Ethylene expansion for low temperature refrigeration in polyethylene vent recovery
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United States of America Patent
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Sep 16, 2014
Grant Date -
May 23, 2013
app pub date -
Jul 7, 2011
filing date -
Jul 9, 2010
priority date (Note) -
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Abstract
Provided are processes and systems for recovering hydrocarbons in a vent stream from a polymerization process. The methods and systems may include the recovery of an olefin monomer from a polymerization vent gas using ethylene refrigeration to condense and recover the olefin monomers from the vent gas. In some embodiments, the methods and systems may also include compression and condensation of polymerization vent gas, recompression of ethylene refrigerant, and use of an expander compressor turbine device for ethylene refrigeration.
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