摘要:
The invention relates to a method for regenerating a zeolite catalyst, comprising the thermal treatment of the catalyst in the presence of a gas stream at temperatures above 120 °C, said gas stream containing hydrogen. The regenerated zeolite catalyst can be used in an integrated method for oxidising an alkene using a hydroperoxide.
摘要:
The invention relates to a method for the production of propylene oxide, whereby (i) propylene is reacted with hydrogen peroxide in the presence of methanol to form propylene oxide, resulting in a mixture (Gi), comprising propylene oxide, methanol, water and unreacted hydrogen peroxide, (ii) from mixture (Gi) a mixture (Gii), comprising methanol, water and hydrogen peroxide is separated off, yielding a mixture (Ga), comprising propylene oxide. Water is separated off from mixture (Gii) to give a mixture (Giii), comprising methanol and methyl formate.
摘要:
The invention concerns a method for reacting an organic compound with a hydroperoxide using at least a heterogeneous catalyst. Said method is characterised in that the pH and the temperature of the reaction medium are modified during the reaction.
摘要:
The invention concerns a process for simultaneously preparing 6-aminocapronitrile and hexamethylene diamine proceeding from adipodinitrile. The process is characterized in that: (1) adipodinitrile is partially hydrogenated in the presence of a catalyst in order to obtain a mixture containing 6-aminocapronitrile, hexamethylene diamine and adipodinitrile; (2) 6-aminocapronitrile and hexamethylene diamine are separated from the mixture; (3) between 0.01 and 10 wt %, relative to adipodinitrile, of an acid or an acidic ion exchanger is added to the part substantially containing adipodinitrile, and the adipodinitrile is separated from the mixture; and (4) the adipodinitrile is returned to step (1).
摘要:
The invention relates to a method for producing aliphatic alpha-, omega-diamines by hydrogenating aliphatic alpha-, omega-dinitriles in the presence of a catalyst, characterised in that the catalyst used for the hydrogenation contains a) iron or a compound based on iron or mixtures thereof, b) 0.001 to 0.3 wt. % in relation to a) of a promoter based on 2, 3, 4 or 5 elements from the following group: aluminium, silicon, zirconium, titanium and vanadium and c) 0 to 0.3 wt. % in relation to a) of a compound based on an alkaline and/or alkaline earth metal.
摘要:
Process for the separation of 2-aminomethylcyclopentylamine from a mixture containing hexamethyldiamine and 2-aminomethylcyclopentylamine, characterized by the fact that the separation is carried out by means of distillation at a pressure of 1-300 mbars.
摘要:
The invention relates to a method for separating by distillation 6-aminocaproic acid nitrile from mixtures (I) containing 6-aminocaproic acid nitrile and an imine (II). Said method is characterized in that distillation takes place in a distillation column and that the distillation mixture remains on at least one level of the distillation column for an average period of at least 5 minutes.
摘要:
The invention relates to a method for the catalytic hydrogenation of adipodinitrile to hexamethylene diamine at a high temperature and at high pressure in the presence of catalysts based on elementary iron as the catalytic component, and ammonia as a solvent. The method is characterised in that a) adipodinitrile is hydrogenated at temperatures of 70 to 220 °C and at pressures of 100 to 400 bar in the presence of catalysts based on elementary iron as the catalytic component, and ammonia as a solvent to produce a mixture containing adipodinitrile, 6-aminocapronitrile, hexamethylene diamine and high boilers, until the sum of the 6-aminocapronitrile and adipodinitrile concentration is 1 to 50 wt. % in relation to the ammonia-free hydrogenation mixture; b) ammonia is separated out of the hydrogenation discharge; c) hexamethylene diamine is separated out of the remaining mixture; d) 6-aminocapronitrile and adipodinitrile are separated from the high boilers together or separately and e) 6-aminocapronitrile, adipodinitrile or their mixtures are returned to step a).
摘要:
The invention relates to a method for simultaneous preparation of 6-aminocapronitrile and hexamethylene diamine from adipodinitrile, comprising the following steps: a) hydrogenating adipodinitrile in the presence of a catalyst containing an element of the eight subgroup as catalytically active component to obtain a mixture containing 6-aminocapronitrile, hexamethylene diamine, adipodinitrile and high boilers; b) separating by distillation hexamethylene diamine from the mixture containing 6-aminocapronitrile, hexamethylene diamine, adipodinitrile and high boilers and c1) separating by distillation 6-aminocapronitrile and subsequently d1) separating by distillation adipodinitrile or c2) simultaneously separating by distillation 6-aminocapronitrile and adipodinitrile into separate fractions. The method is characterized in that the temperature of the bottom in steps d1) or c2) is below 185 ° C.