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:
Sep. 15, 2009
Filed:
Apr. 13, 2004
Wiebe Sjoerd Kijlstra, Amsterdam, NL;
Josephus Norbertus Johannes Jacobus Lammers, Heemstede, NL;
Clas Ingemar Wernersson, Gothenburg, SE;
Wiebe Sjoerd Kijlstra, Amsterdam, NL;
Josephus Norbertus Johannes Jacobus Lammers, Heemstede, NL;
Clas Ingemar Wernersson, Gothenburg, SE;
Shell Oil Company, Houston, TX (US);
Abstract
The invention relates to a process for the removal of, HS and mercaptans from a gas stream comprising these compounds, which process comprises the steps of: (a) removing HS from the gas stream by contacting the gas stream in a H2S-removal zone with a first aqueous alkaline washing liquid to obtain a HS-depleted gas stream and a sulphide-comprising aqueous stream; (b) removing mercaptans from the HS-depleted gas stream obtained in step (a) by contacting the HS-depleted gas stream in a mercaptan-removal zone with a second aqueous alkaline washing liquid to obtain a mercaptan-depleted gas stream and an thiolate—comprising aqueous stream; (c) contacting the combined aqueous streams comprising sulphide and thiolates obtained in step (a) and step (b) with sulphide-oxidizing bacteria in the presence of oxygen in an oxidation reactor to obtain a sulphur slurry and a regenerated aqueous alkaline washing liquid; (d) separating at least part of the sulphur slurry obtained in step (c) from the regenerated aqueous alkaline washing liquid; and (e) recycling the regenerated aqueous alkaline washing liquid to the HS-removal zone in step (a) and to the mercaptan-removal zone in step (b). The invention further relates to a gas-treating unit for the removal of HS and mercaptans and from a gas stream comprising these compounds in a process according to the invention.