摘要:
The present invention relates to new metal compounds, to a process for the preparation of these metal compounds and to their use as catalysts.The new metal compounds according to the invention have, when they are used as catalysts, in particular as hydrogenation catalysts, an efficiency of the same order as that obtained with Raney nickel or cobalt.These metal compounds are more precisely compounds containing one or a number of divalent metals at least partially in the reduced state, bulked by a phase comprising one or a number of doping metals chosen from chromium, molybdenum, iron, manganese, titanium, vanadium, gallium, indium, bismuth, yttrium, cerium, lanthanum and the other trivalent lanthanides, in the form of oxides.
摘要:
Halonitroaromatic compounds, e.g., 3-chloro-4-fluoronitrobenzene, are selectively hydrogenated into the corresponding haloaromatic amines, in the essential absence of hydrodehalogenation, by reacting same with hydrogen in the presence of a catalytically effective amount of a novel Raney-type catalyst composition consisting essentially of an alloy of nickel, aluminum and molybdenum, Ni/Al/Mo, the Al/Mo ratio by weight thereof being equal to or greater than 1.
摘要翻译:通过在催化有效量的新型阮内型催化剂组合物的存在下,使氢卤素化合物,例如3-氯-4-氟硝基苯,在基本不存在加氢脱卤的情况下,通过与氢反应,选择性氢化成相应的卤代芳族胺 基本上由镍,铝和钼的合金,Ni / Al / Mo组成,Al / Mo的重量比等于或大于1。
摘要:
A process for the preparation of amino halogeno aromatic compounds, according to which a halogenonitro-aromatic compound is brought into the presence of a nickel-, cobalt- or iron-based catalyst, preferably nickel-based, and, more preferably, Raney nickel, in the presence of an effective amount of iodide, at a temperature and hydrogen pressure sufficient to form said halogenoamino-aromatic compound.
摘要:
Process for the selective preparation of meta-chloroanilines.It is carried out by the hydrodechlorination of polychloroanilines or polychloronitrobenzenes with hydrogen, in the liquid phase, under the action of heat, at atmospheric pressure or under pressure, in the presence of a noble metal, in an anhydrous organic medium and in the presence of a Lewis acid.These meta-chloroanilines are intermediates especially for active plant-protection substances.
摘要:
The present invention relates to the field of the catalytic reduction of nitriles to amines by use of Raney catalysts doped with one or a number of additional metal elements chosen from the elements of group IVb of the periodic classification. More precisely, it relates to a process for the hydrogenation of nitriles to amines, characterized in that it essentially consists: in selecting a liquid reaction medium which dissolves the nitrile substrate to be hydrogenated, in using at least one inorganic alkali metal or alkaline-earth metal hydroxide base, and in adopting a catalyst whose doping element/Ni ratio by weight is between 0.05 and 10%. More specific application to the hydrogenation of dinitriles to diamines or to aminonitriles.
摘要:
Unsaturated alcohols are prepared by hydrogenation of the corresponding carbonyl compounds in the presence of a platinum-cobalt bi-metallic catalyst having an alloy structure.
摘要:
Meta-chlorophenols useful as intermediates in various organic syntheses are prepared by selectively catalytically hydrodechlorinating a polychlorophenol in liquid phase in an acid solvent medium which is at least partially aqueous, in the presence of a Group VIII noble metal catalyst and at least one Group 1b to 5a heavy metal, said polychlorophenol bearing chlorine substituents in both the meta- and ortho- and/or para-positions.
摘要:
Meta-chlorophenols useful as intermediates in various organic syntheses are prepared by selectively catalytically hydrodechlorinating a polychlorophenol in liquid phase in an acid solvent medium which is at least partially aqueous and which comprises halide ions, in the presence of a Group VIII noble metal catalyst, said polychlorophenol bearing chlorine substituents in both the meta- and ortho- and/or para-positions.
摘要:
The invention relates to a method of doping a Raney nickel catalyst doped with metals by the incorporation of the doping metals in the form of a complex into the alkaline attack medium. Also disclosed is a process for the hydrogenation of nitriles to amines using said catalyst.
摘要:
The present invention relates to the field of the catalytic hydrogenation of nitrites to amines and, more particularly, of dinitriles such as adiponitrile (ADN) to diamines such as hexamethylenediamine (HMD). More precisely, the present invention relates to a process for the preparation of a catalyst for the hydrogenation of nitriles to amines of Raney nickel type doped with at least one additional metal element selected from columns IVb, Vb and VIb of the periodic classification. It is targeted at providing an economic and easy-to-implement process which makes it possible to obtain catalysts which are both active and selective with respect to nitrites and stable. The process is characterized in that it consists in suspending Raney nickel in a solution, preferably an acid solution, of the additional metal element.