×

Process for LPG recovery

  • US RE33,408 E
  • Filed: 12/16/1985
  • Issued: 10/30/1990
  • Est. Priority Date: 09/29/1983
  • Status: Expired due to Fees
First Claim
Patent Images

1. In a process for separating propane and heavier hydrocarbons from a gaseous feedstream containing hydrocarbon components of different boiling points wherein said feedstream is cooled and separated into a first vapor fraction and a first liquid fraction and said first liquid fraction is distilled in a deethanizer to form a second vapor fraction and a second liquid fraction, the improvement which comprises .[.expanding and.]. transferring said first vapor fraction to the lower portion of a direct heat exchanger, cooling .Iadd.at least a portion of .Iaddend.said second vapor fraction .Iadd.by passing it through an indirect heat exchanger .Iaddend.to form a substantially liquefied stream, .Iadd.partially flashing at least a portion of said liquefied stream and transferring .[.at least a portion of said liquefied stream.]. .Iadd.it .Iaddend.to the upper portion of said direct heat exchanger whereby said liquefied stream contacts said first vapor fraction to form a third vapor fraction and a third liquid fraction, .[.returning.]. .Iadd.transferring .Iaddend.said third liquid fraction to said deethanizer, .[.and.]. removing said third vapor fraction from said direct heat exchanger .Iadd.and passing said third vapor fraction through said indirect heat exchanger. .Iaddend.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×