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.

A composition for absorbing carbon dioxide including an ionic liquid (A) containing a cation and an anion, and a protic compound (B) having a relative permittivity at 25 C. of 20 or more, wherein the cation at least includes a cation represented by the formula (1), the anion includes an anion where an acid dissociation constant (pKa) at 25 C. of its conjugate acid in water is 4.5 or more, and the ratio of a value obtained by multiplying the number of hydroxyl groups of the protic compound (B) by the number of moles of the protic compound (B) to the number of moles of the ionic liquid (A) [number of moles of protic compound (B)/number of moles of ionic liquid (A)] is 0.2 to 1.0:

##STR00001##

wherein R.sup.1 and R.sup.2 each independently represent a hydrogen or a C1-C6 linear alkyl group.

The invention relates to methods for regenerating a used sorbent having a gas adsorbate adsorbed thereto. In particular, the used sorbent comprises liquid marbles. The liquid in the liquid marbles is comprised of a material or mixture of materials that selectively removes unwanted gaseous component in the gas to be purified.

A method is provided for inhibiting nitrosation of an aqueous amine solution used in a process of removing carbon dioxide from a flue gas. That method includes a step of adding an effective amount of an antioxidant to the aqueous amine solution being circulated between an absorber and a stripper of a carbon dioxide capture system.

A method of oxygen scavenging, the method (i) providing an oxygen scavenger composition; and (ii) adding the oxygen scavenger composition to an aqueous feed and/or a hydrocarbon feed of a hydrocarbon processing system.

Disclosed is an aqueous solution for absorbing and recovering carbon dioxide from a carbon dioxide-containing gas, the aqueous solution containing an amino alcohol compound represented by Formula 1 and an amine compound represented by Formula 2, ##STR00001## wherein R represents an alkyl group having 1 to 5 carbon atoms; and n represents 1 or 2, ##STR00002## wherein X represents NR1R2; Y represents NR3R4; R1, R2, R3 and R4 may be the same or different, and each represents an alkyl group having 1 to 3 carbon atoms; and m represents an integer of 3 to 7.

The invention relates to methods for regenerating a used sorbent having a gas adsorbate adsorbed thereto. In particular, the used sorbent comprises liquid marbles. The liquid in the liquid marbles is comprised of a material or mixture of materials that selectively removes unwanted gaseous component in the gas to be purified.

A degradation inhibitor composition for stabilizing an amine solvent used in a post-combustion carbon capture process is provided. According to a preferred embodiment, the degradation inhibitor comprises: (a) Nitrilotriacetic acid (NTA); or (b) N-(2-hydroxyethyl) ethylenediamine-N, N, N-triacetic acid (HEEDATA). A method of stabilizing an amine solvent used in a post-combustion carbon capture process using the degradation inhibitor compositions described herein is also provided.

An oxidation resistant absorbent for capturing carbon dioxide from a gas stream. The oxidation resistant absorbent includes an alkanolamine with a weight percent in a range of 10 wt. % to 35 wt. % to a total amount of the oxidation resistant absorbent, a base with a weight percent in a range of 1 wt. % to 15 wt. % to a total amount of the oxidation resistant absorbent, a plurality of nanoparticles with a weight percent in a range of 0.1 wt. % to 3 wt. % to a total amount of the oxidation resistant absorbent, and water.

A composition for absorbing carbon dioxide including an ionic liquid (A) containing a cation and an anion, and a protic compound (B) having a relative permittivity at 25 C. of 20 or more, wherein the cation at least includes a cation represented by the formula (1), the anion includes an anion where an acid dissociation constant (pKa) at 25 C. of its conjugate acid in water is 4.5 or more, and the ratio of a value obtained by multiplying the number of hydroxyl groups of the protic compound (B) by the number of moles of the protic compound (B) to the number of moles of the ionic liquid (A) [number of moles of protic compound (B)/number of moles of ionic liquid (A)] is 0.2 to 1.0: ##STR00001##
wherein R.sup.1 and R.sup.2 each independently represent a hydrogen or a C1-C6 linear alkyl group.