Mixed refrigerant cycle for ethylene recovery

Details Mixed refrigerant cycle for ethylene recovery Mixed refrigerant cycle for ethylene recovery

1994-02-04

1995-01-10

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 40, F25J 306

Patent

active

053795970

ABSTRACT:
A closed-loop mixed refrigerant cycle provides efficient low-level refrigeration for recovering ethylene from a mixed gas feed. Compressed mixed refrigerant vapor is condensed at -20.degree. F. to -50.degree. F. and is subcooled to -175.degree. F. to -225.degree. F. by indirect heat exchange with cold H.sub.2, methane, and expander streams from elsewhere in the ethylene plant. A portion of the subcooled refrigerant may be flashed to provide additional subcooling of the main mixed refrigerant stream. Subcooled mixed refrigerant is subsequently flashed to provide very low temperature level refrigeration for feed condensation and demethanizer overhead condenser duties.

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Kaiser, Victor, et al. "Mixed Refrigerant for Ethylene." Hydrocarbon Processing Oct. 1976:129-31.

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