Abstract:
The invention relates to a method for producing cyclohexane by isomerizing a hydrocarbon mixture (KG1) containing methylcyclopentane (MCP) in the presence of a catalyst. The catalyst is preferably an acidic ionic liquid. A flow (S1) originating from a steam cracking process is used as a starting material. The hydrocarbon mixture (KG1) is obtained from said stream (S1) in a device for removing aromatics. The hydrocarbon mixture has a reduced aromatic content in comparison with the flow (S1). (KG1) can also be (nearly) free of aromatics. In dependence on the type and amount of the aromatics remaining in the hydrocarbon mixture (KG1), in particular if benzene is present, a hydrogenation of (KG1) additionally can be performed before the isomerization. Furthermore, additional purification steps can optionally be performed before or after the isomerization or hydrogenation in dependence on the presence of other components of (KG1). Preferably high-purity cyclohexane (in accordance with specifications) is isolated from the hydrocarbon mixture (KG2) arising during the isomerization, wherein the specifications are given, for example, by the use of the cyclohexane for the production of caprolactam known to the person skilled in the art.
Abstract:
The invention relates to a method for autothermal gas phase dehydrogenation of a hydrocarbon-containing gas stream (2) with an oxygen containing gas stream (3), obtaining a reaction gas mixture in the presence of a heterogeneous catalyst which is constructed as a monolith (4), and regeneration of the catalyst in a reactor (1) in the form of a cylinder or prism, wherein: - the interior of the reactor (1) is subdivided by a plain cylindrical or prismatic gas-tight housing (G) that is arranged in the longitudinal direction of the reactor (1) into; - an internal region A and; - an external region B arranged coaxially to the internal region A, which is characterized in that the reactor is operated alternately in the production mode for the autothermal gas phase dehydrogenation, and in the regeneration mode, wherein: - the production mode for the autothermal gas phase dehydrogenation is run until the temperature elevation of the reaction gas mixture on exit of same from the discharge line ( 11) does not exceed 5 K, based on the time point from which the conversion rate fluctuates by no more than 1 %, based on the final conversion rate, whereupon; - the reactor is switched into the regeneration mode, with supply of an inert regeneration gas which contains at least 10% by weight oxygen, based on the total weight of the regeneration gas.
Abstract:
THE INVENTION RELATES TO A PROCESS FOR WORKUP OF A STREAM (1) COMPRISING BUTANE AND/OR BUTADIENE, BUTANE, HYDROGEN AND/OR NITROGEN AND CARBON DIOXIDE, COMPRISING THE FOLLOWING STEPS: (A) ABSORPTION OF THE STREAM (1) COMPRISING BUTANE AND/OR BUTADIENE, BUTANE, HYDROGEN AND/OR NITROGEN, WITH OR WITHOUT CARBON DIOXIDE, WITH A MIXTURE (5) COMPRISING 80 TO 97% BY WEIGHT OF N-METHYLPYRROLIDONE AND 3 TO 20% BY WEIGHT OF WATER TO OBTAIN A STREAM (9) COMPRISING N-METHYLPYRROLIDONE, WATER, BUTANE AND/OR BUTADIENE, AND BUTANE, WITH OR WITHOUT CARBON DIOXIDE, AND A STREAM (7) COMPRISING HYDROGEN AND/OR NITROGEN AND BUTANE, (B) EXTRACTIVE DISTILLATION OF THE STREAM (9) COMPRISING N-METHYLPYRROLIDONE, WATER, BUTANE AND/OR BUTADIENE, AND BUTANE, WITH OR WITHOUT CARBON DIOXIDE, WITH A STREAM (13) COMPRISING 80 TO 97% BY WEIGHT OF N-METHYLPYRROLIDONE AND 3 TO 20% BY WEIGHT OF WATER TO SEPARATE THE STREAM (9) COMPRISING N-METHYLPYRROLIDONE, WATER, BUTANE AND/OR BUTADIENE, AND BUTANE, WITH OR WITHOUT CARBON DIOXIDE, INTO A STREAM (17) COMPRISING N-METHYLPYRROLIDONE, WATER, BUTANE AND/OR BUTADIENE, AND A STREAM (15) COMPRISING ESSENTIALLY BUTANE, WITH OR WITHOUT CARBON DIOXIDE, (C) DISTILLATION OF THE STREAM (17) COMPRISING N-METHYLPYRROLIDONE, WATER BUTANE AND/OR BUTADIENE INTO A STREAM (23) COMPRISING ESSENTIALLY N-METHYLPYRROLIDONE AND WATER, AND A STREAM (21) COMPRISING BUTANE AND/OR BUTADIENE. (FIGURE 1)
Abstract:
The present invention relates to a process for nonoxidatively dehydroaromatizing a reactant stream comprising C1-C4-aliphatics by converting the reactant stream in the presence of a catalyst in a reaction zone 1 to a product stream P comprising aromatic hydrocarbons, and regenerating the catalyst whose activity has been reduced by deposited coke with a hydrogen-comprising mixture H in a reaction zone 2, wherein at least a portion of the deposited coke is converted to methane and at least a portion of the methane formed is fed to reaction zone 1.
Abstract:
The present invention relates to a process for nonoxidatively dehydroaromatizing a reactant stream comprising C1-C4-aliphatics by converting the reactant stream in the presence of a catalyst in a reaction zone 1 to a product stream P comprising aromatic hydrocarbons, and regenerating the catalyst whose activity has been reduced by deposited coke with a hydrogen-comprising mixture H in a reaction zone 2, wherein at least a portion of the deposited coke is converted to methane and at least a portion of the methane formed is fed to reaction zone 1.