Societe Nationale Elf Aquitaine

Societe Nationale Elf Aquitaine (production)

Elf France

Societe Nationale Elf Aquitanie (produciton)

Societe Anonyme Dite: Elf France

Jacques Maurice

Paul Maldonado

Germain Hagenbach

Romain Fouque

Jean-Louis Auriol

Pierre Tozzolino

Patrice Guesnet

Bonometti

Alain Vignau

Roland Olivier

Gerard Butte

Marc Albertini

Guy Muller

A method of determining nitrogen in various nitrogenous materials, wherein the materials are combusted by being brought into contact with a solid metallic catalytic mass, in the presence of an oxygenated gas, so as to convert the nitrogen into NO. This is then determined, preferably by chemiluminescence or by optical interferometry. The method is improved by adding a halide of an alkali metal or an alkaline earth metal to the materials prior to combustion. An apparatus comprising an oven (1,2,2') charged with catalytic mass (4), which can be a wire acting as a heating element, and provided with an oxygen inlet (6). The catalytic mass is a non-oxidizable ferrous alloy or a metal of the Pt group.

Method for the determination of total nitrogen including adding an

The invention is an improved catalytic process for removing H.sub.2 S and sulfanes from liquid sulfur and a catalyst system for carrying out the process. The catalyst comprises a basic component and a surfactant component.

Catalytic process for removal of hydrogen sulfides from liquid sulfur

A device for regulating the operation of a chemical treatment plant, by attenuation of the variances of the regulating parameters, has a calculation circuit connected to a measuring device for measuring flows of compounds at the input of the plant and measuring devices for measuring the contents of residual input compounds still present at the output of the plant. The calculation circuit performs coherence processings of the measured values to attenuate the variances of these values. The measurement provides a set-point signal which is used for the regulation of the plant.

Device for regulating the operation of a chemical treatment plant, to

Catalytic removal of hydrogen sulphide from liquid sulphur

Bitumen-polymer compositions are prepared, by mixing, at between 130.degree. C. and 230.degree. C., a bitumen with a styrene and conjugated diene copolymer and a sulphur source, the copolymer and the sulphur source being added to the bitumen either directly, or in the form of a mother solution in a hydrocarbon oil, then by maintaining the whole under stirring at between 130.degree. C. and 230.degree. C. for at least fifteen minutes. By way of sulphur source is used 0.005 to 15% by weight, with respect to bitumen, one or several polymeric or not, cyclic or linear polysulphides, and especially ditertiododecyl or dinonyl pentasulphide. The bitumen-polymer compositions obtained can be used for the obtention of superficial road coverings and present a constant quality of its properties.

Process for preparing bitumen-polymer compositions, application to these

Process of enrichment of minerals by flotation by means of a collector comprising a thio-compound, the thio-compound being a straight or branched dialkyl or dialkenyl polysulphide.

Enrichment of minerals by flotation and collector agents employed for

Process for preparing bitumen-polymer compositions, application of these

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Pau, France

Jacques Maurice