Abstract:
The invention concerns a process for preparing polytetrahydrofuran, copolymers of tetrahydrofuran and 2-butin-1,4-diol, diesters of these polymers with C2-C20 monocarboxylic acids or monoesters of these polymers with C1-C10 monocarboxylic acids by polymerizing tetrahydrofuran in the presence of one of the following telogens, water, 1,-4-butane diol, 2-butin-1,4-diol, polytetrahydrofuran with a molecular weight of between 200 and 700 Dalton, or of a C1-C10 monocarboxylic acid or a carboxylic acid anhydride produced from C2-C20 monocarboxylic acids or mixtures of these telogens on a heterogeneous carrier catalyst which contains a catalytically active amount of an oxygenous molybdenum and/or tungsten compound on an oxidic carrier material, and which has been calcined at temperatures of between 500 °C and 1000 °C after application of the precursor compounds of the oxygenous molybdenum and/or tungsten compounds to the carrier material precursors. Before it is used as a polymerization catalyst, the catalyst is activated by treatment with a reducing agent.
Abstract:
The invention concerns tetrahydrofuran/but-2-ine-1,4-diol copolymers containing C-C triple bonds, the copolymers having a mean molecular weight Mn of 500 to 3,500 Daltons and containing 0.5 to 3 moles of triple bonds per mole of copolymer, as well as blends of these copolymers with polytetrahydrofuran having a mean molecular weight Mn of 500 to 3,500 Daltons. The invention also concerns a method of producing such copolymers or blends and their use.
Abstract:
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 th e catalytic component, and ammonia as a solvent. The method is characterised in that a) adipodinitrile is hydrogenated at temperatures o f 70 to 220 .degree.C and at pressures of 100 to 400 bar in the presence of catalysts based on elementary iron as the catalytic component, and ammoni a as a solvent to produce a mixture containing adipodinitrile, 6-aminocapronitrile, hexamethylene diamine and high boilers, until the sum o f the 6-aminocapronitrile and adipodinitrile concentration is 1 to 50 wt. 3% 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).
Abstract:
THE DISCLOSURE IS A PROCESS FOR PREPARING CYCLIC LACTAMS OF THE FORMULA 1:WHERE R1 IS HYDROGEN, ALKYL, CYCLOALKYL OR ARYL, AND A IS C3-C12-ALKYLENE UNSUBSTITUTED OR SUBSTITUTED BY 1,2, 3, 4, 5 OR 6 SUBSTITUTUENTS SELECTED INDEPENDENTLY OF ONE ANOTHER FROM THE GROUP CONSISTING OF ALKYL, CYCLOALKYL AND ARYL, BY CONVERSION OF AN W-AMINOCARBONITRILE OF THE FORMULA 2;ER1N -A – CN WHERE R1 AND A ARE EACH AS DEFINED ABOVE, IN THE PRESENCE OF AT LEAST ONE CATALYST, WHICH COMPRISES CONVERTING SAID NITRILE II INTO AN OLIGOMER MIXTURE, AND TREATING WITH SUPERHEATED STEAM.
Abstract:
Process for the manufacture of aliphatic alpha, omega amino nitriles by partial hydrogenation of aliphatic alpha, omega dinitriles in the presence of a catalyst, characterized by the fact that a catalyst is use d for partial hydrogenation containing (a) iron or a compound based on iron or its mixtures and (b) 0.01 - 5 wt % related to (a) of a promotor o n the basis of 2,3,4 or 5 elements selected from aluminium, silicon, zirconium, titanium and vanadium and (c) 0 - 5 wt % related to (a) of a compound based on an alkali metal or alkaline earth metal.
