A plant includes a pretreatment unit for H2S removal and air dehydration, and at least two absorbers that receive a feed gas at a pressure of at least 300 psig with variable CO2 content (e.g., between 5 to 60 mol %), wherein the feed gas is scrubbed in the absorbers with an ultralean and a semi-lean physical solvent, respectively, at low temperatures to at least partially remove the CO2 from the feed gas. Such configurations produces a low CO2 dry treated gas and a H2S-free CO2 for sequestration while advantageously providing cooling by expansion of the rich solvent that cools the semi-lean solvent and the feed gas, wherein an ultralean solvent is produced by stripping using dry air.

There is provided herein a method for processing a gas comprising one or more impurity, the method comprising a) treating the gas with an impurity lean gas treating composition comprising i) a foam control agent comprising a polyalkylene glycol made by the polymerization of one or more alkylene oxide monomer initiated by a polyhydric compound having a functionality equal to or greater than 3 and ii) a gas treating agent and b) forming an impurity loaded gas treating composition. Preferably the gas is refinery gas or natural gas.

Disclosed is an improved process for regenerating solvent used to remove contaminants from a fluid stream. Said process comprises a solvent regeneration system (10) comprising a rich/lean solvent stripper column (29), reboiler (50), condenser (36), and reflux receiver (38) wherein the improvement is the location 46 of the condensed stripper gas return from the reflux receiver.

A solvent composition for carbon capture is provided. According to a preferred embodiment, the solvent used for carbon capture comprises: (a) a first component selected from the group consisting of: diethylaminoethanol; 1-(2-hydroxhyl) pyrrolidine; 3-diethylamino-1,2-propanediol; 3-diethylamino-1-propanol; 1-diethylamino-2-propanol and combinations thereof; and (b) a second component selected from the group consisting of: hexamethylenediamine (HMDA); 4-amino-1-butanol and combinations thereof. A method of performing carbon capture using the carbon capture solvent compositions described herein is also provided. An apparatus for performing carbon capture using the carbon capture compositions described herein and/or the carbon capture methods described herein is also provided.

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.

A system for processing a gas stream can include a physical solvent unit, an acid gas removal unit upstream or downstream of the physical solvent unit, and an LNG liquefaction unit downstream of the acid gas removal unit. The physical solvent unit is configured to receive a feed gas, remove at least a portion of any C.sub.5+ hydrocarbons in the feed gas stream using a physical solvent, and produce a cleaned gas stream comprising the feed gas stream with the portion of the C.sub.5+ hydrocarbons removed. The acid gas removal unit is configured to receive the cleaned gas stream, remove at least a portion of any acid gases present in the cleaned gas stream, and produce a treated gas stream. The LNG liquefaction unit is configured to receive the treated gas stream and liquefy at least a portion of the hydrocarbons in the treated gas stream.

A process for component separation in a polymer production system, comprising separating a polymerization product stream into a gas stream and a polymer stream, wherein the gas stream comprises ethane and unreacted ethylene, distilling the gas stream into a light hydrocarbon stream, wherein the light hydrocarbon stream comprises ethane and unreacted ethylene, contacting the light hydrocarbon stream with an absorption solvent system, wherein at least a portion of the unreacted ethylene from the light hydrocarbon stream is absorbed by the absorption solvent system, and recovering a waste gas stream from the absorption solvent system, wherein the waste gas stream comprises ethane, hydrogen, or combinations thereof.

A separation apparatus 10 includes a pretreatment section 20 that subjects a target fluid containing an olefin compound to at least one or more of a treatment for reducing an acetylene-based compound, a treatment for reducing a sulfur compound, and a treatment for reducing a fine particle component. In the pretreatment section 20, one or more treatments selected from a hydrotreating and an adsorption treatment with an adsorbent may be performed as the treatment for reducing the acetylene-based compound, one or more treatments selected from a washing and absorption treatment, an adsorption treatment with an adsorbent, and a hydrodesulfurization treatment may be performed as the treatment for reducing the sulfur compound, and one or more treatments selected from a liquid absorption treatment, a collection treatment, or a filtration treatment with a filter may be performed as the treatment for reducing the fine particle component.

Sour syngas treatment apparatuses and processes for treating a sour syngas stream are provided herein. In an embodiment, a process for treating a sour syngas stream that includes sulfur components and carbon dioxide includes absorbing the sulfur components and carbon dioxide from the sour syngas stream in a primary liquid/vapor phase absorption stage with a solvent to produce a liquid absorbent stream. The liquid absorbent stream includes the solvent, the sulfur components, and carbon dioxide. A portion of the sulfur components from the liquid absorbent stream is directly oxidized in the presence of a direct oxidation catalyst to produce elemental sulfur and a recycle stream. The recycle stream includes an unconverted portion of the sulfur components and carbon dioxide. The recycle stream is recycled for further absorption of the unconverted portion of the sulfur components and carbon dioxide through liquid/vapor phase absorption.

A process for component separation in a polymer production system, comprising separating a polymerization product stream into a gas stream and a polymer stream, wherein the gas stream comprises ethane and unreacted ethylene, distilling the gas stream into a light hydrocarbon stream, wherein the light hydrocarbon stream comprises ethane and unreacted ethylene, contacting the light hydrocarbon stream with an absorption solvent system, wherein at least a portion of the unreacted ethylene from the light hydrocarbon stream is absorbed by the absorption solvent system, and recovering a waste gas stream from the absorption solvent system, wherein the waste gas stream comprises ethane, hydrogen, or combinations thereof.