Showing papers on "Gas separation published in 1978"

Separate feed entry to separator-contactor in gas separation

Abstract: In the separation of low boiling gases such as ethane or propane and heavier from a gas stream such as natural gas, a first portion of the feed is heat exchanged with an overhead from a downstream stripper column, such as a demethanizer, a second portion is heat exchanged with a stream from a lower portion of said stripper column, and these two portions passed as separate streams to a separator-contactor. The first stream is added at a point above the second. This results in an increase in the recovery of liquid products.

Maintaining the separation efficiency of immobilized liquid membranes in gas separation methods and apparatus

Abstract: Disclosed are an improved method and apparatus employing at least one immobilized liquid membrane separated from a liquid sweep by a gas-permeable barrier for removing a gaseous component from a gaseous mixture. The improvements include use of one or more liquid-filled passages extending through the gas-permeable barrier to effect diffusive transfer of active carrier species from the liquid sweep into the membrane, thereby maintaining the separation efficiency of each membrane. In a preferred embodiment, the improvements are applied to removal of hydrogen sulfide from mixtures thereof with carbon dioxide as found in gasified coal.

Gas Separation Performance of Tapered Cascade with Membrane

Abstract: Membrane gas separation cascades are analyzed at steady state. The methods of calculating the flow rate and concentration profiles in the cascade are examined, using formulas expressing the various membrane separation cell characteristics. The method adopted is applicable to relatively high concentrations and separation factors. Considerations are further given on the steady state performance of four theoretical forms of cascade : (a) with common value of cut for all stages, (b) with symmetric separation cells, (c) with no mixing at the junction at each stage, and (d) ideal cascade. The analysis showed that, with membrane cells, the ideal cascade would have a pressure ratio varying from stage to stage. The symmetric separation cascade would provide a separation performance lower than the ideal cascade on account of the mixing at the junctions of streams possessing different concentrations, whereas the cut and separation factor of the no-mixing cascade requiring minimum membrane area exhibits zig-zag curve...

Chelate-modified polymers for atmospheric gas chromatography

Abstract: New chromatographic materials have been developed to serve as the stationary phase of columns used in the separation of atmospheric gases. These materials consist of a crosslinked porous polymer matrix, e.g., a divinylbenzene polymer, into which has been embedded an inorganic complexed ion such as N,N'-ethylene-bis(acetylacetoniminato)-cobalt (II). Organic nitrogenous bases, such as pyridine, may be incorporated into the chelate polymer complexes to increase their chromatographic utility. With such materials, the process of gas chromatography is greatly simplified, especially in terms of time and quantity of material needed for a gas separation.

Composite hollow yarn and gas selective permeating method used above yarn

Abstract: PURPOSE: Membrane material for composite gas separation having superior gas selective permeating property and permeating quantity, carried a high molecular thin film on porous polyolefin hollow yarn superior in N 2 gas permeating velocity of hollow wall. CONSTITUTION: High molecular thin film is carried on porous PP or PE hollow yarn, having 50W5000μ of inner diameter, 5W200μ of wall thickness. less than 5μ of fine hole diameter of wall face and more than 100/m 2 .hr.0.5 atm. of N 2 gas permeating velocity of the wall and composite hollow yarn having gas selective permeating property, is obtained. On this ocassion, PE, PP, polybutadiene etc. or copolymer mainly composed of the above materials, are used for the material of high molecular thin film. Then, aimed composite hollow yarn is made by removing solvent after applying a suitable solvent solution of the high molecular materials on the porous hollow yarn or dipping the hollow yarn in the solvent solution. The above gas selective permeable membrane material is able to apply for the purpose of concentration and separation of H 2 , N 2 O 2 etc. or separation of gas in gas-liquid mixture etc. very effectively. COPYRIGHT: (C)1979,JPO&Japio

Adsorbent regeneration and gas separation utilizing dielectric heating

Abstract: Dielectric heating (microwave or radio frequency radiation) of saturated adsorbents to remove the adsorbed materials results in more rapid, efficient and safe regeneration than conventional heating. Separation of a gas mixture into two concentrated streams of its components is enabled by adsorption of one fraction by a selective adsorbent followed by removal of that fraction with dielectric heating and little or no purge gas. Useful by-products of the separation process are thereby economically recovered.

Membrane separation of gases

Abstract: of the gas separation membrane comprising as a main component a mixture of a polyvinyltriorganosilane and a polyorganosiloxane. This membrane comprises a dense layer having selective gas permeability and having a thickness of 0.01 to 10 mu, and a porous layer having open pores having a thickness greater than 10 mu.

Cleaning apparatus for exhaust gas of combustion

Abstract: PURPOSE:To remove effectively soot, SO2 and NO in the exhaust gas, by forming the corona discharge field between the discharge electrode and the gas separation electrode and by passing the exhaust gas of combustion through the flow passage for the exhaust gas constituted so as to be supplied with O3.

Production of cellulose acetate film used for gas separation

Abstract: PURPOSE:To produce film described in the title which is excellent in gas-separating and gas-permeating performance, by casting a mixed soln. of a high molecular cpd. e.g. cellulose triacetate etc., a solvent e.g. acetone etc., and a swelling agent e.g. formaldehyde etc. on a substrate, then after evaporation of the solvent, by subjecting the cast to water-treatment and heat-treatment.

Silica glass membrane for gas separation

Abstract: PURPOSE:To provide silica glass membrane for gas separation which has large gas permeation rate compared with org high mol membrane, and which is chemically stable, by heat-treatment of porous silica glass in a specific temp range

Defoaming in aerobic fermentation

Abstract: PURPOSE:To achieve effective foam breaking and gas separation in an aerobic fermentator, by the use of a gas sepator provided with a rotary defoamer at a specified position.