Abstract:
Verfahren zur Herstellung von Alkanolen (I), ausgewählt aus der Gruppe bestehend aus Isopropanol und 2-Butanol, aus den entsprechenden Alkanen (II), ausgewählt aus der Gruppe bestehend aus Propan und n-Butan, mit den Schritten: A) ein das Alkan (II) enthaltender Einsatzgasstrom a wird bereitgestellt; B) der das Alkan (II) enthaltende Einsatzgasstrom a wird in eine Dehydrierzone eingespeist und das Alkan (II) wird einer Dehydrierung zum Alken (III) unterworfen, wobei ein Produktgasstrom b enthaltend das Alken (III), nicht umgesetztes Alkan (II), gegebenenfalls Hochsieder, Wasserdampf, Wasserstoff und Leichtsieder erhalten wird; C) der Produktgasstrom b wird zumindest komprimiert, optional wird der Produktgasstrom b in eine wässrige Phase c1, eine das Alken (III), das Alkan (II) und gegebenenfalls Hochsieder enthaltende Phase c2 und eine Gasphase c3 enthaltend Wasserstoff und Leichtsieder aufgetrennt; D) der Produktgasstrom b beziehungsweise die Alken (III) und Alkan (II) enthaltende Phase c2 wird in einer Esterbildungszone mit einer Alkansäure (IV) mit 3 oder mehr Kohlenstoffatomen umgesetzt, wobei ein Produktgemisch d enthaltend den entsprechenden Alkylester (V) der Alkansäure und das nicht umgesetzte Alkan (II) erhalten wird; E) von dem Produktgemisch d wird ein Alkan (II) enthaltender Gasstrom e1 abgetrennt, der gegebenenfalls in die Dehydrierzone zurückgeführt wird, und ein den Alkylester (V) enthaltendes Produktgemisch e2 gewonnen; F) das den Alkylester (V) enthaltende Produktgemisch e2 wird in einer Esterspaltungszone mit Wasser zu einem Produktgemisch f enthaltend das Alkanol (I) und die Alkansäure (IV) umgesetzt; G) aus dem Produktgemisch f werden das Alkanol (I) und die Alkansäure (IV) abgetrennt und die Alkansäure wird gegebenenfalls in die Esterbildungszone zurückgeführt.
Abstract:
The present invention relates to a process for preparing oligo ethylene glycol methyl ether borate comprising the steps of: a) feeding boric acid and oligo ethylene glycol monomethyl ether into a reactor (10) and reacting the resulting mixture to obtain a raw product which comprises oligo ethylene glycol methyl ether borate, water and unreacted boric acid and oligo ethylene glycol monomethyl ether; b) feeding the raw product to a reactive distillation device (30) and reacting boric acid with oligo ethylene glycol monomethyl ether to full conversion of boric acid; c) transferring a distillate stream containing water from the top of the reactive distillation device (30) to a condenser (34) and recycling a condensed liquid stream to the top of the reactive distillation device (30); and d) withdrawing a bottom product stream containing oligo ethylene glycol methyl ether borate from the reactive distillation device (30), transferring part of the bottom product stream to a reboiler (33) and recycling the resulting vapor stream to the bottom section of the reactive distillation device (30).
Abstract:
Die Erfindung betrifft ein silberhaltiges Katalysatorsystem für die Herstellung von Aldehyden und/oder Ketonen durch oxidative Dehydrierung von Alkoholen, insbesondere die oxidative Dehydrierung von Methanol zu Formaldehyd, umfassend eine erste Katalysatorschicht und eine zweite Katalysatorschicht, wobei die erste Katalysatorschicht aus einem silberhaltigen Material in Form von Knäueln, Netzen oder Gestricken mit einem Flächengewicht von 0,3 bis 10 kg/m 2 und einem Drahtdurchmesser von 30 bis 200 μm besteht, und die zweite Katalysatorschicht aus einem silberhaltigen Material in Form von Granulat mit einer mittleren Partikelgröße von 0,5 bis 5 mm besteht, und die beiden Katalysatorschichten im direkten Kontakt miteinander sind. Weiter betrifft die Erfindung ein entsprechendes Verfahren zur Herstellung von Aldehyden und/oder Ketonen, insbesondere von Formaldehyd, durch oxidative Dehydrierung entsprechender Alkohole an einem silberhaltigen Katalysatorsystem.
Abstract:
The invention relates to a process for treating an alcoholic reaction mixture produced during the preparation of alkoxycarbonylaminotriazines and comprising at least one alkoxycarbonylaminotriazine, at least one cyclic and/or acyclic carbonic acid ester, at least one C1-C13-alkanol optionally containing one or two oxygen atoms as ether bond and optionally substituted by C1-C4-alkyl and/or hydroxy, and at least one alkali metal or alkaline earth metal alkoxide, optionally melamine and optionally catalyst, in which polar and/or ionic components are removed by extraction with a polar extractant that is not completely miscible with the organic phase present in the reaction mixture, giving an alcoholic phase comprising at least one alkoxycarbonylaminotriazine, and a polar phase comprising extractant with polar and/or ionic components dissolved therein.
