摘要:
A process for the production of at least one isomer of xylenes comprising a simulated moving-bed adsorption (8) of a C8-aromatic feedstock (1) that delivers a paraxylene-rich fraction (9) that is optionally purified after a distillation (16) by at least one high-temperature crystallization (5) and a fraction (10) that is low in paraxylene is described. Fraction (10) is distilled and then isomerized (21) in the presence of an EUO-structural-type catalyst. The lightest hydrocarbons are removed from the isomerization effluent in a first distillation (23) then naphthenes in a second distillation (26), and distilled isomerization effluent (2) that results therefrom is recycled at least in part in adsorption (8). A mother liquor (3) that results from the crystallization stage is recycled at least in part in adsorption (8).
摘要:
A composite catalyst containing:an MFI zeolite in hydrogen form, the framework containing at least one of the elements silicon, aluminium and/or gallium; a matrix; gallium; at least one noble metal of the platinum family, at least one additional metal selected from the group made up to tin, germanium, indium, copper, iron, molybdenum, gallium, thallium, gold, silver, ruthenium, chromium, tungsten and lead, and possibly a compound selected from the group made up of alkali and alkaline earth metals.Its preparation and its use in reactions for aromatising hydrocarbons containing 2 to 9 carbon atoms per molecule.
摘要:
The invention concerns a method of producing liquid hydrocarbons from natural gas, characterized in that:a) the natural gas is separated in (2) into at least two fractions, a first fraction of gas enriched with methane and a second fraction enriched with C2+ alkanesb) the methane is selectively oxidised in (7a) by molecular oxygen in the presence of a catalyst for oxidizing linkage of methanec) the fraction enriched with C2+ alkanes is at least partly mixed with the effluent from selective oxidation, when at least 80% of the molecular oxygen introduced at stage (b) has already been consumed at stage (b)d) the mixture resulting from stage (c) is pyrolysed in (7b)e) when the temperature of the mixture from stage (d) has been brought to a temperature from 300.degree. to 750.degree. C. and more particularly from 420.degree. to 550.degree. C., at least part of the olefins is converted to aromatics in (11c), in the presence of a special catalyst containing a zeolite, gallium, one or more Group VIII metals and/or rhenium, one or more additional metals selected from tin, lead, indium, germanium and thallium, possibly an alkali metal or alkaline earth metal and possibly a matrix.
摘要:
Disclosed are reactions for the aromatization of hydrocarbons containing 2 to 9 carbon atoms per molecule, with a composite catalyst containing:an MFI zeolite in hydrogen form, the framework containing at least one of the elements silicon, aluminum and/or gallium; a matrix; gallium; at least one noble metal of the platinum family, at least one additional metal selected from the group made up of tin, germanium, indium, copper, iron, molybdenum, gallium, thallium, gold, silver, ruthenium, chromium, tungsten and lead, and possibly a compound selected from the group made up of alkali and alkaline earth metals.
摘要:
The invention concerns the catalytic alkylation of at least one isoparaffin selected from the group formed by isobutane and isopentane in the presence of at least one olefin containing 3 to 6 carbon atoms per molecule, using a catalyst comprising 40% to 99% by weight of an acid selected from acids with formula R--SO.sub.3 H where R is fluorine or an alkyl group or a fluorinated alkyl group, R preferably being F or CF.sub.3, and more preferably CF.sub.3, and 1% to 60% by weight of a solvent selected from the group formed by sulpholane, dimethylsulphoxide and dioxanes, preferably sulpholane.
摘要:
Process for the production of a RON isomerate that is at least equal to 80 and that contains less than 1% by weight of aromatic compounds and for co-production of an aromatic fraction that for the most part contains toluene, starting from a fraction with 7 carbon atoms containing paraffins, aromatic compounds and naphthenes.
摘要:
The invention concerns a process for purifying sulphuric acid, particularly after it has acted as a catalyst in aliphatic alkylation reactions.It is characterized in that the sulphuric acid is impregnated into a porous organic or inorganic support, for example silica, and is then calcined at least once to eliminate organic hydrocarbon substances which the sulphuric acid may contain.
摘要:
Catalyst based on silica and sulfuric acid and its use in the catalytic alkylation of isobutane and/or isopentane in the presence of at least one olefin having 3 to 6 carbon atoms per molecule. The catalyst may contain an additive, e.g., B(OH).sub.3, HBF.sub.4, H.sub.3 PO.sub.4, FSO.sub.3 H, CF.sub.3 SO.sub.3 H, SbF.sub.5, CF.sub.3 COOH and SO.sub.3.
摘要翻译:基于二氧化硅和硫酸的催化剂及其用于在每分子具有3至6个碳原子的至少一种烯烃的存在下异丁烷和/或异戊烷的催化烷基化。 催化剂可以含有添加剂,例如B(OH)3,HBF 4,H 3 PO 4,FSO 3 H,CF 3 SO 3 H,SbF 5,CF 3 COOH和SO 3。
摘要:
A process for preparing aluminophosphate compounds (and substituted derivatives) of the structural type VFI. This preparation process is characterized in that the speed of increase in temperature of the reaction mixture is greater than 250.degree. C./hour, the total time of heating of the reaction mixture, including the rise in temperature and the plateau heating, being less than one hour. The temperature of the plateau heating is between 100.degree. and 200.degree. C.The synthetic compounds in accordance with the invention possess(a) a general formula approximating to the following:1 Al.sub.2 O.sub.3 0.75-1.25 P.sub.2 O.sub.5 0-0.5 XO.sub.n/2 0-0.05 R y H.sub.2 OwhereX represents a heteroatom chosen from the group consisting of silicon, cobalt, magnesium and zinc;n is the degree of oxidation of the heteroatom X;y, the number of water molecules contained in the said compound, is greater than 0.001; andR is an organic compound chosen from the group consisting of secondary amines, tertiary amines, and quaternary ammonium salts and hydroxides;(b) an X-ray diffraction diagram as represented in Table I of the description.
摘要翻译:制备结构型VFI的磷酸铝化合物(和取代的衍生物)的方法。 该制备方法的特征在于,反应混合物的温度升高速度大于250℃/小时,反应混合物的总加热时间(包括温度升高和平台加热)小于 一小时。 平台加热的温度为100至200℃。根据本发明的合成化合物具有(a)接近于以下的通式:1 Al 2 O 3 0.75-1.25 P 2 O 5 0-0.5 XOn / 2 0-0.05 其中X表示选自硅,钴,镁和锌的杂原子; n是杂原子X的氧化度; y,所述化合物中含有的水分子数目大于0.001; 并且R是选自仲胺,叔胺和季铵盐和氢氧化物的有机化合物; (b)如说明书的表I所示的X射线衍射图。
摘要:
The object of the invention is a synthetic crystalline zeolite of the beta type characterized by:a) the following approximate general formula:M.sub.2/n O, Al.sub.2 O.sub.3, xSiO.sub.2where M represents a proton and/or a metallic cationn is the valence of Mx is a number ranging from 5 to 800,b) an X-ray diffraction diagram represented in table I of the description, andc) a fluorine content ranging from about 0.005 to 2.0% by weight, said zeolite having been furthermore synthetized in a fluoride medium.