Treatment of DMAPA wastewater after betaine synthesis
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This post was last edited by lkbiandou on 2016-2-23 09:17. In betaine production, the amount of the reactant DMAPA is increased in order to improve the conversion rate. After the reaction is complete, the aqueous solution of DMAPA is evaporated. The question is, what to do with the DMAPA aqueous solution obtained through distillation? This DMAPA wastewater solution contains 20–40% DMAPA, 60–80% water, 0.1–0.3% fatty acids, and 0.1–0.3% alkylamide propyl dimethyl tertiary amine. I was wondering, are there any good methods for dealing with low-concentration wastewater? The premise is to save money. ( ) First, thank you all!
DMAPA has a lower boiling point than water, so distillation can be considered for concentration.
These are inseparable. Gave up. Thinking of other ways
It will dissolve in water, forming an azeotrope-like mixture with water. Moreover, the boiling point of DMAPA is higher than that of water, at 134°C.
Op, could you consider using extraction to remove DMAPA from water, and see if there are suitable extractants?
Extraction is under consideration; the key is to find a cheap extractant
Things that are both economical and effective at solving problems are hard to find; you might want to check if there are any relevant studies available. Extraction agents aren’t cheap either these days. . . . . . . . .
There is another method that does not require an extractant. Variable pressure distillation is considered, using different boiling points and azeotrope compositions at various pressures to achieve separation.