Methods and apparatus relate to recovery of carbon dioxide and/or hydrogen sulfide from a gas mixture. Separating of the carbon dioxide, for example, from the gas mixture utilizes a liquid sorbent for the carbon dioxide. The liquid sorbent contacts the gas mixture along asymmetric hollow-fiber membranes that enable transfer of the carbon dioxide from the gas mixture to the liquid sorbent.

Hollow-fiber membrane contactors

A process and an apparatus are disclosed for recovering ethane, ethylene, and heavier hydrocarbon components from a hydrocarbon gas stream. The stream is cooled, expanded to lower pressure, and supplied to a first fractionation tower at a mid-column feed position. A distillation liquid stream is withdrawn from the first fractionation tower below the feed position of the expanded stream, heated, and directed into a second fractionation tower that produces an overhead vapor stream and a bottom liquid stream. The overhead vapor stream is cooled to condense it, with a portion of the condensed stream directed to the second fractionation tower as its top feed and the remainder directed to the first fractionation tower at a lower column feed position. The bottom liquid stream from the second fractionation tower is cooled and directed to the first fractionation tower as its top feed.

Hydrocarbon gas processing

An intermediate substrate includes a handle substrate bonded to a thin layer suitable for epitaxial growth of a compound semiconductor layer, such as a III-nitride semiconductor layer. The handle substrate may be a metal or metal alloy substrate, such as a molybdenum or molybdenum alloy substrate, while the thin layer may be a sapphire layer. A method of making the intermediate substrate includes forming a weak interface in the source substrate, bonding the source substrate to the handle substrate, and exfoliating the thin layer from the source substrate such that the thin layer remains bonded to the handle substrate.

Bonded intermediate substrate and method of making same

A method for inhibiting the plugging of a conduit by gas hydrates comprises adding to a mixture of water and hydrocarbons flowing through the conduit an amount of a hydrate formation inhibitor component of formula (a), wherein two of R1-R4 are independently normal or branched alkyls having 4 or 5 carbon atoms, two of R1-R4 are independently representing organic moieties having at least 8 carbon atoms, A represents a nitrogen or phosphorus atom, and Y represents an anion.

Method for inhibiting the plugging of conduits by gas hydrates

A multi-junction solar cell includes a silicon solar subcell, a GaInP solar subcell, and a GaAs solar subcell located between the silicon solar subcell and the GaInP solar subcell. The GaAs solar subcell is bonded to the silicon solar subcell such that a bonded interface exists between these subcells.

GaInP/GaAs/Si TRIPLE JUNCTION SOLAR CELL ENABLED BY WAFER BONDING AND LAYER TRANSFER

A process and a device for the catalytic dehydrogenation of a C 2+ paraffinic hydrocarbon charge is applicable to the synthesis of methyl tert-butyl ether. Effluent coming from the dehydrogenation reactor and containing olefins and water is cooled in at least one heat exchanger (41), saturated with water in a column (3) and sent to a stripping column (10) where it is at least partly put in contact with a recycled aqueous liquid phase containing a solvent, preferably methanol. The compressed gaseous effluent in which the water is thereby inhibited from freezing by the methanol is cooled in a heat exchanger (13) then separated in separator (8) into olefins and into hydrogen. An aqueous liquid phase with methanol is decanted at (8) and recycled in column (10).

Process and device for catalytic dehydrogenation of a C2+ paraffinic charge comprising means for inhibiting the freezing of water in the effluent

For producing three effluents which are respectively rich in straight chain paraffins, in mono-branched paraffins, and in di-branched and tri-branched paraffins possibly with naphthenic and/or aromatic compounds, from C5-C8 cuts or intermediate cuts (C5-C7, C6-C8, C7-C8, C6-C7, C7 or C8), comprising paraffic and possibly naphthenic, aromatic and olefinic hydrocarbons, the separation process of the invention uses at least two separation units operating either by adsorption or by permeation. It is of particular application when coupled with a hydro-isomerization process, which selectively recycles straight chain and mono-branched paraffins, necessary with paraffins containing more than 7 carbon atoms.

