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| Number | Title | Issue Date |
| 6740230 | Method for removing mercaptans from fluid fluxes The disclosure concerns a process for removing mercaptans from fluid streams comprising same, especially from hydrocarbon gas streams, for example natural gas, synthesis gas from heavy oil or heavy residues or refinery gas, or else from liquid hydrocarbons, for exam... | 05/25/2004 |
| 6531103 | Process for removing sulfur compounds from gas and liquid hydrocarbon streams The present invention provides a process for removing sulfur compounds including sulfur in the (-2) oxidation state such as mercaptans, dialkyl sulfides, carbonyl sulfide, hydrogen sulfide, thiophenes and benzothiophenes, from liquid or gas feed streams, ... | 03/11/2003 |
| 6096280 | Natural gas treatment process Hydrogen sulfide is removed from gas streams by reaction with sulfur dioxide in an autogeneously-formed aqueous acid medium according to the equation: SO2 +2H2 S.fwdarw.2H2 O+3S the sulfur being removed from the aqueous ph... | 08/01/2000 |
| 5744024 | Method of treating sour gas and liquid hydrocarbon Reaction of 1,3,5-tri-substituted-hexahydro-1,3,5-triazine is accelerated in H2 S scavenging by the addition of quaternary ammonium compound. The preferred hexahydro triazines are 1,3,5-tri-methyl-hexahydro-1,3,5-triazines and 1,3,5-tri-me... | 04/28/1998 |
| 5622681 | Dialysis separation of heat stable organic amine salts in an acid gas absorption process There is disclosed an organic amine scrubbing process for acid gas abatement of gas streams. The process comprises Donnan dialysis of an absorbent solution to separate and convert organic amine heat stable salts back to free amine absorbent using an anion... | 04/22/1997 |
| 5433934 | Method for simultaneous absorption of sulfur dioxide and nitric oxide from flue gas The simultaneous abatement of NO and SO2 in flue gas is provided by an absorption process and apparatus utilizing an absorbent composition comprising an aqueous solution of chelates and sulfite salt for NO abatement and amine SO2 abs... | 07/18/1995 |
| 5413627 | Process for the selective removal of inorganic and/or organic sulfur compounds For the selective removal of sulfur from gases, a physical scrubbing agent is used, comprising a heterocycle having five or more ring atoms, which contains two heteroatoms, one of which is nitrogen and the other of which is oxygen or nitrogen; and the het... | 05/09/1995 |
| 5378441 | Method to scavenge hydrogen sulfide from natural gas Hydrogen sulfide is removed from natural gas by contacting the natural gas with a scrubber oil that absorbs the hydrogen sulfide. The natural gas typically contains some water, or water can be added, and the resulting mixture is used to form a water-in-sc... | 01/03/1995 |
| 5342593 | Process for absorption of sulfur compounds from fluids Sulfur dioxide is removed from a fluid containing SO2 by employing as an absorbent therefor an aqueous solution of compound represented by Formula I: ##STR1## wherein X is --O--, --NR1 --, or --N.dbd.; each Y is independently ... | 08/30/1994 |
| 5236678 | Process for absorption of sulfur compounds from fluids using piperidines Sulfur dioxide is removed from a fluid containing SO2 by employing as an absorbent for the SO2 an aqueous solution of a compound represented by Formula I: ##STR1## wherein each Y is independently --(CR22)--... | 08/17/1993 |
| 5098681 | Process for absorption of sulfur compounds from fluids Sulfur dioxide is removed from a fluid containing SO2 by employing as an absorbent therefor an aqueous solution of compounds represented by Formulas I and II: ##STR1## wherein each R1 or R2 is independently hydrogen; ... | 03/24/1992 |
| 5019365 | Quaternary polyamines as sulfite oxidation inhibitors Inhibitors of oxidation of sulfites to sulfates in sulfur dioxide scrubbing solutions are disclosed. The inhibitors are cationic polyelectrolytes which are water soluble, have a molecular weight of at least 10,000 daltons and contain quaternary amine grou... | 05/28/1991 |
