Nitto Chemical Industry Co., Ltd.

Mitsubishi Rayon Company, Limited

Hiroshi Utsumi

Yutaka Sasaki

Yoshimi Nakamura

Kiyoshi Moriya

Akimitsu Morii

Kazuo Morishita

Masato Otani

Kunio Mori

Tomio Nakamura

Shigeru Saito

Kenichi Miyaki

Shinji Yamamoto

Hiroshi Yamamoto

Toshio Nakamura

Hiroshi Murata

Miki Kunitani

Mikio Noda

Process for preparing carbocyclic or heterocyclic nitriles by vapor phase ammoxidation

The present invention provides a process for preparing carbocyclic or heterocyclic nitrites by the vapor phase contact ammoxidation of carbocyclic compounds or heterocyclic compounds, in which the reaction is carried out effectively without the increase of the amount of ammonia or oxygen used or the introduction of steam to give the nitrites as the objective products stably with the passage of time in a high yield with a high selectivity. A process for preparing carbocyclic or heterocyclic nitriles comprising subjecting the corresponding starting carbocyclic or heterocyclic compounds to ammoxidation via the vapor phase catalytic reaction in a fluidized bed reactor, in which the reaction is carried out in the presence of a metal oxide fluidized bed catalyst containing vanadium and/or molybdenum as the catalyst, oxygen-containing gas being supplied through an oxygen-containing gas inlet provided at the bottom of the fluidized bed reactor, the starting cyclic compound and ammonia being supplied at a level higher than the oxygen-containing gas inlet, a fluidized bed being formed so that the ratio of the amount of catalyst (Wb) fluidized at a level higher than the inlet of the starting cyclic compound to the amount of catalyst (Wa) fluidized at a level higher than the oxygen-containing gas inlet in the reaction zone is in the range of Wb/Wa&equals;0.05 to 0.9 by weight.

A process for producing prussic acid by subjecting methanol to a gas-phase contact reaction with molecular oxygen and ammonia in the presence of a catalyst, wherein said catalyst is an oxide composition containing iron, antimony, phosphorus and vanadium with a content of vanadium content being at least 0.6 in terms of atomic ratio relative to iron content taken as 10, and a mixed raw material gas for the gas-phase contact reaction contains oxygen at an oxygen-to-methanol molar ratio of less than 1.6.

Process for production of prussic acid

An iron-antimony oxide catalyst for use in the production of hydrogen cyanide by the vapor phase catalytic ammoxidation of methanol, and a process for the production of hydrogen cyanide in the presence of said improved catalyst are disclosed. This improved iron-antimony oxide catalyst is represented by the following formula:

Process for the production of hydrogen cyanide

A composition which contains as essential components: crystalline iron antimonate and at least one element selected from the group consisting of vanadium, molybdenum, and tungsten; is useful as a catalyst in the oxidation reaction of organic compounds. Also, a process for producing the composition is disclosed.

Iron-antimony-containing metal oxide catalyst composition and process

An iron-antimony-phosphorus-containing metal oxide catalyst for the catalytic oxidation, comprising a crystalline iron antimonate, the catalyst being represented by the following empirical formula:

Iron-antimony-phosphorus-containing metal oxide catalyst for oxidation

A process for preparing a metal oxide catalyst for a fluidized bed process, which comprises adjusting the pH of an aqueous slurry containing an iron compound, an antimony compound, a phosphorus compound, and a silica carrier material as essential elements, with the atomic ratio of phosphorus to antimony being at least 0.1:1, to a pH of 3 or less, spray drying the slurry, and calcining the resulting particles; which catalyst exhibits excellent activity and physical properties suitable for use in a fluidized bed process and can be obtained with good reproducibility.

Process for preparing iron-antimony-phosphorus-containing catalyst for

A phosphorus-antimony-containing catalyst for oxidation, which is obtained by calcining a metal oxide composition containing as essential components, (a) antimony, (b) at least one element selected from the group consisting of iron, cobalt, nickel, tin, uranium, chromium, copper, manganese, titanium, thorium, and cerium, and (c) silica, at a temperature ranging from 500.degree. C. to 950.degree. C. to prepare a base catalyst, impregnating the base catalyst with a solution containing a phosphorus compound so that the atomic ratio of impregnated phosphorus to antimony the base catalyst is within the range of from 0.01:1 to 2:1, drying the impregnated base catalyst, and calcining the dried product at a temperature ranging from 300.degree. C. to 850.degree. C. The catalyst exhibits satisfactory activity and strength and can be prepared with satisfactory reproducibility.

