A process for removal of mercury in a gas dehydration system comprising (a) adding a complexing agent to a recirculated glycol solvent as part of the glycol solution feed prior to or at the dehydration liquid contactor and recirculating continuously with the glycol solvent, (b) selectively reacting the complexing agent with mercury in the wet natural gas to remove the mercury from the dry natural gas product, (c) and feeding the rich glycol with the complexing agent to a regenerator and continuously regenerating.

Amine compositions comprising sterically hindered amines and associated methods are provided. In some embodiments, amine compositions of the present disclosure may be useful for selective removal of H.sub.2S from an acidic gas stream.

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.

Amine compositions comprising sterically hindered amines and associated methods are provided. In some embodiments, amine compositions of the present disclosure may be useful for selective removal of H.sub.2S from an acidic gas stream.

A method for removing acid gas from ethylene cracking gas. The method comprises: sequentially subjecting ethylene cracking gas containing acid gas to first-stage supergravity amine scrubbing, second-stage supergravity amine scrubbing, and washing with water, wherein a first-stage compound amine solution is used in the first-stage supergravity amine scrubbing, and a second-stage compound amine solution is used in the second-stage supergravity amine scrubbing. In the present invention, a supergravity technique is used to intensify the amine scrubbing process, and the compound amine solutions are used in cooperation, such that the removal depth of the acid gas is greatly increased, and hydrogen sulfide and carbon dioxide can respectively reach a level of 1 L/L without needing an alkali washing unit.

Amine compositions comprising sterically hindered amines and associated methods are provided. In some embodiments, amine compositions of the present disclosure may be useful for selective removal of H.sub.2S from an acidic gas stream.

According to an embodiment, an acid gas absorbent includes a solvent, and at least one or more amine compounds selected from the group consisting of amine compounds represented by chemical formula (1a).

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Wherein R.sup.1's are each independently hydrogen or an unsubstituted alkyl group having 3 or less carbon atoms, R.sup.2's are each independently an unsubstituted alkyl group having 3 or less carbon atoms, n is either 2 or 3.