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| Number | Title | Issue Date |
| 4333744 | Two-feed pressure swing adsorption process One portion comprising about 30-80% of a hydrogen-containing feed gas having a relatively high carbon dioxide content is preheated to remove a substantial portion of said carbon dioxide therefrom. The thus - preheated stream is passed to a pressure swing ... | 06/08/1982 |
| 4332598 | Process for treating industrial gas stream This invention relates to a method for producing a hydrogen stream and a carbon dioxide stream from a mixed gas feedstock containing hydrogen, carbon dioxide, and contaminant sulfur compounds. The method comprises scrubbing the gas feedstock with a carbon... | 06/01/1982 |
| 4330522 | Acid gas separation Acid gases are separated from gaseous streams by the use of absorbents having the formula ##STR1## wherein R1, R2, and R3 are alkyl containing 1 through 4 carbon atoms.... | 05/18/1982 |
| 4330305 | Removal of CO2 and/or H2 S from gases Acid constituents, eg. H2 S and CO2 or their mixtures, are removed from industrial gases or natural gases by means of a washing agent which contains the methyl isopropyl ethers of polyethylene glycols. The washing can be carried out ... | 05/18/1982 |
| 4324567 | Separation of gaseous components from a gaseous mixture by physical scrubbing In a process for separating and obtaining as product gases at least two gaseous components from a gaseous mixture containing same by scrubbing with a physical scrubbing liquid exhibiting a higher dissolving power for at least one of the components to be s... | 04/13/1982 |
| 4322227 | Gas purification Natural gas having a high carbon dioxide content is contacted with sea water in an absorber at or near the bottom of the ocean to produce a purified natural gas.... | 03/30/1982 |
| 4319895 | Optimizing the quality of steam from geothermal fluids This invention relates to a method of optimizing the usable content of geothermal fluids to make use of steam in the largely aqueous and heated fluid. These fluids contain non-condensable gases, such as H2 S and CO2, as well as small... | 03/16/1982 |
| 4311856 | Process for synthesizing urea An inert gas containing carbon dioxide and ammonia and separated from a urea synthesis effluent under urea synthesis pressures is brought into contact with an absorbent along with unreacted carbon dioxide and ammonia separated in high pressure distillatio... | 01/19/1982 |
| 4305733 | Method of treating natural gas to obtain a methane rich fuel gas A method for the recovery of a methane-rich natural gas from a natural gas containing, apart from methane, also hydrogen sulfide, carbondioxide, higher hydrocarbons and, in most cases, organosulfur compounds. According to the invention a hydrocarbon fract... | 12/15/1981 |
| 4294590 | Removal of undesired gaseous components from hot waste gases For removing undesired gaseous components, e.g., SO2, from hot combustion gases (from carbonaceous fuels) by scrubbing with a regenerable absorbent, the scrubbing is conducted with a liquid physical absorbent, e.g., dimethylformamide, at a temp... | 10/13/1981 |
| 4279872 | Method of scrubbing acid gases from gas mixtures A process for scrubbing acid gases, especially carbon dioxide, from gas mixtures with an aqueous amine solution serving as the scrubbing liquid in which hexamethylene diamine serves as the amine. The concentration of the hexamethylene diamine in the aqueo... | 07/21/1981 |
| 4276057 | Process for treating pressurized gases to remove unwanted components Process for treating a gaseous mixture under pressure to remove unwanted components from a gas, including methane, ethane, hydrogen, nitrogen, such components as C3, C4 and C5 higher hydrocarbons, hydrogen sulphide and car... | 06/30/1981 |
| 4270937 | Gas separation process A process for separating acid gases such as CO2, H2 S, and SO2, other sulfur-containing molecules such as COS, and other relatively high boiling point impurities from lower boiling point components of a gas stream comprise... | 06/02/1981 |
| 4256471 | Process for the separation of ammonia and carbon dioxide from mixtures containing ammonia, carbon dioxide and water An improved process for the separate recovery of substantially pure ammonia and substantially pure carbon dioxide from mixtures containing ammonia and carbon dioxide, and possibly water, such as are obtained as by-products in the manufacture of melamine f... | 03/17/1981 |
