Hybrid autothermal catalytic process for converting alkanes to alkenes and catalysts useful for same

A catalyst, alkane technology, applied in the direction of carbon compound catalyst, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as deactivation of chromium-based catalysts

Inactive Publication Date: 2010-01-13
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, it was found that moisture present in the heated intermediate product stream irreversibly deactivates the chromium-based catalyst in the endothermic second stage

Method used

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  • Hybrid autothermal catalytic process for converting alkanes to alkenes and catalysts useful for same
  • Hybrid autothermal catalytic process for converting alkanes to alkenes and catalysts useful for same
  • Hybrid autothermal catalytic process for converting alkanes to alkenes and catalysts useful for same

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Embodiment

[0075] The following description is about figure 2 Schematic representation of the process equipment shown. Three mild oxidant shift reactors (SOC1, SOC2, SOC3), each comprising an oxidation reaction zone (not shown per se, but see figure 1 and related description above), wherein a suitable catalyst (also not shown per se, but can be found in figure 1 and related description above). One reactor at a time is operated for the conversion of propane to propylene in a heat-integrated mild oxidant conversion process. Catalyst regeneration is performed on a reactor when it is not in use, ie "offline". The mild oxidant shift reactors (SOC1, SOC2, SOC3) are automatically cycled on-line and off-line by a process control system (not shown).

[0076] The fresh (i.e. not containing any recycled material) feedstocks to the mild oxidant conversion reaction zone were: propane (110), 13140 kg / hr; carbon dioxide (111), 8573 kg / hr; nitrogen (112), 5287 kg / hr Hour. In addition to fresh f...

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Abstract

The present invention relates to a thermally integrated multi-zone process for conversion of alkanes to their corresponding alkenes, involving endothermically converting an alkane to its corresponding alkene by soft oxidant conversion in an endothermic reaction zone, in the presence of a weak oxidant, a suitable catalyst, and heat, to produce an intermediate product gas comprising the corresponding alkene and hydrogen. The weak oxidant may be, for example, carbon dioxide. The hydrogen is then removed from the intermediate product gas by contacting the intermediate product gas, in an exothermic reaction zone, with different second catalyst, and oxygen, to combust the hydrogen and produce a heated product stream comprising the corresponding alkene, water and heat. Heat is recovered from theheated product stream and recycled back to the endothermic reaction zone, while the resulting cooled product stream comprising the corresponding alkene may be subjected to further reaction and / or processing.

Description

[0001] government rights [0002] This invention was made with support from the US Department of Energy under Grant No. DE-FC36-O4GO14272. The government has certain rights in this invention. field of invention [0003] The present invention relates to a heat-integrated process for the conversion of alkanes to the corresponding olefins which are subsequently converted by partial catalytic oxidation to oxidation products including unsaturated carboxylic acids and unsaturated nitriles. Background of the invention [0004] Well known commercial processes for the preparation of monomers such as unsaturated carboxylic acids and unsaturated nitriles generally start with one or more olefins and convert them to the desired monomeric products by catalytic gas phase oxidation. Due to the pressure generated by industrial competition, and the price difference between alkanes and corresponding alkenes (such as propane and propylene), efforts are being made to develop a new method, main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/333C07C7/148C07C11/04C07C11/06C07C11/09C01B5/00B01J23/89B01J23/86B01J23/847B01J23/825B01J23/68
CPCC07C2523/26C07C2523/28C07C2523/08C07C2523/02C07C5/3332C07C2523/755C07C5/3335C07C2523/30C07C2523/745C07C2523/22C07C2521/08C07C2521/04Y02P20/50Y02P20/52Y02P20/582C07C11/06B01J23/644B01J23/652C07C5/333
Inventor S·汉W·鲁廷格
Owner ROHM & HAAS CO
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