Method for extracting a gas from a gas mixture by: during a purification step, bringing a first sorption medium into contact with the gas mixture in order to extract the gas from the gas mixture, whereby an enriched first sorption medium is formed in which the gas is at least partially sorbed; during a regeneration step, bringing a second sorption medium into contact with the enriched first sorption medium in order to extract the gas from the enriched liquid first sorption medium; whereby for the contact in the purification step and/or in the regeneration step use is made of a separate venturi ejector.

An absorbent mixture for the removal of acid gases from gas mixtures includes: A) at least one alcohol of general formula R(OH).sub.n, wherein R is an optionally substituted linear or branched alkyl or alkylaromatic group, with 2-20 carbon atoms and n is an integer that varies between 1-20; B) at least one organic base with a pK.sub.b (in water) less than or equal to 3; C) a solvent based on one or more heterocyclic compounds selected from cyclic ureas with a 5 or 6 atom ring of formula (IV) and/or (V); cyclic lactams with a 5 or 6 atom ring of formula (VI) and/or (VII); or combinations thereof:

##STR00001##

Where R1, R2, R3, R4 are independently selected from H, alkyl groups, linear or branched, with 1-10 carbon atoms;

##STR00002##

Where R1 and R3 are independently selected from H, alkyl, linear or branched groups with 1-10 carbon atoms.

The present invention relates to a dehydration composition and method of use thereof for drying gas streams, in particular natural gas streams, wherein the dehydration composition comprises (i) a glycol, (ii) a borate compound, (iii) an alkali metal carboxylate, and (iv) an additional glycol different than (i), and/or (v) an additional additive selected from an alkanolamine, a phosphate acid or salt compound, a sweetening agent, a low temperature viscosity improver, a corrosion inhibitor, an antifoaming agent, or mixtures thereof.

The present invention relates to an absorbent composition for absorbing the carbon dioxide contained in a gaseous effluent comprising the combination of a base B or of a mixture of bases B of carbonate, hydrogen carbonate or hydroxide type with at least one unsaturated heterocyclic organic compound R(NH).sub.n wherein the radical R is an alicyclic, monoaromatic or polyaromatic, or heterocyclic group having at least one nitrogen atom, and n is between 1 and 20, in an aqueous solvent Z and/or the product obtained by reaction of said base B or of said mixture of bases B with said compound R(NH).sub.n in said aqueous solvent Z. The invention also relates to a process to capturing the CO.sub.2 in a gaseous effluent using said composition.

The present invention relates to a dehydration composition and method of use thereof for drying gas streams, in particular natural gas streams, wherein the dehydration composition comprises a (a) glycol and (b) an additive selected so as to increase the viscosity, surface tension, and/or specific gravity of the dehydration composition. Said dehydration composition and method results in the reduction of solvent loss during the dehydration step in a gas dehydration unit.

A process for producing a material that absorbs carbon dioxide from atmospheric air, comprising: using a material that has a core and terminal primary amine end groups; and epoxy end capping of the terminal primary amine end groups to give secondary amine end groups.

Plants, processes, and methods for reducing the H.sub.2S and CO.sub.2 contents of shale gasses from fields that produce shale gasses having varying H.sub.2S and CO.sub.2 contents are provided. Acid gas enters an absorber and is scrubbed using a lean physical solvent, producing a treated gas and a rich physical solvent. The H.sub.2S content of the treated gas is further reduced in an amine absorber, producing a pipeline gas and a semi-lean amine. The pipeline gas contains lower levels of H.sub.2S and CO.sub.2 than gas produced using a polishing bed. A physical solvent regeneration unit regenerates the lean physical solvent from the rich physical solvent for feeding into the absorption unit. An amine regeneration unit regenerates the lean amine from the semi-lean amine for feeding into the amine absorber. Contemplated plants may further comprise a Claus Unit or a Redox unit for oxidizing H.sub.2S to elemental sulfur.

Disclosed herein are scavenging and antifouling compositions useful in applications relating to the production, transportation, storage, and separation of crude oil and natural gas. Also disclosed herein are methods of using the compositions as scavengers and antifoulants, particularly in applications relating to the production, transportation, storage, and separation of crude oil and natural gas.

Systems comprising a composition where an imidazole is tethered to an amine and a solvent are described herein. Methods of their preparation and use are also described herein. The methods of using the systems include the reduction of volatile compounds from gas streams and liquid stream.

A CO.sub.2 desorption system suitable for limited space in a complex sailing region comprises an exhaust boiler, a compact CO.sub.2 absorber, a compact CO.sub.2 lean-rich liquid heat exchanger, a compact CO.sub.2 desorber, a compact CO.sub.2 rich liquid preheating device, a compact CO.sub.2 rich liquid reboiling pre-desorption device and an intelligent control platform. Further, a global optimization control method for the CO.sub.2 desorption system suitable for limited space in a complex sailing region is further established based through a knowledge and data-driven exhaust extraction flow accurate-prediction model for a heat source of a CO.sub.2 rich liquid preheating device and a steam extraction flow accurate-prediction model for a heat source on an upper section of a CO.sub.2 rich liquid reboiling pre-desorption device to realize flexible control of operation parameters of the desorption system under different operating conditions of an engine.