The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 2006
Filed:
Sep. 05, 2002
Applicants:
Raghu S. Narayan, Conroe, TX (US);
Steven T. Coleman, Humble, TX (US);
James H. Walker, Crosby, TX (US);
Inventors:
Raghu S. Narayan, Conroe, TX (US);
Steven T. Coleman, Humble, TX (US);
James H. Walker, Crosby, TX (US);
Assignee:
Equistar Chemicals, LP, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F25D 21/00 (2006.01); F25J 5/00 (2006.01); F28G 9/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for thawing and removing frozen material from a cryogenic separation unit such as that found in an olefin production plant comprising employing a flushing agent to thaw and remove the frozen material, purging the flushing agent with a gas, and removing residual flushing agent with a solvent that is miscible with the flushing agent and has a freezing temperature substantially lower than the flushing agent.