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Process for methane conversion

A methane, conversion technology, applied in organic chemistry, hydrocarbons, bulk chemical production, etc., can solve problems such as high exothermic carbon oxides

Inactive Publication Date: 2009-06-17
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the problem plaguing this oxidative coupling method is that the oxidative coupling method involves a highly exothermic and potentially dangerous methane combustion reaction and its production of large amounts of environmentally sensitive carbon oxides

Method used

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  • Process for methane conversion
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Examples

Experimental program
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Effect test

Embodiment 1

[0224] The Mo / ZSM-5 catalyst was prepared by NH 4 The required amount of ammonium heptamolybdate (ammonium heptamolybdate) solution (Si / Al) was impregnated on the ZSM-5 carrier 2 Ratio 28) by incipient wetness followed by drying at 120°C for 2 hours and then final calcination at 500°C for 6 hours in flowing air. A nominal molybdenum loading of 2.7 wt.% (wt.% metal based on total catalyst weight) was targeted; although secondary variables in molybdenum loading did not affect the conclusions obtained. Each Mo / ZSM-5 catalyst sample (after calcination) was pelletized, crushed, and sieved to a 30-60 mesh particle size. Catalyst tests of the Mo / ZSM-5 catalyst were carried out in a quartz reactor, which was filled to form a fixed-bed using a quartz wool support.

[0225] Catalytic implementation of methane dehydrocyclization to benzene using 95 wt.% CH 4 - 5 wt.% argon feed (argon used as internal standard) at different temperatures with a weight hourly space velocity (based on me...

Embodiment 2

[0267] Based on the model expected to favor the inverse temperature distribution, a laboratory-scale unit was constructed to confirm the model results. While the model is oriented towards the operation of the reaction system as a settled bed, the laboratory reactor is a fixed bed of catalyst with an inverse temperature distribution, which is influenced by the use of external heaters. In all cases, the experimentally obtained conversions were lower than those predicted by the model. This result may be due to laboratory-scale experimental artifacts such as bed splitting and or / back mixing caused by the hydrodynamic conditions in the laboratory-scale reactor operation.

[0268] Molybdenum / ZSM-5 catalyst via MoO with 7.5 wt% molybdenum (metal wt% based on the total weight of the catalyst) 3 with NH 4 ZSM-5 carrier (Si / Al 2 ratio of 25) ball milling for 2 hrs, followed by calcination in air at 500°C for 5 hrs. The catalyst was granulated, crushed and then sieved to a 20-40 mesh...

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Abstract

A process for converting methane to higher hydrocarbon(s) including aromatic hydrocarbon(s) in a reaction zone comprises providing to a hydrocarbon feedstock containing methane and a catalytic particulate material to the reaction zone and contacting the catalytic particulate material and the hydrocarbon feedstock in a substantially countercurrent fashion in the reaction zone, while operating the reaction zone under reaction conditions sufficient to convert at least a portion of said methane to a first effluent having said higher hydrocarbon(s).

Description

technical field [0001] This description relates to methods for methane conversion. In particular, the present description relates to methods for the conversion of natural gas. Background technique [0002] Aromatics, especially benzene, toluene, ethylbenzene, and xylenes, are important, mass-produced chemicals in the petrochemical industry). Currently, aromatics are most commonly produced from petroleum-based feedstocks by various processes including catalytic reforming and catalytic cracking. However, as the world's supply of petroleum feedstocks dwindles, there is a growing need to find alternative sources of aromatics. [0003] A viable alternative source of aromatics is methane, a major component of natural gas and biogas. The world's natural gas reserves are increasing and more natural gas than crude oil is currently being discovered. Because of the large-volume transportation of natural gas, especially in remote areas, most of the natural gas produced with crude oi...

Claims

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Application Information

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IPC IPC(8): C07C2/76C10G50/00
CPCC10G50/00C07C2/76Y10S585/943C10G2400/30C10G2300/1025Y02P20/52C07C15/02C07C15/04
Inventor L·L·亚奇诺N·桑加尔E·L·斯塔文斯M·J·文森特
Owner EXXONMOBIL CHEM PAT INC
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