Organic compounds -- part of the class 532-570 series – Organic compounds – Nitriles
Patent
1996-07-01
1998-12-01
McKane, Joseph
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitriles
C07C25326
Patent
active
058441123
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP96/000096 filed on Jan. 22, 1996.
TECHNICAL FIELD
This invention relates to a process for the preparation of (meth)acrylonitriles by ammoxidation of at least one saturated hydrocarbon selected from the group consisting of propane and isobutane, in which the hydrocarbon is contacted with molecular oxygen and ammonia in the vapor phase.
TECHNOLOGICAL BACKGROUND
(Meth)acrylonitriles have been manufactured in large quantities, as the intermediates for a great variety of industrial products represented by synthetic fibers and synthetic resins. As a conventional production process thereof, ammoxidation is generally known, in which olefinic starting materials, i.e., propylene, isobutene, and the like, are contacted with molecular oxygen and ammonia in the vapor phase, in the presence of a catalyst.
Whereas, with the recent rise in olefin price, development of processes for making the various derivatives which have heretofore been manufactured from olefins, using as the starting materials less expensive paraffins, comes to draw attention. As the catalyst systems used for the production of (meth)acrylonitriles from propane or isobutane by "ammoxidation" 14371/1972!, Sb--Sn oxide catalyst (Kokoku No. 28940/1975), V--Sb oxide 95439/1990 and 261544/1990!, Bi--Mo oxide catalyst (Kokai No. 16887/1973, Kokoku No. 42071/1980, and Kokai No. 157356/1991!, V--P oxide catalyst (Kokoku No. 5188/83), Bi--V oxide catalyst (Kokai No. 295545/1988), etc. are known. Still recently, furthermore, patent applications have been made for V--Sn--Sb--Cu oxide catalyst (Kokai No. 275266/1992), Mo--V--Te--Nb oxide catalyst (Kokai No. 257/1990), Ag--Bi--V--Mo oxide catalyst (Kokai No. 58961/1991), Ga--Bi--Mo or Ta--Bi--Mo oxide catalyst (Kokai No. 58962/1991), Mo--Ta or Mo--Nb oxide catalyst (Kokai No. 213849/1993), etc. Also mixed catalyst systems of a number of above catalyst systems with those having olefin-ammoxidation ability have been proposed (Kokai Nos. 295546/1988, 38051/1989, 17159/1990, 43949/1990, 75347/1990, 111444/1990 and 258065/1990).
Of these methods, those of adding a minor amount of a halide to the reaction systems as a promotor give the nitriles, which are the intended reaction products, at relatively high yield. However, such methods are difficult of industrial practice because of the corrosion problem of the reaction equipments which incurs restrictions on the construction materials of the equipments. On the other hand, methods not using any promotor give only low yield of nitrites and have not reached an industrially practiceable level.
DISCLOSURE OF THE INVENTION
Accordingly, therefore, the object of the present invention resides in provision of a method which is free of those defects in the conventional methods and which enables production of (meth)acrylonitriles at high yields and with industrial advantages.
We have made concentrative studies on production of (meth)acrylonitriles by ammoxidation process in which at least one saturated hydrocarbon selected from the group consisting of propane and isobutane is contacted with a mixed gas comprising molecular oxygen and ammonia in the vapor phase in the presence of a catalyst, to discover that nitrile yields higher than those obtainable in conventional methods can be achieved by use of a catalyst composed of a complex oxide containing oxides of three elements of chromium, antimony and tungsten as the essential components, which is supported on a refractory inorganic carrier, if necessary, and completed the present invention.
Thus, according to the invention a process is provided which comprises preparation of (meth)acrylonitriles by catalytically oxidizing propane and/or isobutane in the vapor phase, with molecular oxygen and ammonia in the presence of a catalyst, said process being characterized by use of a catalyst composed of a complex oxide which is expressed by the general formula (I) below: and W, respectively, where, when .alpha. is 1,.beta. is 0.5-5 and .gamma. is 0.2-2; and x is a value determined by valence of the exi
REFERENCES:
patent: 5008427 (1991-04-01), Brazdil, Jr. et al.
patent: 5093299 (1992-03-01), Suresh et al.
Kishimoto Nobuji
Kurusu Akira
Matsunami Etsushige
Nakamura Isao
McKane Joseph
Nippon Shokubai Co. , Ltd.
Sackey Ebenezer
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