Abstract:
MANUFACTURE OF 6-AMINOCAPRONITRILE OR 6-AMINOCAPRONITRILE/ HEXAMETHYLENEDIAMINE DIAMINE MIXTURES, INVOLVINGA)THE REACTING AT LEAST ONE PENTENENITRILE SELECTED FROM THE GROUP CONSISTING OF 2,3 AND 4-PENTENENITRILE, WITH CARBON MONOXIDE AND HYDROGEN IN THE PRESENCE OF A CATALYST, WITH CONTAIN AT LEAST ONE ELEMENT OF THE EIGHTH SUBGROUP AS ACTIVE COMPONENT ,OBTAIN A HYDROFORMYLATION FORMYLATING DISCHARGE (I), B)THE OPTIONAL SEPARATION OF CARBON MONOXIDE, HYDROGEN AND THE CATALYST FROM THE HYDROFORMYLATION FORMYLATING DISCHARGE (I), OBTAIN A HYDROFORMYLATION FORMYLATING DISCHARGE (II),C)THE SEPARATION OF 5-FORMYL VALERONITRILE FROM THE HYDROGENATION FORMYLATING DISCHARGE (I) OR (II),D)THE REACTION OF 5-FORMYL VALERONITRILE WITH AMMONIA AND HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATALYST SELECTED FROM THE GROUP CONSISTING OF RHENIUM, COPPER AND ITS COMPOUNDS AS WELL AS METALS AND METALLIC COMPOUNDS OF THE EIGHT GROUP, OBTAINING A HYDROGENATION DISCHARGE , AND E)OBTAINING 6-AMINOCAPRONITRILE AND IF NECESSARY HEXAMETHYLENE- DIAMINE .
Abstract:
PROCEDIMIENTO PARA LA OBTENCION DE TETRAHIDROFURANO MEDIANTE LA REACCION DE ETERES DE 1,4 - BUTENDIOL DE FORMULA (I) RO CH 2 - CH = CH - CH 2 - OR Y/O (II) - RO - CH SUB,2 - CH 2 = CH - CH 2 - OR, EN LAS CUALES LOS RADIC ALES R PUEDEN SER IGUALES O DIFERENTES, Y SON RADICALES DE ALQUILO DE C 1 -C 15 O CICLOALQUILO, DE RADICALES ARILO DE C 6 -C 12 O RADICALES ARALQUILO DE C 7 C 15 , CON AGUA E HIDROGENO A TEMPERATURAS DE 20 A 300° C Y A UNA PRESION DE 1 A 300 BARES EN PRESENCIA DE CATALIZADORES O COMBINACIONES CATALITICAS, QUE TAMBIEN CONTIENEN COMPONENTES, QUE SE PUEDEN HIDROGENAR, Y QUE TAMBIEN TIENEN CENTROS ACIDOS O BASICOS, ASI COMO UN NUEVO PROCEDIMIENTO PARA LA OBTENCION DE LOS ETERES DE 1,4 - BUTENDIOL DE FORMULA (I) MEDIANTE METATESIS.
Abstract:
A PROCESS FOR CATALYTIC HYDROGENATION OF ADIPONITRILE TO HEXAMETHYLENEDIAMINE AT ELEVATED TEMPERATURE AND ELEVATED PRESSURE IN THE PRESENCE OF CATALYSTS BASED ON ELEMENTAL IRON AS CATALYTICALLY ACTIVE COMPONENT AND AMMONIA AS SOLVENT COMPRISESA) HYDRO
Abstract:
In the present invention, there is disclosed a catalyst suitable for preparing aliphatic alpha, omega-aminonitriles by partial hydrogenation of aliphatic dinitriles containing: (a) metallic cobalt, a cobalt compound or a mixture thereof wherein the proportion of metallic cobalt based on (a) being from 20 to 100 percent by weight, (b) from 10 to 70 percent by weight, based on the component (a), of metallic iron, iron oxide, a further iron compound or a mixture thereof wherein the proportion of iron oxide based on the component (b) being from 20 to 100 percent by weight, and (c) from 0 to 1 percent by weight, based on the sum of the component (a) and (b), of a compound based on an alkali metal, an alkaline earth metal or zinc. Disclosed is also a process for preparing aliphatic alpha, omega-aminonitriles by partial hydrogenation of aliphatic dinitriles at elevated temperature and elevated pressure being carried out in the presence of the above-described catalyst, preferably at pressure ranging within 2 to 30 MPa and temperature in the range of 20 to 150 degC.
Abstract:
A process for preparing halogen-free, reactive polyisobutene having a terminal double bond content of more than 60 mol % and an average molecular weight Mn of 800-3000 dalton by cationic polymerization in the liquid phase of isobutene over an acidic, essentially halogen-free heterogeneous catalyst, wherea) a hydrocarbon mixture of essentially C4-hydrocarbons comprising isobutene in an amount of from 10 to 80% by weight is used as the starting material andb) polymerization is carried out continuously at from -30 to 0° C. with average starting material residence times of one hour or less, where the temperature and the residence time are selected such that the isobutene conversion is less than 60% and, after separation from the resulting polyisobutene, the isobutene is either enriched in the partially converted hydrocarbon mixture and returned to the polymerization or passed to another isobutene reaction coupled with the polymerization.