Abstract:
In a process for extracting (chlorinated) hyrocarbon-free hydrogen chloride and phosgene-free (chlorinated) hydrocarbons from a hydrogen chloride stream containing (chlorinated) hydrocarbons and phosgene, (i) the fresh hydrogen chloride stream containing phosgene and (chlorinated) hydrocarbons is led in a first step first through a first adsorber and then through a second adsorber interconnected in series, until essentially no more (chlorinated) hydrocarbon is adsorbed by the first adsorber; (ii) the fresh hydrogen chloride stream is led in a second step through the second adsorber, while the first adsorber is regenerated, substantially phosgene-free (chlorinated) hydrocarbon being produced during regeneration; (iii) the fresh hydrogen chloride stream is led in a third step first through the second adsorber and then through the regenerated first adsorber, until substantially no more (chlorinated) hydrocarbon is adsorbed by the second adsorber; (iv) the fresh hydrogen chloride stream is led in a fourth step through the first adsorber, while the second adsorber is regenerated, a substantially phosgene-free (chlorinated) hydrocarbon being produced during regeneration, and steps (i) to (iv) can be successively repeated one or more times.
Abstract:
The present invention relates to a process for the non-oxidative dehydroaromatization of a feed stream containing C1-C4 aliphatics comprising the steps I, feeding the feed stream E into a reaction zone 1, reacting the feed stream E under non-oxidative conditions in the presence of a particulate catalyst to give a product stream P containing aromatic hydrocarbons, and removing the product stream P from the reaction zone 1; II, transferring the catalyst that is reduced in its activity by deposited coke into a reaction zone 2; III, at least partial regeneration of the catalyst with feed of a hydrogen-containing gas stream H in a reaction zone 2, wherein at least some of the deposited coke is converted into methane and a methane-containing gas stream M is formed that is fed at least in part to the reaction zone 1; IV, removing the catalyst from the reaction zone 2 and V, recirculating at least some of the catalyst that is removed to the reaction zone 1, wherein reaction zone 1 and reaction zone 2 are arranged spatially adjacently in the same reactor.
Abstract:
Disclosed is a fluidized bed reactor for carrying out a gas phase reaction. A gaseous reaction mixture flows from the bottom to the top of a heterogeneous particulate catalyst that forms a fluidized bed in which baffles are arranged. Said fluidized bed reactor is characterized in that the baffles divide the fluidized bed into a plurality of cells horizontally disposed in the fluidized bed reactor and a plurality of cells vertically disposed in the fluidized bed reactor, the cell walls being gas-permeable and being provided with openings which ensure that the heterogeneous particulate catalyst reaches a transfer rate ranging from 1 to 100 liters/hour per liter of reactor volume in the vertical direction.