Abstract: A method and device for the catalytic decomposition of laughing gas in a laughing-gas-bearing gas. The method includes diluting the laughing-gas-bearing gas with a diluting gas, while forming a laughing-gas-bearing charge gas. The laughing-gas bearing charge gas is passed through a heat-exchange step where heat exchange occurs with an exhaust. A heating step occurs for occasional heating of the laughing-gas-bearing charge gas in a fixed-bed reactor for catalytic decomposition of the laughing gas. In some embodiments the diluting gas is dried, and at least a part of the exhaust from the catalytic decomposition of the laughing gas is mixed with the laughing-gas-bearing charge gas upstream of the catalytic decomposition of the laughing gas.

Abstract: A device and method for the decomposition of laughing gas including a gas inlet for supplying a laughing-gas-bearing gas; a first heat-exchanger for the exchange of heat between an exhaust and the laughing-gas-bearing gas; a heating device for occasional heating of the laughing-gas-bearing gas and a fixed-bed reactor in which a catalyst is included in order to decompose the laughing gas. The device also includes a gas outlet, through which exhaust leaving the fixed-bed reactor can be taken away through the heat exchanger. The device may be used to implement a method where the catalyst for decomposition of laughing gas is maintained at temperatures below 800° C. and in which the fixed-bed reactor is arranged as an adiabatic reactor.

Abstract: The laughing-gas-containing gas (1) is diluted by means of a diluting gas (2). The diluting gas (2) is virtually free from water fractions in the dryer (3). After feed of the diluting gas (2) via the feed line (13), exhaust gas (8) from the catalytic decomposition (7) is added (4) to the laughing-gas-containing feed gas (12). After addition (4) of the exhaust gas (8) from the catalytic decomposition of laughing gas (7), the laughing-gas-containing feed gas (12) is compressed (5) and passed to the heat exchanger (6). In the heat exchanger (6) the laughing-gas-containing feed gas (12) is preheated by heat exchange with the exhaust gas (8). The exhaust gas (8) is cooled in the heat exchanger (6) in this process. The preheated laughing-gas-containing feed gas (12) is passed via a further optional heater (11) as a feed to the catalytic laughing gas decomposition (7). In order to avoid a concentration build-up, some of the exhaust gas (8) is passed out (9) of the process.

Abstract: The invention relates to an apparatus and to a process for decomposing dinitrogen monoxide. The apparatus comprises a gas inlet 1 for supplying a nitrogen monoxide-containing gas, a first heat exchange medium 3 for exchanging heat between an offgas and the nitrogen monoxide-containing gas, a heating apparatus 4 for occasional heating of the nitrogen monoxide-containing gas, a fixed bed reactor 5 in which a catalyst is accommodated, in order to decompose the dinitrogen monoxide in the dinitrogen monoxide-containing gas, a gas outlet through which the offgas leaving the fixed bed reactor can be conducted out via the heat exchange medium 3. According to the invention, the catalyst is suitable for decomposing dinitrogen monoxide at temperatures below 800° C., especially preferably below 450° C., more preferably below 400° C. The fixed bed reactor 5 is configured for operation in an adiabatic state.

Abstract: For the catalytic removal of nitrogen oxides (2) from flue gases of combustion furnaces (1) which use hydrogen (H2) is used as reducing agent and the reaction is conducted at a temperature of below 150° C.

Abstract: A process is described for scrubbing of NO.sub.x and/or SO.sub.2 from waste gases as, e.g., flue gases, which employs a scrubbing agent comprising Fe(II) ions in nonaqueous solvents. The scrubbing agent can be regenerated after its loading simply by heating and/or reduction of pressure, after which the scrubbing agent can be reused. A slight reduction of the Fe(II) ion concentration occurring by oxidation can be balanced by simple means. The process makes it possible to scrub out NO or NO.sub.x alone or together with SO.sub.2. If SO.sub.2 alone is to be scrubbed out of a gas mixture, addition of Fe(II) salt can be eliminated.

Abstract: A process for scrubbing acid gases, especially carbon dioxide, from gas mixtures with an aqueous amine solution serving as the scrubbing liquid in which hexamethylene diamine serves as the amine. The concentration of the hexamethylene diamine in the aqueous solution is 5 to 40% by weight, preferably 25 to 35% by weight.