Abstract:
1,135,831. Manufacture of aromatic vinyl aldehydes and nitriles. STANDARD OIL CO. 6 Jan., 1966 [6 Jan., 1965], No. 676/66. Heading C2C. Aromatic vinyl aldehydes or nitriles of the formula wherein R 11 and R 111 are always different and each represents hydrogen, a-CN or a-CHO group, at least one of R 11 and R 111 being always hydrogen and the other being -CN or -CHO, and wherein Ar is phenyl, naphthyl, anthryl or phenanthryl are obtained by reacting a monoolefinically substituted aromatic hydrocarbon of the formula wherein R and R 1 are always different and each represents hydrogen or a methyl group, with (a) oxygen to form the corresponding aldehyde, or (b) a mixture of ammonia and oxygen to form the corresponding nitrile, over a catalyst comprising at least one polyvalent metal oxide or salt at a temperature within the range 300- 800‹ C. The catalyst, which may be used alone or supported on, or impregnated in, a carrier material, may also include further metal oxides as promoters, and the process is suitably carried out at a pressure of 1 to 3 atmospheres gauge. Many catalyst systems are described but a preferred catalyst system comprises antimony and uranium oxides, optionally together with a metal oxide promoter; in the specific examples using such catalyst systems, atroponitrile, atropaldehyde, cinnamaldehyde and cinnamonitrile are prepared, by-products such as benzonitrile, benzaldehyde and quinoline also being formed.
Abstract:
Diolefins or aromatic hydrocarbons are obtained from a C4-C8 mono-olefin free from quaternary carbon atoms by reaction with oxygen in contact with a fluidized solid oxide catalyst in a plurality of communicating reaction zones. Many catalysts are specified and are preferably arranged in superposed zones in a reactor separated by perforated plates. In one embodiment, the hydrocarbon is introduced into a zone above the bottom and oxygen introduced into the bottom zone to effect regeneration. The temperature may be 325-1000 DEG C., the pressure 0-300 p.s.i.g., contact time 0.1-50 seconds, oxygen to olefin mol. ratio 0.3-3 : 1 and water (if added) to olefin mol. ratio 0.1-6 : 1. Aromatics are generally obtained from cyclic olefins and diolefins from acyclic olefins. Specifications 902,952, 971,036 and 971,038 are referred to.
Abstract:
In a process for making a bismuth silico-molybdate or bismuth silico-phosphomolybdate catalyst for oxidation reactions in a fluidized bed, a slurry of the ingredients of the catalyst containing 1 to 10% by weight of ammonium nitrate is prepared, the slurry is spray dried to obtain spherical particles, and the particles are calcined at 700 DEG to 1100 DEG F. The ammonium nitrate may be added to the slurry as a compound or may be formed in situ by reaction of other ingredients of the slurry. In an example a slurry is prepared from an aqueous silica sol, phosphoric acid, an aqueous solution of ammonium heptamolybdate, and a nitric acid solution of bismuth nitrate, the slurry is spray dried and calcined. Other suitable ingredients mentioned are ammonium dimolybdate and phosphomolybdic acid. The composition may contain 4,5 to 55% by weight of bismuth, 2,5 to 32% by weight of molybdenum, 0,6 to 42% by weight of silicon, 20 to 50% by weight of oxygen and 0 to 5% by weight of phosphorus. The size of the particles may be between 5 and 250 microns.
Abstract:
Methacrylonitrile is manufactured by contacting a mixture of isobutylene, ammonia and oxygen at a temperature of 550-1,100 DEG F. with a catalyst composition corresponding to the formula SbaFebOc, in which a is a number from 1 to 99, b is a number from 50 to 1 and c is a number which satisfies the average valencies of antimony and iron in the oxidation states in which they exist in the catalyst. In the mixture of isobutylene, ammonia and oxygen used, the molar ratio of ammonia to isobutylene is from 0.05:1 to 5:1 and the molar ratio of oxygen to isobutylene is from 0.5:1 to 4:1. If desired the catalyst may be supported on conventional supports and may be activated before use by heating. Saturated hydrocarbons, water and diluents such as nitrogen and oxides of carbon may be present in the reaction mixture. Specifications 867,438 and 876,446 are referred to.