Assignee: Societe Nationale Elf Aquitaine (FR)

Location: Not specified.
No. of patents: 36

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Number	Title	Issue Date
4861848	Polymerization of unsaturated hydrocarbons with an induction period Process of polymerization of unsaturated hydrocarbons, with an initial induction period, by means of a catalyst constituted by a halogeno-phenate of tungsten, of which the phenate group carries one or more substituents, in the presence of an organometalli...	08/29/1989
4855233	Process for carrying out enzymatic reactions in an organic solvent Process for carrying out an enzymatic reaction, in which the substrate treated is in an organic liquid which is a fluorinated hydrocarbon, which can include halogens other than fluorine....	08/08/1989
4847420	New hydroxy-thia-alkenes, and processes for their preparation and use New unsaturated alcohol-thioether, in which a double bond is located in the beta position to the S atom, in an aliphatic chain which can repeat. The compounds are generally of the formula ##STR1## In this formula, A is a branched or unbranched alipha...	07/11/1989
4837188	Catalytic systems having extended duration and conservation for the metathesis of olefins Improved catalytic systems of long active duration, comprising initially (a) a tungsten compound, (b) an organometallic compound and (c) a partially or totally fluorinated organic compound. Process of stabilization of these catalytic systems, comprising dissol...	06/06/1989
4826574	Distillation column with helical liquid flow and dissymmetric spacing of the trays A circular section column with helical liquid flow is divided by a vertical wall 10 into two gas and vapor tight sectors A and B, each sector housing a series of trays. The trays disposed are designated respectively 1a, 2a and 3a for sector A and 1b, 2b a...	05/02/1989
4827044	Process of preparation of ketones Process of preparation of ketones by the reaction of an organo-metallic compound with a compound carrying a carbonyl, within a solvent, in the presence of a manganous salt as catalyst. The manganous salt is in the form of a double salt of Mn and an alkali...	05/02/1989
4806472	Cloning and expression vector, yeast transformed by such vector and applications thereof Cloning and expression vector of a heterologous gene in a yeast, characterized in that it comprises at least; all or part of DNA of the plasmide k1 of Kluyveromyces lactis, a DNA segment incorporating the heterologous gene as well as the sequen...	02/21/1989
4767706	Fixation of enzymes with bis-dithioesters Enzymes are fixed on carriers with a bis-dithioester capable of combining with the enzyme and with the carrier. The bis-dithioester has at each of its ends a group capable of reacting with an aimine function. The enzyme may be contacted with the bis-dithi...	08/30/1988
4766195	Polymers of unsaturated alcohol thioethers Polymer or copolymer having a chain carrying terminal and/or side-chain groups: ##STR1## in which R is an H or a C2 to C12 alkyl, m is 0 to 6, n is 1 to 10 and p is 1 to 10, one, some or all of the p double bonds being satu...	08/23/1988
4734322	Process for the preparation of a glass based cellular mineral and various articles made therefrom The invention concerns a process for the preparation of a glass based cellular mineral and also the manufacture of various articles from this material. The process is characterized in that a mixture consisting of 100 parts by weight of ground glass and 0....	03/29/1988
4729888	Process of recovery of sulphur from minerals containing pyrites Production of elementary sulphur from an iron sulphide mineral, which comprises oxidizing acid lixiviation of the pulverized mineral, for extraction of the sulfur. The pulp obtained from the lixiviation is treated in the hot with an organic solvent for su...	03/08/1988
4728447	Process and product for dissolving sulfur A solvent for sulfur consisting of a dialkyl disulfide which is free of any basic substance. It is obtained from a commercial dialkyl disulfide by treatment with a reagent capable of eliminating or blocking the basic substances, particularly amines, which...	03/01/1988
4694094	Cyclic diphosphonites New organic compounds containing a phosphorus heterocycle of the phosphonite type, in which the phosphorus atom is connected on the one hand to an oxygen atom and on the other hand to an oxygen, sulphur or nitrogen atom, characterized by comprising two of...	09/15/1987
4664785	Process for distillation of petroleum by progressive separations The process consists in successively separating increasingly heavy petroleum cuts at the head of a plurality of columns CO1, CO2, CO3 and Cl0 of a first series of columns which feed individually each column of the second series. The column CO7 is a gasoli...	05/12/1987
4654462	Metathesis of olefins with a catalyst based upon a tungsten complex Improved process of metathesis of olefins by contact of one or more olefins with a catalyst comprising a tungsten complex with two phenoxy groups, carrying substituents and four other ligands, the complex carrying as coordination groups a halogen atom, an...	03/31/1987
4645648	Sealing system in a chemical apparatus between an enlosure of brittle material and metal components Improved sealing system between an enclosure of brittle material and a metal apparatus for carrying out chemical reactions, in which a connection member (6) is mounted over the open end (2') of the enclosure (2), with the interposition of a toroidal seal ...	02/24/1987
4639429	Catalyst for the metathesis of olefins Improved catalyst for the metathesis of olefins comprising a compound of W with a halogen and with a phenoxy group which can carry substituents. It contains 4 halogen atoms and 2 phenoxy groups per atom of W. Preferably, the phenoxy group is halogenated. ...	01/27/1987
