METHOD AND DEVICE FOR SEPARATING DIACETYL-CONTAINING MIXTURES FROM METHYL ETHYL KETONE, ETHYL ACETATE, ETHANOL AND WATER, AND, WHERE APPROPRIATE, TOLUENE AND N-HEXANES

摘要

The invention relates to a process and apparatus by means of which it is possible to separate diacetyl-containing mixtures of methyl ethyl ketone, ethyl acetate, ethanol and water, and possibly toluene, isopropanol, acetic acid and hydrocarbons, in particular n-hexane, with the formation of reusable methyl ethyl ketone (containing approximately 20% by weight of ethyl acetate, at most approximately 0.5% by weight of ethanol and at most approximately 0.1% by weight of water), ethyl acetate (containing at most approximately 1% by weight of methyl ethyl ketone, at most approximately 0.5% by weight of ethanol and at most approximately 0.05% by weight of water) and ethanol (containing at most approximately 0.1% by weight of methyl ethyl ketone, at most approximately 1% by weight of water and at most approximately 1% by weight of ethyl acetate), of solvent quality, using extractive rectification and subsequent countercurrent extraction with extract recycling, which are both essentially carried out using water as an auxiliary and/or solvent. IMAGE