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Regarding composite rejection extraction, many problems have arisen.

2009-03-20View Original

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I recently read an article about using a compound composed of salt, dispersants, and chelating agents for the extraction of the methyl acetate-methanol-water ternary system; it stated that 99% of the methyl acetate could be transferred into the organic phase, thereby separating methanol from methyl acetate. I wanted to develop a process design based on this approach. Question 1: How can an extraction efficiency of 99% be achieved? Some suggest three-stage counter-current extraction (I have no idea what that entails), while others recommend using static mixers. I am also considering the direct introduction of methanol and methyl acetate in gas form (the amount of extractant used will surely need to be increased) in order to reduce condensate consumption and raise the temperature of the feed material downstream. Question 2: After the extraction, the organic phase is on top, right? It’s 99% methyl acetate; so the extractant should have moved into the aqueous phase, which contains water, methanol, and methyl acetate. How can I recover the extractant? (A weak idea is to use a tower for distillation: methanol and methyl acetate are distilled off together, while water and the chelating agent come out from the bottom of the tank, which I can then recycle.) Question three: Am I daydreaming? :lol :lol :lol :lol :lol :lol

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