| 4252548 | Carbon dioxide removal from methane-containing gases Methane-containing gases with an appreciable content of carbon dioxide are scrubbed with cold methanol to remove the bulk of the carbon dioxide in a simple system comprising a single gas-liquid contact column and featuring regeneration of the methanol con... | 02/24/1981 |
| 4251235 | Process for the separation of NH3 and CO2 from mixtures of NH.sub . 2 and water An improved process for the separate recovery of substantially pure ammonia and substantially pure carbon dioxide from mixtures containing ammonia and carbon dioxide, and possibly water, such as are obtained as by-products in the manufacture of melamine f... | 02/17/1981 |
| 4242108 | Hydrogen sulfide concentrator for acid gas removal systems A novel method is disclosed for treating a contaminated gas such as a contaminated natural gas or a synthesis product gas from the partial oxidation of petroleum or coal to concentrate and remove hydrogen sulfide at a reduced energy and capital requiremen... | 12/30/1980 |
| 4239510 | Natural gas purification A process and apparatus for removing an impurity from a gas by means of selective absorption of a gas impurity by a suitable absorbent. The absorbent and gas are contacted in a cocurrent flow contacter which is submerged in the absorbent. The flow of the ... | 12/16/1980 |
| 4238206 | Using solvents for acidic gas removal Disclosed is an improved process for removing carbon dioxide containing acidic gas from a normally gaseous mixture wherein the gaseous mixture is contacted with a liquid anhydrous solvent which physically absorbs said acidic gas but which is chemically un... | 12/09/1980 |
| 4235613 | Preparation of sales gas Method for preparing natural gas having a high carbon dioxide, ethane and propane content to meet sales gas specifications, such as BTU requirements. The gas is prepared by cooling, followed by contacting with at least one physical solvent which has a gre... | 11/25/1980 |
| 4235607 | Method and apparatus for the selective absorption of gases A process and apparatus for removing an impurity from a gas by means of selective absorption of a gas impurity by a suitable absorbent. The absorbent and gas are contacted in a contacting zone which is divided into a plurality of compartments with the abs... | 11/25/1980 |
| 4184855 | Process for CO2 removal A continuous process for acid gas removal from process gas streams by contact with an aqueous alkanolamine solution such as MEA wherein the temperature of the MEA solution is controlled by placing an intercooler at the lower end of the absorption column s... | 01/22/1980 |
| 4183369 | Method of transmitting hydrogen A method and apparatus for transmitting hydrogen gas from one point to another wherein the hydrogen gas is first purified to remove deleterious oxygen, carbon dioxide and any other contaminate. The gas may be compressed to raise that pressure to a presele... | 01/15/1980 |
| 4162903 | Physical solvent absorption of carbon dioxide and hydrogen sulphide for the deacidification of industrial gaseous mixtures The present invention is related to a process for absorbing acid gases from industrial gaseous mixtures by washing under pressure with a solvent. The invention is concerned more particularly with the use of hexamethyl phosphorotriamide OP[N(CH3... | 07/31/1979 |
| 4157958 | Inverted vessel processing method for the production of methane gas An apparatus for manufacture of combustible gas consisting principally of methane with minor amounts of carbon monoxide, carbon dioxide and hydrogen from organic wastes comprising an inverted vessel positioned in a body of water in a matter of such that t... | 06/12/1979 |
| 4155988 | Reduction of sulfur concentration in physical scrubbing agents In a low temperature gas scrubbing process with a physical scrubbing solution, e.g., methanol, wherein either the H2 S containing gas-to-be-scrubbed, e.g., coal gasification gas, has a sufficient concentration of SO SO2 and/or O... | 05/22/1979 |
| 4145192 | Method of processing technical gases A method of processing technical gases such as natural or synthetic gases containing water vapor, acidic and neutral sulfur compounds and/or higher hydrocarbons which comprises treating said gas with an anhydrous solvent containing N-methyl-&3xb5;-caprola... | 03/20/1979 |
