylthio)carbonyl]thio}-2-methylpropionyl)oxy]-acrylic acid ethyl Esters 0.46g (1mmol), AIBN 18mg (0.1mmol), 1,4-dioxane 30ml, and seal the flask with a rubber stopper. Pass N into the flask with a needle 2 Divide O 2 After 30 min, the flask was placed in an oil bath at 70° C. for 24 h. Quench the reaction with liquid nitrogen, add 10 mL of chloroform to dilute, then add the diluted reaction solution into 300 mL of n-hexane (0°C), precipitate out, pour off the supernatant, and vacuum-dry the lower layer to obtain the hyperbranched polymer PDEAEMA6 .6g.

[0049] In this example, the conversion rate of the polymerization system is 82%, the number average molecular weight is 8000, and the molecular weight distribution is 1.7. Take 4g PDEAEMA and put it into 10mL water, introduce CO 2 , PDEAEMA is dissolved in water to form a draw solution with a concentration of 0.4g / g (the raw material solution is ...

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Abstract

The invention provides a CO2 responsive hyperbranched polymer. The polymer is prepared through one of the following methods. According to the first method, CO2 responsive monomers, a catalyst, ligand, initiator monomers and solvent serve as raw materials, and the target product is prepared through the ATRP method. According to the second method, CO2 responsive monomers, chain transfer agent monomers, initiator and solvent serve as the raw materials, and the target product is prepared through the RAFT. The CO2 responsive hyperbranched polymer can serve as forward osmosis extract solute, and is specifically applied to the forward osmosis seawater desalination process; CO2 is introduced into an extraction solution, the polymer is dissolved in water to form a high-osmotic-pressure extraction solution, water flux is large, counter diffusion is small, N2 is introduced into the extraction solution, polymer will precipitate and be separated out, the polymer is filtered and recycled to be used for forward osmosis next time, the extraction solute is easy to recycle, energy consumption is low, and the extraction solute can be repeatedly used.

Description

(1) Technical field [0001] The present invention relates to a CO 2 Responsive hyperbranched polymers, methods for their preparation, and applications as forward osmosis uptake of solutes. (2) Background technology [0002] With the acceleration of population growth and industrialization, the problem of scarcity of fresh water resources in the world is becoming more and more serious, which threatens the survival and development of human beings to a certain extent. The increasing shortage of fresh water resources has led more and more countries and regions to vigorously develop seawater desalination technology to obtain fresh water by desalination of sea water. Forward osmosis is a membrane separation process that does not require external pressure as a driving force, but only relies on osmotic pressure, and the membrane pollution is relatively light, and it can continue to operate for a long time without cleaning. It is used in seawater desalination, sewage purification, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/34C08F222/18C08F220/38C08F6/12C02F1/44C02F103/08
CPCC02F1/445C08F6/12C08F220/34C02F2103/08C08L33/14C08F220/382C08F222/18Y02W10/37Y02A20/131
Inventor 张祺付密林王建黎
Owner ZHEJIANG UNIV OF TECH
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