Dow Global Technolgoies LLC

Gerardo Padilla

Christophe R Laroche

John R Dowdle

Timothy D Halnon

Linda L Pirtle

Diego Ortiz Vega

Disclosed is a process for regenerating a hybrid solvent used to remove contaminants from a fluid stream and to provide an improved yield of purified fluid. Said process comprises at least two purification units and at least one regeneration unit wherein regenerated lean hybrid solvent and condensed water from the regeneration unit is used to reclaim additional purified fluid in the second purification unit.

Process for selective removal of acid gases from fluid streams using a hybrid solvent mixture

A method of treating oil and gas streams to remove total organic sulfur or total acid gas including the step of treating the gas stream with a solution of an amine, physical solvent, and water wherein the amine solution may optionally also contain an activator.

Hybrid solvent formulations for total organic sulfur removal and total acidic gas removal

A method of treating oil and gas streams including hydrogen sulfide (HS) comprising treating the gas stream with an aqueous solution of an amine and a physical solvent which, when mixed in equal mass ratio with the amine or amine mixture, display a dielectric constant of at least about 20, wherein the pKa of the amine is at least about 9.0 and the amine boiling point is at least 200&#xb0; C.

[object Object]

The present invention relates to an aqueous alkanolamine solution for the removal of hydrogen sulfide from gaseous mixtures containing hydrogen sulfide. The aqueous alkanolamine solution comprises (i) an amino compound with the formula:RRNCHCH(OH)CHOHwherein Rand Rindependently represent lower alkyl groups of 1 to 3 carbon atoms, (ii) piperazine, and (iii) optionally a physical solvent, wherein said solution does not contain a strong acid. Further, the present invention relates to a process for removing hydrogen sulfide from a gaseous mixture containing hydrogen sulfide, and additionally other acid gases, if present, for example carbon dioxide, comprising the step of contacting the gaseous mixture contain hydrogen sulfide with the aqueous alkanolamine solution, preferably wherein the temperature of the aqueous alkanolamine solution is equal to or greater than 140&#xb0; F. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.

Aqueous absorbent composition for enhanced removal of hydrogen sulfide from gaseous mixtures and method for using the same

The present invention relates to an aqueous alkanolamine solution for the removal of hydrogen sulfide from gaseous mixtures. The aqueous alkanolamine solution comprises (i) an amino compound with the formula: RRNCHCH(OH)CHOH wherein Rand Rindependently represent lower alkyl groups of 1 to 3 carbon atoms and (ii) an acid or acid-forming material having a pKa equal to or less than 8, optionally (iii) another amino compound, and optionally (iv) a physical solvent. Further, the present invention relates to a process for removing acid gases from a gaseous mixture, preferably hydrogen sulfide, comprising the step of contacting the gaseous mixture with the aqueous alkanolamine solution, preferably wherein the temperature of the aqueous alkanolamine solution is equal to or greater than 140&#xb0; F. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.

Aqueous alkanolamine composition and process for the removal of acid gases from gaseous mixtures

The present invention relates to a novel class of aminopyridine derivatives with the general formula: wherein R; R, R, and Rare each independently hydrogen, an alkyl group, &#x2014;(O&#x2014;CH&#x2014;CH2)-OH wherein n is an integer from 0 to 8, &#x2014;CH&#x2014;(O&#x2014;CH&#x2014;CH)n-OH wherein n is an integer from 0 to 8, an hydroxyalkyl group, an aminoalkyl group where the nitrogen can be part of a 5 or 6 ring membered cycle, an alkylene group containing quaternary ammonium, a carboxylic acid and/or a salt thereof, or a sulphonic acid and/or a salt thereof, preferably R; R, R, and Rare each hydrogen. The compounds are useful for removal of hydrogen sulfide and other impurities from fluid streams containing hydrogen sulfide, including selective removal from such streams which also contain carbon dioxide. Examples of the fluid stream include a gas stream, for example natural gas, synthesis gas, tail gas, refinery gas, or from liquid streams such as liquid or liquefied hydrocarbons, for example Liquefied Petroleum Gas or Natural Gas Liquids. 

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Lake Jackson, TX, United States of America

Gerardo Padilla