| 4138230 | Dual pressure absorption process An absorption process, as for the removal of H2 S from vapor streams, wherein a stream of lean absorbent removed from the regenerator as a sidecut is used in a high pressure absorption zone and a lean absorbent stream removed as the regenerator... | 02/06/1979 |
| 4137294 | Process of scrubbing fuel synthesis gases to remove acid gases and organic sulfur compounds In scrubbing fuel gases or synthesis gas, absorption is improved by using simple oxygen containing water soluble organic compounds such as the lower alcohols, butanols, or water soluble lower ethers.... | 01/30/1979 |
| 4115081 | Process for separation of a mixed gas Separation of a mixed gas is carried out at ordinary temperatures by employing a silicone oil, or a certain high polymeric substance in liquid form or in solution as the solvent for absorbing the gas. Among others, methylphenyl silicone oil is preferably ... | 09/19/1978 |
| 4100257 | Process and amine-solvent absorbent for removing acidic gases from gaseous mixtures Acidic gases are substantially removed from a normally gaseous mixture by a process comprising contacting the normally gaseous mixture with an amine-solvent liquid absorbent comprising (i) an amine mixture comprised of at least about 50 mol % of a sterica... | 07/11/1978 |
| 4080424 | Process for acid gas removal from gaseous mixtures A hybrid physical-chemical absorbent process using the interrelation between a physical solvent and a H2 S selective chemical solvent for removal of CO2 and sulfur containing compounds, principally H2 S from a mixed gas st... | 03/21/1978 |
| 4070165 | Pretreatment of raw natural gas prior to liquefaction High pressure raw natural gas is prepared for liquefaction by first removing water and acid gases and then expanding the gas from the wellhead pressure to remove shaft horsepower. The expanded gas is scrubbed with a C4 rich liquid previously se... | 01/24/1978 |
| 4052176 | Production of purified synthesis gas H2 -rich gas, and by-product CO2 -rich gas A raw synthesis gas feed stream, e.g., gaseous mixtures comprising H2 and CO and containing gaseous impurities including CO2, H2 S, COS, and mixtures thereof (acid gas) and CH4, optionally in admixture with a CO... | 10/04/1977 |
| 4050909 | Process and apparatus for the production of hydrogen and carbon dioxide For the separation of substantially pure carbon dioxide and a gas enriched in hydrogen, said gases being especially suitable for the production of urea via an intermediate ammonia synthetic and reaction with CO4 a system is provided of A. scrub... | 09/27/1977 |
| 4048286 | Process for the decontamination of waste materials Combustible carbonaceous and sulfur-containing wastes, especially waste liquors of cellulose plants, are burnt with a combustion-sustaining gas having a greater oxygen concentration than atmospheric oxygen (e.g. pure oxygen) and the gaseous products of th... | 09/13/1977 |
| 4047894 | Removing carbon dioxide from the air An improved method and apparatus for removing carbon dioxide from the air in which the air is passed at a slightly elevated pressure over the surfaces of absorption elements impregnated with a carbon dioxide-absorbing liquid. The elements are corrugated p... | 09/13/1977 |
| 4035166 | Regeneration of regenerable aqueous scrubbing solutions used for removing acidic gases from gas mixtures This invention relates to a process for the regeneration of regenerable aqueous scrubbing solutions which are used for the bulk removal of acidic gases, by absorption from gas mixtures containing these acidic gases, in a cyclic process in which said aqueo... | 07/12/1977 |
| 3989811 | Process for recovering sulfur from fuel gases containing hydrogen sulfide, carbon dioxide, and carbonyl sulfide Sour gas streams containing significant quantities of H2 S, CO2, and COS are contacted with an aqueous absorbent to remove the acid gases, the acid gases are described and contacted with a selective absorbent which rejects a substant... | 11/02/1976 |
| 3976445 | Recarbonation process and apparatus Improvements in methods of and apparatus for recarbonation of lime-treated water with an oil fired submerged combustion burner; establishing a smaller reservoir adjacent a larger primary recarbonation reservoir with the oil fired burner in the former, pas... | 08/24/1976 |
