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Production method of aliphatic polycarbonate resin

A technology of polycarbonate resin and production method, which is applied in the field of polycarbonate synthesis, can solve the problems of increased energy consumption and investment cost of mechanical stirring, impact on large-scale production and application of resin, and low utilization rate of tank reactors, etc., to achieve The effect of high catalyst utilization, stable product weight and simple structure

Active Publication Date: 2009-02-25
JIANGSU ZHONGKE JINLONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is a three-phase reaction of gas, liquid and solid; using a tank reactor, the mixing effect of the system is poor during industrial scale-up, prone to reaction dead angles, and poor product quality stability
In addition, the pressure of the carbon dioxide / epoxide copolymerization reaction is relatively high. During industrial scale-up, with the increase of the reactor volume, the energy consumption of mechanical stirring and the investment cost will increase sharply; moreover, the utilization rate of the tank reactor is low, and its The amount of feed is generally only 1 / 2 to 2 / 3 of the effective volume of the reactor, resulting in high production costs of aliphatic polycarbonate resins and low product market competitiveness, which seriously affects the large-scale production and application of the resin

Method used

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  • Production method of aliphatic polycarbonate resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Taking a loop reactor with a single guide tube as an example, the outer tube of the loop reactor 7 has a diameter of 0.2 meters and a height of 2 meters, and the diameter of the guide tube 8 is 0.14 meters and a height of 1.4 meters.

[0023] The reaction adopts solvent system polymerization, feeds intake in the reaction device: bimetallic catalyst (prepared according to CN1044663A), toluene and propylene oxide, its weight is respectively 1kg, 10kg, 32kg, passes into CO 2 Raise the system pressure to 4MPa, start the CO 2 The compressor 4 circulates the material in the system to keep the internal temperature of the reactor 7 at 60°C; the internal circulation path is: CO 2 Enter from the bottom of the reactor 7 and mix with the material, flow upward from the inside of the draft tube 8, flow to the top of the draft tube 8, and flow down along the area between the draft tube 8 and the outer wall of the reactor; reacted CO 2 Flow out from the top of the reactor 7, enter th...

Embodiment 2

[0026] Adopt the device described in embodiment 1, the reaction adopts non-solvent polymerization, feeds intake in the reaction device: bimetallic catalyst (prepared according to CN1044663A) and propylene oxide, its weight is respectively 1kg, 40kg, passes into CO 2 Make the system pressure rise to 3.5MPa, start the CO 2 The compressor 4 circulates the material in the system to keep the internal temperature of the reactor 7 at 60°C; the internal circulation path is: CO 2 It enters from the bottom of the reactor 7 and mixes with the material, flows upward from the inside of the draft tube 8, and flows downward along the area between the draft tube 8 and the outer wall of the reactor after flowing to the top of the draft tube 8. unreacted CO 2 Flow out from the top of the reactor 7, enter the mist trap 5 through the condenser 6, and the separated propylene oxide loop flows into the reactor, and the CO 2 Pipeline into CO 2 Buffer tank 3, with high pressure CO 2 CO introduced ...

Embodiment 3

[0029] Adopt the polymerization device described in embodiment 1, the reaction adopts non-solvent polymerization, feeds intake in the reaction device: bimetallic catalyst (prepared according to CN1044663A) and oxirane, its weight is respectively 1kg, 40kg, passes into CO 2 Make the system pressure rise to 3.5MPa, start the CO 2 The compressor 4 circulates the material in the system to keep the internal temperature of the reactor 7 at 60°C; the internal circulation path is: CO 2 It enters from the bottom of the reactor 7 and mixes with the material, flows upward from the inside of the draft tube 8, flows to the top of the draft tube 8, and flows down along the area between the draft tube 8 and the outer wall of the reactor. unreacted CO 2 It flows out from the top of the reactor 7, enters the mist trap 5 through the condenser 6, and the separated ethylene oxide loop flows into the reactor, and the CO 2 Pipeline into CO 2 Buffer tank 3, with high pressure CO 2 CO introduced ...

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Abstract

The invention discloses a preparing method of aliphatic polycarbonate resin, which comprises the following steps: choosing carbon dioxide and epoxide as raw material; using ring current reactor intermittent operation; proceeding copolymerization reaction under function of activator; setting the main reacting device as ring current reactor of single guide shell or multiple guide shell, high pressure CO2 container, high pressure CO2 buffer tank, CO2 compressor, condenser and entrainment catcher; putting polymerization catalyst and epoxide into ring current reactor; leading CO2 into the ring current reactor; proceeding copolymerization reaction; setting the operating pressure at 1. 5-8Mpa and reacting temperature at 40-150 deg. c; getting mixed reaction material; proceeding circulatory flow from down to up in the guild shell of the ring current reactor and from up to down out of the guild shell; circulated-utilizing the un-reacting CO2 with the total reacting time at 1-48hr. This invention possesses small investment, high equipment capacity factor and low energy consumption.

Description

technical field [0001] The invention relates to the production of aliphatic polycarbonate, in particular to a method and device for producing aliphatic polycarbonate resin using a loop reactor, and belongs to the technical field of polycarbonate synthesis. Background technique [0002] Carbon dioxide and epoxides can be copolymerized to produce aliphatic polycarbonate resins. The obtained high molecular weight polycarbonate resins can be used as engineering plastics, biodegradable plastic masterbatches, and oil-resistant rubber raw materials. This reaction does not require carbon reduction. Response, low energy consumption, unique product performance, wide application fields, and good market prospects. [0003] The existing carbon dioxide / epoxide copolymerization adopts a tank reactor, and a copolymerization catalyst, epoxide, carbon dioxide, etc. are put into the reactor, and the reaction is carried out under the conditions of 5-8MPa and 40-120°C. The process is a three-ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/34
Inventor 刘保华巴伟徐玉俊徐玉华马雄邦李素晓
Owner JIANGSU ZHONGKE JINLONG CHEM