摘要:
The invention relates to a process for preparing β-aminopropionic acid derivatives by reacting a primary or secondary amine with an acrylic acid derivative, wherein comprises (i) a first primary or secondary amine is provided as an amine of value and reacted with the acrylic acid derivative, to obtain a reaction mixture comprising a first β-aminopropionic acid derivative as a product of value and additionally unconverted acrylic acid derivative, (ii) the unconverted acrylic acid derivative present in the reaction mixture is reacted with a second secondary amine as a scavenger amine virtually fully to give a second β-aminopropionic acid derivative to obtain a reaction mixture comprising the first β-aminopropionic acid derivative as a product of value, the second β-aminopropionic acid derivative and unconverted secondary amine.
摘要:
The invention relates to a process for preparing β-aminopropionic acid derivatives by reacting a primary or secondary amine with an acrylic acid derivative, wherein comprises (i) a first primary or secondary amine is provided as an amine of value and reacted with the acrylic acid derivative, to obtain a reaction mixture comprising a first β-aminopropionic acid derivative as a product of value and additionally unconverted acrylic acid derivative, (ii) the unconverted acrylic acid derivative present in the reaction mixture is reacted with a second secondary amine as a scavenger amine virtually fully to give a second β-aminopropionic acid derivative to obtain a reaction mixture comprising the first β-aminopropionic acid derivative as a product of value, the second β-aminopropionic acid derivative and unconverted secondary amine.
摘要:
The invention relates to a process for preparing aminoalkanamides by reacting cyanoalkanoic 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 not later than a maximum of 100 minutes after commencement of the reaction of the cyanoalkanoic ester with component a).
摘要:
Process for preparing an amine by reacting an aldehyde and/or ketone with hydrogen and a nitrogen compound selected from the group consisting of primary and secondary amines in the presence of a heterogeneous catalyst, wherein the reaction is carried out using a suspended catalyst as heterogeneous catalyst and is carried out in the semibatch mode in which the nitrogen compound as one reactant is placed in the reaction vessel and the aldehyde and/or the ketone as the other reactant is added during the course of the reaction and the aldehyde and/or the ketone is added in portions or continuously to the reaction mixture during the course of the reaction as a function of the achieved conversion of the nitrogen compound until a conversion of the nitrogen compound of at least 95% results, and all or part of the catalyst remains in the reaction vessel after the reaction batch and is reused for the next reaction batch.
摘要:
The present application relates to a process for preparing unsymmetric secondary tert-butylamines which, as well as the tert-butyl radical, also comprise an alkyl, cycloalkyl or benzyl radical. They are prepared by reacting corresponding aldehydes with tert-butylamine and hydrogen in the presence of hydrogenation catalysts (reductive amination) in the liquid phase.
摘要:
In a process for removing water by pervaporation or vapor permeation from mixtures with alcohols and/or carboxylic acids and/or carboxylic esters by bringing the mixture into contact with one side of a membrane and removing the water-containing permeate in vapor form from the other side of the membrane, the membrane used has been obtained by plasma polymerization.