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Process for removing solvent of aliphatic poly-propylene carbonate

A polypropylene carbonate and aliphatic technology is applied in the field of precipitation of aliphatic polypropylene carbonate, which can solve the problems of complex production process, difficulty in realizing industrialization and high production cost, and achieves simple production process and high production cost. The effect of low cost and production cost reduction

Inactive Publication Date: 2006-10-11
INNER MONGOLIA MENG XI HIGH TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process of this method is complicated, the production cost is high, and it is difficult to realize industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 830Kg of aliphatic polypropylene carbonate polymer containing unreacted propylene oxide and residual catalyst into a reactor with a stirrer equipped with 500L of industrial methanol for preliminary stirring, and seal it after stirring for 1 hour. The fully sealed washing tank is used for secondary washing and desolventization. Add 1200L of industrial methanol for the second washing and stir for 40 minutes. Washing, adding 900L industrial methanol for the third washing, stirring for 30min, pumping out the supernatant and then performing the fourth washing, adding 400L industrial methanol for the fourth washing, stirring for 10min, and pumping the slurry through the slurry pump The slurry is fed into a head tank for centrifugation and drying to obtain an aliphatic polypropylene carbonate polymer with a solvent content of less than 0.2%. Propylene oxide and industrial methanol in the supernatant are separated by rectification and recycled.

Embodiment 2

[0019] Put 830Kg of aliphatic polypropylene carbonate polymer containing unreacted propylene oxide and residual catalyst into a reaction kettle with a stirrer equipped with 500L of analytically pure methanol for preliminary stirring, and seal after stirring for 1 hour Enter the fully sealed washing tank for secondary washing and desolventization, add 1200L of analytical pure methanol for the secondary washing, and stir for 40 minutes. Wash three times, add 900L of analytical pure methanol for the third washing, stir for 30min, then pump out the supernatant and perform the fourth washing, add 400L of analytical pure methanol for the fourth washing, stir for 10min, and pass through the slurry pump Put the slurry into the slurry head tank for centrifugation and drying. An aliphatic polypropylene carbonate polymer having a solvent content of less than 0.1% is obtained. Propylene oxide and analytically pure methanol in the supernatant are separated by rectification and recycled. ...

Embodiment 3

[0021] The analytical pure ethanol of 500L is joined in the reaction kettle with stirrer that 830Kg contains unreacted propylene oxide and the residual catalyst aliphatic polypropylene carbonate polymer and carry out initial stirring, after stirring for 1 hour, enter the whole The sealed washing tank is used for secondary washing and desolventization. For the second washing, 1200L of analytical pure ethanol is added, and the stirring time is 40min. After the viscous polymer becomes powdery, it settles. Washing, adding 900L of analytical pure ethanol for the third washing, stirring for 30min, pumping out the supernatant and then performing the fourth washing, adding 400L of analytical pure ethanol for the fourth washing, stirring for 10min, and pumping the slurry through the slurry pump The material is poured into the slurry head tank for centrifugation and drying. An aliphatic polypropylene carbonate polymer with a solvent content below 0.00% is obtained. Propylene oxide and ...

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PUM

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Abstract

The invention is an extraction method of aliphatic polyester propylene carbonate with CO2 and epoxy compounds, especially for aliphatic polyester propylene carbonate desolvation. The procedure is as followings: put aliphatic polyester propylene carbonate with epoxypropane and relict catalyser in the autoclave. Add the desolvation agent while stiring for many times. Separate and dry to get polyester propylene carbonate, whose relict ash is lower than 1%. This invention is simple-manipualtion, lower cost and easy-industralization.

Description

technical field [0001] The invention relates to a method for purifying aliphatic polypropylene carbonate by polymerization with carbon dioxide and epoxy compounds, in particular to a solvent removal method for aliphatic polypropylene carbonate. Background technique [0002] The greenhouse effect of carbon dioxide has a very large impact on global warming. Aliphatic polypropylene carbonate is a new type of polymer material. At present, the material is mainly synthesized by using carbon dioxide and epoxy compounds. This production process not only successfully solves the problem of carbon dioxide reuse, but also obtains a new Biodegradable plastic. However, after the polymerization reaction is completed, part of the catalyst and unreacted epoxy compounds remain in the polymer. The presence of residual catalysts and unreacted epoxy compounds not only seriously affects the application of the resin, but also has a significant impact on the storage stability of the resin. It nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/34C08G64/40
Inventor 毛国玉张明赵晓江向辉宋伟李云飞赵永胜
Owner INNER MONGOLIA MENG XI HIGH TECH GRP CO LTD
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