Institut Francais Du Pe'trole

Raymond F Szymanski

Philippe Courty

Fabienne Le Peltier

Patrick Chaumette

Catherine Verdon

Alain Quignard

Franck Baco

A method for determining at least one physico-chemical property of a petroleum fraction is described in which a conventional analysis of the property is done for a reference petroleum sample set; each reference sample is analyzed by gas chromatography coupled with an atomic emission detector (GC-AED) to determine the distribution of an element from the group of carbon, hydrogen, sulfur, and nitrogen, as a function of the boiling points of the components of the sample, and the coefficients of the correlative model are determined from all of the data. The petroleum fraction whose property is to be determined is analyzed by chromatography under the same conditions, and the data that are obtained are multiplied by the coefficients of the model to determine the value of said property as a function of the boiling points of its components. Application to the determination of the cetane number as a function of the distillation profile of the components of the petroleum fraction.

Method for determining at least one physico-chemical property of a petroleum fraction

The present invention relates to a process for preparing a precursor of a catalyst containing copper, aluminum and zinc.

Process for preparing precursors of catalysts containing copper,

The present invention relates to a process for preparing a precursor of a catalyst containing copper, aluminum and zinc. This precursor is formed by the mixing of two ternary precursors, at different stages of their manufacturing, these two ternary precursors being different from one another in their metallic stoichiometry (atomic ratios between Cu, Zn and Al), in their crystalographic structure and in their elemental morphology. The catalyst obtained from this precursor can be used in particular for the synthesis of methanol.

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Maisons Lffitte, France

Raymond F Szymanski