Imperial Chemical Industries Limited

Percy Hayden

Richard W Clayton

Harry Pinnegar

James R Jennings

Alan F Cope

Roy John Sampson

Donald Wright

Alec Mee

Andrew J Allchurch

John R Ramforth

Christopher Buxton Spencer

Olefine oxides are produced by contacting an olefine with oxygen in the presence of a silver containing catalyst and a chlorine-containing reaction modifier; the performance of the catalyst is improved by contacting it with a nitrate or nitrite forming substance for example nitric oxide.

Production of olefine oxides

Production of ethylene oxide

Catalysts of attractive activities for use in the oxidation of ethylene to ethylene oxide comprise silver supported on a porous heat resisting support, a group VI A transition metal, potassium, rubidium and/or cesium and sulphur.

Production of ethylene oxide and catalysts therefor

Catalysts for the production of ethylene oxide

The performance of a catalyst for the oxidation of alkenes to alkylene oxides which comprises silver on alpha alumina is improved by introducing an alkali metal selected from lithium, sodium, rubidium and/or potassium to the catalyst in a ratio of one part chemically absorbed to at most three parts physically absorbed by impregnation with a solution of an alkali metal compound in a solvent which has dielectric constant of at most 8.

Process for improving the performance of a catalyst for the production

Ethylene oxide is produced by contacting ethylene and oxygen in the presence of a chlorine containing reaction modifier with a silver containing catalyst, nitropropane being also present. The nitropropane raises the selectivity of the process.

Silver containing catalysts for the oxidation of alkenes to alkylene oxides are produced by impregnating a support with a solution of a silver compound and an organic compound and decomposing the silver compound to silver in the presence of an alkali metal compound. Organic residues are then removed by washing and fresh alkali metal introduced.

Process for the preparation of a catalyst for the production of alkylene

Unsaturated mono- and saturated di-aldehydes and acetals are produced by reacting a conjugated diolefine with carbon monoxide and hydrogen in the presence of an alcohol and a catalyst comprising rhodium, a tert phosphine or phosphite and more than one equivalent of acid per gram atom of rhodium.

Process for the production of unsaturated mono- or saturated dialdehydes

Catalysts for the oxidation of alkenes to alkylene oxides comprise silver on supports having a surface area of 0.05 to 10 m.sup.2 /g, and at least 16 .mu.g equivalents per square meter of potassium together with rubidium and/or cesium.

Production of alkylene oxides and catalysts thereof

Catalysts for the oxidation of alkenes to alkylene oxides comprise silver on a support of 0.05 to 10m.sup.2 /g surface area, a promoting amount of sodium and also potassium, rubidium and/or cesium.

Catalysts for the production of alkylene oxides

The selectivity of unstable alkali metal promoted silver containing olefin oxide production catalysts is restored by wetting them.

Restoring selectivity of alkali metal promoted silver catalysts and

Alkylene oxides are produced by oxidizing olefines with oxygen in the presence of promoted silver containing catalysts.

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Guisbrough, United Kingdom

Percy Hayden