2212-32-0Relevant articles and documents
Preparation method of N, N, N'-trimethyl-N'-ethoxyl-ethanediamine
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Paragraph 0040-0064, (2017/07/19)
The invention discloses a preparation method of N, N, N'-trimethyl-N'-ethoxyl-ethanediamine. The preparation method comprises the following steps: adding hydroxyethyl ethylenediamine and paraformaldehyde to a vessel, and dropwise adding formic acid in stirring, wherein the molar ratio of hydroxyethyl ethylenediamine to paraformaldehyde to formic acid is 1: (3-3.3): (3-3.3), and the reaction is carried out for 1 to 2 hours at the temperature of 50 to 110 DEG C; performing pressure-reduction steaming to obtain water generated in the reaction after the reaction is finished, so as to obtain reacting liquid; adding alcohols substances to the obtained reacting liquid to perform an ester exchange reaction so as to obtain purified reacting liquid; and performing pressure-reduction distilling on the obtained reacting liquid so as to separate out the alcohols substance and N, N, N'-trimethyl-N'-ethoxyl-ethanediamine, wherein the alcohols substances are recycled.
A simple HPLC-UV method for the determination of dimenhydrinate and related substances - Identification of an unknown impurity
Doege, Ulrica,Eger
, p. 174 - 178 (2008/02/01)
During the revision of the dimenhydrinate monograph of the European Pharmacopoeia a HPLC-UV method was developed. The procedure described allows a qualitative and quantitative determination of both dimenhydrinate compounds and of thirteen related substances. Furthermore a hitherto unknown impurity was identified and integrated into the purity check. Also 18 samples of dimenhydrinate have been tested. Thereby the relevant impurities of dimenhydrinate could be nominated and quantified.
Process for converting heat stable amine salts to heat regenerable amine salts
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, (2008/06/13)
Processes are disclosed for converting heat stable amine salts to heat regenerable amine salts using a modified electrodialysis zone (140). The processes of the present invention can be used to reduce the level of heat stable salts in a lean solvent stream in an acid gas removal process and can be integrated with the acid gas removal process to utilize process streams as a source of ions.