Abstract: Disclosed is a method for deacidifying a fluid stream containing acidic gases as contaminants, according to which the fluid stream is brought into intimate contact with a washing liquid in at least one absorption step. Said washing liquid represents an aqueous solution containing a) tertiary aliphatic alkanolamines (alkanolamine A), at least 30 percent by weight of said tertiary aliphatic alkanolamines being 3-dimethylamino-1-propanol, and b) secondary aliphatic amines (activator B), at least 20 percent by weight of said secondary aliphatic amines being piperazin. The fluid stream which has been essentially purified of the acidic gases is then separated from the washing liquid that is loaded with acidic gases.

Abstract: An absorption medium for deacidifying fluid streams which has improved oxidation stability includes at least one aliphatic amine, and at least one non-hydroquinoid antioxidant. The absorption medium may be employed in deacidifying a fluid stream, in particular an oxygen-containing fluid stream, when the fluid stream is brought into intimate contact with the absorption medium in at least one absorption step.

Abstract: A process for the recovery of carbon dioxide, which includes: (a) an absorption step of bringing a carbon dioxide-containing gaseous feed stream into gas-liquid contact with an absorbing fluid, whereby at least a portion of the carbon dioxide present in the gaseous stream is absorbed into the absorbing fluid to produce (i) a refined gaseous stream having a reduced carbon dioxide content and (ii) an carbon dioxide-rich absorbing fluid; and (b) a regeneration step of treating the carbon dioxide-rich absorbing fluid at a pressure of greater than 3 bar (absolute pressure) so as to liberate carbon dioxide and regenerate a carbon dioxide-lean absorbing fluid which is recycled for use in the absorption step, in which the absorbing fluid is an aqueous amine solution containing a tertiary aliphatic alkanol amine and an effective amount of a carbon dioxide absorption promoter, the tertiary aliphatic alkanol amine showing little decomposition under specified conditions of temperature and pressure under co-existence with

Abstract: A description is given of a process for removing carbon dioxide from gas streams in which the partial pressure of the carbon dioxide is less than 200 mbar, in particular flue gases, the gas stream being contacted with a liquid absorption medium which comprises an aqueous solution (A) of a tertiary aliphatic alkanolamine and (B) an activator of the formula R1—NH—R2—NH2, where R1 is C1-C6-alkyl and R2 is C2-C6-alkylene, the sum of the concentrations of A and B being 2.5 to 7 mol/l, and the molar ratio of B to A being in the range of 1:3 to 1.5:1. The activator is, for example, 3-methylaminopropylamine, the tertiary aliphatic amine methyldiethanolamine, methyidiisopropanolamine or n-butyldiethanolamine. The process permits substantial removal of carbon dioxide and the regeneration of the absorption medium is possible with relatively low energy consumption.

Abstract: A description is given of an absorption medium for removing carbon dioxide from a gas stream, which comprises an aqueous solution of at least one amine and at least one aminocarboxylic acid and/or aminosulfonic acid. The concomitant use of an aminocarboxylic acid or aminosulfonic acid reduces the energy required for regeneration of the absorption medium.

Abstract: A method for bringing into contact two phases which are not completely miscible with one another, and whose contact is accompanied by heat development owing to mass transfer and/or chemical reaction, in which a first phase is introduced into the lower region of a contactor and a second phase is introduced into the upper region of the contactor and passed in countercurrent flow to the first phase in the contactor, a treated first phase and an exhausted second phase being obtained, which comprises recirculating a part of the exhausted second phase to the contactor at least one point situated between the upper region and the lower region. In the preferred embodiment, the first phase is a fluid stream comprising acid gases such as CO2, H2S, SO2, CS2, HCN, COS or mercaptans, and the second phase is an absorption medium which comprises an aqueous solution of at least one organic and/or inorganic base.

Abstract: A method is provided for removing acid gases and ammonia from a fluid stream in which a fluid stream comprising acid gases and ammonia is brought into contact with an aqueous absorption medium. The fluid stream is depleted of acid gases and ammonia and the absorption medium stream, which is charged with acid gases and ammonia, is regenerated in a desorption step. The acid gases and the ammonia are stripped out of the absorption medium and the condensable fractions thereof are condensed. A condensate and also a purified absorption medium stream are obtained. The condensate is ejected in part or completely from the desorption step, or feed in part or completely to a distillation column in which ammonia is separated off overhead as an aqueous solution or in the pure state. A aqueous bottom stream is obtained which is recycled to the absorption step or the desorption step.

Abstract: A method for obtaining an acid gas stream having a pressure of from 3 to 30 bar by removal of acid gases from a fluid stream containing H2S, the molar fraction of H2S based on the total amount of acid gases being at least 50 mol %, the method comprising bringing the fluid stream into intimate contact with a liquid absorption medium, thus producing a fluid stream substantially freed from acid gases and an acid-gas-loaded liquid absorption medium; separating the fluid stream and the liquid absorption medium; separating, by heating and optionally by expansion or stripping, the liquid absorption medium into an acid gas stream and a regenerated liquid absorption medium; passing the regenerated liquid absorption medium into a heat exchanger and cooling it there by using part of its thermal energy to heat up the acid-gas-loaded liquid absorption medium; and recirculating the regenerated liquid absorption medium.

Abstract: A description is given of an absorption medium for removing carbon dioxide from gas streams which comprises aqueous solution of an amine of the formula I HNR2 ??(I) where one or both radicals are and the other radical R is hydrogen. The absorption medium is distinguished by particular oxidation resistance.

