Abstract:
The present invention relates to a process for dehydrogenating compounds which can be dehydrogenated, at a temperature of 150 to 400°C, in the presence of oxygen.
Abstract:
The invention relates to a method for producing aminoalkane acid amines by reacting cyanoalkane acid esters with a) ammonia or an amine and b) hydrogen in the presence of a catalyst, the reaction with component b) being started simultaneously or a maximum of 100 minutes after starting to react the cyanoalkane acid ester with component a).
Abstract:
The invention relates to a method for the hydrogenation of oligonitriles comprising at least two nitrile groups, in the presence of a catalyst, which is pre-treated by being brought into contact with a compound A prior to the hydrogenation process, said compound being selected from the following: alkaline metal carbonates, alkaline-earth metal carbonates, ammonium carbonate, alkaline metal hydrogencarbonates, alkaline-earth metal hydrogencarbonates, ammonium hydrogencarbonate, alkaline-earth metal oxocarbonates, alkaline metal carboxylates, alkaline-earth metal carboxylates, ammonium carboxylates, alkaline metal dihydrogen phosphates, alkaline-earth metal dihydrogen phosphates, alkaline metal hydrogen phosphates, alkaline-earth metal hydrogen phosphates, alkaline metal phosphates, alkaline-earth metal phosphates and ammonium phosphate, alkaline metal acetates, alkaline-earth metal acetates, ammonium acetate, alkaline metal formiates, alkaline-earth metal formiates, ammonium formiate, alkaline metal oxalates, alkaline-earth metal oxalates and ammonium oxalate.
Abstract:
The invention relates to a method for hydrogenating oligonitriles containing at least two nitrile groups in the presence of a catalyst which is pre-treat ed by being contacted with a compound A prior to the hydrogenation process, sai d compound A being selected among alkali metal carbonates, alkaline earth meta l carbonates, ammonium carbonate, alkali metal hydrogen carbonates, alkaline earth metal hydrogen carbonates, ammonium hydrogen carbonate, alkaline earth metal oxocarbonates, alkali metal carboxylates, alkaline earth metal carboxylates, ammonium carboxylates, alkali metal dihydrogen phosphates, alkaline earth metal dihydrogen phosphates, alkali metal hydrogen phosphates , alkaline earth metal hydrogen phosphates, alkali metal phosphates, alkaline earth metal phosphates and ammonium phosphate, alkali metal acetates, alkali ne earth metal acetates, ammonium acetate, alkali metal formates, alkaline eart h metal formates, ammonium formate, alkali metal oxalates, alkaline earth meta l oxalates, and ammonium oxalate.
Abstract:
The invention relates to a process for hydrogenating oligonitriles which have at least two nitrile groups in the presence of a catalyst which, before commencement of the hydrogenation, is pretreated by contacting with a compound A which is selected from alkali metal carbonates, alkaline earth metal carbonates, ammonium carbonate, alkali metal hydrogencarbonates, alkaline earth metal hydrogencarbonates, ammonium hydrogencarbonate, alkaline earth metal oxocarbonates, alkali metal carboxylates, alkaline earth metal carboxylates, ammonium carboxylates, alkali metal dihydrogenphosphates, alkaline earth metal dihydrogenphosphates, alkali metal hydrogenphosphates, alkaline earth metal hydrogenphosphates, alkali metal phosphates, alkaline earth metal phosphates and ammonium phosphate, alkali metal acetates, alkaline earth metal acetates, ammonium acetate, alkali metal formiates, alkaline earth metal formiates, ammonium formiate, alkali metal oxalates, alkaline earth metal oxalates and ammonium oxalate.
Abstract:
The present invention relates to a process for the industrial preparation of a diamine starting from a corresponding alkenyl nitrile comprising at least one C—C double bond, which comprises the steps (a) reaction of the alkenyl nitrile with a corresponding monoamine in a first reactor so that the monoamine adds exothermically onto the at least one double bond to form an aminoalkyl nitrile, with the monoamine and water being charged initially and the alkenyl nitrile being fed in; (b) evaporation of unreacted alkenyl nitrile and monoamine to increase the concentration of the aminoalkyl nitrile product in the bottoms of the first reactor; (c) transfer of the aminoalkyl nitrile bottom product from step (b) to a second reactor; (d) batchwise catalytic hydrogenation of the aminoalkyl nitrile transferred in step (c) to the diamine in the second reactor, with each batch being obtained by initially charging a catalyst suitable for the hydrogenation of nitriles to amines and also water, the desired diamine and a base, introducing hydrogen into the second reactor and feeding in the aminoalkyl nitrile transferred in step (c); and (e) isolation of the diamine and, if appropriate, repetition of the steps (a) to (e). The invention further relates to an apparatus for preparing these diamines and the use of the apparatuses. A preferred diamine is 3-dimethylaminopropylamine (DMAPA).
Abstract:
A process for selectively separating H2 S from a gas mixture which also comprises C02 is disclosed. A stream of the gas mixture is contacted with an absorbent solution comprising one or more amines, alkanolamines, hindered alkanolamines, capped alkanolamines, or mixtures thereof. The H2 S/CO2 selectivity of the absorbent solution is preferably greater than about 4.0 for an acid gas loading [mol(CO2+ H2S)/mol(amine)] between about 0.2 and about 0.6, and is achieved by reducing pH of the absorbent solution.
Abstract:
Preparation of aminoalkanoic acid amide comprises reaction of cyanoalkanoic acid ester with (a) at least a mol-equivalent of ammonia or amine, and (b) hydrogen in the presence of catalyst, at increased pressure, where optionally the formed intermediate stages are not isolated and the reaction with (b) takes place simultaneously or less than 100 minutes, after the beginning of the reaction of cyanoalkanoic acid ester with (a).
Abstract:
Hydrogenation of oligonitrile with at least two nitrile groups in the presence of a catalyst, which is pre-treated by contacting with a compound A, before the hydrogenation process; where the compound A is e.g. alkaline metal carbonates, alkaline-earth metal carbonates, ammonium carbonate, alkaline metal hydrogencarbonate, alkaline-earth metal hydrogencarbonate, ammonium hydrogencarbonate and alkaline-earth metal oxycarbonate. Hydrogenation of oligonitrile with at least two nitrile groups in the presence of a catalyst, which is pre-treated by contacting with a compound A, before the hydrogenation process; where the compound A is alkaline metal carbonates, alkaline-earth metal carbonates, ammonium carbonate, alkaline metal hydrogencarbonate, alkaline-earth metal hydrogencarbonate, ammonium hydrogencarbonate, alkaline-earth metal oxycarbonate, alkaline metal carboxylate, alkaline-earth metal carboxylate, ammonium carboxylate, alkaline metal dihydrogen phosphate, alkaline-earth metal dihydrogen phosphates, alkaline metal hydrogen phosphates, alkaline-earth metal hydrogen phosphates, alkaline metal phosphates, alkaline-earth metal phosphates, ammonium phosphate, alkaline metal acetates, alkaline-earth metal acetates, ammonium acetate, alkaline metal formate, alkaline-earth metal formate, ammonium formate, alkaline metal oxalates, alkaline-earth metal oxalates or ammonium oxalate. Independent claims are also included for: (1) an oligo amine or amino nitrile, obtained from an oligo nitrile; (2) a catalyst comprising a metal from group VIII to X, which are pretreated with the compound A, where the cobalt or nickel catalyst is pre-treated with compound A excluding alkali metal carbonate or alkali metal hydrogen carbonate; and (3) a method for preparing the catalyst comprising treating a metal form group VIII to X with the compound.