Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von Ameisensäure, bei dem man durch katalytische Hydrierung von Kohlendioxid mit Wasserstoff an einem Katalysator, der ein Metall der Gruppen 8 bis 10 des Periodensystems enthält, in Gegenwart eines primären, sekundären und/oder tertiären Amins das entsprechende Ammoniumformiat erzeugt und das Ammoniumformiat durch Erhitzen in Ameisensäure und das Amin spaltet, dadurch gekennzeichnet, dass das primäre, sekundäre oder tertiäre Amin ausgewählt ist aus den Aminen der Formel I oder deren Gemischen, wobei R 1 bis R 3 gleich oder verschieden sind und Wasserstoff, lineare oder verzweigte Alkylreste mit 1 bis 18 Kohlenstoffatomen, cycloaliphatische Reste mit 5 bis 7 Kohlenstoffatomen, Arylreste und/oder Arylalkylreste bedeuten und mindestens einer der Reste R 1 bis R 3 eine Hydroxylgruppe trägt, und man die Hydrierung in einem Lösungsmittel, das bei Normaldruck einen Siedepunkt ≥105 0C aufweist, durchführt, und man die Ameisensäure in dem das hoch siedende Lösungsmittel enthaltenden Reaktionsgemisch der Hydrierung durch thermische Spaltung des Ammoniumformiats und Abdestillieren der Ameisensäure gewinnt.
Abstract:
A method for the emulsion polymerization of one or more olefins by reacting a ligand of general formulae Ia and Ib or a mixture of at least two ligands Ia or Ib, wherein R respectively represents one or several of the following radicals; hydrogen, halogen, nitrile, C1-C12-alkyl groups, C1-C12-alkoxy groups, C7-C13-aralkyl groups, C6-C14-aryl groups,and wherein identical or different compounds of general formulae Ia and Ib can, optionally, be concatenated by one or several bridges, with a phosphine compound PR3' and a metal compound of general formula M(L2)2 or M(L2)2 (L1)z,wherein the variables are defined as follows: M is a transition metal of groups 7 - 10 in the periodic system of the elements;L1 represents phosphanes (R5)xPH3-x or amines (R5)xNH3-x with identical or different radicals R5, ether (R5)2O, H2O, alkohols (R5)OH, pyridine, pyridine derivatives of formula C5H5-x(R5)xN, CO, C1-C12-alkylnitriles, C6-C14-arylnitriles or ethylenically unsaturated double bond systems, wherein x is a whole number ranging from 0 - 3, L2 represents halogenide ions R6xNH3-x, wherein x is a whole number ranging from 0 3 and R6 represents C1-C12-alkyl, and C1-C6-alkylane ions, allylane ions, benzylane ions or arylane ions, wherein L1 and L2 can be concatenated with each other by one or several covalent bonds, z is a number ranging from 0 4. The invention also relates to the immediate use of the reaction product in the polymerization or copolymerization of olefins in water or in a solvent mixture containing at least 50 vol. % water in the presence of an emulsifier and, optionally, in the presence of an activator.
Abstract:
The invention relates to a method for producing formic acid by generating the corresponding ammonium formate by means of catalytic hydrogenation of carbon dioxide with hydrogen on a catalyst comprising a metal of groups 8 through 10 of the periodic system, in the presence of a primary, secondary, and/or tertiary amine, and by cleaving the ammonium formate by heating it in formic acid and the amine, characterized in that the primary, secondary, or tertiary amine is selected from the amines of formula I or the mixtures thereof, R1 through R3 being identical or different and being hydrogen, linear or branched alkyl radicals having 1 to 18 carbon atoms, cycloaliphatic radicals having 5 to 7 carbon atoms, aryl radicals and/or aryl alkyl radicals, at least one of the radicals R1 to R3 carrying a hydroxyl group, and that said hydrogenation is performed in a solvent having a boiling point of ≥105°C at normal pressure, and that the formic acid is obtained in the hydrogenation reaction mixture comprising the high-boiling solvent by thermal cleavage of the ammonium formate and distillation of the formic acid.
Abstract:
The invention relates to a method for producing an aqueous polymer dispersion by polymerisation of at least one unsaturated compound in an aqueous medium in the presence of at least one dispersant and one solid polymerisation catalyst.
Abstract:
The invention relates to a method for producing dialdehydes and/or ethylenically unsaturated monoaldehydes by reacting at least one compound with at least two ethylenically unsaturated double bonds with carbon monoxide and hydrogen in the presence of a hydroformylating catalyst with at least one complex of a metal of subgroup VIII. The subgroup comprises at least pnicogen chelate ligands.