Ifp Energies Nouvelles

Institut Francais Du Pe'trole

Institute Francais Du Petrole

Institut Fracois Du Petrole

Conseil National De Recherches Du Canada

Frederic Monot

Francoise Fayolle

Caroline Aymard

Nicolas Lopes Ferreira

Remy Marchal

Fadhel Ben Chaabane

Serge R Guiot

Daniel Ballerini

Michel Warzywoda

Guillermina Hernandez

Alan Francois

Yves Benoit

Darwin Lyew

Pascal Piveteau

The present invention concerns a process for the production of an aqueous mixture comprising isopropanol, n-butanol and ethanol, comprising a step in which an aqueous solution containing C5 and/or C6 sugars and acetate is fermented under strict anaerobic conditions in the presence of a fermenting microorganism of the genusand in which said aqueous solution has an acetate concentration in the range 0.5 to 10 g/L and a ratio by weight of (acetate)/(sum of C5 and/or C6 sugars) in the range 0.005 to 0.35 g/g.

IBE fermentation method

The process for the production of cellulolytic and/or hemicellulolytic enzymes by a cellulolytic and/or hemicellulolytic microorganism according to the present invention comprises at least one phase for growth in the presence of a source of carbon and at least one phase for production in the presence of an inducing substrate, in which said inducing substrate is a mixture comprising 40% to 65% by weight of glucose or cellulosic hydrolysates, 21% to 25% by weight of lactose and 10% to 39% by weight of xylose or a solution of a lignocellulosic hemicellulosic hydrolysate, the sum of these three constituents being equal to 100%.

Process for the production of cellulolytic and/or hemicellulolytic enzymes

To reduce the concentration of methyl tert-butyl ether (MTBE) or tert-amyl methyl ether (TAME) in an aquifer polluted by these ethers, a new mineral support for fixing bacteria, and in particularI-2562, said mineral support comprising perlite, is used in a biobarrier- or biofilter-type process.

[object Object]

A process for the treatment of aqueous effluents containing at least one of the following ethers is described: ethyl tert-butyl ether (ETBE) and/or methyl tert-butyl ether (MTBE) and/or tert-amyl methyl ether (TAME) in order to reduce the concentration of these ethers. A bacteriumCIP I-2194 is innoculated under aerobic conditions. In particular, a bacteriumCIP I-2052 or a bacteriumsp. CIP I-2561 or a bacteriumsp. CIP I-2562 is added in the presence of a growth substrate and, optionally, of a cobalt salt, and the ether contained in the effluents is degraded by the bacteria thus innoculated until its mineralization. The process is useable in the ether-contaminated water treatment industry.

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

Growing community of inventors

Nanterre, France

Frederic Monot