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Method for copolymerizing carbon dioxide and propylene oxide with circulation flow reactor

A loop reactor and carbon dioxide technology, applied in the field of copolymerization of carbon dioxide and propylene oxide using a loop reactor, to achieve good gas-liquid contact and mass transfer, low production cost, and small kinetic energy loss

Active Publication Date: 2012-09-26
BEIJING RISUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are no relevant literature and patent reports for the synthesis reaction of polycarbonate materials.

Method used

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  • Method for copolymerizing carbon dioxide and propylene oxide with circulation flow reactor
  • Method for copolymerizing carbon dioxide and propylene oxide with circulation flow reactor
  • Method for copolymerizing carbon dioxide and propylene oxide with circulation flow reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] in such as figure 1 In the loop reactor shown, carbon dioxide (commercially available industrial gas with a purity of 99.9%, dehydrated and deoxidized) and propylene oxide (analytically pure, dehydrated and deoxidized) were used as raw materials, and a rare earth three-way catalyst and carboxyl The acid-zinc mixed solution is used as a catalyst. When the reaction temperature is 70°C and the pressure is 35 atmospheres, the reaction time is 4 hours. The reaction products are analyzed by Bruker 300MHz nuclear magnetic spectrum, Nicholas 401 infrared molecular spectrum, and Agilent 7890A gas chromatography. The qualitative and quantitative analysis of each substance was carried out in combination with the separation and purification method, and the results showed that the conversion rate of propylene oxide was 50%, and the selectivity of aliphatic polycarbonate was about 90%. 1 H nuclear magnetic spectrum has characteristic peaks at δ=5.0, 4.2, 3.3~3.8, 1.2, infrared at 174...

Embodiment 2

[0046] In addition to figure 2 The loop reactor shown in place of figure 1In the shown loop reactor, except that three layers of large-pore sieve plates are arranged in the draft tube, the reaction is carried out in the same way as in Example 1, and the same analytical method is used for qualitative and quantitative analysis. The results show that the conversion rate of propylene oxide 60%, the selectivity of aliphatic polycarbonate is about 92%.

Embodiment 3

[0048] in such as image 3 In the loop reactor shown, carbon dioxide, nitrogen (commercially available industrial gas with a purity of 99.9%, after dehydration and deoxidation treatment) and propylene oxide are used as reaction raw materials, and a rare earth three-way catalyst and a mixed solution of zinc carboxylate are used as catalysts, and Dioxane was added as a solvent (analytically pure, and dehydrated and deoxidized). When the reaction temperature was 75°C and the pressure was 35 atmospheres, the reaction time was 7 hours, the conversion rate of propylene oxide was 90%, and the aliphatic polycarbonate The selectivity is about 94%.

[0049] According to the above experimental results, it can be seen that using the loop reactor according to the present invention, especially a large-pore sieve plate is arranged in the draft tube, or a loop reactor with a plurality of holes evenly distributed at a certain height of the draft tube wall Among them, the conversion rate of pr...

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Abstract

The invention belongs to the field of chemical engineering technique and equipment, and particularly relates to a method for continuously producing polycarbonate by copolymerizing carbon dioxide and propylene oxide with a circulation flow reactor. The method comprises the following steps: introducing dry inert gas to replace atmosphere and remove water in the circulation flow reactor; adding propylene oxide, catalyst and carbon dioxide; copolymerizing the carbon dioxide and the propylene oxide under certain temperature and pressure to generate polycarbonate; and separating to obtain the aliphatic polycarbonate product, wherein the unreacted raw materials and gas are redistributed into the circulation flow reactor for cyclic utilization. The circulation flow reactor comprises a reactor shell, a raw material gas inlet, a gas distributor, a guide flow cylinder, a liquid feed port and a gas outlet, wherein a multilayer large-pore screen can be arranged in the guide flow cylinder, so that the circulating flow is divided into at least two stage when the pores of the guide flow cylinder wall are opened. The invention has the advantages of simple structure, low investment, good gas-liquid contact, good mass transfer, short time, high efficiency and the like, and is convenient to operate.

Description

technical field [0001] The invention relates to a method for copolymerizing carbon dioxide and propylene oxide using a loop reactor. Background technique [0002] Using carbon dioxide and propylene oxide as raw materials to synthesize aliphatic polycarbonate materials with high molecular weight and high alternating structure, it has excellent properties of full biodegradation and barrier oxygen penetration, and has been widely used in the fields of food packaging, fresh-keeping, and medicine. application. [0003] At present, the process of copolymerization of carbon dioxide and propylene oxide is mainly produced by using a stirred high-pressure reactor. This process has the disadvantages of high equipment performance requirements and high maintenance and repair costs. [0004] As a new reactor form, the loop reactor has been applied in the field of petrochemical industry, such as heavy oil hydrogenation, biodiesel synthesis, etc. However, there are no relevant literature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/34
Inventor 杨雪岗吉定豪张英伟王朋张新志孙长江穆书生王伟
Owner BEIJING RISUN TECH CO LTD
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