Abstract: The present invention relates to an aqueous alkanolamine solution and use therein a process for the selective removal of hydrogen sulfide from gaseous mixtures comprising hydrogen sulfide. The aqueous alkanolamine solution consists of—an amino compound with the formula: R1R2NCH2CH(OH)CH2OH wherein R1 and R2 independently represent methyl, ethyl, propyl or isopropyl groups—and bis(2-hydroxyethyl)methylamine,—optionally one or more of a physical solvent, an antifoaming agent, an antioxidant, a corrosion inhibitor, a film former, a chelating agent or a pH adjuster and—water The process for selectively removing 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° F.

Abstract: The present invention relates to an improved process for making hydroxyethyl piperazine compounds especially mono-hydroxyethyl piperazine. The improvement comprises reacting piperazine and an alkylene oxide, preferably ethylene oxide in a reactive distillation column.

Abstract: 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: R1R2NCH2CH(OH)CH2OH wherein R1 and R2 independently 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° F. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.

Abstract: The present invention relates to an aqueous alkanolamine solution demonstrating low volatility comprising 2-di-methylamino-2-hydroxymethyl-1, 3-propanediol useful for removing acid gases from gaseous mixtures. Said aqueous alkanolamine solution may further comprise one or more of an acid or acid-forming compound, another amino compound, an activator, a physical solvent, or one or more other compounds used in gal-liquid treatment practices. 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 said aqueous alkanolamine solution. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.

Abstract: A method for treating liquefied hydrocarbons including acid gases to remove said acid gases while minimizing loss of amine species, said method comprising the steps of contacting the liquefied hydrocarbons with an absorbent aqueous solution of a first amine compound, the first amine compound having the structure: wherein R1 is propane-2,3-diol; R2 is hydrogen, methyl ethyl, 2-hydroxyethyl, or propane-2,3-diol; and R3 is hydrogen, methyl, ethyl, 2-hydroxyethyl or propane-2,3-diol.

Abstract: The present invention relates to an aqueous alkanolamine solution demonstrating low volatility comprising 2-di-methylamino-2-hydroxymethyl-1, 3-propanediol useful for removing acid gases from gaseous mixtures. Said aqueous alkanolamine solution may further comprise one or more of an acid or acid-forming compound, another amino compound, an activator, a physical solvent, or one or more other compounds used in gal-liquid treatment practices. 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 said aqueous alkanolamine solution. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.

Abstract: A method for treating liquefied hydrocarbons comprising acid gases to remove said gases while minimizing loss of amine species, the method comprising the step of contacting the liquefied hydrocarbons with an absorbent aqueous solution of a first amine compound, the first amine compound having the structure: wherein R1 and R2 may each individually be hydrogen, methyl, ethyl, n-propyl, i-propyl, n-butyl, s-butyl, 2-hydroxyethyl or propane-2,3-diol.

Abstract: The present invention relates to a dehydration composition and method of use thereof for drying gas streams, in particular natural gas streams, wherein the dehydration composition comprises one or more polyhydric alcohol. Said polyhydric alcohol preferably has a hydroxyl content equal to or greater than 31 percent and equal to or less than 75 percent of the formula weight of the compound. Said polyhydric alcohol dehydration compositions are particularly suitable for dewatering and desalting gas stream comprising water and one or more salt.

Abstract: 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: R1R2NCH2CH(OH)CH2OH wherein R1 and R2 independently 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° F. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.

Abstract: A method for treating liquefied hydrocarbons including acid gases to remove said acid gases while minimizing loss of amine species, he method comprising the step of contacting he liquefied hydrocarbons with an absorbent aqeuous solution of a first amine compound, the first amine compound having the structure: wherein R1 is hydrogen or propane-2,3-diol and R2 is propane-2,3-diol, or mixtures thereof.

Abstract: 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: R1R2NCH2CH(OH)CH2OH wherein R1 and R2 independently 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° F. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.

Abstract: 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.

Abstract: A method of treating oil and gas streams including hydrogen sulfide (H2S) 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° C.

Abstract: The present invention relates to a novel class of aminopyridine derivatives with the general formula: wherein R1; R2, R3, and R4 are each independently hydrogen, an alkyl group, —(O—CH2—CH2)n-OH wherein n is an integer from 0 to 8, —CH2—(O—CH2—CH2)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 R1; R2, R3, and R4 are 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.

Abstract: A method of treating oil and gas streams comprising H2S and a carbon oxide, the method including the step of treating the oil and gas stream with an amine solution having an alkanolamine and a quaternary ammonium salt, wherein the amine solution selectively removes the H2S over the carbon oxide.

Abstract: The present invention relates to an improved process for making mono- and di-alkoxylated piperazine compounds especially dihydroxyethylpiperazine. The improvement comprises the addition of an acid to the piperazine compound prior to the addition of an alkylene oxide to a reactor wherein the alkoxylated piperazine compound is prepared. Said improvement reduces the concentration of undesirable glycol ether byproducts which contribute undesirable color and foaming of the alkoxylated piperazine compounds.

Abstract: 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: R1R2NCH2CH(OH)CH2OH wherein R1 and R2 independently 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° F. Examples of the gaseous mixtures include natural gas, synthesis gas, tail gas, and refinery gas.

Abstract: A method for treating liquefied hydrocarbons including acid gases to remove the acid gases while minimizing loss of amine species, said method comprising the step of contacting the liquefied hydrocarbons with an absorbent aqueous solution of a first amine compound, the first amine compound having the structure wherein R1 is propane-2,3-diol; R2 is hydrogen, methyl, ethyl, 2-hydroxyethyl, or propane- 2,3 -diol; and R3 is hydrogen, methyl, ethyl, 2-hydroxyethyl or propane-2,3-diol.

Abstract: An improved process for making ethoxylated amine compounds such as ethanolamines. The improvement comprises the addition of an acid to the amine compound prior to the addition of ethylene oxide to a reactor wherein the ethoxylated amine compound is prepared. The improvement reduces the concentration of undesirable glycol ether and/or vinyl ether ethoxylate byproducts which may contribute to undesirable properties, such as color and foaming, of the ethoxylated amine compounds.

Abstract: A method for treating liquefied hydrocarbons including acid gases to remove the acid gases while minimizing loss of amine species, the method comprising the step of contacting the liquefied hydrocarbons with an absorbent aqueous solution of a first amine compound, the first amine compound having the structure wherein R1 is hydrogen, propane-2,3-diol, and mixtures thereof and R2 is propane-2,3-diol.