Phosphorus-antimony-containing catalyst for oxidation

A process for preparing an antimony/tellurium-containing metal oxide catalyst, comprising preparing a slurry containing an antimony compound, a polyvalent metal compound, and a silica support starting material selected from silica sol and mixtures of silica sol and white carbon, fumed silica or silica hydrogel, heating the slurry at a pH or 7 or less and a temperature of at least 40.degree. C., mixing the above heat treated slurry with a tellurium solution which has been independently prepared by oxidizing metallic tellurium with hydrogen peroxide in the presence of the oxide, oxyacid or oxyacid salt of at least one metal selected from the group consisting of vanadium, molybdenum and tungsten, and then drying and calcining the resulting mixture.

Method for preparation of antimony and tellurium-containing metal oxide

A process for producing an antimony-containing oxide catalyst supported on silica for use in a fluidized bed reaction is described, by the steps of preparing a slurry containing an antimony compound, a polyvalent metal compound, and silica sol as the essential ingredients, heat treating the slurry at a pH of 7 or less and at a temperature of 40.degree. C. or higher, and thereafter spray-drying the slurry and calcining the dried particles, wherein said silica sol has a multi-peak particle size distribution profile that is derived by using a mixture of silica sol A in an amount corresponding to form 10 to 90 wt % of the total silica in the catalyst and silica sol B in an amount corresponding to 90 to 10 wt % of the total silica in the catalyst, with silica sols A and B having different average particle sizes, provided that the relations 3&lt;da&lt;100 and 0.1&lt;da/db&lt;0.9 are satisfied by da (m.mu.), the average particle size of silica sol A, and db (m.mu.), the average particle size of silica sol B.

Process for producing antimony-containing oxide catalyst supported on

A process for the production of antimony-containing metal oxide catalysts, comprising preparing a slurry containing as essential components an antimony component, a polyvalent metal compound, and silica sol, heating and drying the slurry to form a solid product, and then calcining the solid product, wherein the antimony component is a mixture of (A) at least one of antimonic acid, polyantimonic acid and the salts thereof and (B) antimony trioxide, and is prepared by mixing (A) and (B) in such a manner that the antimony provided by the (B) constitutes from 0.1 to 70 atomic % of the total amount of antimony and further in an aqueous slurry state. These antimony-containing metal oxide catalysts have superior activity and physical properties, and further reproducibility in the preparation thereof. Thus they are useful for production of aldehydes and acids through oxidation, nitriles through ammoxidation, and dienes, unsaturated aldehydes and unsaturated acids through oxidative dehydrogenation.

Process for the production of antimony-containing metal oxide catalysts

An improved catalyst for use in the production of hydrogen cyanide by vapor phase catalytic ammoxidation of methanol, and a process for the production of hydrogen cyanide in the presence of said improved catalyst are disclosed. This improved catalyst is represented by the following empirical formula:

A process for regenerating an antimony containing metal oxide catalyst which comprises

Process for regenerating antimony containing oxide catalyst comprising

A process for producing acrylonitrile by the vapor-phase catalytic ammoxidation of propylene, which comprises (I) reacting propylene, a molecular oxygen-containing gas and ammonia in the presence of a catalyst expressed by the following empirical formula

Process for production of acrylonitrile

A process for regenerating a deteriorated antimony containing oxide catalyst comprising as essential components of (i) antimony and (ii) at least one metal element selected from the group consisting of iron, cobalt, nickel, manganese, uranium, cerium, tin and copper wherein the antimony containing oxide catalyst is impregnated or sprayed with an aqueous solution of nitric acid and/or a nitrate, and the impregnated catalyst is dried, and then calcined at a temperature in the range of from 400.degree. to 1000.degree. C.

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Kanagawa, Japan

Hiroshi Utsumi