Abstract: In a process for producing olefins, a hydrocarbon-containing feed is fed into a cracking furnace where relatively long-chain hydrocarbons of the hydrocarbon-containing feed are cracked at least partly to form shorter-chain olefins, encompassing ethylene and propylene. Cracking gas (1) formed during cracking is conveyed in succession through an upper section (11) and a lower section (12) of a scrubbing column (10) in countercurrent to a liquid scrubbing medium (43, 31), is proposed. A fraction (43) rich in petroleum spirit is used in the lower section (11) of the scrubbing column (10) and a water-rich fraction (31) is used in the upper section (11) of the scrubbing column (10) as scrubbing medium (43, 31). A plant configured for carrying out the process is likewise provided by the present invention.

Abstract: A plant for producing ethylene having a reactor to effect oxidative coupling of methane, a work-up unit connected to the reactor to separate a first material stream produced by the reactor into a C1? material stream and an ethylene product stream and a separation unit connected to the work-up unit to separate the C1? material stream into a hydrogen-rich product stream and a hydrogen-lean residual gas stream. The plant also includes a steam cracker to produce (5) for producing an olefin-containing and hydrogen-containing crude gas stream. The steam cracker is connected to the work-up unit that separates the crude gas stream along with the first material stream into the C1? material stream and the ethylene product stream. A portion of the residual gas stream is recycled to the reactor. A process for producing ethylene using the plant is also described.

Abstract: The invention describes a method for separating hydrocarbons in an installation for generating hydrocarbons from a hydrocarbon-containing charge by cleavage. The product gas of the cleavage, which contains gaseous hydrocarbons, is compressed, dried, and supplied as charge material into a separation stage (a front end C3/C4 separation). The front end C3/C4 separation comprises a C4 absorber and a depropanizer. A hydrocarbon fraction consisting of hydrocarbons having a maximum of 3 carbon atoms is obtained as a gaseous overhead product of the C4 absorber. A liquid hydrocarbon fraction consisting of hydrocarbons having at least 4 carbon atoms is obtained as a bottom product of the depropanizer. The front end C3/C4 separation comprises an additional process technological C2/C4 separation stage is arranged between the C4 absorber and the depropanizer.

Abstract: The invention relates to a method for processing coke oven gas, said coke oven gas containing hydrogen, wherein the coke oven gas is at least partially integrated into a method for producing dimethyl ether in conjunction with a gas containing carbon monoxide and/or carbon dioxide, whereby a DME-containing product gas is formed. At the outset of the method for the formation of dimethyl ether, a ratio of hydrogen to carbon monoxide, weighted with the carbon dioxide concentration (formula (I)), of 0.9 to 1.1 is set, wherein the DME-containing product gas is integrated into a method for converting dimethyl ether to olefins, whereby an olefin-containing product gas is formed, and wherein olefins, in particular ethylene and/or propylene, is/are separated from the olefin-containing product gas by means of separating methods.

Abstract: The invention relates to processes for production of dimethyl ether from methane or natural gas comprising: a dry-reforming step, wherein methane and carbon dioxide are converted into carbon monoxide and hydrogen, and a DME synthesis step, wherein the carbon monoxide and hydrogen formed in the dry-reforming step are converted into dimethyl ether, wherein the dry-reforming step and the synthesis step are carried out at identical pressures or at pressures, which do not differ more than 3 bar, preferably not more than 1 bar.

Abstract: A process for producing olefins, in which a hydrocarbon-containing feed is fed into a cracking furnace where relatively long-chain hydrocarbons of the hydrocarbon-containing feed are cracked at least partly to form shorter-chain olefins, encompassing ethylene and propylene. Cracking gas (1) formed during cracking is conveyed in succession through an upper section (11) and a lower section (12) of a scrubbing column (10) in countercurrent to a liquid scrubbing medium (43, 31), is proposed. A fraction (43) rich in petroleum spirit is used in the lower section (11) of the scrubbing column (10) and a water-rich fraction (31) is used in the upper section (11) of the scrubbing column (10) as scrubbing medium (43, 31). A plant configured for carrying out the process is likewise provided by the present invention.

