Abstract: The present invention relates to a process for the treatment of a hydrocarbon charge by high temperature ultrafiltration, said process comprising the steps of circulating said charge in a module comprising at least one mineral ultrafiltration barrier coated with a sensitive mineral layer of at least one metal oxide and of operating at a temperature higher than 100.degree. C. The barrier, which preferably has a ceramic or metallic support, is coated with a sensitive layer selected from the group comprising titanium dioxide, magnesium oxide, aluminium oxide, spinel MgAl.sub.2 O.sub.4, silica. The invention is applicable to the regeneration of a waste oil and to the reduction of the rate of asphaltenes in a hydrocarbon charge.

Abstract: A method of purifying a hydrogenated gas containing carbon monoxide and hydrogen sulphide, for example a gaseous mixture obtained by partial oxidation of hydrocarbons, has a hydrogen sulphide elimination step which comprises a reaction between sulphur dioxide and hydrogen sulphide to form sulphur, the reaction being carried out in a solvent for sulphur dioxide and hydrogen sulphide.

Abstract: Process, and resulting product, for improved hydroperoxidation of branched alkanes of at least 4 carbon atoms, especially useful in preparation of isoprene from isopentane; comprising the substantial elimination of acetic acid and similar by-products in the hydroperoxidation reaction which are harmful to the yield of the desired hydroperoxides; all of which is achieved by at least one washing between at least two successive oxidizing reactors. The wash solution may be just water or advantageously a pre-saturated aqueous solution containing the oxidation products which are desired not to be extracted from the organic phase of the reaction medium.

Abstract: Method for dehydrating diols into diolefins and/or olefin alcohols by contacting said diols under dehydration conditions with a catalyst prepared by forming an intimate mixture of finely divided solid particles of at least one pyrophosphate and at least one acid orthophosphate of at least one metal belonging to the group consisting of lithium, sodium, strontium, and barium into a formed mass which is thereafter calcined to transform the acid orthophosphate into pyrophosphate.

Abstract: This application is directed to a method for regenerating catalyst values used in the synthesis of a diol; the synthesis consists of a hydroperoxide reaction with an olefin in the presence of water and a molybdenum catalyst; the regenerating process consists in treating the molybdenum catalyst residue (or a fraction thereof) with ammonia -- optionally after calcining -- and causing a diol to act on the ammonium molybdate so obtained; in one embodiment ammonia in gaseous form is passed in contact with a catalyst residue (not previously calcined) which is in solution; the reaction products in the synthesis of the diol are a hydroperoxide such as tertiary hydroperoxide of isopentane and an olefin such as methyl 2-butene; the diol synthesized in 2-methyl 2,3-butanediol; it is also the synthesized diol which is preferably reacted with the ammonium molybdate.