Abstract:
A process for preparing alkanols (I) selected from the group consisting of isopropanol and 2-butanol from the corresponding alkanes (II) selected from the group consisting of propane and n-butane, comprising the steps of: A) a use gas stream a comprising the alkane (II) is provided; B) use gas stream a comprising the alkane (II) is fed into a dehydrogenation zone and the alkane (II) is subjected to a dehydrogenation to the alkene (III), to obtain a product gas stream b comprising the alkene (III), unconverted alkane (II), with or without high boilers, steam, hydrogen and low boilers; C) product gas stream b is at least compressed, and product gas stream b is optionally separated into an aqueous phase c1, a phase c2 which comprises the alkene (III) and the alkane (II), with or without high boilers, and a gas phase c3 comprising hydrogen and low boilers; D) product gas stream b or the phase c2 comprising alkene (III) and alkane (II) is reacted in an esterification zone with an organic acid (IV) to obtain a product mixture d comprising the corresponding alkyl ester (V) of the organic acid and the unconverted alkane (II); E) a gas stream e1 comprising alkane (II) is removed from the product mixture d and is optionally recycled into the dehydrogenation zone, and a product mixture e2 comprising the alkyl ester is obtained; F) product mixture e2 comprising the alkyl ester is reacted in a deesterification zone with water to give a product mixture f comprising the alkanol (I) and the organic acid (IV); G) the alkanol (I) and the organic acid (IV) are removed from the product mixture f, and the organic acid is optionally recycled into the esterification zone.
Abstract:
The invention relates to a method for producing alcohols (I), selected from isopropanol and 2-butanol, from the corresponding alkanes (II), selected from propane and n-butane, comprising the steps: A) a feed stream a, comprising the alkane (II) is prepared, B) the feed stream a, comprising the alkane (II) is introduced into a dehydrogenation zone and the alkane (II) subjected to a dehydrogenation to give the alkene (III), wherein a product gas stream b containing the alkene (III), unreacted alkane (II), optional high-boilers, steam, hydrogen and low-boilers is obtained, C) the product gas stream b is at least compressed, the product gas stream b is optionally separated into an aqueous phase c1, a phase c2, comprising the alkene (III), the alkane (II) and optionally high-boilers and a gas phase c3, comprising hydrogen and low-boilers, D) the product gas stream b and/or the phase c2, comprising the alkene (III) and alkane (II) is reacted in an esterification zone with an alkanoic acid (IV) having 3 or more carbon atoms, wherein a product mixture d, comprising the corresponding alkyl ester (V) of the alkanoic acid and the unreacted alkane (II) is obtained, E) a gas stream e1 comprising an alkane (II) is separated off from the product mixture d, optionally recycled back to the dehydrogenation zone and a product mixture e2, comprising the alkyl ester (V) is obtained; F) the product mixture e2, comprising the alkyl ester (V) is reacted with water in an ester cleavage zone to give a product mixture f containing the alcohol (I) and the alkanoic acid (IV), G) the alcohol (I) and the alkanoic acid (IV) are separated off from the product mixture f and the alkanoic acid optionally recycled to the esterification zone.
Abstract:
The invention relates to a method for removing salts from an alkanolic reaction mixture, which results during the production of alkoxycarbonyl amino triazines, contains at least one alkoxycarbonyl aminotriazine, at least one cyclic and/or acyclic carbonic ester, at least one C1-C13 alkanol optionally containing one or two oxygen atoms as an ether bond and optionally being substituted by C1-C4 alkyl and/or hydroxy, and which contains at least one alkaline or alkaline earth alkanolate, optionally melamine and, optionally, a catalyst. According to the method, salts are removed from the reaction mixture by ion exchange on a cation exchanger and/or anion exchanger.
Abstract:
The invention relates to a process for the preparation of flowable, pulverulent alkoxycarbonylaminotriazine from an alcoholic reaction mixture produced during the preparation of alkoxycarbonylaminotriazines and comprising at least one alkoxycarbonylaminotriazine, at least one cyclic and/or acyclic carbonic acid ester, at least one C1-C13-alkanol optionally containing one or two oxygen atoms as ether bond and optionally substituted by C1-C4-alkyl and/or hydroxy, and at least one alkali metal or alkaline earth metal alkoxide, optionally melamine and optionally catalyst, where the reaction mixture is atomized and dried in a spray-dryer.