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Method for removing catalyst in carbon dioxide-epoxypropane copolymer

A technology of propylene oxide and carbon dioxide, which is applied in the field of catalyst removal, can solve the problems of high heavy metal content, affecting product performance, and no catalyst removal method disclosed, and achieve the effect of low heavy metal content and high product purity

Active Publication Date: 2020-09-08
SEDIN NINGBO ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing carbon dioxide-propylene oxide copolymer is synthesized by placing carbon dioxide (CO2) and propylene oxide (PO) in a synthesis reactor, and reacting directly under the action of a catalyst, but the catalyst is not completely removed in the synthesized product , high content of heavy metals, affecting product performance
At present, there is no relevant research report on the removal method of catalyst in carbon dioxide-propylene oxide copolymer at home and abroad.

Method used

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  • Method for removing catalyst in carbon dioxide-epoxypropane copolymer

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specific Embodiment

[0016] A method for removing catalyst in a carbon dioxide-propylene oxide copolymer, such as figure 1 shown, including the following steps:

[0017] (1) Send the propylene oxide-carbon dioxide copolymer and the solvent into the PPC dissolving tank 1, control the temperature in the PPC dissolving tank 1 to 45-70°C, and control the pressure to 0.2-0.5MpgG, and obtain propylene oxide after dissolving - carbon dioxide copolymer mixed liquid, wherein solvent comprises at least one in dichloromethane, chloroform, carbon tetrachloride, toluene and xylene; The feed quality of solvent is propylene oxide-carbon dioxide copolymer feed quality 0.3-0.9 times;

[0018] (2) Send the propylene oxide-carbon dioxide copolymer mixed solution into the static mixer 2 and mix it evenly with the acid solution, and then send it into the high-speed mixing tank 3 for further blending to form an emulsion, wherein the acid solution contains sulfuric acid, hydrochloric acid and benzene At least one aque...

Embodiment 1

[0023] Dissolve 1kg of propylene oxide-carbon dioxide copolymer with a zinc content of 1wt% in 0.8kg of chloroform, add 0.5kg of sulfuric acid solution with a mass concentration of 0.5wt%, emulsify at high speed for 5 minutes, and stand for 5 minutes to separate layers, remove the upper aqueous solution, and use deionized The lower layer solution was washed with water twice until it was neutral, and after drying, a propylene oxide-carbon dioxide copolymer product in which the catalyst was completely removed and the zinc content was 105 ppm was obtained.

Embodiment 2

[0025] Dissolve 1kg of propylene oxide-carbon dioxide copolymer with a zinc content of 0.7wt% in 0.8kg of dichloromethane, add 0.5kg of hydrochloric acid solution with a mass concentration of 2wt%, emulsify at high speed for 10min, stand still for 10min to separate layers, remove the upper aqueous solution, and use The lower layer solution was washed with deionized water twice to neutrality, and after drying, a propylene oxide-carbon dioxide copolymer product in which the catalyst was completely removed and the zinc content was 20 ppm was obtained.

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Abstract

The invention discloses a method for removing a catalyst in a carbon dioxide-propylene oxide copolymer. The preparation method is characterized by comprising the following steps: (1) feeding an epoxypropane-carbon dioxide copolymer and a solvent into a PPC dissolving tank, and dissolving to obtain an epoxypropane-carbon dioxide copolymer mixed solution, wherein the solvent comprises at least one of dichloromethane, trichloromethane, carbon tetrachloride, methylbenzene and xylene; (2) feeding the epoxypropane-carbon dioxide copolymer mixed solution into a static mixer to be uniformly mixed withan acid solution, and then feeding the mixture into a high-speed mixing tank to be further blended to form an emulsion; and (3) sending the emulsion into an oil-water separator for layering, washingthe obtained bottom oil phase to be neutral, and drying to obtain the epoxypropane-carbon dioxide copolymer of which the catalyst is completely removed and the residual heavy metal content is lower than 110 ppm. The method has the advantages that the heavy metal content in the product is low, and the product purity is high.

Description

technical field [0001] The invention relates to a method for removing a catalyst, in particular to a method for removing a catalyst in a carbon dioxide-propylene oxide copolymer. Background technique [0002] One of the main raw materials for the synthesis of carbon dioxide-propylene oxide copolymer (PPC) is carbon dioxide, which is the greenhouse gas that has the greatest impact on global warming. Therefore, controlling the emission of carbon dioxide is also a consensus reached in the world. Carbon dioxide-propylene oxide copolymer (PPC) can consume more than 40% of the total mass of carbon dioxide during the synthesis process, which can reduce a large amount of carbon dioxide emissions. On the other hand, carbon dioxide-propylene oxide copolymer (PPC) is a fully degradable polymer, which has the advantages of low cost, good transparency and gas barrier properties, and excellent processability, and can be widely used in the fields of film and packaging materials , to repla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/40
CPCC08G64/406
Inventor 李雅静娄哲翔蒋瑶王笛刘明亮王业翔宋立新应利诚聂琦王献红周庆海俞天健张志董琬玥孟艳聂涛李伟李永强何欣蔚董奇
Owner SEDIN NINGBO ENG