Societe Nationale Elf Aquitaine (production)

Societe Nationale Elf Aquitaine

Elf Aquitaine

Jacques Tellier

Jacques Komornicki

Jean-Claude Gautier

Bernard Tramier

Jean-Louis Detienne

Denise Bauer

Raymond Delourme

Robert Voirin

Andre Philippe

Henri Grangette

Anne Basseres

Claude Chambu

Jean-Francois Coste

Andre Sirvins

Pierre Mathieu

Alexandre Espert

Pascal Brochette

Andree Sirvins

A microemulsion is prepared containing: a mixture of (1) nitrogenous compounds, (2) from 10-5% by weight of an alkyl or alkenyl phosphoric ester surfactant, the alkyl and alkenyl groups of which contain less than 12 carbon atoms per group and the ester surfactant containing from 1 to 10 alkoxy radicals, (3) from 3 to 20% by weight of at least one cosurfactant, (4) a vegetable oil, an animal oil or a fatty acid and (5) a plasticizer. The microemulsion having a viscosity at 5&deg; C. less than or equal to 200 mPa&middot;sec and is stable at a temperature of &minus;10&deg; C. to &plus;50&deg; C. Further, the microemulsion is useful as a biodegradation accelerator.

Nutrient microemulsion in spray form, useful as a biodegradation accelerator

The present invention relates to a process for preparing microemulsions between an acid phase and a hydrophobic phase in which a cationic surfactant and a cosurfactant are added to the reaction medium. This process makes it possible to obtain either a microemulsion of acid-in-oil type in equilibrium with an acid phase, or a microemulsion of oil-in-acid type in equilibrium with an organic phase, or a microemulsion in simultaneous equilibrium with the organic and acid phases. The process is applicable to numerous domains: controlled acidification, stimulatiion of oil-producing well formations, fracturing, liquid-liquid extraction of metal cations in hydrometallurgy, chemical reactions (sulfonation, sulfatation, protonic catalysis).

Process for the preparation of microemulsions between an acid phase and

Process of flotation of minerals, which consists of introducing the flotation collector into the mineral pulp to be treated in the form of a microemulsifiable composition. In general, the collector agents are organic compounds containing sulphur, particularly mercaptans, thioethers or polysulphides, which generally are very slightly soluble in water. This process is particularly suitable for minerals based on oxides and sulphides.

Flotation of minerals

Liquid-liquid extraction of a substance from an aqueous solution thereof, which consists in preparing a microemulsion of this solution with a hydrophobic liquid in such a way that the layer of microemulsion is accompanied by a layer of consumed aqueous solution and a layer of hydrophobic liquid containing the substance to be extracted.

Liquid-liquid extraction with the aid of microemulsions of substances

Extraction of a metal compound from an aqueous solution by means of a hydrophobic liquid, with the production of a microemulsion; the aqueous solution has a pH of about 0.5 to 8; the surfactant employed for formation of the microemulsion is nonionic or anionic.

Process of liquid-liquid extraction of metals, with the aid of a

There is disclosed a nutrient composition to be added to a hydrophobic medium for culturing microorganisms comprising a micro-emulsion of an aqueous solution of nutrient material in a liquid immiscible with water. As the source of nitrogen, compounds soluble in water are used, such as urea or ammonium nitrate, sulphate or phosphate, and, as the source of phosphorus, compounds soluble in water are used. The medium sould also contain a directly-assimilable source of carbon. Application of this composition for culturing of microorganisms allows operations to be carried out which comprise the degrading of hydrocabons covering an area of water or ground; an application of particular interest for operation is for combatting oil pollution of the sea by biological degradation. As the source of nitrogen, compounds soluble in water are used, such as urea or ammonium nitrate, sulphate or phosphate, and, as the source of phosphorus, compounds soluble in water are used. The medium should also contain a directly-assimilable source of carbon. Application of this composition for culturing of microorganisms allows operations to be carried out which comprise the degrading of hydrocarbons covering an area of water or ground; an application of particular interest for operations is for combatting oil pollution of the sea by biological degradation.

Microemulsion of nutrient substances

Aqueous micro-emulsions of organic substances

There is described a process for the culture of microorganisms in a medium comprising a hydrophobic material containing microorganisms by the use of nutrient substances in aqueous solution micro-emulsified in a liquid immiscible with water. As the source of nitrogen, compounds soluble in water are used, such as urea or ammonium nitrate, sulphate or phosphate, and, as the source of phosphorus, compounds soluble in water are used. The medium should also contain a directly-assimilable source of carbon. Application of this process to the culture of microorganisms, allowing operations to be carried out which comprise the degrading of hydrocarbons covering an area of water or ground; an application of particular interest for operations for combatting oil pollution of the sea by biological degradation.

Process of culturing microorganisms using a microemulsion

The Claus process for the production of sulphur is improved by employing a deoxidation catalyst prior to the conventional Claus oxide catalyst.

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Lons, France

Jacques Tellier