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1. (WO2018219560) METHOD AND DEVICE FOR PURIFYING ACETONE/WATER MIXTURES BY MEANS OF DOUBLE-EFFECT DISTILLATION

Pub. No.:    WO/2018/219560    International Application No.:    PCT/EP2018/060734
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Fri Apr 27 01:59:59 CEST 2018
IPC: C07C 49/08
C07C 45/82
B01D 3/14
Applicants: RHODIA ACETOW GMBH
Inventors: HUMMEL, Andreas
KRUMREY, Thomas
Title: METHOD AND DEVICE FOR PURIFYING ACETONE/WATER MIXTURES BY MEANS OF DOUBLE-EFFECT DISTILLATION
Abstract:
The invention relates to a method for separating acetone from acetone/water mixtures, according to which a partial flow of the acetone/water mixture is concentrated in a column operating under positive pressure in order to obtain a product with an acetone concentration of at least 80 wt. %, and a partial flow of the acetone/water mixture is concentrated in a column operating under normal pressure. The top product from the column operated under positive pressure is used to heat the bottom product of the column operated under normal pressure, by means of a heat exchanger, and the top product is then introduced into the column operated under normal pressure, above the supply of the partial flow of the acetone/water mixture. This method allows the specific energy demand for acetone separation to be significantly reduced, thereby presenting considerable cost advantages. The invention also relates to a device for carrying out such a method.