Systems and methods for removing hydrogen sulfide from an ammonia stream in the NH3 purification and liquefaction stage of a conventional two-column sour water stripping system using an adsorbent bed.

Systems and methods for removing hydrogen sulfide from an ammonia stream in the NH3 purification and liquefaction stage of a conventional two-column sour water stripping system using an adsorbent bed.

Systems and methods for separating CO.sub.2 and H.sub.2S from a natural gas stream are provided herein. The system includes a first loop of co-current contacting systems configured to remove H.sub.2S and CO.sub.2 from a natural gas stream and a second loop of co-current contacting systems configured to remove the H.sub.2S from the CO.sub.2.

Systems and methods for removing hydrogen sulfide from an ammonia stream in the NH3 purification and liquefaction stage of a conventional two-column sour water stripping system using an adsorbent bed.

In a process for separating at least one heavy impurity such as hydrogen sulfide from crude carbon dioxide comprising significant quantities of at least one light impurity such as non-condensable gases, involving at least one heat pump cycle using carbon dioxide-containing fluid from the process as the working fluid, the light impurity is removed from the crude carbon dioxide and carbon dioxide is subsequently recovered from the removed light impurity, thereby improving overall carbon dioxide recovery and efficiency in terms of energy consumption.

A method of sulfur enriching an acid gas stream in an acid gas enrichment system includes: (i) feeding an acid gas stream to a contactor, the acid gas stream comprising hydrogen sulfide (H2S), carbon dioxide (CO2), and hydrocarbons; (ii) separating the acid gas stream in the contactor to create a carbon dioxide rich stream and a purified acid gas stream; (iii) feeding the purified acid gas stream to a regenerator fluidly connected to the contactor; (iv) separating the purified acid gas stream in the regenerator to create a hydrogen sulfide rich stream and a hydrogen sulfide lean stream, the hydrogen sulfide rich stream having a concentration of hydrogen sulfide; and (v) periodically feeding at least a portion of the hydrogen sulfide rich stream exiting the regenerator to the acid gas stream entering the contactor.

A preparation method of a titanium-dioxide-based double-layer hollow material includes the following steps: (1) using polystyrene nanospheres with particle size of 180 nm as a template, tetrabutyl titanate as a precursor, to prepare hollow titanium dioxide by calcining; (2) subjecting said hollow titanium dioxide to carboxylation modification to prepare carboxylated titanium dioxide; and (3) dispersing said carboxylated titanium dioxide in ethanol, using chromic nitrate nonahydrate as an assembly agent and trimesic acid as a crosslinking agent to carry out layer-by-layer self-assembly so as to prepare the titanium-dioxide-based double-layer hollow material.

Techniques for treating a natural gas feed stream include receiving a natural gas feed stream that includes one or more acid gases, one or more hydrocarbon fluids, and one or more non-hydrocarbon fluids; circulating the natural gas feed stream to a membrane module; separating, with the membrane module, at least a portion of the one or more acid gases into a permeate stream and at least a portion of the one or more hydrocarbon fluids into a reject stream; circulating the permeate stream to a distillation unit; and separating, in the distillation unit, the one or more acid gases from the one or more non-hydrocarbon fluids.

Provided are a reclaimer 51 that introduces, through a branch line L.sub.11, and stores a part 17a of an absorbent 17 regenerated in a regenerator of a recovery unit that recovers CO.sub.2 or H.sub.2S in a gas, a first alkaline agent supply section 53A that supplies an alkaline agent 52 to the reclaimer 51, a heating section 54 that heats the absorbent 17 stored in the reclaimer 51 and to which the alkaline agent 52 has been mixed to obtain recovered vapor 61, a first vapor cooler 55A that cools the recovered vapor 61 discharged from the reclaimer 51 through a vapor line L.sub.12, a first gas-liquid separator 56A that separates a coexisting substance 62 entrained in the cooled recovered vapor 61 into a recovered absorption agent vapor (gas) 17b and the liquid coexisting substance 62 by gas-liquid separation, and an introduction line L.sub.13 that introduces the recovered absorption agent vapor 17b separated in the first gas-liquid separator 56A into a regenerator 20.

Disclosed are systems and methods which provide a process stream comprising a gaseous component, capture the gaseous component from the process stream by an ionic liquid solvent of a separator, and recover a captured gaseous component from the ionic liquid solvent in a regenerator. A second gaseous component from the process stream may be captured by the ionic liquid solvent of the separator, and the second gaseous component may be recovered from the ionic liquid solvent in the regenerator. Alternatively, the second gaseous component from the process stream may be uncaptured by the ionic liquid solvent, and the uncaptured second gaseous component may be recovered from a membrane unit.