The British Petroleum Company, P.l.c.

Bp Chemicals International Limited

Brian Peter Goldie

John J McCarroll

Kenneth C Kirkwood

Prem Sagar Thukral

Ronald Alfred Crump

Alan William Lightbody

A method of inhibiting corrosion of a metal surface in an aqueous system comprising introducing corrosion inhibiting cations into the aqueous system. The corrosion inhibiting cations are selected from the group comprising cations of yttrium and cations of the metals of the lanthanum series which metals have atomic numbers from 57 to 71 inclusive. The cations may be introduced in the form of water soluble salts. Alternatively the cations may be releasably bound by ion exchange to a substrate and the ion-exchanged substrate introduced into the aqueous system.

Method of inhibiting corrosion in aqueous systems

A corrosion inhibitor comprises particles of an inorganic oxide having cations of yttrium or cations of one or more metals of the lanthanide group chemically bound to the particles by ion-exchange. The cations are released by ion-exchange with other cations and not by the water solubility of the corrosion inhibitor. The corrosion inhibiting particles may be prepared by contacting particles of the inorganic oxide with an aqueous solution containing the required cations. Alternatively, the particles of the inorganic oxide may be contacted with an aqueous solution of an alkali metal so that alkali metal ions are exchanged onto the surface of the oxide and then contacting the alkali metal exchanged oxide with a solution of the required cations so that the required cations replace the alkali metal cations. The corrosion inhibiting particles may be incorporated into protective coatings e.g. paints based on epoxy resins, alkyd resins, vinyl resins or chlorinated rubbers in amounts up to 80% wt. based on the dry film weight of the coating.

Method of inhibiting corrosion using cations

Process for the production of a supported Ziegler catalyst comprising adding a halogen containing titanium compound to a fluidized bed of a magnesium-containing Ziegler support material and treating the product with an alcohol or phenol. Preferred titanium compound is titanium tetrachloride and preferred support material is magnesium oxide of the product of heating magnesium chloride with silica. The catalyst is activated using conventional Ziegler activators e.g. trialkyl aluminium.

Polymerization catalyst

Process for making a catalyst precursor by heating an inorganic oxide support with a titanium compound at a temperature in the range 150.degree. to 1200.degree. C and then retreating with titanium one or more times by alternately adding a hydroxyl compound (e.g. water) and titanium compound and heating at 150.degree. to 1200.degree. C. The precursor can be used to make a useful ethylene polymerization catalyst by adding a chromium compound and heat activating at a temperature in the range 100.degree. to 1200.degree. C.

Process for polymerizing ethylene or mixtures of ethylene with other 1-olefins by contacting the monomer with a titanium modified catalyst that has been pretreated with a hydrocarbon other than the hydrocarbon used as polymerization diluent.

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Cheam, United Kingdom

Brian Peter Goldie