Institut Francais Du Pe'trole

Yves Benoit

Daniel Ballerini

Frederic Monot

Franck Haeseler

The present invention relates to a device for conditioning a soil or rock sample polluted by hydrocarbons. It also allows conditioning of pure polluting products. The device comprises a receptacle ( ) containing a soil or rock sample ( ), and an adsorbent material ( ) for adsorbing hydrocarbons or derivatives. The soil, rock or pollutant sample is preferably surrounded by two adsorbent layers. The invention also relates to a method of analysis by pyrolysis of a soil or rock sample polluted by hydrocarbons wherein the device according to the invention is used.

Device for conditioning a polluted soil-sample-method of analysis by pyrolysis

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.

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Saint Ouen l'Aumone, France

Yves Benoit