Abstract: A process for the continuous heterogeneously catalyzed partial dehydrogenation of a hydrocarbon in the gas phase and in the presence of molecular oxygen, in which part of the product gas is recirculated to the reaction zone, and a reactor for carrying out such a process.

Abstract: A process for preparing 1,2-dichloroethane which comprises (A) feeding an ethane-containing feed gas stream into a dehydrogenation zone and dehydrogenating ethane to ethane to give a product gas stream comprising ethane, ethane and secondary constituents, (B) feeding the ethan- and ethene-containing dehydrogenation product gas stream as a single stream or a plurality of substreams, optionally after having separated off secondary constituents, into one or more chlorination zones, chlorinating ethene to 1,2-dichloroethane to give one or more product gas streams comprising 1,2-dichloroethane, ethane and possibly further secondary constituents, isolating 1,2-dichloroethane and one or more ethane-containing circulating gas streams and recirculating the ethane-containing circulating gas stream or streams to the ethane dehydrogenation.

Abstract: A process for preparing surfactant alcohols and surfactant alcohol ethers by derivatization of olefins having about 10 to 20 carbon atoms or of mixtures of such olefins and optional subsequent alkoxylation is described. As features, the process involves (a) subjecting a C4-olefin mixture with a 1-butene/2-butene ratio of ?1.2 to a metathesis, (b) separating off olefins having 5 to 8 carbon atoms from the metathesis mixture, (c) subjecting the separated-off olefins individually or in a mixture to a dimerization to give olefin mixtures having 10 to 16 carbon atoms, (d) subjecting the resulting olefin mixture, optionally after a fractionation, to derivatization to give a mixture of surfactant alcohols and (e) optionally alkoxylating the surfactant alcohols. The olefin mixture obtained in the dimerization comprises a high content of branched components and less than 10% by weight of compounds which contain a vinylidene group.

Abstract: A process for preparing 1,2-dichloroethane which comprises

Abstract: The invention relates to a process for preparing 4-vinylcyclohexene, which comprises the steps

Abstract: The preparation of alkylaryl compounds takes place, inter alia, by a1) preparation of a C4-olefin mixture from LPG, LNG or MTO streams, b1) reaction of the C4-olefin mixture obtained in this way over a metathesis catalyst for the preparation of an olefin mixture comprising 2-pentene and/or 3-hexene, and optional removal of 2-pentene and/or 3-hexene, c1) dimerization of the 2-pentane and/or 3-hexene obtained in stage b1) over a dimerization catalyst to give a mixture comprising C10-12-olefins, and optional removal of the C10-12-olefins, d1) reaction of the C10-12-olefin mixtures obtained in stage a1) with an aromatic hydrocarbon in the presence of an alkylation catalyst to form alkylaromatic compounds, it being possible to add additional linear olefins prior to the reaction.

Abstract: A process prepares methacrylic acid from isobutane by subjecting isobutane to a partial catalytic dehydrogenation in the gas phase and charging an oxidation zone with the isobutenic product gas mixture after the components other than isobutane and isobutene have been substantially removed from the product gas mixture. The oxygen required to charge the oxidation zone is introduced accompanied by nitrogen.

Abstract: A process for preparing at least one partial oxidation and/or ammoxidation product of a hydrocarbon by partially dehydrogenating at least one saturated hydrocarbon H under heterogeneous catalysis and using the resulting product gas mixture A, which comprises the partially dehydrogenated hydrocarbon H, as such or in modified form for heterogeneously catalyzed partial oxidation and/or ammoxidation of the partially dehydrogenated hydrocarbon present in the product gas mixture A, said process including at least one mechanical separating operation inserted between the product gas mixture A and the heterogeneously catalyzed partial oxidation and/or ammoxidation.

Abstract: The invention relates to a process for preparing unsaturated nitrites from the corresponding alkanes which comprises the steps:

Abstract: C2-C30-alkanes are dehydrogenated in a process in which

Abstract: Partial oxidation products and/or ammoxidation products of an olefinic hydrocarbon A′ are prepared by a process in which said olefinic hydrocarbon is produced during normal operation by partial dehydrogenation and/or oxydehydrogenation of hydrocarbon A and fed in from another source during partial or complete nonoperation of the dehydrogenation and/or oxydehydrogenation.

Abstract: A process prepares methacrolein from isobutane by subjecting isobutane to a partial catalytic dehydrogenation in the gas phase and using the isobutenic product gas mixture to charge an oxidation zone in which the isobutene is oxidized to methacrolein in the gas phase with heterogeneous catalysis using molecular oxygen accompanied by molecular nitrogen as the oxygen source.

Abstract: The invention relates to a method for the production of propene from a mixture (M1) essentially consisting of the following: ethylene (component E); hexenes (components H); optionally olefinic hydrocarbons (components K1a) different from ethylene and hexenes and optionally other inert hydrocarbons (components K1b). According to said method, the mixture (M1) is brought into contact with a metathesis catalyst at a temperature of 20 to 350° C., with the proviso that, as regards mixture (M1): the molar proportion of the sum consisting of 2-hexene and 3-hexene in components H is at least 4:1 to 99:1; the molar ratio between component E and the sum of components H and K1a is 1:1 to 100:1; the ratio between 2-hexenes and 3-hexenes is at least 2:1 as long as the 3-hexenes contained in the mixture are not simultaneously subjected to isomerization by means of which the proportion of 2-hexenes is correspondingly increased.

Abstract: Process for preparing at least one partial oxidation and/or ammoxidation product of propylene, in which the propylene is produced from crude propane by dehydrogenation and is subjected to a heterogeneously catalyzed gas-phase partial oxidation and/or partial gas-phase ammoxidation in the presence of unreacted propane as constituent of a gas mixture 2 containing <1% by volume of 1-butene.

Abstract: In a process for preparing at least one partial oxidation and/or ammoxidation product of propylene, the propylene is obtained from crude propane by dehydrogenating and subjected in the presence of unconverted propane as a constituent of a gas mixture 2 which comprises a total C4-hydrocarbon content of ≦3% by volume to a heterogeneously catalyzed gas phase partial oxidation and/or partial gas phase ammoxidation.