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Hybrid catalyst systems and hybrid process for converting alkanes to alkenes and to their corresponding oxygenated products

A technology of mixing catalysts and catalysts, which is applied in the direction of catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., and can solve problems such as costly removal and prohibitive industrial scale.

Inactive Publication Date: 2006-06-07
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this endothermic process requires costly hydrogen removal in the first step, making the process prohibitive on an industrial scale

Method used

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preparation example Construction

[0183] The present invention also provides a method for the preparation of metal oxide and mixed metal oxide catalysts for the conversion of alkanes to the corresponding alkenes and oxidation products under short contact times, the method comprising the steps of:

[0184] mixing salts of metals selected from Mo, Te, V, Ta and Nb at a temperature higher than the melting point of the highest melting salt to form a miscible molten salt; and

[0185] The mixture of salts is calcined in the presence of oxygen to provide a mixed metal oxide catalyst, optionally using a metal halide or metal oxyhalide salt as a solvent.

[0186] Raw materials for the above mixed metal oxide are not limited to those described above. A very wide variety of materials can be used including, for example, oxides, nitrides, halides or oxyhalides, alkoxides, acetylacetonates, and organometallic compounds. For example, ammonium heptamolybdate can be used as the source of molybdenum for the catalyst. But as ...

Embodiment 2

[0330] Catalytic conversion of isobutane to methacrylic acid using Pt / Na-[Fe]-ZSM-5 type under short contact time. The catalyst has been proved by L. Schmidt et al. to show high selectivity for the conversion of propane to propylene in the conventional oxidative dehydrogenation reaction. Adding a small amount of Pt will make the catalyst suitable for the flame temperature in SCTR. It is expected that the introduction of phosphorus in ZSM-5 can further improve the selectivity and yield of conventional alkane conversion. The effluent gas stream is introduced into the second catalyst zone for selective oxidation. Also useful at this stage is the addition of one or more additional oxidants selected from air, oxygen, carbon dioxide and nitrous oxide, including additional steam and fuel in the form of oxidized hydrogen. Useful or desirable oxidation products produced include methacrylic acid and methacrylate esters. Esters require additional alcohols, and higher homologues also r...

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Abstract

Alkenes, unsaturated carboxylic acids, saturated carboxylic acids and their higher homologues are produced cumulatively from the corresponding alkanes by using a mixed catalyst system and a hybrid process comprising steam cracking of alkanes to the corresponding alkenes and using one or more oxidation catalyst, thereby further catalytically converting the corresponding olefin to the corresponding oxidation product under short contact time reactor conditions.

Description

[0001] This application claims priority to US Provisional Patent Application Serial No. 60 / 523,297, filed November 18,2003. technical field [0002] The present invention relates to alkane oxidation / dehydrogenation catalysts and processes for the conversion of alkanes and oxygen to dehydrogenated and / or oxygenated products at flame temperatures. More specifically, the present invention relates to a hybrid process that includes, but is not limited to, the conversion of alkanes to the corresponding olefins by steam cracking, followed by conversion of the olefins to the corresponding oxygenates under short contact time reactor conditions. Among other things, the present invention relates to methods for converting specific alkanes to the corresponding alkenes and including unsaturated carboxylic acids, saturated carboxylic acids, esters of unsaturated carboxylic acids and their respective A catalyst system for oxygenates of higher homologues; a method for preparing the catalyst sy...

Claims

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Application Information

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IPC IPC(8): B01J23/54B01J23/76B01J37/02C07B35/04C07C5/333C07C11/00C07C51/25C07C53/00C07C57/00
CPCB01J23/00B01J29/46C07C51/215C07C51/252Y02P20/50C07C57/04B01J23/16B01J23/68B01J37/02
Inventor A·本德利A·M·加夫尼S·E·约翰逊
Owner ROHM & HAAS CO
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