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Dehydrogenation method

A technology of dehydrogenation and dehydrogenation catalyst, applied in the field of dehydrogenation of cyclohexane and methylcyclopentane, which can solve the problem of low selectivity

Inactive Publication Date: 2016-01-20
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these early proposals for the hydroalkylation of benzene suffered from low selectivity to cyclohexylbenzene, especially at economically viable benzene conversions, and the generation of large amounts of undesired by-products, especially Cyclohexane and Methylcyclopentane
Conversion of methylcyclopentane is also desirable, but not as important as cyclohexane because there is an almost 9°C difference in the boiling points of methylcyclopentane and benzene

Method used

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Examples

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Embodiment 1

[0068] Example 1: Dehydrogenation of Cyclohexane

[0069] A first dehydrogenation catalyst comprising 1 wt% platinum and 0.15 wt% tin on a silica support and a second dehydrogenation catalyst (comparative) comprising 1 wt% platinum and 1 wt% potassium on a silica support were crushed to 60 / 100 mesh and loaded into a 1 / 2" (1.27cm) outer diameter (OD) tubular downflow reactor. The catalyst was then separately mixed with 89 wt% benzene, 10 wt% cyclohexane and 1 wt% methylcyclo Composition of pentane at 480°C, 0.689MPa, 10hr -1 Weight hourly space velocity (WHSV) and 4 hydrogen and hydrocarbon (H 2 / HC) molar ratio of dehydrogenation conditions. Such as figure 1 As shown, the Pt / Sn / SiO 2 Catalyst and the Pt / K / SiO 2 Catalysts achieve significantly higher conversions and selectivities of cyclohexane.

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Abstract

Disclosed herein are processes for the dehydrogenation of saturated cyclic hydrocarbons and / or 5-membered ring compounds using dehydrogenation catalysts. The dehydrogenation catalyst comprises: (i) 0.05wt%-5wt% of a metal selected from Group 14 of the Periodic Table; and (ii) 0.1wt%-10wt% of a metal selected from Group 6-10 of the Periodic Table Metal. The process is carried out under dehydrogenation conditions effective to dehydrogenate at least a portion of the saturated cyclic hydrocarbons and / or 5-membered ring compounds.

Description

[0001] Claims of priority to related applications [0002] This application claims priority to US Provisional Application Serial No. 61 / 468,298, filed March 28, 2011, and European Application No. 11166684.8, filed May 19, 2011, the disclosures of which are incorporated herein by reference in their entirety. [0003] Cross References to Related Applications [0004] This patent application is related to US Provisional Application Serial No. 61 / 424,242, filed December 17, 2010, and PCT Application Serial No. PCT / US2010 / 061041, filed December 17, 2010. technical field [0005] The present invention relates to the dehydrogenation of saturated cyclic hydrocarbons such as cyclohexane and / or methylcyclopentane, especially cyclohexane and methylcyclopentane produced during the hydroalkylation of benzene to cyclohexylbenzene Methods. Background technique [0006] Cyclohexylbenzene can be prepared from benzene by hydroalkylation or reductive alkylation. In this process, benzene is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/367C07C2/74C07C15/04C07C13/28
CPCC07C5/325C07C2523/14C07C2523/42C07C2523/62C07C13/20C07C5/367
Inventor 陈诞仁J·M·达卡T·E·埃尔顿F·M·贝尼特斯C·M·史密斯L·C·德考尔
Owner EXXONMOBIL CHEM PAT INC
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