A continuous process for the purification of cyclohexanone using a mild aqueous heat transfer medium as a refrigerant
A heat transfer medium, cyclohexanone technology, applied in the separation/purification of carbonyl compounds, ammonium sulfate, organic chemistry, etc., can solve problems such as adding heat exchangers
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[0086] Example 1 Except that instead of using condensed water in the condenser of the initial distillation column and the condenser of the heavy fraction removal column [D], an aqueous heat transfer medium with a temperature of 66° C. was used, other operations were the same as those of the comparative example. In addition, in an embodiment of the present invention, a closed-loop system using an aqueous heat transfer medium ( figure 2 ) connects the Beckmann rearrangement step with the cyclohexanone purification step and then with the ammonium sulfate crystallizer. The aqueous heat transfer medium is first fed into the condenser of the heavy ends removal column and then into the condenser of the initial distillation column. In the condenser of the heavy ends removal column, the aqueous heat transfer medium was heated from 66°C to 79°C. The aqueous heat transfer medium is further heated to 90°C in the condenser of the initial distillation column.
[0087] The heated aqueous ...
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