Abstract:
The invention relates to a method for hydrocarbon conversion in the presence of an acidic ionic liquid. The hydrocarbon conversion is preferably an isomerization, in particular an isomerization of methylcyclopentane (MCP) to form cyclohexane. Before the hydrocarbon conversion, a hydrogenation is performed. Preferably, benzene is hydrogenated to form cyclohexane. The cyclohexane arising in the hydrogenation and/or isomerization is preferably isolated from the method. In a preferred embodiment of the invention, low boilers, in particular C 5 -C 6 alkanes such as cyclopentane or isohexanes, are removed by distillation from the hydrocarbon mixture used for the hydrocarbon conversion after the hydrogenation and before the hydrocarbon conversion.
Abstract:
The present invention concerns a process for preparing cyclohexane from methylcyclopentane (MCP) and benzene. In the present invention, MCP and benzene are constituents of a hydrocarbon mixture (KG1) also including dimethylpentanes (DMP), optionally cyclohexane and optionally at least one compound (low boiler) selected from non-cyclic C 5 -C 6 alkanes and cyclopentane. First, benzene is reacted in a hydrogenation step to give cyclohexane (present in the hydrocarbon mixture (KG2)), while MCP is isomerized to cyclohexane in the presence of a catalyst, preferably an acidic ionic liquid. After the hydrogenation but before the isomerization, the dimethylpentanes (DMP) are removed, and initially the cyclohexane present in the hydrocarbon mixture (KG2) is removed together with DMP. This pre-isomerization cyclohexane can be freed of DMP again in a downstream step of rectification and isolated and/or returned to the cyclohexane preparation process. If the hydrocarbon mixture (KG1) comprises low boilers, they can be removed between DMP removal and MCP isomerization. Following the isomerization comes the isolation of the cyclohexane, with optional recycling of unisomerized MCP and any low boilers. The hydrocarbon mixture (KG1) preferably includes cyclohexane and/or low boilers, and so low-boiler removal between DMP removal before isomerization is a preferred operation. Also preferred is an additional removal of DMP from the cyclohexane - that is, the cyclohexane fraction arising from the benzene hydrogenation and possibly forming part of the starting mixture (KG1) is isolated and hence recovered.
Abstract:
The invention relates to a method, preferably an isomerization method, for chemically converting at least one hydrocarbon in the presence of an ionic liquid and a hydrogen halide (HX). The chemical conversion is carried out in a device (V1), a gas phase being in direct contact with a liquid reaction mixture in the device (V1). The gas phase and the liquid reaction mixture each contain the hydrogen halide, and at least one hydrocarbon and the ionic liquid are additionally contained in the liquid reaction mixture. Gaseous HX is introduced into the device (V1) such that the hydrogen halide partial pressure is kept at a constant level in the gas phase. Among others, the ionic liquid used in the respective chemical conversion, in particular in an isomerization method, can be regenerated using the method according to the invention.
Abstract:
The invention relates to a chemical conversion process, preferably an isomerization process, of at least one hydrocarbon in the presence of an ionic liquid. The chemical conversion process is carried out in a dispersion in which the hydrocarbon (phase (B)) is dispersed in the ionic liquid (phase (A)), the proportion by volume between phase (A) and phase (B) ranging from 2.5-4 to 1 [vol/vol].
Abstract:
The invention relates to a method for separating a phase (A), which contains at least one ionic liquid, from a phase (B), wherein the phase (A) has a higher viscosity than the phase (B), comprising the following steps: a) providing a current (S1) containing a dispersion (D1), in which the phase (A) is dispersed in the phase (B), b) introducing the current (S1) to a coalescing device (KV), wherein the inflow velocity of the current (S1) equals 0.05 to 150 kg/(cm 2 *h) based on the average cross-sectional area of the coalescing device (KV). c) separating the dispersed phase (A) from the phase (B) in the coalescing device (KV), d) channeling out a current (S2) comprising at least 70 wt%, preferably at least 90 wt% of phase (A) from the coalescing device (KV) and e) channeling out a current (S3) comprising at least 70 wt%, preferably at least 90 wt% of phase (B) from the coalescing device (KV).
Abstract:
The invention relates to a method, preferably an isomerization method, for chemically converting at least one hydrocarbon in the presence of an ionic liquid. The chemical conversion is carried out in a device (V1), and at least one metal halide, preferably aluminum halide, is added into the device (V1) periodically or continuously. The anion of the ionic liquid which is used comprises at least one metal component and at least one halogen component. The anion of the ionic liquid matches the metal halide added into the device (V1) with regard to the respective halogen component and the metal component. Among others, the ionic liquid used in the respective chemical conversion, in particular in an isomerization method, can be regenerated using the method according to the invention.
Abstract:
The present invention relates to a method for producing cyclohexane from benzene and/or methylcyclopentane (MCP) by hydrogenation or isomerisation. Prior to cyclohexane production, the dimethylpentanes (DMP) are separated in a distillation device (D1) from a hydrocarbon mixture (KG1) which contains DMP in addition to benzene and/or MCP. If cyclohexane is already present in the hydrocarbon mixture (KG1), the cyclohexane is separated initially with DMP in conjunction with benzene and/or MCP. The already present cyclohexane can be re-separated from DMP in a subsequent distillation step and can be recycled into the process in order to produce cyclohexane.