Alusuisse Italia S.p.a.

Lonza Inc.

The Lummus Company

Lummus Crest, Inc.

Giancarlo Stefani

Carlo Fumagalli

George D Suciu

Pietro Fontana

Lorenzo Capitanio

Amleto Neri

A very selective process for the catalytic air oxidation of pseudocumene to trimellitic acid. Manganese, cobalt, cerium and titanium in the presence of bromine are used as the catalyst.

Process for the preparation of trimellitic acid

Catalyst containing a vanadium/phosphorus complex oxide, for the oxidation of hydrocarbons to maleic anhydride. The catalyst contains 1 to 1.3 atoms of phosphorus per atom of vanadium. The pore volume of those pores which have a radius of 100 to 1,000 .ANG. is at least 30 percent of the total pore volume of the pores which have a radius of less than 10,000 .ANG.. The method for preparing the catalyst involves introducing a phosphorus-containing compound into an organic solvent, and continuously adding a vanadium-containing compound over the course of 0.5 to 4 hours. 1 to 1.3 atoms of phosphous is employed per atom of vanadium. The water formed during the reaction is removed continuously and directly from the reaction mixture. Thereafter the reaction mixture is separated. The V-P-O complex oxide is isolated as a solid, dried at a temperature of 90.degree. to 150.degree. C. and activated at a temperature of 200.degree. to 300.degree. C. to provide the catalyst.

Process for production of maleic anhydride

Catalyst containing a vanadium/phosphorus complex oxide, for the oxidation of hydrocarbons to maleic anhydride. The catalyst contains 1 to 1.3 atoms of phosphorus per atom of vanadium. The pore volume of those pores which have a radius of 100 to 1,000 .ANG. is at least 30 percent of the total pore volume of the pores which have a radius of less than 10,000 .ANG.. The method for preparing the catalyst involves introducing a phosphorus-containing compound into an organic solvent, and continuously adding a vanadium-containing compound over the course of 0.5 to 4 hours. 1 to 1.3 atoms of phosphorus is employed per atom of vanadium. The water formed during the reaction is removed continuously and directly from the reaction mixture. Thereafter the reaction mixture is separated. The V-P-O complex oxide is isolated as a solid, dried at a temperature of 90.degree. to 150.degree. C. and activated at a temperature of 200.degree. to 300.degree. C. to provide the catalyst.

Catalyst for oxidation reactions and process for its production

A mixed oxide catalyst precursor comprising vanadium and phosphorus treated in finely divided form with phosphoric acid and water soluble compound of aluminum and/or boron to improve resistance to attrition.

Process for making maleic anhydride

A process for oxidizing a hydrocarbon to maleic anhydride using a mixed oxide catalyst of vanadium and phosphorous prepared by a procedure including pretreating the dried catalyst precursor of the said mixed oxides in finely divided form with an acid solution.

Production of maleic anhydride

Catalysts containing mixed oxides of vanadium, phosphorus, and aluminum

Mixed oxide catalyst of vanadium and phosphorus prepared by a procedure including pretreating the dried catalyst precursor of the said mixed oxides in finely divided form with an acid solution.

Catalysts containing mixed oxides of vanadium and phosphorus

A catalyst for the preparation of phthalic anhydride is disclosed which comprises a carrier having an open arcuate configuration, e.g. in the form of half rings, and an active portion including V.sub.2 O.sub.5 and porous TiO.sub.2 with the pores having mostly a radius in the 500 to 1,500 .ANG. range. Also described is a method of preparing phthalic anhydride which utilizes this catalyst.

Catalyst for the preparation of phthalic anhydride

A catalyst for the preparation of phthalic anhydride is disclosed which comprises a carrier having an open arcuate configuration, e.g. in the form of half rings, and an active portion including V.sub.2 O.sub.5 and porous TiO.sub.2 with the pores having mostly a radius in the 500 to 1,500 A range.

Activated catalyst for oxidation reactions on the basis of mixed oxides of vanadium and phosphorus, characterized in that the vanadium has an average valence of less than +3.9. The activated catalyst is produced using a process wherein a mixed oxide, in which the vanadium has an average valence of +3.9 to more than +4, is activated at temperatures of 300.degree. to 500.degree. C. by passing over it a gaseous hydrocarbon component having 2 to 6 carbon atoms with the exclusion of molecular oxygen. The activated catalyst is used for the production of maleic anhydride from straight-chain C.sub.4 -hydrocarbons in the gaseous phase.

Process for preparing maleic anhydride

The process for the production of a mixed-oxide oxidation catalyst which, based on the vanadium and pentavalent phosphorus, has an atomic ratio of phosphorus to vanadium between 1.05 to 1 and 1.10 to 1. The process involves reacting a salt of tetravalent vanadium, dissolved in a non-oxidizing acid aqueous solution, with orthophosphoric acid. The resultant soluble vanadium salt complex, after concentrating the solution is precipitated by adding water. The precipitate is dried. The dried precipitate is put or formed into the desired form. The formed, dried precipitate is subjected to a heat treatment of at least 300.degree. C. A mixed-oxide oxidation catalyst is obtained.

Process for the production of a mixed-oxide oxidation catalyst

The process for the production of a mixed-oxide oxidation catalyst which, based on the vanadium and pentavalent phosphorus, has an atomic ratio of phosphorus to vanadium between 1.05 to 1 and 1.10 to 1. The process involves a salt of the tetravalent vanadium, dissolved in a non-oxidizing acid aqueous solution, with orthophosphoric acid. After the solution is concentrated the vanadium salt complex is precipitated by adding water. The precipitate is dried. The dried precipitate is put or formed into the desired form. The formed, dried precipitate is subjected to a heat treatment of at least 300.degree. C. A mixed-oxide oxidation catalyst is obtained.

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Bergamo, Italy

Giancarlo Stefani