System and Process for Recovering Gas Emissions Generated in Producing Olefin Polymers

摘要

The present disclosure provides a system for recovering emissions generated from an olefin polymerization process, comprising: a devolatilizer for receiving a fresh sweep gas and emissions generated from the olefin polymerization process and outputting a first fluid and a polyolefin resin; a compression refrigeration unit including a compression device and a first heat exchange device, for receiving said first fluid and outputting a first gas-liquid mixture; a first gas-liquid separation device for separating the first gas-liquid mixture and outputting a first recovery product and a first gas phase composition; a first gas separation device for receiving the first gas phase composition, removing small molecular substances therefrom, and outputting a composition rich in small molecular gases and a second gas phase composition rich in hydrocarbons; and a second gas separation device having a second heat exchange device, a second gas-liquid separation device, and a first gas expansion device.

主权项

1. A system for recovering emissions generated from an olefin polymerization process, comprising:
a devolatilizer for receiving a fresh sweep gas and emissions generated from the olefin polymerization process and outputting a first fluid and a polyolefin resin; a compression refrigeration unit having a compression device and a first heat exchange device, for receiving said first fluid and outputting a first gas-liquid mixture; a first gas-liquid separation device for separating the first gas-liquid mixture and outputting a first recovery product and a first gas phase composition; a first gas separation device for receiving the first gas phase composition, removing small molecular substances therefrom, and outputting a composition rich in small molecular gases and a second gas phase composition rich in hydrocarbons; and a second gas separation device having a second heat exchange device, a second gas-liquid separation device, and a first gas expansion device, wherein the second heat exchange device comprises a first flow channel for receiving the second gas phase composition and feeding the same to the second gas-liquid separation device, a second flow channel for receiving a third gas phase composition that comes from the second gas-liquid separation device and feeding the same to the first gas expansion device, a third flow channel for receiving a liquid phase composition that comes from the second gas-liquid separation device and outputting the same as a second recovery product, and a fourth flow channel for receiving a gas that comes from the first gas expansion device and outputting a fourth gas phase composition which includes a recycle sweep gas that can be added to the fresh sweep gas.