Ifp Energies Nouvelles

Institut Francais Du Pe'trole

Proteus Gmbh

Centre National De La Recherche Scientifique

Centre National De La Recherche Scientifique-Cnrs

Lionel Rousseau

Christine Dalmazzone

Antoine Margeot

Christophe Ullmann

Benjamin Herzhaft

Sebastien Fort

Cecile Persillon

Sylvie Armand

Celine Ayrinhac

Olivier Bonzom

Françoise Le Roux

Stephanie Pradeau

Thierry Palermo

Bernard Duperray

Cécile Persillon

Laurent Perier

Céline Ayrinhac

Stéphanie Pradeau

Sébastien Fort

The present invention relates to the expression and optimization of enzymes involved in the breakdown of lignocellulosic biomass. Disclosed are variants of the exoglucanase 1 of, as well as the use of said variants with improved efficiency in methods for breaking down cellulose and for producing biofuel.

Variants of exoglucanases having improved activity and uses thereof

The present invention relates to a method for determining the kinetics of gas hydrate formation in a fluid comprising water, wherein the following stages are carried out:

Method of analyzing the kinetics of gas hydrate formation in fluids

In order to determine the gas hydrate anti-agglomeration power of a system composed of an aqueous phase dispersed in a liquid hydrocarbon phase in the presence of a gas, at least two successive cycles of hydrate formation and dissociation is carried out by cooling and reheating a sample of said system placed in the cell of a calorimeter to record thermograms; the anti-agglomeration power of said system is determined by comparing the thermograms obtained during the various cycles.

Method for determining the gas hydrate anti-agglomeration power of a water/oil system

The present invention relates to a method and to a system for monitoring the evolution of the characteristics of a fluid circulating in a well ( ) for example, wherein complex dynamic viscosity measurements are performed with a suitable detector ( ) arranged on a line ( ) through which said fluid circulates, so as to obtain a law of variation of the complex dynamic viscosity &eegr;* as a function of 2&pgr;f; a rheogram of the fluid, i.e. a law of variation of the viscosity &eegr; as a function of the shear ({dot over (&ggr;)}), is deduced therefrom; Va, Vp and YV are calculated from the rheogram; these stages are repeated after a predetermined time interval; the evolution of the characteristics of the fluid is deduced from these measurements.

Continuous measurement of the rheological characteristics of well fluids

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Issou, France

Lionel Rousseau