Abstract: The invention relates to processes for production of dimethyl ether from methane or natural gas comprising: a dry-reforming step, wherein methane and carbon dioxide are converted into carbon monoxide and hydrogen, and a DME synthesis step, wherein the carbon monoxide and hydrogen formed in the dry-reforming step are converted into dimethyl ether, wherein the dry-reforming step and the synthesis step are carried out at identical pressures or at pressures, which do not differ more than 3 bar, preferably not more than 1 bar.

Abstract: The invention relates to a method for processing coke oven gas, said coke oven gas containing hydrogen, wherein the coke oven gas is at least partially integrated into a method for producing dimethyl ether in conjunction with a gas containing carbon monoxide and/or carbon dioxide, whereby a DME-containing product gas is formed. At the outset of the method for the formation of dimethyl ether, a ratio of hydrogen to carbon monoxide, weighted with the carbon dioxide concentration (formula (I)), of 0.9 to 1.1 is set, wherein the DME-containing product gas is integrated into a method for converting dimethyl ether to olefins, whereby an olefin-containing product gas is formed, and wherein olefins, in particular ethylene and/or propylene, is/are separated from the olefin-containing product gas by means of separating methods.

Abstract: The invention relates to a process for production of DME (17) comprising the steps of: generating a syngas (12) containing CO and H2 in a device (11) for syngas generation, passing the syngas (12) into a DME reactor (13) for direct synthesis of DME by catalysed conversion of the syngas (12) by means of a catalyst to form a product stream (14) containing DME, CO2, H2O, CH3OH and unconverted syngas (12). The invention provides that the direct synthesis is carried out at or close to the chemical equilibrium.

Abstract: The invention concerns processes for preparing dimethyl ether from synthesis gas, comprising a synthesis step, wherein synthesis gas comprising hydrogen and carbon monoxide is converted into dimethyl ether and carbon dioxide, and a separation step, wherein unconverted synthesis gas is separated from carbon dioxide, wherein unconverted synthesis gas is separated from carbon dioxide by a membrane.

Abstract: The invention relates to a method for processing furnace gas (4) from a steel and/or iron works, wherein said furnace gas (4) contains carbon dioxide and/or carbon monoxide and is at least partially integrated into a method (7) for the formation of dimethyl ether in conjunction with a hydrogen-containing gas (2), whereby a DME-containing product gas (8) is formed. At the outset of the method (7) for forming dimethyl ether, a ratio of hydrogen to carbon monoxide, weighted with the carbon dioxide concentration (formula (I)), of 0.9 to 1.1 is set and dimethyl ether is formed. The DME-containing product gas (8) is integrated into a method (9) for converting dimethyl ether to olefins, whereby an olefin-containing product gas (10) is formed, and wherein olefins (12), in particular ethylene and/or propylene, is/are separated from the olefin-containing product gas (10) by means of separating methods (11).

Abstract: The invention relates to a process for the treatment of a used waste alkali, in which the used waste alkali is oxidized at a superatmospheric pressure in the range from 60 bar to 200 bar. The pressure of the used waste alkali L is increased and then heated by indirect heat exchange. The heated used waste alkali is conveyed into a separator, wherein vaporized aqueous phase is separated from the used waste alkali. The resultant liquid phase is brought to the desired reaction pressure and introduced into an oxidation reactor. In the oxidation reactor, the used waste alkali is oxidized. In a first reaction, thiosulphates are formed from the sulphides. In a second reaction, the thiosulphates are converted into more stable sulphates.

Abstract: A method is described for process water treatment in olefin plants having at least one process steam generator (W1) and at least one cracking furnace (O) for steam cracking of hydrocarbons. It is proposed to pass the process water for process water stripping to the process steam generator (W1) and to feed the vaporized process water to the cracking furnace (O). The process steam generator (W1) can be connected downstream of a stripping column (T1), the process water, during cleaning of the stripping column (T1), being fed directly to the process steam generator (W1) for process water stripping, bypassing (B) the stripping column (T1).