| 4861567 | Methods of reducing NOx and SOx emissions from combustion systems The present invention relates to methods for selectively reducing NOx so that nitrogen can be removed from emission effluent streams and NOx emissions can be reduced to very low levels. In addition, the present invention teaches a me... | 08/29/1989 |
| 4802973 | Removal of hydrogen sulphide Hydrogen sulphide is scavenged from a feedstock comprising crude oil and hydrogen sulphide by adding a compound of general formula: ##STR1## to the feedstock. X and Y are carbon or nitrogen atoms and the interatomic bond is triple or double as approp... | 02/07/1989 |
| 4783327 | Sulfur dioxide removal from gas streams using hydroxyalkyl substituted piperazinones A method of removing SO2 from a gas stream containing the same by absorbing the SO2 in an aqueous solution containing a 4-(2-hydroxyalkyl)-2-piperazinone compound or an alkyl or aryl substituted derivative thereof. These compounds pr... | 11/08/1988 |
| 4693875 | Process for recovery of hydrogen and abstraction of sulfur A process of abstracting sulfur from H2 S and generating hydrogen is disclosed comprising dissolving Pd2 X2 (μ-dppm)2 in a solvent and then introducing H2 S. The palladium complex abstracts sulfur, f... | 09/15/1987 |
| 4524050 | Catalytic hydrolysis of carbonyl sulfide Hydrolysis of COS in gas streams to H2 S and CO2 can be improved by using certain bicyclo tertiary amine catalysts. Bicyclo tertiary amine catalysts can enhance COS hydrolysis in an acid gas removal solvent in the liquid phase or on ... | 06/18/1985 |
| 4482529 | Catalytic hydrolysis of COS in acid gas removal solvents Hydrolysis of COS in gas streams to H2 S and CO2 can be improved by the addition of certain bicyclo amine catalysts to acid gas removal solvents.... | 11/13/1984 |
| 4351812 | Hydrolysis of carbon oxysulfide with morpholines and piperazines The hydrolysis of carbon oxysulfide in a gas or liquid stream is catalyzed by morpholines and piperazines at a temperature in the range from about 50° about 90° C. The process can be used in the treatment of refinery gases, coal gasification streams, an... | 09/28/1982 |
| 4296078 | Separation of hydrogen chloride from gaseous mixtures A method is disclosed for separating hydrogen chloride from a gaseous mixture containing hydrogen chloride and carbon dioxide in admixture with other gaseous impurities comprising contacting said gaseous mixture with a cross-linked, water-soluble polymer ... | 10/20/1981 |
| 4292286 | Process for selective removal of cyclic urea from hindered amine gas treating solution A cyclic urea reaction product forms as a by-product of a hindered amine acid gas scrubbing process and results in an ultimate buildup of the material in the circulating amine scrubbing solution. The buildup of this material has a deleterious effect on ac... | 09/29/1981 |
| 4254094 | Process for producing hydrogen from synthesis gas containing COS Process for treating synthesis gas to recover a purified essentially sulfur-free hydrogen-rich stream. The novel sequence of operations employed comprises initially removing from the feed gas, such as from a synthesis gas derived from partial oxidation of... | 03/03/1981 |
| 4112049 | Absorption of sulfur compounds from gas streams Hydrogen sulfide and lower alkyl mercaptans are selectively extracted from a gas stream by contacting the stream with piperazinone or an alkyl substituted piperazinone which may contain a substantial proportion of water. The absorbed sulfur compounds can ... | 09/05/1978 |
| 4100256 | Hydrolysis of carbon oxysulfide The hydrolysis of carbon oxysulfide is catalyzed by piperazinone and alkyl-substituted piperazinones at ambient or below ambient temperatures. The hydrolysis step can be combined with a sour gas purification process in the treatment of refinery gases, coa... | 07/11/1978 |
| 4003848 | Method for the adsorption of sulfur dioxide Sulfur dioxide can be adsorbed from gas mixtures using cross-linked, water-insoluble polymers of N-glycidyl piperazine or N-glycidyl polyalkylpiperazines as the adsorbents.... | 01/18/1977 |
