Abstract:
A process is disclosed for preparing aromatic polyamine mixtures which contain compounds of general formula (I) H2N-A-CH2-B-NH2, in which A and B stand for 1,4-phenylene radicals which can independently bear 1 to 4 substituents selected among C1-20-alkyl radicals and halogen atoms. A compound of general formula (IV) H-A-NH-CH2-HN-B-H and/or a compound of general formula (V) H-A-NH-CH2-B-NH2, in which A and B are substituted as above, are reacted at a temperature in a range from 20 °C to 200 °C in the presence of a catalyst which is made of one or several oxides of elements of the 3rd to the 10th group of the periodic table of elements and which can be acid activated.
Abstract:
The invention relates to a method for processing at least partly deactivated polymerization catalysts for the polymerization or copolymerization of THF which are contaminated with the polymerization or copolymerization products of THF. The inventive method comprises the following steps: (a) purifying in a first step the polymerization catalyst by treating it with water vapor at a temperature of 80 to 250 DEG C and a pressure of 0.5 to 40 bar and preferably (b) regenerating the purified polymerization catalyst in a second step.
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:
Pri zpusobu výroby smesí aromatických polyaminu, které obsahují slouceniny obecného vzorce I: H.sub.2.n.N-A-CH.sub.2.n.-B-NH.sub.2.n., kde A a B jsou1,4-fenylenové zbytky, které mohou vzdy nezávislena sobe obsahovat 1 az 4 substituenty vybrané z alkylových zbytku s 1 az 20 uhlíkovými atomy a halogenových atomu, reagují slouceniny obecného vzorceIV: H-A-NH-CH.sub.2.n.-HN-B-H a/nebo slouceniny obecného vzorce V: H-A-NH-CH.sub.2.n.-B-NH.sub.2.n., pricemz A a B jsou substituovány jak je uvedeno výse, pri teplote v rozmezí od 20 do 200 .degree.Cv prítomnosti katalyzátoru, který se vybere z jednoho nebo nekolika oxidu prvku 3. az 10. skupiny periodického systému prvku, které mohou být aktivovány kyselinou.
Abstract:
Polytetrahydrofuran, tetrahydrofuran copolymers, diesters or monoesters of these polymers are prepared by polymerizing tetrahydro- furan in the presence of at least one telogen and/or comonomer on a heterogeneous carrier catalyst which contains on an oxidic carrier material as active mass a catalytically active amount of at least one oxygenous molybdenum and/or tungsten compound and, when the precursor compounds of the active mass have been applied to the carrier material precursor, has been calcined at temperatures of between 500 .degree.C and 1000 .degree.C. The catalyst used contains a promotor whic h comprises at least one element or a compound of an element of the 2nd, 3rd including the lanthanides, 5th, 6th, 7th, 8th or 14th group of the periodic system of elements.
Abstract:
Procedimiento para la obtención de éteres cíclicos e insaturados de la fórmula general I en la cual Z significa ¿(CHR4)q- o ¿(CHR4)q-O-, q significa 0, 1, 2 o 3, y R1, R2, R3 y R4 significan hidrógeno o alquilo con 1 a 4 átomos de carbono, mediante reacción de dioles de la fórmula general II en la cual tienen Z, R1, R2 y R3 los significados anteriormente indicados, en fase líquida a temperaturas desde 150 hasta 300ºC en presencia de un catalizador soportado, que contiene cobalto y que está dotado de azufre y que no está activado antes de su empleo por reducción, que contiene cobalto y un metal precioso aplicado por impregnación de sol ¿del grupo de platino, paladio, rodio, iridio, rutenio, osmio, renio o sus mezclas ¿ sobre un soporte inerte, caracterizado porque se agrega agua.
Abstract:
IN A PROCESS FOR PREPARING POLYTETRAHYDROFURAN, POLYTETRAHYDROFURAN COPOLYMERS ORDIESTERS OR MONOESTERS THEREOF BY POLYMERIZATION OF TETRAHYDROFURAN IN THE PRESENCE OF AT LEAST ONE TELGEN AND/OR COMONOMER OVER ACID- ACTIVATED MONTMORILLONITE CATALYSTS, THE MONTMORILLONITE CATALYST AFTER ACID ACTIVATION HAS A RATIO OF MONTMORILLONITE STRUCTURE TO THE SUM OF MUSCOVITE AND KAOLIN STRUCTURES, DETERMINED FROM THE INTENSITIES OF THE REFLECTIONS AT 20= 5.5o FOR MONTMORILLONITE, 20=9.0o FOR KAOLIN MEASURED IN THE X-RAY POWDER PATTERN, OF AT LEAST 5:1.
Abstract:
A process for working up at least partially deactivated polymerization catalysts for the polymerization or copolymerization of THF which are contaminated with the products of the polymerization or copolymerization of THF comprises(a) in a first step, cleaning the polymerization catalyst by treatment with steam at from 80 to 250° C. and a pressure of from 0.5 to 40 bar and, preferably,(b) in a second step, regenerating the clean polymerization catalyst.
Abstract:
A process for preparing polytetrahydrofuran, polytetrahydrofuran copolymers or diesters or monoesters of these polymers comprises polymerizing tetrahydrofuran in the presence of at least one telogen and/or comonomer over a heterogeneous catalyst comprising hectorite.