Process for the extractive removal of phospho- and sulfobetaines from acidic reaction solutions
AssigneeHoechst Aktiengesellschaft
InventorsHeribert Tetzlaff, Matthias Krull, Gernot Kremer, Christoph Porz
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Abstract
The ampholytes are extracted from the reaction solution with a liquid cation exchanger which is immiscible with the acidic aqueous reaction solution, where the cation exchanger is dissolved in at least one organic solvent which is immiscible with water and forms an organic phase with the organic solvent. Subsequently the organic phase which is loaded with the ampholyte is separated from the reaction solution, and then the ampholytes are back-extracted from the organic phase with aqueous solvents. The product losses in the process are low, and the residual salt content is very low.
Claims18
A process for the extractive removal of ampholytes based on phospho- and sulfobetaines from their acidic aqueous reaction solutions, which comprises the ampholytes being extracted from the reaction solution with a liquid cation exchanger which is immiscible with the acidic aqueous reaction solution, where the cation exchanger is dissolved in at least one organic solvent which is immiscible with water and forms an organic phase with the organic solvent, subsequently the organic phase which being loaded with the ampholyte being separated from the reaction solution, and then the ampholytes being back-extracted from the organic phase with aqueous solvents.
Dependencies are inferred from the claim text.