Societe Nationale Elf Aquitaine

Arkema Inc.

Total Sa

Ceca S.a.

501 Societe Nationale Elf Aquitaine

Atofina

Totalenergies Se

Didier Anglerot

Jean-Louis Guth

Catherine Zivkov

Joel Patarin

Francois Delprato

Georges Fremy

Francois Fajula

Thierry Des Courieres

Thierry Aubert

Annie Commarieu

Jean-Louis Peytavy

Henri Kessler

Francois Dougnier

Serge Capdeville

Elodie Bourgeat-Lami

Beatrice Feron

Christian Forquy

Didier Tichit

Abdallah Merrouche

The invention relates to a process for the purification of a gaseous mixture containing mercaptans and other acid gases comprising a stage of bringing said gaseous mixture into contact with an absorbent solution comprising an alkanolamine, a C-Cthioalkanol and water.

Process for the purification of gaseous mixtures containing mercaptans and other acid gases

Composition intended for the flotation of ores, comprising: Process for the recovery by flotation of metal compounds of value present in ores employing it.

Composition formed of mercaptans which can be used in a process for the flotation of ores

Process for the synthesis of faujasite, having a Si/Al ratio greater than 1 and which can exceed 3, in the presence of a structuring agent consisting of at least one carbonaceous macrocycle having 10 to 24 atoms per ring and containing heteroatoms chosen from oxygen, nitrogen, sulphur or silicon, the macrocycle being introduced into the reaction medium in the form of a crude synthetic sodium complex.

Process for the synthesis of zeolites belonging to the faujasite

A process is provided for the preparation of zeolites belonging to the faujasite structural class and exhibiting a Si:Al ratio higher than 1 in which a reaction mixture is first produced, which has a pH higher than 10 and contains water, a source of tetravalent silicon, a source of trivalent aluminum, a source of hydroxide ions in the form of a strong inorganic or organic base and a structuring agent ST so as to produce an aluminosilicate gel having the desired composition to permit its crystallization into a compound of the faujasite structural class. The gel obtained is kept at a temperature, pressure and for a sufficient period to effect the crystallization of the gel into a precursor of the zeolite consisting of the zeolite trapping the structuring agent ST in its cavities and the precursor is then subjected to a calcination to destroy the structuring agent and to produce the zeolite. The structuring agent ST consists of at least one compound belonging to the group formed by the carbon-containing macrorings and macropolyrings which contain in the rings heteroatoms chosen from oxygen, nitrogen, silicon and sulphur, and which contain 10 to 24 atoms per ring. Precursors of the zeolites are also provided.

Synthesis of zeolites of faujasite structure

An aluminosilicate gel containing a structuring agent ST and having a composition appropriate for crystallizing as a zeolite of the faujasite structural family is prepared and then subjected to a crystallization to form a zeolite precursor consisting of the said zeolite containing the structuring agent ST in its cavities and channels, and zeolite is produced by calcination of the said precursor. The structuring agent ST consists of at least one compound chosen from the polyalkylene oxides of the formula ##STR1## in which R and R', which are identical or different, each represent H or a C.sub.1 to C.sub.4 alkyl radical, X denotes H or OH, m is equal to 2 or 3 and may be different from one unit to the next and n is a number larger than 12 and preferably between 25 and 800. The zeolites obtained have a Si:Al ratio which is larger than 1 and may exceed 3 and they have a cubic symmetry. These zeolites are usable, directly or after cation exchange, as adsorbents or as catalyst components.

Process for the synthesis of zeolites having an aluminosilicate

A process is provided for dealuminization of zeolites having large pores, the diameter of the aperture of the pores being greater than or equal to about 0.7 nm and the silica/alumina ratio greater than or equal to about 6. The process comprises acid leaching of the raw zeolite containing the structuring agent. The dealuminized zeolites obtained are useful as catalysts for the transformation of hydrocarbons and as selective organophilic adsorbents.

Process for dealuminization of the synthetic zeolites of large pores,

The process comprises bringing into contact a naturally alcoholic beer with a hydrophobic zeolite, separating the aqueous eluent phase from the adsorbent, thermally desorbing the adsorbed products, recovering the desorbed phase and separating it by distillation into an alcoholate and an aromatized phase, then reconstituting an alcohol-free beer by mixing the dealcoholized aqueous phase and the aromatized phase with, secondarily, saturation of the reconstituted beer with gaseous carbon dioxide. The reconstituted beer preserves the organoleptic properties of the initial beer.

Process of making alcohol-free beer and beer aroma concentrates

This invention relates to a crystalline synthetic microporous solid containing gallium and phosphorus, whose crystal structure is of the LTA type. After calcination at a temperature above 200.degree. C. the solid obtained can be employed as a catalyst for converting hydrocarbons or as an adsorbent.

Synthetic microporous solids containing gallium and phosphorous, their

Process for the preparation of a catalyst capable of promoting the

Production of elementary sulphur from an iron sulphide mineral, which comprises oxidizing acid lixiviation of the pulverized mineral, for extraction of the sulfur. The pulp obtained from the lixiviation is treated in the hot with an organic solvent for sulphur, the solvent having a density higher than 1, to separate this pulp into an aqueous phase containing in solution the non-ferrous metals, the sulphates of which are water soluble, and into a suspension of the solid of the pulp in an organic phase consisting of a solution of sulphur in the solvent separated by decantation and, after separation of the solid in suspension in the organic phase, the sulphur is recovered by crystallization after cooling of the organic phase.

Process of recovery of sulphur from minerals containing pyrites

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Didier Anglerot