Showing papers on "Gas separation published in 1981"

Flow control for oil, gas, water separation

Abstract: In separation of a stream of oil, gas and water into the constituents thereof in a horizontal heater-treater vessel having a gas separation chamber and an emulsion treating chamber, the stream is caused to flow downward into the gas separation chamber and through an outer secondary heating zone therein to permit gas to separate for upward flow and to cause heated components of the stream to turn to upward flow and thereafter to flow downward through an inner primary heating zone Common boundaries of the heating zone are defined by an inverted U-shape shroud in the gas separation chamber Water flows down to the bottom of the vessel from the stream in both the primary and secondary heating zone Gas flows upward from both the primary and secondary heating zones and an oil-water emulsion flows from the primary heating zone directly into the emulsion treating chamber

Preparation of composite film with selective permeability for gas

Abstract: PURPOSE:To obtain a composite film generating no cracks even if it is formed into an extremely thin film and excellent in gas separation capacity, by subjecting a thin film of a siloxane compound coated on a porous molecular film to plasma treatment by introducing a specific polymerizable gas CONSTITUTION:On a porous support comprising an ethylene tetrafluoride resin excellent in heat resistance and strength, silicon rubber dissolved in an org solvent is thinly coated and vulcanized and cured After film formation, a plasma polymerized thin film is laminated on the surface thereof to enhance gas separation property and selectivity Plasma treatment is carried out by using teitiary carbon or tertiary silicon as a polymerizable gas By this method, the film thickness of the plasma polymerized thin film can be manipulated by changing a glow discharge time in the atmosphere of 2 Torr or less and the obtained composite film has excellent characteristics in selective permeability for a mixed gas

Gas separation by physical absorption

Abstract: The invention provides a method of generating solvent used in the separation of gases from mixtures of gases at high pressure by selective physical absorption in which a jet pump is used to obtain subatmospheric pressure in the final stage of pressure reduction. In comparison with known methods, the invention offers reduced power requirements, simplicity of construction and increased reliability of operation.

Composite membrane for gas separation

Abstract: PURPOSE: To obtain a composite membrane excellent in gas permeability and separability, by coating a porous support base with a membrane-forming solution containing a polyquinazolone polymer and a swelling agent, irradiating the coated base with far-infrared rays and then contacting the base with water. CONSTITUTION: A porous support base is coated with a membrane-forming solution containing a polyquinazolone polymer having, as a recurring unit, a bisquinazolone unit represented by the formula, wherein R 1 is a tetravalent organic group, R 2 is an alkyl or an aromatic group, R 3 is a (p+2)-valent organic group, Z is -COOH, -SO 3 H, their metal salts and p is 0 or 1W4, and an additive for imparting an antistatic structure to a membrane to be produced. Then the surface of the coating layer consisting of the solution is irradiated with far-infrared rays to evaporate the solvent in the solution from only the superficial layer of the coating layer. Then the porous base is brought into contact with a coagulation solvent based on water. The above-mentioned additive is also called as a swelling agent and preferably an inorganic salt is used as the additive. COPYRIGHT: (C)1983,JPO&Japio

Oxygen separation membrane

Abstract: PURPOSE:To provide an oxygen separation membrane having excellent selective separation capacity for oxygen, by dispersing and containing a fine particulate magnetized substance in a membrane like resin molded object. CONSTITUTION:A resin material generally used as a gas separation membrane such as organosiloxane, a magnetic material such as an iron oxide fine powder and a terminal treating agent are added to and mixed in a solvent such as benzene to prepare a dispersion wherein the fine particles of the magnetic material are uniformly dispersed in a resin solution. This dispersion is cast into a membrane like body and, after the solvent is removed by evaporation, the membrane like body is placed in a magnetic field to magnetize the magnetic material and further dried to prepare an oxygen separation membrane. Thus obtained oxygen separation membrane shows excellent oxygen separation capacity compared to a separation membrane comprising only the resin used as the substrate thereof.

Novel copolymer and membrane prepared therefrom

Abstract: PURPOSE: A copolymer useful for gas separation membranes having a good selective permeability to a gas mixture and a mechanical strength enough to withstand continued use, prepared by copolymerizing an allyltrialkylsilane as a base with a diene. CONSTITUTION: A film-forming copolymer consisting of at least one kind of units (A) of formulaI, wherein R 1 , R 2 and R 3 are each 1W10C alkyl or (1W4C alkyl- substituted) phenyl (e.g., a corresponding monomer is allyltrimethylsilane) and repeating units (B) of formula II, wherein R 4 and R 5 are each H or methyl, and of formula III, wherein R 6 and R 7 are each H or methyl (e.g., a corresponding monomer is butadiene or dimethylbutadiene) wherein the ratio, (A)/(B), is 5/ 95W95/5. This copolymer can provide gas separation membranes having a mechanical strength enough to withstand continued use and having a good selective permeability to a gas mixture. COPYRIGHT: (C)1983,JPO&Japio

Preparation of composite separation film

Abstract: PURPOSE: To prepare a composite separation film having heat resistance and mechanical strength and excellent in gas permeation and gas separation capacities, by coating a dilute solution of an other heat resistant polymer is coated on an aromatic polyimide microporous film and the obtained coating film is dried. CONSTITUTION: On a microporous film prepared from aromatic polyamic acid or aromatic polyimide obtained by polymerizing an aromatic tetracarboxylic acid component and an aromatic diamine, a polymer solution obtained by dissolving a heat resistant polymer such as poly (2;6-diphenylphenylene oxide), polysulfone or silicone rubber (polydimethylsiloxane) in an aromatic polyimide insoluble solvent such as benzene is coated and the formed coating film is dried while gradually heated. By this method, a composite film having high separation capacity of H 2 from CO can be stably prepared in good reproducibility. COPYRIGHT: (C)1983,JPO&Japio

