Institut Francais Du Pe'trole

Rhone-poulenc Industries

Daniel Ballerini

Norbert Kohler

Jacqueline Lecourtier

Christian Bocard

Jean-Paul Vandecasteele

Frederic Monot

Marc Baviere

Frédéric Monot

Guy Chauveteau

Michel Warzywoda

Jean Ducreux

Odile Chaude

Yves Benoit

Yann Le Penru

Nicole Monin

Jeanine Lemal

Lionel Choplin

Eric Dreveton

Jean-Paul Vandecastele

A process for producing cellulolytic and/or hemicellulolytic enzymes uses the residue from the ethanolic fermentation of enzymatic hydrolyzates of cellulosic or ligno-cellulosic materials. This process may be integrated into a process for the production of ethanol from cellulosic or ligno-cellulosic materials which comprises the following steps:

Process for the production of cellulolytic and hemicellulolytic enzymes using distillation residues from the ethanolic fermentation of enzymatic hydrolyzates of (ligno)cellulosic materials

The present invention relates to a process for controlling the permeability of the walls of the geologic formations drilled. The circulating drilling fluid includes a determined amount of gellan used as a filtrate reducer. In the process, the viscosity of the fluid is mainly controlled by polymers, such as xanthan, scleroglucan or wellan. The invention further relates to a drilling fluid including gellan.

Process using gellan as a filtrate reducer for water-based drilling

The invention relates to a decontamination process for a porous medium polluted by hydrocarbons according to a composition containing a surface active agent as glycolipids in their crude or modified form is introduced, for example by at least one input well, in the optional presence of hydrocarbon-destroying bacteria and at least one part of the composition containing at least one part of the hydrocarbons is collected, for example by a production well.

Composition containing a surface active compound and glycolipids and

Process for treating a xanthan gum in order to improve the filterability of its aqueous solutions, comprising an enzymatic treatment of an aqueous solution of xanthan gum containing, as dissolved salts, a proportion of alkali and/or alkaline-earth metals of at least 10.sup.-2 equivalent/liter, said treatment being performed by means of two enzyme extracts of different types, a so-called PG enzyme having as main activity a polygalacturonase activity and a so-called P enzyme extract whose main activity is a protease activity, in conditions compatible with the activity of said enzyme extracts. The obtained xanthan gum powder or solution can be used as enhanced oil recovery agent.

Enzymatic process for treating xanthan gums in order to improve the

A process for producing glucose dehydrogenase consists of cultivating a mutant strain (ATCC 39 118) of Bacillus megaterium in a culture medium and recovering the resultant glucose dehydrogenase. The latter can be used in the enzymatic production of L-carnitine consisting of subjecting 3-dehydrocarnitine to the simultaneous action of carnitine dehydrogenase, nicotinamide adenine dinucleotide and glucose and glucose dehydrogenase.

Production of glucose dehydrogenase and use of the resultant enzyme in

An aqueous composition is provided, suitable for direct use in waterflood oil recovery processes, which comprises the clarified fermentation fluid obtained by

Assisted oil recovery with use of fermentation fluids

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Saint Germain-en-Laye, France

Daniel Ballerini