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Device and method for recovering epoxypropane from epoxypropane-carbon dioxide copolymer washing liquid

A technology of propylene oxide and carbon dioxide, applied in the direction of organic chemistry, etc., can solve the problems of high cooling energy consumption and high energy consumption, and achieve the effects of low operating cost, low energy consumption, and avoiding side reactions.

Active Publication Date: 2013-03-27
SEDIN NINGBO ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vacuum rectification system needs to consume high-grade cooling capacity, and at the same time, it needs to install vacuum equipment, which consumes a lot of energy, and the purity of the obtained propylene oxide can only reach 99.5%, and it cannot be directly returned to the polymerization reaction for utilization.

Method used

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  • Device and method for recovering epoxypropane from epoxypropane-carbon dioxide copolymer washing liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of equipment of the present invention reclaims propylene oxide from propylene oxide-carbon dioxide copolymer washing liquid, as figure 1 Shown, comprise liquid-solid separator 1, crude propylene oxide rectification tower 2, methanol recovery tower 3, extractive rectification tower 4, extraction water recovery tower 5 and molecular sieve adsorption tower 6, liquid-solid separator 1 and crude epoxy The middle inlet of the propane rectification tower 2 is connected, the top outlet of the crude propylene oxide rectification tower 2 is connected with the lower inlet of the extractive distillation tower 4, and the bottom outlet of the crude propylene oxide rectification tower 2 is connected with the methanol recovery tower 3 The inlet connection of the extractive distillation tower 4 is connected with the molecular sieve adsorption tower 6, the outlet at the bottom of the extractive distillation tower 4 is connected with the middle part inlet of the extraction water rec...

Embodiment 2

[0030] A method of reclaiming propylene oxide from the propylene oxide-carbon dioxide copolymer washing liquid of the present invention, such as figure 1 As shown, the specific steps are as follows:

[0031] (1) Send the propylene oxide-carbon dioxide copolymer washing liquid into the liquid-solid separator 1 to remove most of the catalyst particles to obtain clear liquid;

[0032] (2) Send the clear liquid into the crude propylene oxide rectification tower 2, control the tower top temperature to 40°C, and the tower top pressure to 103kpa, and separate through the crude propylene oxide rectification tower 2, the purity obtained at the top of the tower is 96.5wt%. The thick propylene oxide, obtains the mixed solution containing methanol at the bottom of the tower;

[0033] (3) Send the crude propylene oxide into the extractive distillation tower 3, control the temperature at the top of the tower to 39°C, and the pressure at the top of the tower to 103kpa, separate through the ...

Embodiment 3

[0040] Same as Example 2, the difference is that in step (2), the temperature at the top of the tower is controlled to be 35°C, the pressure at the top of the tower is 101kpa, and the crude propylene oxide rectifying tower 2 is separated, and the crude epoxy resin with a purity of 95wt% is obtained at the top of the tower. Propane; In the step (3), the temperature at the top of the tower is controlled to be 35° C., and the pressure at the top of the tower is 101 kpa, separated by the extractive distillation tower 3, and the propylene oxide with a purity higher than 99.95wt% is obtained at the top of the tower; in the step (4), the control tower The top temperature is 60°C and the top pressure is 101kpa. After separation by the methanol recovery tower 3, methanol with a purity of more than 99% is obtained at the top of the tower; in step (6), the top temperature is controlled at 40°C and the top pressure is 101kpa.

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Abstract

The invention discloses a device and a method for recovering epoxypropane from epoxypropane-carbon dioxide copolymer washing liquid; the device is characterized in that a liquid-solid separator is connected with an inlet arranged in the middle of a rough epoxypropane rectifying tower; an outlet arranged at the top of the rough epoxypropane rectifying tower is connected with an inlet arranged at the lower part of an extraction rectifying tower; an outlet arranged at the bottom of the rough epoxypropane rectifying tower is connected with an inlet of a methanol recovery tower; an outlet arranged at the top of the extraction rectifying tower is connected with a molecular sieve absorption tower; an outlet arranged at the bottom of the extraction rectifying tower is connected with an inlet arranged in the middle of an extraction water recovery tower; an outlet arranged at the top of the extraction water recovery tower is connected with the inlet arranged in the middle of the rough epoxypropane rectifying tower; and the epoxypropane-carbon dioxide copolymer washing liquid is sequentially sent into the liquid-solid separator, the rough epoxypropane rectifying tower, the extraction rectifying tower and the molecular sieve absorption tower, so as to obtain high-purity epoxypropane which has the purity being higher than 99.96wt% and reaches the polymer grade requirement. The device and the method have the advantages that energy consumption is low, few side reactions and side products are generated and the recovered epoxypropane has high purity.

Description

technical field [0001] The invention relates to a method and equipment for recovering propylene oxide, in particular to an equipment and method for recovering propylene oxide from a propylene oxide-carbon dioxide copolymer washing liquid. Background technique [0002] One of the main raw materials for the synthesis of carbon dioxide-propylene oxide copolymer, carbon dioxide, is the CO produced in many industrial production fields 2 Exhaust gas, discharged into the atmosphere not only causes environmental pollution, but also wastes carbon resources. When carbon dioxide is activated to a high degree under the action of a catalyst, it will undergo a copolymerization reaction with epoxide to form a carbon dioxide-propylene oxide copolymer. After post-treatment, a carbon dioxide resin material is obtained. The synthesis of carbon dioxide-propylene oxide copolymer can convert CO 2 The immobilization of resources not only opens up new carbon resources, alleviates the shortage of ...

Claims

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Application Information

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IPC IPC(8): C07D301/32C07D303/04
Inventor 谷新春颜焕敏王宇光岳金明张庆财刘明亮彭永红王献红
Owner SEDIN NINGBO ENG
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