Organic compounds -- part of the class 532-570 series – Organic compounds – Nitriles
Patent
1996-09-12
1998-07-14
Richter, Johann
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitriles
502212, 502221, 502246, 502255, 502259, B01J 2108, B01J 2112, B01J 27192, C07C25326
Patent
active
057806640
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical field
The present invention relates to a catalyst composition for use in ammoxidation of propylene or isobutylene in the gaseous phase. More particularly, the present invention is concerned with an ammoxidation catalyst composition comprising an oxide catalyst and a silica carrier having the oxide catalyst supported thereon, the oxide catalyst comprising oxides of molybdenum, bismuth, iron, and at least one element selected from potassium, rubidium and cesium, wherein bismuth, iron and the at least one element are present in specific proportions, the ammoxidation catalyst composition being one which has been prepared using as a source of silica a silica sol having an extremely low content of aluminum. When the ammoxidation catalyst composition of the present invention is used in producing acrylonitrile from propylene, or methacrylonitrile from isobutylene, on a commercial scale, the desired acrylonitrile or methacrylonitrile can be produced with high selectivity.
2. Prior art
There has been well known a process for producing acrylonitrile from propylene, or methacrylonitrile from isobutylene, by gaseous-phase ammoxidation of the propylene or of the isobutylene, which comprises reacting propylene with, or reacting isobutylene with ammonia and a molecular oxygen-containing gas. This process, which has been widely known as an ammoxidation process, has been practiced on a commercial scale. With respect to catalysts for use in this ammoxidation process and methods for preparing the same, a number of proposals have been made, wherein the catalysts have compositions containing molybdenum, bismuth and iron.
For example, in U.S. Pat. No. 4,965,393, U.S. Pat. No. 5,071,814, U.S. Pat. No. 4,192,776, Examined Japanese Patent Application Publication No. 54-12913, U.S. Pat. Nos. 4,123,453, 3,746,657, 4,264,476, 4,228,098, 4,290,922, 4,139,552, 4,162,234, 4,443,556, 4,600,541 and 5,093,299, oxide catalysts and methods for producing the same are disclosed wherein the oxide catalysts have multi-component compositions containing molybdenum, bismuth and iron.
In all of the above patent documents, the oxide catalyst is supported on a silica carrier and, in a method for producing such an oxide catalyst, a silica sol is used as a source of silica. However, with respect to the purity of the silica sol, no description is found in those patent documents.
DISCLOSURE OF THE INVENTION
With respect to an ammoxidation catalyst composition for use in ammoxidation of propylene or isobutylene, comprising an oxide catalyst comprised of oxides of molybdenum, bismuth, iron, and at least one element selected from potassium, rubidium and cesium, and a silica carrier having the oxide catalyst supported thereon, the present inventors have made extensive and intensive studies on physical and chemical properties of a silica sol to be used as a source of the silica. As a result, it has been found that by use of a catalyst composition prepared using a high purity silica sol having an extremely low content of aluminum as an impurity, the desired acrylonitrile or methacrylonitrile can be produced with high selectivity. The present invention has been completed based on this novel finding.
Accordingly, it is an object of the present invention to provide an improved ammoxidation catalyst composition comprising an oxide catalyst and a silica carrier having the oxide catalyst supported thereon, the oxide catalyst composition comprising oxides of molybdenum, bismuth, iron, and component A which is at least one element selected from potassium, rubidium and cesium, which ammoxidation catalyst composition, when used for producing acrylonitrile from propylene, or methacrylonitrile from isobutylene on a commercial scale, is capable of producing the desired acrylonitrile or methacrylonitrile with high selectivity.
It is another object of the present invention to provide a process for producing acrylonitrile from propylene, or methacrylonitrile from isobutylene, using the above-mentioned improved ammoxidation catalyst c
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Asahi Kasei Kogyo Kabushi Kaisha
Oswecki Jane C.
Richter Johann
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