Patent ID: 9181361
Filing Date: 2015-11-10
Classification: B01D,B01J,C07C,C08F,C08J,F25J

Abstract:
1. A method for recovering hydrocarbons from a polyolefin purge gas product, comprising: recovering a polyolefin product comprising one or more volatile hydrocarbons from a polymerization reactor; contacting the polyolefin product with a purge gas to remove at least a portion of the volatile hydrocarbons to produce a polymer product having a reduced concentration of volatile hydrocarbons and a purge gas product enriched in volatile hydrocarbons, wherein the volatile hydrocarbons comprise hydrogen, methane, one or more C compressing the purge gas product to a pressure of about 2,500 kPaa to about 10,000 kPaa; cooling the compressed purge gas product; separating the cooled purge gas product into at least a first product, a second product, and a third product, wherein heat is transferred from the compressed purge gas product to the first product, the second product, and the third product; and recycling at least a portion of at least one of the first product as the purge gas, the second product to the polymerization reactor, or the third product to the purge gas product enriched in volatile hydrocarbons prior to compression.