Propene gas recovery device used in production of polypropene by bulk-polymerization and process thereof

A technology of gas recovery and polypropylene, which is applied in the field of chemical organic polymer compounds with carbon-carbon unsaturated bonds, can solve the problems of unsafe atmosphere, waste of propylene resources, and reduction of enterprise benefits, so as to prevent combustion and explosion hazards, The effect of reducing production costs and improving working conditions

Inactive Publication Date: 2005-11-23
SINOPEC JINLING PETROCHEMICAL CO LTD
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AI Technical Summary

Problems solved by technology

However, the above-mentioned vacuumized propylene-containing gas can only be discharged into the atmosphere. First, it will pollute the environment. Second, it will be unsafe to enter the atmosphere and easily cause hidden dangers such as explosion and combustion.
At the same time, the propylene gas collected in the wet gas cabinet is compressed and condensed into liquid propylene. At the same time, non-condensable gas-nitrogen is brought in, which increases the non-condensable gas in the propylene storage tank and increases the pressure. It must be emptied regularly. There is still a large amount of propylene gas escaping from the exhaust gas in the tank, which causes the above three major defects

Method used

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  • Propene gas recovery device used in production of polypropene by bulk-polymerization and process thereof
  • Propene gas recovery device used in production of polypropene by bulk-polymerization and process thereof

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Embodiment Construction

[0022] See figure 1 :

[0023] 1. When the internal pressure of the mixed gas of propylene and nitrogen with an oxygen content of less than 1% in the flash tank (1) is greater than 0.05 MPa, use positive pressure to directly discharge the mixed gas of propylene and nitrogen into the wet gas cabinet (2) Without opening the vacuum recovery system.

[0024] 2. When the internal pressure in the flash tank (1) is less than 0.05MPa, due to the positive pressure of the wet gas tank (2), the mixed gas of propylene and nitrogen cannot be directly sent into the wet gas tank, and the vacuum recovery system is turned on, that is, the flash is turned off A valve between the kettle (1) and the wet gas holder (2). Simultaneously, turn on the vacuum recovery compressor (9) to evacuate, so that the low-pressure propylene and nitrogen mixed gas in the flash tank (1) will pass through the filter tank (6) to filter impurities successively, the buffer tank (7) buffers, and the gas-liquid separat...

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Abstract

The present invention relates to an equipment for recovering propylene gas produced in the production of polypropylene by using self method and its process. It includes three portions of tail gas compression and condensation system, vacuum recovery system and membrane separation system, the vacuum recovery system can evacuate the low-pressure propylene gas from flash still and pressurize it and feed it into wet gas cabinet instead of emptying, and the membrane separation system can make the nitrogen gas containing propylene gas in the propylene storage tank undergo the separation treatment process to separate propylene gas from nitrogen gas to recover propylene gas instead of emplying.

Description

technical field [0001] The invention belongs to the class of chemical organic macromolecular compound carbon-carbon unsaturated bond compounds, and relates to the technical field of propylene tail gas recovery device and process improvement. Background technique [0002] The liquid-phase bulk polypropylene production process adopts a batch-type, liquid-phase bulk polymerization process. After the polymerization reaction, the polypropylene product in the reactor and the attached propylene should be put into the flash deactivation tank, and the propylene molecules attached to the polypropylene powder are further flashed out in the flash tank, and the propylene gas is in the presence of When the pressure is high, it is introduced into the wet gas holder through the pipeline. When the flash tank is exported into the wet gas tank along with the propylene gas, the pressure in the flash tank drops. Since the wet gas tank has positive pressure, the prop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F6/26C08J11/02
Inventor 潘长禄尚广龙倪文华王玉章潘志安刘钰明
Owner SINOPEC JINLING PETROCHEMICAL CO LTD
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