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:
Nov. 13, 2007
Filed:
Jul. 02, 2004
Vijender K. Verma, Sugar Land, TX (US);
Jichuan HU, Sugar Land, TX (US);
Vijender K. Verma, Sugar Land, TX (US);
Jichuan Hu, Sugar Land, TX (US);
Kellogg Brown & Root LLC, Houston, TX (US);
Abstract
A low-pressure olefins recovery process and plant are described. The feed gasis compressedand distilledat a primary distillation pressure. The overhead streamis chilledat a pressure less than 30 kg/cm(430 psia) to partially condense the overheads. The primary distillation toweris refluxed with at least a portion of the condensate. The overhead vapor is further chilledand partially condensed and the condensateis fed to a demethanizer. The remaining vaporis cooled in a cold sectionand the resultant liquid is phase-separatedand expandedto provide refrigeration for the cold section. The expanded vaporfrom the cold section is recycled to the process gas compressor. The bottoms streamsfrom the primary distillation zone and the demethanizer are fractionated into respective streams consisting essentially of ethylene, ethane, propylene, propane, C's, and C