Abstract: A method and composition for inhibiting the corrosion of metals in contact with an acid-gas absorbing medium comprising adding a product of the reaction of (1) copper or a copper salt, a copper oxide or a copper sulfide and (2) sulfur or a sulfide and an oxidizing agent and (3) a monoalkanolamine (monoethanolamine). The reaction is carried out at from 21.degree. to about 100.degree. C for a period of time to produce a stable non-precipitating product, i.e., reacted for from 0.1 to about 20 hours. The product is added to a gas treating plant absorbent in an amount of at least 0.00002 pounds of copper and 0.0002 pounds of sulfur per pound of medium per day.

Abstract: A process for separating acid gases from gaseous mixtures by absorption in alkaline solutions such as potassium carbonate solution wherin corrosion caused by the absorbing solution is reduced by inclusion therein of an aromatic compound. The aromatic compound has at least one nitro group and at least one hydroxyl group substituted in the same benzene nucleus. The invention is particularly applicable when the absorbent is a potassium carbonate solution activated by arsenic ions.

Abstract: A process is provided for removing hydrogen sulfide and alkyl mercaptans from fluid streams by reaction with oxygen in the presence of a metal amino acid chelate in aqueous solution containing an amine, converting hydrogen sulfide to sulfur and alkyl mercaptans to dialkyl disulfides, and separating these from the aqueous metal chelate solution.A process is also provided for removing hydrogen sulfide and alkyl mercaptans from fluid streams in which the gaseous or liquid stream is dispersed in aqueous metal chelate solution in a fine dispersion short of foam formation and passed through a reaction zone at a high flow velocity, where hydrogen sulfide is catalytically oxidized to sulfur, and alkyl mercaptans to dialkyl disulfides, and then into a relatively wide quiescent zone where the dispersion breaks, the gases are separated, and the metal chelate solution recovered.

Abstract: Circulating oil used for removal of sulfur in sour gas wells is contacted with an aqueous solution of an organic amine and allowed to separate into an oil phase and an aqueous amine phase containing the sulfur. The oil is then returned to circulation to the gas well and the aqueous amine phase is removed for regeneration which is accomplished by precipitating the sulfur with CO.sub.2 and stripping out the CO.sub.2 from the aqueous amine solution with heat and/or vacuum.

Abstract: Sour gas streams containing significant quantities of H.sub.2 S, CO.sub.2, 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 substantial quantity of the CO.sub.2, and the H.sub.2 S enriched absorbent is stripped to produce a feed suitable for Claus units.

Abstract: A process is described whereby accumulated impurities, consisting mainly of sodium tiocyanate are continuously removed from scrubbing liquors used for removal of hydrogen sulphide from fuel gases and the liquors thereby regenerated and re-used in the hydrogen sulphide scrubbing operation. The thiocyanate is removed by contacting the used scrubbing liquor with an organic solvent, e.g. n-butanol, separating the thiocyanate-bearing solvent from the scrubbing liquor, re-using the treated scrubbing liquor, recovering the thiocyanate from the solvent and re-using the solvent. The extracted sodium thiocyanate can be converted to pure, saleable chemicals or converted to an alkali which can be re-used in the absorbing liquors, thereby producing a completely closed system with no effluent.

Abstract: A process for regenerating absorbent solutions used for removing gaseous impurities such as CO.sub.2, H.sub.2 S,HCN, SO.sub.2 and other acidic gases from gaseous mixtures by stripping with steam, which comprisesA. dividing the solution to be regenerated into a principal and a secondary fraction (p and s) and regenerating these fractions separately from each other in a principal and a secondary regeneration column (P and S), the principal regeneration column being operated at a pressure of at least about 0.2 to 0.5 atm above the pressure of the secondary regeneration column,B. regenerating the principal fraction in the principal regeneration column by heat which is fed from outside into the lower part of the column,C. regenerating the secondary fraction in the secondary regeneration column by heat which has been removed from the regenerated solution leaving the principal regeneration column andD. passing the regenerated fractions to the absorber.

Abstract: A method and apparatus for removal of acidic gases from a gas stream by contacting the gas stream with an amine vapor in a reaction zone. The partial pressure of amine vapor in the reaction zone is at least 5 percent of the total pressure therein, resulting in removal of at least 99 percent of the acidic gases. When operating at ambient temperature and substantially atmospheric pressure, preferred amines are methylamine and dimethylamine.

Abstract: In a continuous process for the selective absorption of constituents from a gas stream where a component is reacted to form absorbable constituents, recovery per unit volume of absorbent is improved by passing the gas through a low temperature mass absorption zone, a high temperature reaction-absorption zone and a final low temperature absorption zone, the absorption solution from the final absorption and reaction-absorption zones being combined to form the absorption solution of the mass absorption zone.

Abstract: Corrosion of metallic surfaces by aqueous alkanolamine solutions employed in acid gas removal service can be inhibited by combinations of antimony and vanadium compounds, stannous salts, organo-tin compounds, nitro aromatic acids and their salts or benzotriazole.

Abstract: An improved process for purifying gas containing hydrogen sulphide and possibly other acid impurities, by means of amines, consisting of absorption of these impurities by contact between the gas for purification and an amine solution, particularly a mono- or di-ethanolamine solution, steam regeneration of the amine solution after it has fixed the acid compounds, and recycling of the regenerated solution to the absorption zone, characterized by the fact that the sulphur content of the regenerated amine solution is kept at an optimum level by varying the flow of regenerating steam.This improved process ensures better elimination of acid compounds, particularly hydrogen sulphide, by means of amines, and keeps the cost of purification as low as possible.

Abstract: Solid polyolefins of alpha monoolefins having 2 to 8 carbon atoms in the molecule such as, but not limited to, polyethylene and polypropylene containing a stearate radical such as calcium, zinc or magnesium stearate or stearic acid have added thereto an antifoaming amount of a barium compound which forms a water insoluble soap with the stearate radical in an alkaline solution.

Abstract: A catalytic amount of ammonia or ammonium compounds are utilized to prevent deterioration of alkanolamines employed in gas sweetening processes. The ammonia is added either to the sour gas or the absorbing solution and acts to suppress thiocyanate .[.formation.]. .Iadd.accumulation .Iaddend.during absorption.BACKGROUND OF THE INVENTION1. Field of the InventionThis invention relates to gas purification and more particularly to gas purification by the removal of acid gases from industrial gas in an absorption/desorption process.2. Prior ArtThe term "gas sweetening" pertains to gas purification processes in which acid gases, particularly sulfurous gases are removed from industrial gases.Gas sweetening processes commonly utilize aqueous absorbing solutions into which the acid gases are scrubbed (absorbed) to be later stripped (desorbed) for possible further treatment. Desorbing is accomplished by heating the spent solution to expel the acid gases.