Abstract: The disclosure relates to an absorbent for removing acid gases from fluids. The absorbent contains at least one tertiary amine, an amine which is selected from hydroxyethylpiperazine, bis(hydroxyethylpiperazine) or a mixture of these and piperazine. The absorbent may optionally contain a physical solvent for the acid gases.

Abstract: The invention relates to a method for the removal of carbon dioxide from a gas flow, in which the partial pressure of the carbon dioxide in the gas flow is less than 200 mbar, whereby the gas flow is brought into contact with a liquid absorption agent, comprising an aqueous solution (A) of a tertiary aliphatic amine and (B) an activator of general formula R1-NH-R2-NH2, where R1=C1-C6 alkyl and R2=C2-C6 alkylene. The method is particularly suitable for treatment of flue gases and also relates to an absorption agent.

Abstract: The invention relates to a method for the removal of carbon dioxide from a gas flow with a carbon dioxide partial pressure in the gas flow of less than 200 mbar, whereby the gas flow is brought into contact with a liquid absorption agent, selected from an aqueous solution (A) of an amino compound with at least two tertiary amino groups in the molecule and (B) an activator, selected from the primary and secondary amines, or (A) a tertiary aliphatic amine, the reaction enthalpy ?RH for the protonation of which is greater than that for methyldiethanolamine and (B) an activator, selected from 3-methylaminopropylamine, piperazine, 2-methylpiperazine, N-methylpiperazine, homopiperazine, piperidine and morpholine. The method is particularly suitable for the treatment of flue gases and also relates to an absorption agent.

Abstract: A method for obtaining an acid gas stream having a pressure of from 3 to 30 bar by removal of the acid gases from a liquid stream comprising as impurities H2S and if appropriate other acid gases, the molar fraction of H2S, based on the total amount of acid gases, being at least 50 mol %, which comprises a) in at least one absorption step, bringing the fluid stream into intimate contact with a liquid absorption medium and thus producing a fluid stream substantially freed from acid gases and an acid-gas-loaded liquid absorption medium (step a), b) separating from one another the fluid stream substantially freed from acid gases and the acid-gas-loaded liquid absorption medium (step b), c) separating, by heating and if appropriate expansion or stripping, the acid-gas-loaded liquid absorption medium into an acid gas stream having a pressure of from 3 to 30 bar and a regenerated liquid absorption medium (step c) d) passing the regenerated liquid absorption medium into a heat exchanger and cooling it there, by using

Abstract: A method is proposed for removing acid gases and ammonia from a fluid stream, according to which 1. in an absorption step the fluid stream comprising the acid gases and ammonia is brought into contact with an aqueous absorption medium, obtaining a fluid stream which is depleted of acid gases and ammonia, and also an absorption medium stream which is charged with acid gases and ammonia and 2. is regenerated in a desorption step, the acid gases and the ammonia being stripped out of the absorption medium and the condensable fractions thereof condensed, obtaining a condensate and also a purified absorption medium stream, which comprises ejecting in part or completely the condensate from the desorption step, or feeding it in part or completely to a distillation column in which ammonia is separated off overhead as aqueous solution or in the pure state and an aqueous bottom stream is obtained which is recycled to the absorption step or the desorption step.

Abstract: Disclosed is a method for deacidifying a fluid stream containing acidic gases as contaminants, according to which the fluid stream is brought into intimate contact with a washing liquid in at least one absorption step. Said washing liquid represents an aqueous solution containing a) tertiary aliphatic alkanolamines (alkanolamine A), at least 30 percent by weight of said tertiary aliphatic alkanolamines being 3-dimethylamino-1-propanol, and b) secondary aliphatic amines (activator B), at least 20 percent by weight of said secondary aliphatic amines being piperazin. The fluid stream which has been essentially purified of the acidic gases is then separated from the washing liquid that is loaded with acidic gases.

Abstract: A process for deacidifying a fluid stream containing acid gases as impurities, which comprises, in at least one absorption step at a pressure of from 0.5 to 20 bar, bringing the fluid stream into intimate contact with an absorbent with the proviso that the absorption step, and in the case of a plurality of absorption steps at least one of the absorption steps, is carried out in an inert scrubbing column, the internal surface of which essentially consists of plastic or rubber.

Abstract: Absorbent for removing acid gases from fluids, comprising a) at least one tertiary alkanolamine and b) an amine which is selected from hydroxyethylpiperazine, bis(hydroxyethylpiperazine) or a mixture thereof.

Abstract: A process is described for removing acid gases from a gas stream in which an acid-gas-containing gas stream in which the sum of the partial pressures of the acid gases does not exceed 1,500 mbar is brought into contact with an aqueous absorbent in an absorption step and an absorbent is used which contains methyldiethanolamine and piperazine at a concentration of at least 8% by weight of the absorbent, an acid-gas-depleted gas stream and an acid-gas-loaded absorbent being obtained.

Abstract: Method of simulating mass and heat transfer-controlled separation processes using a core-film approach to describe a transfer taking place at a phase boundary (P) in which, for iteratively solving a suitable implicit differential equation system, discretisation of a transitional area (10) of the core-film approach under consideration is carried out, thereby resulting in a differential equation system.

Abstract: A description is given of an absorption medium for deacidifying fluid streams which has improved oxidation stability and comprises at least one aliphatic amine, in particular an alkanolamine, and at least one non-hydroquinoid antioxidant. The absorption medium serves for deacidifying a fluid stream, in particular an oxygen-containing fluid stream, the fluid stream being brought into intimate contact with the absorption medium in at least one absorption step.