Abstract: Process for producing 2-methyl-2-butene from a charge containing olefins of 5 carbon atoms, including 2-methyl-1-butene and at least one n-pentene, wherein a mixture of said charge with hydrogen and at least one sulfur compound is contacted with a supported catalyst comprising at least one noble metal from group VIII.The 2-methyl-1-butene of the charge is isomerized to 2-methyl-2-butene and the n-pentenes are hydrogenated.

Abstract: A C.sub.4 cut of high butadiene content is selectively hydrogenated in contact with a supported palladium catalyst, the operation being performed in admixture with a hydrocarbon and an amine.The C.sub.4 cut of high butadiene content (1) and liquid hydrocarbon containing the amine (6) pass through reactor (2). The resultant product is fractionated (13). The C.sub.4 cut is recovered in the vapor phase (15) and the liquid phase recycled (16).

Abstract: Acetylene is selectively hydrogenated by passing a mixture of acetylene and ethylene with a hydrocarbon liquid phase through a bed of a palladium-on-alumina catalyst. The liquid phase comprises an aromatic hydrocarbon and a primary or secondary amine.

Abstract: Process for the selective hydrogenation of the acetylenic hydrocarbons of a C.sub.4 hydrocarbons cut, containing butadiene and at least 1% by weight of acetylenic hydrocarbons, without substantial hydrogenation of butadiene, wherein said hydrocarbons cut in liquid phase and hydrogen are contacted with a supported catalyst containing 0.05 to 0.5% by weight of palladium and 0.05 to 1% by weight of silver, the Ag/Pd ratio by weight being at least 0.7.

Abstract: Process for hydrodesulfurizing and deoxygenating a gas (A) comprising methane, oxygen and at least one organic sulfur compound, said process comprising contacting a mixture of said gas (A) with a hydrogen-containing gas (B) first with a palladium-containing catalyst, at a temperature of 300.degree.-450.degree. C., and then with a second catalyst comprising molybdenum and at least one of nickel and cobalt, at a temperature of 300.degree.-450.degree. C.

Abstract: Supported palladium-gold catalyst of high resistance to poisoning by sulfur compounds, not subject to elution by vinylacetylene and not inducing a substantial formation of oligomers, for use in hydrogenation reactions wherein acetylenics and diolefins are selectively hydrogenated, said catalyst being obtained by the steps of: admixing a palladium compound with an inorganic carrier, roasting in the presence of an oxygen-containing gas, treating with a reducing agent, admixing a halogenated gold compound with the resulting composition, treating with a reducing agent, treating with a compound having a basic reaction so as to lower the halogen content of the catalyst below 10 ppm by weight, and roasting, in the presence of an oxygen-containing gas, the palladium and gold compounds being used in convenient proportions so that the catalyst contains 0.03 to 1% palladium and 0.003 to 0.3% gold by weight.

Abstract: A stabilized hydrocarbon fraction comprising toluene, xylene, sulfur and olefinic hydrocarbons is converted to benzene by (a) catalytic hydrodesulfuration, (b) hydrodealkylation and (c) catalytic hydrogenation.

Abstract: Process for hydrodesulfurizing a gas comprising together methane, at least one organic sulfur compound and oxygen, characterized by the step of passing a mixture of said gas with a hydrogen containing gas on a palladium catalyst at a temperature of 300.degree. to 450.degree. C.The gas usually comprises at least 2 mg/Nm.sup.3 of sulfur as organic sulfur and 0.05 to 2% by volume of oxygen.

Abstract: Group VIII noble metal catalysts, useful for hydrogenation, are manufactured by:(a) -impregnating a catalyst carrier with a solution of a group VIII noble metal acetylacetonate in an organic solvent, and(b) -heating the impregnated carrier in an oxygen atmosphere.

Abstract: Highly pure 1-butene and premium gasoline are obtained by(a) subjecting a C.sub.4 olefinic cut to a polymerization-disproportionation to partly convert the isobutene thereof to a gasoline which, in turn, by partial disproportionation, yields a jet fuel base and butenes,(b) fractionating the effluent from step (a) to a mixture (.alpha.) of gasoline and jet fuel base and to a fraction (.beta.) containing isobutane, n-butane, butenes, a small amount of isobutene and a minor amount of butadiene,(c) selectively polymerizing fraction (.beta.) to convert more than 90% of the isobutene thereof to gasoline,(d) fractionating the polymerized fraction (.beta.) to a gasoline cut (.gamma.) containing isobutene dimers and trimers and to a fraction (.delta.) containing isobutane, n-butane and butenes,(e) selectively hydrogenating the fraction (.delta.),(f) removing isobutane from the hydrogenated fraction (.delta.) and(g) fractionating the deisobutanized hydrogenated fraction (.delta.