4606840	Aqueous composition for the dispersion of hydrophobic substances, particularly applicable to the cleaning of objects soiled by paint or the like 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...	08/19/1986
4599180	Process of thermal stabilization of aqueous solutions of polysaccharides and its application to drilling fluids Stabilization of aqueous solutions of polysaccharides, even in the hot, by the addition of alkali metal dialkyl-dithiocarbamate and sodium chloride or calcium chloride. Applications to drilling fluids and to the improved recovery of crude oil....	07/08/1986
4595512	Process for the preparation of microemulsions between an acid phase and a hyrdophobic phase 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 mic...	06/17/1986
4587106	Liquid-liquid extraction with the aid of microemulsions of substances dissolved in water 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 so...	05/06/1986
4555343	Process of liquid-liquid extraction of metals, with the aid of a microemulsion, from an aqueous solution 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 an...	11/26/1985
4550216	Catalyst for the metathesis of olefins Improved catalyst for the metathesis of olefins comprising a compound of W with a halogen and with a phenoxy group which can carry substituents. It contains 4 halogen atoms and 2 phenoxy groups per atom of W. Preferably, the phenoxy group is halogenated. ...	10/29/1985
4540448	Microemulsion-based acid composition and its uses, particularly for cleaning operations Composition comprising a hydrophobic liquid, an aqueous acid solution, a surfactant agent and a cosurfactant, a microemulsion being formed between the hydrophobic liquid and the aqueous solution; the surfactant comprises one or more surface-active phospho...	09/10/1985
4519991	Enrichment in hydrogen sulphide of gases containing it Improvement in the enrichment of a gas in hydrogen sulphide, comprising selective absorption by a liquid in a primary absorption zone, regeneration of the liquid by heating and/or stripping by an inert gas with liberation of the gases absorbed and recover...	05/28/1985
4475941	Biocide composition comprising sulfonium compounds and organic tin compounds Process for the destruction or/and inhibition of the growth of microorganisms by means of organic derivatives of tin to which is added a sulfonium function bearing compound, with or without a solvent, to obtain a synergistic effect. Application of the pro...	10/09/1984
4465494	Microemulsion of water in a liquid fuel The present invention relates to a process for the preparation of a microemulsion of water or water and another additive, especially alcohol or amine, in a liquid fuel, in the presence of a surface active agent. Such microemulsions are intended to be used...	08/14/1984
4460038	Installation for testing a well and a process for use thereof The invention provides an installation for testing a well by pumping by means of a submerged pump and a process for use thereof. The assembly 6 formed of an hydraulic pump and motor is carried by one end of a reinforced flexible tube 1 wound through a pul...	07/17/1984
4452678	Process and apparatus for the photochemical production of halogeno-alkanes and cycloalkanes Halogenation of alkanes and of cycloalkanes by the action of ultraviolet upon a solution of the halogen in the alkane; the solution is prepared in advance and passes into the irradiated zone, after having been put into contact with a halogenation inhibito...	06/05/1984
4436658	Process of extraction of lactoferrine and immunoglobulins of milk From an aqueous medium derived from milk substantially free from caseins, proteins are extracted, particularly lactoferrine and immunoglobulins, by adsorption on a solid support. The aqueous medium is weakly basic, while elution is effected by means of an...	03/13/1984
4423635	System of analysis by visual display of the vibratory movements of a rotary machine The invention relates to a system of analysis by visual display of the vibratory movements of a rotary machine having at least one shaft supported by at least one bearing. This system comprises two first transducers transmitting electrical signals as a fu...	01/03/1984
4394320	Synthesis of stannic tetra mercaptides Process for the preparation of stannic tetra mercaptides in an economic manner through the action of corresponding mercaptans and metallic tin, at a temperature maintained between 15° C. and 200° C....	07/19/1983
4329279	Organostannic stabilizing compositions for vinyl halide resins New organostannic stabilizers for vinyl halide resins, and particularly for polyvinylchloride. These compounds can be obtained by the reaction of organostannic trihalides with mercapto alkyl esters and they can be used alone or in combination with other k...	05/11/1982
4324737	Process for the preparation of organostannic trihalides A process of preparing organostannic trihalides by reaction of an olefin compound activated by a carbonyl group adjacent to the double bond, in the presence of a hydrohalic acid, with a stannous compound in a solvent-free medium and an excess of olefin wh...	04/13/1982
4324718	Thermal stabilization of vinyl resins Thermal stabilization of halogeno-vinyl resins is achieved by the incorporation of one or more tetramercapto-tin compounds. The stabilization is improved by the addition of a crown compound, i.e. a cyclic polyether. The proportion of the crown compound is...	04/13/1982
4307028	Preparation of organo-tin compounds Preparation of organo-tin compounds, particularly mercapto-tin compounds. A metal, preferably an alkali metal, or ammonium thioxanthate is reacted with a tin salt. In a variant, the thioxanthate is produced in the reaction medium per se, starting from the...	12/22/1981

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Assignee: Societe Nationale Elf Aquitaine (FR)