PREPARATION OF MALEIC ANHYDRIDE FROM FOUR-CARBON HYDROCARBONS

    公开(公告)号:CA1086325A

    公开(公告)日:1980-09-23

    申请号:CA258387

    申请日:1976-08-04

    Abstract: Catalysts comprising the combined oxides of vanadium and at least one element selected from the group consisting of boron, niobium, tantalum, antimony, tungsten and chromium have been found to be especially effective in the oxidation of n-butane, n-butenes and butadiene, or a mixture thereof with molecular oxygen in the vapor phase to yield maleic anhydride. The catalysts of the present invention may be further promoted with additional elements to enhance activity, stability and selectivity. The reaction with n-butane gives an especially pure product in good yield and selectivity.

    PROCESS FOR REACTIVATING A FLUID BED CATALYST IN A REACTOR DIPLEG

    公开(公告)号:MY132015A

    公开(公告)日:2007-09-28

    申请号:MYPI9502771

    申请日:1995-09-19

    Abstract: THE PRESENT INVENTION RELATES TO IMPROVEMENTS OF FLUID BED CATALYSTS. MORE PARTICULARLY, THE PRESENT INVENTION RELATES TO IMPROVEMENTS OF FLUID BED OXIDATION CATALYSTS USEFUL IN THE PREPARATION OF MALEIC ANHYDRIDE FROM C4 HYDROCARBONS, INCLUDING N-BUTANE. THE PRESENT INVENTION INCLUDES A PROCESS OF CONTACTING A FLUID BED CATALYST WITH A REACTIVATING AGENT IN A CATALYST STANDPIPE. THE PRESENT INVENTION ALSO PROVIDES A CATALYST CONTAINING THE MIXED OXIDES OF VANADIUM AND PHOSPHORUS, TREATED USING THE ABOVE PROCESS. THE PRESENT INVENTION FURTHER PROVIDES A PROCESS FOR PRODUCING MALEIC ANHYDRIDE, UTILIZING THE CATALYST PREPARED USING THE ABOVE PROCESS. THE PRESENT INVENTION ADDITIONALLY PROVIDES FOR A REACTOR STANDPIPE, UTILIZED FOR REGENERATING CATALYST ACCORDING TO THE ABOVE PROCESS.

    PROCESO DE TRATAMIENTO PARA CORRIENTES DE AGUAS RESIDUALES DE UNA PLANTA DE ACRILONITRILO.

    公开(公告)号:MX9602020A

    公开(公告)日:1997-11-29

    申请号:MX9602020

    申请日:1996-05-29

    Abstract: Un proceso para la destruccion de residuos orgánicos y amoníaco proveniente de agua residual de una planta de acrilonitrilo, que comprende poner en contacto agua residual volatilizada con un catalizador a temperatura elevada para convertir los compuestos orgánicos volátiles y el amoníaco en una mezcla que comprende hidrogeno, nitrogeno y dioxido de carbono los cuales se separan y eliminan de la corriente, produciendo una corriente acuosa purificada, substancialmente libre de compuesto orgánico y de amoníaco.

    MIXED VANADIUM PHOSPHORUS OXIDE CATALYSTS AND PREPARATION THEREOF

    公开(公告)号:CA1150232A

    公开(公告)日:1983-07-19

    申请号:CA370280

    申请日:1981-02-06

    Abstract: The present invention provides improved oxidation catalysts containing mixed oxides of vanadium and phosphorus and the method for the preparation thereof, which catalysts are particularly effective in the oxidation of n-butane, nbutenes, 1,3-butadiene or a mixture thereof with molecular oxygen or an oxygen-containing gas in the vapor phase to produce excellent yields of maleic anhydride with very good selectivity. At least one vanadium compound, a substantial portion of which is in the pentavalent state, and at least one phosphorus-containing compound is added to an organic liquid medium capable of reducing at least a portion of the vanadium to a +4 valence state, to form a reaction mixture. Partial reduction of the vanadium is effected in the presence of the phosphorus-containing compound and a highly ordered and uniform mixed vanadium phosphorus oxide-containing catalyst precursor is formed.

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