Abstract: Process for selectively hydrogenating a diolefin present in a mixture of hydrocarbons having at least 4 carbon atoms per molecule: the hydrocarbon mixture is reacted with hydrogen in contact with a catalyst comprising palladium and silver, the molar ratio of hydrogen to the diolefin being from 1:1 to 5:1.

Abstract: Catalytic cracking or steam cracking effluents are desulfurized without substantial decrease of their octane number by subdividing said effluent into two fractions of different boiling ranges, the heavier of which is admixed with hydrogen, the resulting mixture being completely vaporized and fed to a hydrodesulfurization zone containing a first bed of selective catalyst formed of cobalt and molybdenum, or cobalt and tungsten, or nickel and molybdenum or nickel and tungsten deposited on a non-acid carrier, and a second bed of conventional hydrodesulfurization catalyst, the effluent from the hydrodesulfurization zone being cooled down and fractionated to separate a hydrocarbon fraction of the gasoline range which is recombined with the lighter fraction of said effluent.

Abstract: A C.sub.4 cut is upgraded according to the following steps:(a) the dried C.sub.4 cut is polymerized in the presence of fluorinated alumina, boron-alumina or silica-alumina, to convert at least 95% of isobutene to dimers and trimers, the conversion of the normal butenes being at most 3%,(b) the whole polymerization effluent is hydro-isomerized in the presence of a group VIII metal catalyst, to isomerize at least 90% of the 1-butene of said effluent,(c) the hydro-isomerization effluent is fractionated and a resultant fraction is alkylated.Resultant alkylate and mixture of dimers and trimers can be mixed and used as gasoline.

Abstract: An unsaturated C.sub.5 fraction comprising at least 10% of a mixture (A) of 2-methyl-1-butene with 2-methyl-2-butene and optionally isoprene and at least 10% of a mixture (B) of other mono-olefins and diolefins is hydrogenated under controlled conditions and thereafter etherified with an alcohol having from 1 to 4 carbon atoms. A gasoline fraction of high motor octane number and low olefin content is thus obtained.

Abstract: A C.sub.2 or C.sub.3 hydrocarbon fraction comprising at least one mono-olefinic hydrocarbon and at least one acetylenic hydrocarbon, and optionally at least one diolefinic hydrocarbon, is hydrogenated selectively in contact with a palladium-on-alumina catalyst subjected to calcining at a relatively high temperature and whose palladium crystallites have an average size of at least 50 Angstroms.

Abstract: A process is provided for selectively polymerizing isobutene in an olefinic C.sub.4 cut comprising isobutene and normal butenes by contacting the cut with a catalyst consisting essentially of silica-alumina; whereby at least 90% of the isobutene and less than 10% of the normal butenes in the cut are converted.

Abstract: Process for upgrading an olefinic C.sub.4 cut issued from a cracking or steam cracking unit, comprising subjecting said cut to isomerization conditions so as to convert at least 80% of its 1-butene content to 2-butenes, subjecting the so-treated C.sub.4 cut to polymerization conditions so as to convert at least 90% of its isobutene content to isobutene dimers and trimers without substantially converting the normal butenes, separating the isobutene dimers and trimers, alkylating the remaining fraction and fractionating the latter to an alkylate, L P G and an isobutane containing fraction.

Abstract: A C.sub.4 olefinic cracking cut is subjected first to catalytic polymerization and then to fractionation: the resultant isobutene dimers and trimers fraction is hydrogenated, while the remainder is alkylated. The resultant product is a gasoline of high isooctane content.

Abstract: Process for selectively hydrogenating acetylenic hydrocarbons such as vinylacetylene contained in an unsaturated hydrocarbon fraction such as a C.sub.4 fraction also containing a diolefinic hydrocarbon such as butadiene, without substantially hydrogenating said diolefinic hydrocarbon, comprising the step of contacting said fraction, at least partially in the liquid phase, in the presence of hydrogen, with a catalyst of palladium on alumina whose palladium crystallites have an average size of at least 50 Angstroms, said step being optionally followed with a step of contacting the resultant fraction from the preceding step, in the presence of hydrogen, with a catalyst of palladium an alumina whose palladium crystallites have an average size of at most 45 Angstroms.

Abstract: Noble metal catalyst of improved resistance to sulfur compounds, obtained by subjecting a catalyst containing a noble metal from group VIII or a compound thereof, a halogen and a carrier, to a first treatment with an inert gas such as nitrogen at 100.degree.-600.degree. C. and to a second treatment with a hydrocarbon material containing at least one sulfur compound, such as an alkyl sulfide, an alkyldisulfide or a thiophenic compound, in an inert gas atmosphere at 50.degree.-400.degree. C.