Method and system for removing sulphide(s) from sour gas

Abstract

An apparatus for removing sulphide(s) from sour gas comprising contacting sour gas with a treatment agent comprised of make-up triazine. The treatment agent extracts sulphide(s) from the sour gas to sweeten the gas and form a residual solution comprised of a sulphinated component and an alkanolamine component. The sulphinated component of the solution is substantially separated from the alkanolamine component of the solution by decanting. Dithiazine and trithiane is crystallized out of the spent sulphinated component and removed from the process. Aldehyde is added to the remaining alkanolamine component to form a sulphide reactive agent. The sulphide reactive agent is combined with make-up triazine to produce the treatment agent for contacting with the sour gas. The present invention also includes a system for completing the above steps comprising feed means for supplying the treatment agent, H.sub.2 S reactor for contacting the sour gas with the treatment agent, a decanting vessel for separating the sulphinated component from the alkanolamine component, a crystallization unit for crystallization of the dithiazine and trithiane, an aldehyde reactor for adding the aldehyde to the alkanolamine component to form the sulphide reactive agent and a feed line to add the sulphide reactive agent to the treatment agent.

Dependencies are inferred from the claim text.