Gas separation film

Abstract: PURPOSE: To form a gas separation film with excellent chemical resistance, heat resistance and oil resistance of which both separation coefficient and a permeation coefficient and a permeation speed of oxygen and nitrogen are high by subjecting an organopolysiloxane and a fluorine containing polymer to graft copolymerization. CONSTITUTION: 15g fluorine containing polymer segment of which an average polymerization degree is 800 and a molar ratio of C 2 F 2 /C 3 H 6 /glycidyl vinyl ether is 54/44/2 and 5g amino group containing organopolysiloxane of which a polymerization degree is about 5,000 are dissolved in trifluorotrichloroethane and the resulting solution is stirred for about 2hr. After stirring, the temp. thereof is lowered to 47°C and, while the solvent is volatilized, the reaction is carried out for one hr and said reactants are further heated to 80°C to be reacted for 1.5hr under vacuum. When the obtained polymer is dissolved in ethyl acetate and the resulting solution is coated on a glass plate and dried in air or under vacuum, a film with a thickness of 9.4μ is obtained. The separation coefficient of this film (PO 2 /PN 2 ) is 3.29. COPYRIGHT: (C)1982,JPO&Japio

Gas separation membrane comprising polysulfone hollow fiber

Abstract: PURPOSE: To obtain a gas separation membrane having high separation coefficient and high permeation speed, by a method wherein a polysulfone hollow fiber is spun according to a wet process and the obtained hollow fiber is subjected to heat treatment at a temp. corresponding to M.W. of a non-solvent in a dope. CONSTITUTION: A polysulfone resin having repeating units of the formula is dissolved in an aprotic polar solvent such as N, N-dimethylformamide and a non- solvent such as a water-solbule alcohol is added to the resulting solution to prepare a uniform dope. The amount of the aprotic polar solvent is 30W60wt% and that of the non-solvent is 5W20%. From the dope, a hollow fiber is spun by using a hollow fiber spinning nozzle according to a wet process and coagulated in water to be wound up. In the next stage, the obtained fiber is subjected to heat treatment at a temp. range of from 120°C to the m.p. for 0.01secW60min according to the means of heat treatment, such as superheated steam, heated air, oil bath, contact with a hot plate or microwave irradiation. The obtained hollow fiber can be used in separating and concentrating a low-molecular gaseous compound and excellent in heat and chemical resistances. COPYRIGHT: (C)1983,JPO&Japio

Separation of gases

Abstract: The invention provides a method of operating a cascade gas separation process and a gas separation cascade (10) useful for uranium refining and employing a carrier gas. The method and cascade of the invention involve arranging relative gas flow rates between at least some modules (12) in the cascade so that the relative proportions of process gas leaving and entering each of said modules are such that there is a substantially constant molar flow rate of gas in each direction along the cascade through said modules. The proportion of carrier gas relative to process gas increased in opposite directions from the feed (14) to the opposite ends (20, 22) of the cascade and the modules through which the constant molar flow rate takes place have substantially the same size, capacity and construction.

Preparation extremely thin film

Abstract: PURPOSE:To obtain an extremely thin film having improved selective permeability to a mixed gas and a large film area easily, by dissolving polyolefin, etc. in a solvent consisting essentially of partially oxidized cyclohexene, casting the solution on a substrate on the surface of water. CONSTITUTION:(B) 0.1-10wt% Based on solution of polymer consisting essentially of polyolefin, e.g., polybutene, etc., or diene polymer (preferably 2-20C) having preferably high gas permeability, not softening at normal temperature, is dissolved in (A) a mixed solvent containing cyclohexene prepared by oxidizing cyclohexene partially. The prepared solution is then kept at preferably 20-70 deg.C, and cast on a substrate on the surface of water, to form an extremely thin film of the polymer. The temperature of the substrate on the surface of water is preferably 0-40 deg.C. When the film is used for gas separation, a substrate, e.g., Japanese paper, etc. is necessary.

Gas separation cascade

Abstract: PURPOSE:To enhance the flexibility of production, by increasing the control range of the concn. of a gas component to be separated. CONSTITUTION:Each of separation element groups A1-At is constituted by arranging a plurality of gas separation elements in parallel and the separation element main bodies of each separation element are connected in parallel to each other by a feed heater F, a product header P and a waste header W. The tail stage (lowermost stage) of a gas separation cascade is formed by dividing the separation element A1 into two to constitute first and second separation element groups A11, A12. The first and second separation element groups A11, A12 are ones wherein the separation element main bodies S of plural gas separation elements are respectively connected in parallel by feed headers F1, F2, product headers P1, P2 and waste headers W1, W2 and take independent step constitution.

Preparation of composite polyimide separation film

Abstract: PURPOSE: To prepare a film having stable gas separation performance in good reproducibility, by a method wherein an aromatic polyamic acid solution is applied on the surface of an aromatic polyimide porous film and the amide- acid bond of the coating is subjected to imide-cyclization by heating. CONSTITUTION: As an aromatic polyimide porous film, one not deteriorating gas permeability thereof even at high temp. of 200°C and high pressure of 100kg/ cm 2 is used and, on the surface of this film, a solution of aromatic polyamic acid in an org. polar solvent is applied at 140°C or below and the formed coating layer is heated to 150°C or above to subject the amide-acid bond in the polymer to imide-cyclization to form a cmposite polyimide film having a hamogeneous polyimide thin film layer formed on the surface thereof. The obtained composite film is used over a wide temp. range from room temp. to about 200°C because it is wholly constituted of aromatic polyimide as a heat-resistant material and has excellent gas permeating speed and gas separation performance. COPYRIGHT: (C)1982,JPO&Japio