Process for separating a C5-C8 feed or an intermediate feed into three effluents, respectively rich in straight chain, non-branched and multi-branched paraffins

Procede de traitement d'un gaz contenant du methane, au moins un hydrocarbure superieur, de l'eau et au moins un gaz acide (CO₂ et/ou H₂S) dans le but d'en eliminer l'eau, le (ou les) gaz acides et d'extraire le (ou les) hydrocarbures superieurs. A process for treating a gas containing methane, at least one higher hydrocarbon, water and at least one acid gas (CO₂ and / or H₂S) in order to remove water, (or) acid gases and extract (or) higher hydrocarbons. Le procede comprend une etape de contact du gaz (1) avec une phase liquide recyclee de solvant (2) permettant d'eliminer l'eau (4) debarrassee de solvant, une etape de refroidissement (E1), une etape de rectification (G2), une etape de separation des hydrocarbures liquides (6), une etape d'absorption des gaz acides dans le solvant (G3) et une etape de regeneration dudit solvant (D1). The method comprises a gas contacting step (1) with a recycled liquid phase of solvent (2) for eliminating the water (4) freed of solvent, a cooling step (E1), a stripping step (G2 ), a step of separating the liquid hydrocarbons (6), a step of absorption of acid gas in the solvent (G3) and a step of regenerating said solvent (D1). Application au gaz naturel et au gaz de raffinerie. Application natural gas and refinery gas.

Process of dehydration, of deacification and of separation of a condensate from a natural gas

The process comprises a cold absorption step 2 for removing acid gas from natural gas using a solvent phase at a pressure P2 which delivers a purified gas 5; a step for depressurizing and separating resultant acidic solvent phase containing hydrocarbons (lines 4, 11), at a pressure P12 which is lower than pressure P2 in a column-heat exchanger 12 which delivers a purified gaseous effluent 13 overhead and a further solvent phase at the bottom (line 17) which is enriched in hydrogen sulphide; and a solvent phase regeneration step carried out in a distillation column 18 at a pressure P18 and no higher than pressure P12. A gas 29 containing essentially hydrogen sulphide which is depleted in hydrocarbons is recovered from column 18 and is a suitable feed for a Claus plant for eliminating H2 S. The regenerated hot solvent phase 20 indirectly exchanges heat with the cold acidic solvent phase from absorber 2 or separator 6. It is then recycled to the absorbent after cooling.

Process and apparatus for eliminating at least one acid gas by means of a solvent for the purification of natural gas

Described are a process and an apparatus for transporting and treating a natural gas. The process according to the invention comprises contacting in a zone G 1 the gas issuing from a production well (1) with a liquid phase coming at least in part from recycling (4) and containing water and at least one anti-corrosion additive and/or at least one anti-hydrate additive which is at least partly water-miscible and vaporizing in the pure state or in azeotrope form; transporting the additive-charge gaseous phase in a conduit (5), cooling it at E 1 , separating at B 1 an aqueous phase from the non-condensed gas which is collected by way of a conduit (10) and recycling the additive-charged aqueous phase to the contact zone G 1 by way of the line (9, 4). The process and apparatus are for the transportation of natural gas over long distances in particular.

Joseph Larue

Papers

Process and device for catalytic dehydrogenation of a C2+ paraffinic charge comprising means for inhibiting the freezing of water in the effluent

Process for separating a C5-C8 feed or an intermediate feed into three effluents, respectively rich in straight chain, non-branched and multi-branched paraffins

Process of dehydration, of deacification and of separation of a condensate from a natural gas

Process and apparatus for eliminating at least one acid gas by means of a solvent for the purification of natural gas

Process and apparatus for transporting and treating a natural gas