Societe Nationale Elf Aquitaine (Production)

Societe Nationale Elf Aquitaine

Jean-Claude Gautier

Jacques Tellier

Bernard Tramier

Georges Sturtz

Thierry Pensec

Andre Sirvins

Andree Sirvins

Francois Lanore

Aqueous composition for the dispersion of hydrophobic substances, constituted by a microemulsion of one or more hydrocarbons, ketones and alcohols and/or glycol ethers or esters in the presence of a surfactant compound, in water, characterized in that the water has a pH of 8 to 14 and that the molar ratio of the carbonyl groups (--CO--) present to the hydrocarbon is from 0.2 to 1. Application of this composition to the removal of various paints, in particular to washing brushes; washing can be finished with water.

Aqueous composition for the dispersion of hydrophobic substances,

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

Triphosphonic ester, each of the three phosphorus atoms of which is bound to a carbon atom of the same hydrocarbon group, having 2 or 4 free acid functions or two salt functions, is prepared by reacting an alkaline-metal derivative of a phosphite diester with a diphosphonic acid tetra-ester, followed by hydrolysis of the compound obtained. The triphosphonic esters may be used for various known uses of phosphonates, including the extraction of heavy metals.

Triphosphonic esters

Triphosphonic esters, each of the three phosphorus atoms of which is bound to a carbon atom of the same hydrocarbon group, having 2 or 4 free acid functions or two salt functions, may be used for various known uses of phosphonates, including the extraction of heavy metals.

Extraction of uranium with triphosphonic esters

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

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.

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Billere, France

Jean-Claude Gautier