Abstract:
The present invention relates to a method for producing polyether polyols by means of catalytic ring-opening polymerization, wherein at least one cyclic precatalyst compound containing nitrogen is used.
Abstract:
The invention relates to a method for producing an alkali or earth alkali salt of an a,ß-ethylenically unsaturated carboxylic acid, wherein a) an alkene, carbon dioxide and a carboxylation catalyst is reacted to form an alkene/carbon dioxide/carboxylation catalyst adduct, b) using an auxiliary base, the adduct is decomposed into the auxiliary base salt of the a,ß-ethylenically unsaturated carboxylic acid releasing the carboxylation catalyst, c) using an alkali or earth alkali metal base, the auxiliary base salt of the a,ß-ethylenically unsaturated carboxylic acid is reacted to form the alkali or earth alkali salt of the a,ß-ethylenically unsaturated carboxylic acid releasing the auxiliary base. Salts of a,ß-ethylenically unsaturated carboxylic acids, such as in particular sodium acrylate, are required in large quantities, for example, for producing water-absorbing resins.
Abstract:
The invention relates to a method for producing olefinically unsaturated carbonyl compounds by oxidative dehydrogenation in an oxygen-containing atmosphere on a supported catalyst which contains gold and optionally additional noble metals, at temperatures in the range of 50 to 240°C.
Abstract:
The present invention relates to a process for preparing a cyclic diamine, comprising the reaction of at least one cyclic alkene with a gas mixture (G) comprising dinitrogen monoxide to give at least one cyclic ketone and the subsequent conversion of the at least one cyclic ketone to a cyclic diamine. The invention also relates to the use of a cyclic diamine with primary and secondary amine functions thus obtained to prepare polyamides and polyurethanes.
Abstract:
The invention relates to a method for producing an alkali or earth alkali salt of an a,ß-ethylenically unsaturated carboxylic acid, wherein a) an alkene, carbon dioxide and a carboxylation catalyst is reacted to form an alkene/carbon dioxide/carboxylation catalyst adduct, b) using an auxiliary base, the adduct is decomposed into the auxiliary base salt of the a,ß-ethylenically unsaturated carboxylic acid releasing the carboxylation catalyst, c) using an alkali or earth alkali metal base, the auxiliary base salt of the a,ß-ethylenically unsaturated carboxylic acid is reacted to form the alkali or earth alkali salt of the a,ß-ethylenically unsaturated carboxylic acid releasing the auxiliary base. Salts of a,ß-ethylenically unsaturated carboxylic acids, such as in particular sodium acrylate, are required in large quantities, for example, for producing water-absorbing resins.
Abstract:
La presente invención se relaciona con un proceso para llevar a cabo una reacción química en presencia de un complejo de rutenio-carbeno soportado en dióxido de silicio en un reactor operado continuamente y también al uso de catalizadores soportados de forma correspondiente en reactores operados continuamente.
Abstract:
In a process for preparing an alkalimetalor alkaline earth metal salt of an a,ß-ethylenically unsaturated carboxylic acid, a)a transition metal-alkene complex is reacted with CO2 to give a metallalactone, b)the metallalactone is reacted with a base to give an adduct of the alkalimetal or alkaline earth metal salt of the a,ß-ethylenically unsaturated carboxylic acid with the transition metal complex, and c)the adduct is reacted with an alkene to release the alkalimetalor alkaline earth metalsalt of the a,ß-ethylenically unsaturated carboxylic acid and regenerate the transition metal-alkene complex. The baseis selected from alkalimetal or alkaline earth metal hydroxides and alkali metal or alkaline earth metal superbases.The alkene is, for example, ethene. The transition metal complex comprises, for example, nickel and a bidentate P,P, P,N, P,O or P,carbene ligand, such as 1,2-bis(di-tert-butylphosphino)ethane.
Abstract:
The invention relates to a method for isomerizing olefinically unsaturated alcohols on supported noble metal catalysts comprising a carbon-based support, in an oxygen-containing atmosphere.