Method and Composition for Removal of Mercaptans from Gas Streams

a technology of mercaptan and gas stream, which is applied in the direction of dispersed particle separation, other chemical processes, separation processes, etc., can solve the problems of difficult removal of mercaptans from gas streams, unsatisfactory quantities of mercaptans, and difficulty in removing mercaptans from hydrocarbon gas streams

Inactive Publication Date: 2012-11-08
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented method is that it improves the removal of sulfur-containing gases (H2/CO2) from oil refinery processes while reducing the concentration of other harmful substances like nitrogen oxide (NOx) and carbon monoxide (Cm). This results in better quality products with fewer impurities than traditional methods.

Problems solved by technology

The technical problem addressed in this patent text is how to efficiently separate and recover acid gases including carbon oxynthanes from hydrocarbon gases without causing unwanted side effects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037]A laboratory glass apparatus is used to simulate a typical commercial plant used to remove acid gases from a hydrocarbon stream. The laboratory apparatus consisted of one absorber (used to contact the gas stream with the test scrubbing solution) and one stripper (to regenerate the scrubbing solution). This rig has the absorber and the stripper with absorption and regeneration in a closed solvent cycle. Except for the pressure, which can not be more than a few pounds (psi) above atmospheric because of its glass construction, it has the basic features of its commercial counterpart. Process parameters, such as liquid and gas flow rate, stream temperatures, etc. can be changed as required.

[0038]Three compressed gas cylinders N2 (99%), mercaptan (2000 ppm butyl mercaptan balanced with N2) and hydrogen sulfide (5% balanced with N2) supplied by AIRGAS provide the gas source. Victor compressed gas regulators were used to scale down the cylinders pressures before entering the system at 10

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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 copirses scrubbing preferably the natural gas with an aqueous solution comprising the above compounds followed by a stripping regeneration step.

Description

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Claims

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Application Information

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Owner DOW GLOBAL TECH LLC
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