Showing papers on "Sour gas published in 1983"

Demetallizing and decarbonizing heavy residual oil feeds

Abstract: The method and means for effecting selective visbreaking of residual oil feeds (3, 7, 8) comprising metallo-organic compounds with a fluid solid sorbent particle material in the presence of process sour water (1,2,4) and wet gas recycle material (9) is described to provide a gas oil rich product more suitable for crystalline zeolite fluid catalytic cracking operations.

Removal of hydrogen sulfide from fluid streams with minimum production of solids

Abstract: Fluid streams containing hydrogen sulfide from a steam turbine or from a sour gas stream are contacted with an aqueous solution of a polyvalent metal chelate and an oxidizing agent whereby the hydrogen sulfide is converted to free sulfur and then to soluble sulfur compounds. The metal chelate is reduced to a lower oxidation state metal chelate and reduced metal chelate is subsequently oxidized with air back to the higher oxidation state and reused.

Membrane separation processes for acid gases

Abstract: This work provides a review of the emerging technology of using membranes to separate acid gases such as CO2, H2S, and SO2 from gas streams. The use of membranes for gas separations is an active area in both fundamental studies and commercial development. Numerous applications exist for the separation of the acid gases CO2, H2S, and/or SO2 from various natural gas or refinery gases. The choice of technology and the economics become complex because analysis of each application must address the following factors: acid gases to be removed, inlet compositions and pressure, acceptable outlet concentrations, temperature of inlet gas, and scale and location of application. In addition to these process parameters, the relevant membrane properties are the permeability, selectivity, and expected lifetime under operating conditions. 33 references.

H2S Removal process

Abstract: A cyclic process for the removal of hydrogen sulfide, and carbon dioxide, from a variety of gas streams is disclosed. The gas stream containing the sour gas(es) is contacted with an aqueous solution of a specific reactant ligands or chelate, or mixtures thereof, optionally in an absorbent, containing specific stabilizers for improvement of chelate life. The hydrogen sulfide is converted to sulfur, CO2 may be absorbed to produce a purified gas stream, and the reactant chelate is reduced. The process includes sulfur removal and regeneration of the reactant chelate.

Controlling sulfur deposition in sour gas wells

Abstract: This study relates the present theory on sulfur deposition to likely scenarios for very sour gas well behavior during production, including: what can be expected as a result of deposition, methods to avoid or mitigate deposition, procedures that should be avoided, and locations and conditions in which deposition can be expected. A technique is presented by which reservoirs containing high percentages of H/sub 2/S may be produced without causing the formation of sulfur plugs in the well or formation. The key to its success is in selecting a production rate that balances the effects of pressure drawdown and temperature changes with fluid flow velocity.

Non-precipitating regulation of ammonia content in sour gas solvent scrubbing systems

Abstract: "NON-PRECIPITATING REGULATION OF AMMONIA CONTENT IN SOUR GAS SOLVENT SCRUBBING SYSTEMS" Abstract The NH3 content is regulated in methanol used in a process for scrubbing out sour gases from gaseous mixtures and/or for preventing ice formation prior to the scrubbing step. The methanol is freed, after the scrubbing step, respectively of absorbed gaseous components and/or water, and reused in the cycle as scrubbing liquid and/or for preventing ice formation. A strong acid is added to the methanol from water-soluble ammonium salts. Thereby, dissolved salts are formed which are removed together with water. Deleterious trace acids arc also removed by an analogous tratement with a basic compound. The acid/base treatments are conducted in succession.

Corrosion inhibitor for amine gas sweetening systems

Abstract: A corrosion inhibitor composition useful for preventing corrosion by solvents used in treating sour gas streams, comprising a quaternary pyridine salt, a surface-active agent and/or a thio compound and an effective amount of a water soluble nickel compound. The composition can also contain a demulsifier to prevent foaming of the resultant solution.

Catalyst and process for carbon monoxide conversion in sour gas

Abstract: A process is disclosed for the conversion of carbon monoxide in sour synthesis gas mixtures in the presence of a catalyst which is active in the presence of sulfur compounds. The catalyst comprises known sulfactive metal oxides or sulfides supported on a shaped carrier. The catalytically active oxides or sulfides are doubly promoted with an alkali metal compound and an oxide or sulfide of manganese. The two promoters combined in proper ratio provide a synergistic effect on the activity of the catalyst which is enhanced beyond that of the singly promoted catalyst. The catalysts are active at relatively low temperatures of less than 500° F., even in the presence of sulfur compounds. The equilibrium for the conversion of steam and carbon monoxide to hydrogen and CO2 is favored at lower temperatures.

Control of cyanides in FCC reactor by injection of ammonium polysulfide

Abstract: The concentration of cyanides in the sour water system of FCC reactor is controlled by injecting such an amount of ammonium polysulfide (APS) into the system that the weight ratio of net free sulfur to simple cyanides in the sour water is about 0.6 to about 3.8. The pH of the sour water is at least 8.0.

