Shell Oil Comapny

Anke Derking

Raymond Lawrence June

Donald Reinalda

Arian Van Mourik

Mohammad Azmi Bin Othman

Manfred Heinz Voetter

Wan Shi Foong

Ying Zhao

Chao-Yuan Kho

Jozef Jacobus Kaandorp

Hoi-Yan Yuen

A method of separating impurities from impure PO, the method comprising distilling impure PO in a distillation zone to provide distillate PO of enhanced purity, wherein heat is provided to the distillation zone by a bottoms reboiler and by an intermediate reboiler, the intermediate reboiler providing heat at a lower temperature than the bottoms reboiler. A suitable distillation system is also disclosed.

Relating to propylene oxide purification

A process for preparing an organic hydroperoxide, which process comprises:

Process for preparing an organic hydroperoxide, industrial set-up therefore and process wherein such organic hydroperoxide is used in the preparation of an alkylene oxide

The invention relates to a high surface area zirconia, having a surface area of above 125 m.sup.2 /g and preferably of above 200 m.sup.2 /g after calcination. The high surface area zirconia product of the invention can be prepared by mixing a zirconium salt solution with an alkali or ammonium compound, the zirconium hydroxide precipitate being aged in the presence of an oxygen acid of an element of group 5 or 6 of the Periodic Table of Elements and subsequently being calcined, optionally after a washing step. The preferred acid is phosphoric acid.

High surface area zirconia

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Amsterdam, Netherlands

Anke Derking