Celanese International Corporation

Hoechst Celanese Corporation

Other

Hoechst Aktiengesellschaft

Celanese Gmbh

Ioan Nicolau

Philip M Colling

Leland R Johnson

Tao Wang

Valery Sokolovskii

Barbara F Kimmich

Alfred Hagemeyer

David M Lowe

Yumin Liu

Jerry A Broussard

Anthony F Volpe

Karin Yaccato

Leslie E Wade

Jun Han

Adolfo Aguilo

Victor Wong

Friedrich Wunder

Gunter Roscher

Peter Wirtz

Karl-Fred Worner

Jerry D Unruh

Klaus Eichler

Debra A Ryan

Bernhard Herzog

Roland Abel

Michael A Loewenstein

Rainer Kiemel

Erich Hopf

Klaus Fichler

Azael T Flores

The present invention addresses at least four different aspects relating to catalyst structure, methods of making those catalysts and methods of using those catalysts for making alkenyl alkanoates. Separately or together in combination, the various aspects of the invention are directed at improving the production of alkenyl alkanoates and VA in particular, including reduction of by-products and improved production efficiency. A first aspect of the present invention pertains to a unique palladium/gold catalyst or pre-catalyst (optionally calcined) that includes rhodium or another metal. A second aspect pertains to a palladium/gold catalyst or pre-catalyst that is based on a layered support material where one layer of the support material is substantially free of catalytic components. A third aspect pertains to a palladium/gold catalyst or pre-catalyst on a zirconia containing support material. A fourth aspect pertains to a palladium/gold catalyst or pre-catalyst that is produced from substantially chloride free catalytic components.

Layered support material for catalysts

Halide free precurors for catalysts

Rhodium containing catalysts

The invention relates to a catalyst which contains palladium and/or compounds thereof, cadmium compounds, alkali metal compounds and at least one lanthanoid metal. The invention also relates to the utilization of the catalyst in order to produce vinyl acetate from acetic acid, ethylene and oxygen or gases containing oxygen.

Catalyst based on palladium, cadmium, alkali and lanthanoids and a method for producing vinyl acetate

A catalyst for the production of vinyl acetate by reaction of ethylene, oxygen and acetic acid comprising a porous support on the porous surfaces of which is deposited catalytically effective amounts of metallic palladium and gold, and cupric acetate. Use of this catalyst results in a reaction having a relatively low selectivity to carbon dioxide.

Vinyl acetate catalyst comprising metallic palladium and gold, and cupric acetate

Palladium, gold and boron catalyst and process for the preparation of

Synthesying vinyl acetate utilizing a catalyst for the production of vinyl acetate by reaction of ethylene, oxygen and acetic acid comprising a porous support on the porous surfaces of which is deposited metallic copper in a zone surrounded by deposits of catalytically effective amounts of metallic palladium and gold, neither of which is substantially intermingled with said copper.

Vinyl acetate production using a catalyst comprising palladium and gold

A catalyst for the production of vinyl acetate by reaction of ethylene, oxygen and acetic acid as reactants comprising a porous support on the porous surfaces of which is deposited catalytically effective amounts of metallic palladium and gold, copper as the free metal or cupric acetate, and a fourth metal selected from the group consisting of magnesium calcium, barium, and zirconium, as its oxide or mixture of oxide and free metal.

Vinyl acetate production using a catalyst comprising palladium, gold,

Vinyl acetate catalyst comprising palladium, gold, copper and any of

A method is provided to manufacture a palladium-gold catalyst by separately impregnating and fixing the palladium and gold and reducing the fixed solids to free metal on a suitable support useful for vinyl acetate manufacture from ethylene and acetic acid.

Vinyl acetate catalyst preparation method

A catalyst for the production of vinyl acetate by reaction of ethylene, oxygen and acetic acid comprising a porous support on the porous surfaces of which is deposited metallic copper in a zone surrounded by deposits of catalytically effective amounts of metallic palladium and gold, neither of which is substantially intermingled with said copper. Methods for preparing the catalyst and for synthesizing vinyl acetate utilizing the catalyst are also disclosed.

Vinyl acetate catalyst comprising palladium and gold deposited on a

Vinyl acetate catalyst comprising metallic palladium and gold and cupric

A catalyst for the production of vinyl acetate by reaction of ethylene, oxygen and acetic acid as reactants comprising a porous support on the porous surfaces of which is deposited catalytically effective amounts of metallic palladium and gold and a third metal selected from the group consisting of magnesium calcium, barium, zirconium and cerium, as its oxide or mixture of oxide and metal, said catalyst having been prepared by either of two specified methods (A) or (B). Use of the catalyst results in a reaction of relatively high activity and/or low heavy ends selectivity.

Process for preparing vinyl acetate utilizing a catalyst comprising

A catalyst particularly useful in the preparation of unsaturated esters such as the reaction of ethylene, oxygen and acetic acid in a vapor phase to form vinyl acetate. The catalyst comprises a honeycomb carrier coated with silica and containing palladium and gold throughout the silica coat. Such catalysts show reduced pressure drop and a high space time yield for vinyl acetate.

Honeycomb catalyst for vinyl acetate synthesis

A process is disclosed for the production of vinyl acetate by reaction of ethylene, oxygen and acetic acid as reactants comprising contacting said reactants and a non-halogen containing copper compound with a catalyst comprising a porous support on the porous surfaces of which is deposited catalytically effective amounts of metallic palladium, gold and copper. During the process to prepare vinyl acetate, a stream of alkali metal acetate is preferably passed over the catalyst. The process results in higher vinyl acetate selectivity and productivity due to lower CO.sub.2 selectivity during the life of the catalyst, and/or longer catalyst life.

Vinyl acetate process utilizing a palladium-gold-copper catalyst

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Corpus Christi, TX, United States of America

Ioan Nicolau