Process for monomer recovery from a polymerization process

摘要

The present relates to a process for optimizing the recovery of unreacted monomers from a polymerization process, wherein said process comprises the steps of
recovering a fluid stream generated by the separation of the polyolefin product from the polymerization fluid comprising unreacted monomers and optionally comonomers;contacting said fluid stream in an absorption zone with a scrub liquid comprising at least one C4-10 hydrocarbons, thereby absorbing at least a portion of the unreacted monomers in said scrub liquid; andwithdrawing from said absorption zone (i) a vapor overhead comprising light gas and (ii) an absorber bottoms scrub liquid comprising said C4-10 hydrocarbons and said unreacted monomer; thereby recovering said unreacted monomer in said absorber bottoms scrub liquid comprising said C4-10 hydrocarbons.;The present invention also concerns a process for the recovery of unreacted monomers from a gas phase or slurry polymerization process, and also concerns a process for the production of polyolefins.

主权项

1. A process for recovering unreacted monomers from a gas phase polymerization process comprising:
recovering a fluid stream generated by separation of a polyolefin product from a polymerization fluid comprising unreacted monomers and optionally comonomers by purging the polymerization product with an inert gas; contacting the fluid stream comprising the unreacted monomers, the inert gas and optionally the comonomers in an absorption zone with a scrub liquid comprising at least one C4-10 hydrocarbon, thereby absorbing at least a portion of the unreacted monomers in the scrub liquid; withdrawing from the absorption zone: (i) a vapor overhead comprising the inert gas, and (ii) an absorber bottoms scrub liquid comprising the C4-10 hydrocarbon and the unreacted monomers; and forming a flashed stream by flashing the absorber bottoms scrub liquid, and separating the flashed stream into a vapor containing the unreacted monomers and a liquid comprising the C4-10 hydrocarbon.