Abstract:
The invention relates to a method for producing a mono-N-alkyl piperazine of formula (I), where R1 represents C1 - C5 alkyl or 2-(2-hydroxy-ethoxy) ethyl, by reacting diethanolamine (DEOA) of formula (II) with a primary amine of formula H 2 N-R 1 (III) in the presence of hydrogen and a catalyst moulded body. The reaction is carried out in the liquid phase at an absolute pressure ranging from 150 to 250 bar and the amination is carried out using a catalyst moulded body, the precursor of which can be produced according to a method in which (i) an oxidic material comprising copper oxide, aluminium oxide and lanthanum oxide is provided, (ii) powdered metallic copper and/or copper flakes and optionally graphite are added to the oxidic material, (iii) the mixture resulting from step (ii) is moulded into a moulded body. The oxidic material can be obtained by the simultaneous or successive precipitation of the components copper oxide, aluminium oxide and lanthanum oxide and by subsequent drying and calcination and the catalyst moulded body is calcined once again after the moulding process in step (iii).
Abstract:
The invention relates to a method for producing a mono-N-alkyl piperazine of formula (I), where R 1 represents C 1 to C 5 alkyl or 2-(2-hydroxy-ethoxy) ethyl, by reacting diethanolamine (DEOA) of formula (II) with a primary amine of formula H 2 N-R 1 (III) in the presence of hydrogen and a supported catalyst containing metal. The catalytically active mass of the catalyst, before reduction of the latter using hydrogen, contains oxygenic compounds of aluminum, copper, nickel and cobalt and between 0.2 and 5.0 wt. % oxygenic compounds of tin, calculated as SnO, and the reaction is carried out in the liquid phase at an absolute pressure ranging from 95 to 145 bar.
Abstract:
The invention relates to a method for producing a cyclic tertiary amine having the formula (I), in which A denotes a C 4 -alkylene group, a C 5 -alkylene group or a -(CH 2 ) 2 -B-(CH 2 ) 2 group, where B denotes oxygen (O) or a N-R 1 group and R 1 denotes C 1 - to C 5 -alkyl, aryl or C 5 - to C 7 -cycloalkyl, and the group R 2 denotes linear or branched C 2 - to C 16 -alkyl, C 5 - to C 7 -cycloalkyl or C 7 - to C 20 -aralkyl, by reacting (i) an amino alcohol II from the group consisting of 1,4-aminobutanol, 1,5-aminopentanol, aminodiglycol (ADG) or aminoethylethanolamine having the formula (IIa), in which R 1 is as stated above or denotes hydrogen (H), wherein in the amine I then R 1 = R 2 , with a primary or secondary alcohol R 2 OH (III) in a reactor at a temperature ranging between 150 and 270ºC in the presence of a copper-containing heterogenous catalyst in the liquid phase.
Abstract:
The present invention relates to a process for preparing unsymmetrical secondary tert-butylamines which, in addition to the tert-butyl radical, also contain an alkyl, cycloalkyl or benzyl radical. They are prepared by reacting corresponding aldehydes with tert-butylamine and hydrogen in the presence of hydrogenation catalysts (reductive amination) in the liquid phase.
Abstract:
A process for preparing N,N-dimethylaminoethoxyethanol (DMAEE), wherein a) dimethylamine and ethylene oxide are reacted, b) the resulting product mixture is separated by distillation from N,N-dimethylethanol-amine and DMAEE to obtain a DMAEE-containing fraction as a bottom stream and c) DMAEE is removed by distillation from the fraction obtained in (b).
Abstract:
A process for preparing an amine by reacting an aldehyde and/or ketone with hydrogen and a nitrogen compound selected from the group of primary and secondary amines in the presence of a heterogeneous catalyst, the catalyst being a coated catalyst which comprises at least one metal of Group VIII of the Periodic Table of the Elements as a hydrogenation metal and additionally a promoter on an oxidic support, at least 80% of the metal of Group VIII of the Periodic Table of the Elements being present in a layer between the surface of the catalyst and a penetration depth which corresponds to a maximum of 80% of the radius of the catalyst, calculated from the surface of the catalyst.
Abstract:
Verfahren zur Überwachung eines Reaktors, in dem eine chemische Mehrphasenreaktion abläuft, bei der ein Gemisch mit mindestens einer Flüssigphase und darin ungelösten Gasblasen vorhanden ist, umfassend die Schritte (a) Erfassung von Messwerten ausgewählter Zustandsgrößen, die für die Bestimmung von Gasvolumina relevant sind, (b) Berechnung des Gesamtvolumens an ungelöstem Gas im Reaktor auf Basis der erfassten Messwerte, (c) Vergleich des berechneten Gesamtvolumens an ungelöstem Gas mit einem vorgegebenen Grenzwert, und (d) Einleiten von Sicherungsmaßnahmen, falls der vorgegebene Grenzwert überschritten wird.