procedures for the extraction of waessrigen solutions free of neutral alpha aminosaeuren waessrigen solutions from their alkalimetallsalze.

摘要

These aqueous solutions are obtained by using two exchanger columns of equal size which are filled with a strongly acidic cation exchanges in the H+ form, connecting the outlet from the first column with the top of the second column, feeding first the solution of alkali metal salt to the top of the first column, then displacing of the residual solution diminished by the alkali metal cations adsorbed on the exchanger by feeding water into the second column, first separating off a product-free forerun at the outlet of the second column and, when free alpha -aminocarboxylic acid starts coming off in the run off from the second column, changing the receiving flask and continuing feeding water to the top of the first column until in the receiving flask a mixed pH of between 5 and 7 is reached, disconnecting and regenerating the hitherto first column, connecting the hitherto second column as from now on first column to a freshly regenerated column as the second column and repeating the entire procedure as often as desired.