Method and composition for removal of mercaptans from gas streams
US8313718B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 2007 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | May 6, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/306
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composition for removing mercaptan from a gas stream containing at least one acid gas in addition to a mercaptan, the composition comprising a physical and/or chemical solvent for H2S and an inclusion compound for the mercaptan. A process of treating gas stream using the composition. The inclusion compound is selected from the group consisting of, cyclodextrin, cryptand, calixarene, cucurbituril. The chemical solvent may be monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA, diisopropylamine (DIPA), diglycolamine (DGA) and methyldiethanolamine (MDEA). Examples of useful physical solvents include cyclotetramethylene sulfone (sulfolane) and its derivatives, aliphatic acid amides, NMP (n-methylpyrrolidone), N-alkylated pyrrolidones and corresponding piperidone, methanol and mixtures of dialkethers of polyethylene glycols. The method comprises scrubbing preferably the natural gas with an aqueous solution comprising the above compounds followed by a stripping regeneration step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.