Method of removing H2 S from a gas stream utilizing boron-vanadium, quinone solution and iron scavaging composition

Abstract: A process for removing hydrogen sulfide from sour gas streams is disclosed which is carried out in processing equipment which includes steel components resulting in iron from the steel slowly dissolving in the alkaline H2 S absorption medium. The solubilized iron tends to react with the hydrogen sulfide to form iron sulfide which further oxidizes to produce sodium thiosulfate. The preferred absorption medium includes a metal vanadate and boron complex, a quinone type reoxidation catalyst and a metal ferri or ferrocyanide decahydrate compound capable of reacting with the solubilized iron in the alkaline absorption medium to form a precipitate which is unreactive with the dissolved hydrogen sulfide.

Nickel-chromium-molybdenum alloy

Abstract: A nickel-chromium-molybdenum alloy having high strength and resistance to corrosive environments such as are found in sour gas wells. Preferred alloys have good tolerance to the temperatures of the order of 300° C found in deep wells, are cold workable and have good ductility.

Method for the desulfurization of hydrocarbon gas

Abstract: A method for the desulfurization of sour natural gas containing sulfur contaminants wherein the natural gas is first heated to a temperature in the range of 250° C. to 450° C. and then contacted with a bed of sponge iron to remove at least a portion of the sulfur contaminants to form a sweet natural gas.

Process for producing sulphur from an NH3-containing and an NH3-free sour gas

Abstract: The process is characterised in that NH3-containing sour gas is combusted completely with air with the decomposition of NH3 to give nitrogen and water vapour, the NH3-free sour gas is divided into two part streams, the first part stream is combusted with air, with oxygen-enriched air or with oxygen, the second part stream, not combusted, is combined with the combustion gases and the NH3-free sour gas is divided into the part streams in a proportion such that the H2S/SO2 molar ratio in the combined gases is approximately 2:1. An NH3 content of less than 200 to 300 ppm in the process gas of the Claus plant is achieved. Furthermore, the proportion of the NH3-free and the NH3-containing sour gas to be processed can be highly flexible.

Applicability range for a high-strength duplex stainless steel in deep sour oil and gas wells

Abstract: Laboratory tests in simulated sour downhole environments performed on a duplex stainless steel show correlation with the field experience for these alloys.

Production of tubing in duplex steel VS 22 influence of cold working on mechanical properties behavior in corrosive sour gas and oil environment

Abstract: This presentation summarizes the development of duplex steel VS 22∗ in terms of manufacturing process, mechanical properties and corrosion behavior. Manufacturing of such tubings requires perfect control of steel making parameters. Hollow bars are obtained by the extrusion process. Final heat treatment is achieved in order to adjust ferrite-austenite balance. High mechanical properties can be obtained by cold working: cold drawing and cold pilgering are compared. In each case the influence of cold working on yield strength is examined. Corrosion behavior of VS 22 is tested in several corrosive environments: pitting corrosion potential in NaCl, resistance to chlorides stress corrosion cracking, corrosion rates, and resistance to SCC in CO2-H2S-NaCl mixture. Duplex tubing in VS 22 can be produced in annealed or cold work conditions. Manufacturing parameters are now well known and adapted to the exact well conditions. Typical application of such tubings concerns deep sour gas well with CO2 and chlorides and limited amounts of H2S.

Dew points and enthalpies of wet sweet and sour natural-gas mixtures

Abstract: This article presents the experimental dew points and enthalpies from 50 to 210/sup 0/C for six wet, natural gas mixtures: 1.85 mol% water/sweet gas, 5.0 mol% water/sweet gas, 10.0 mol% water/sweet gas, 0 mol% water/sour gas, 5.5 mol% water/sour gas, and 10.0 mol% water/sour gas. It was concluded that dew point pressures for wet, sour natural gases are higher than previously predicted. Enthalpies were given at 1250/sup 0/C, 150/sup 0/C, 175/sup 0/C, and 200/sup 0/C for wet, sweet natural gas mixtures and wet, sour natural gas mixtures. 8 figures, 5 tables. (DP)

Experience in Sour Gas Production From Depth of 6,000 m

Abstract: The increasing energy demand of the last decades and the increasing prices have led to new targets in drilling and production technique. The exploration of hydrocarbon reservoirs from shallow depths has shifted to deeper reservoirs. Sour gas has more and more replaced sweet gas and is now a very important part of gas production.

Sour-Water stripper efficiency. Actual operating data on sour-water strippers establish that the more volatile a component in a mixture, the lower the stage efficiency of that component

Abstract: The sour waters from the synthetic fuel industries will contain substantial percentages of carbon dioxide, phenolics, hydrogen cyanide, acetic, and other carboxylic acids. The use of multi-component-dependent stage efficiencies for sour-water stripper caluclations is discussed. It was established from actual operating data on sour-water strippers that the more volatile a component in a mixture, the lower the stage efficiency of that compound. (JMT)