Improvement of separation process of synthesizing MIBK by the isopropanol one-step method |
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Authors: | Zhigang Lei Jianwei Li Chengyue Li Biaohua Chen |
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Affiliation: | (1) State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Box 35, 100029 Beijing, China |
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Abstract: | The separation process of synthesizing MIBK (methyl isobutyl ketone) by an isopropanol one-step method, in which the multi-component
mixture contains AC (acetone), IPA (isopropanol), water, MIBK, MIBC (methyl isobutyl carbinol), DIBK (di-isobutyl ketone),
etc., was studied. As a high-purity of MIBK over 99.5 wt% is required in industry, the development of an effective separation
method is urgent. In this work, first, by means of VLE (vapor-liquid equilibrium) experiments and PROII simulation, the possible
azeotropes formed in the investigated system were tested. Then, the separation process was simulated with the result that
the calculated and designed values were in good agreement, which indicated that the calculated results were reliable. On this
basis, the original separation process was improved. In the original separation process, the yield of MIBK for a concentration
of MIBK over 99.5 wt% was small, only 32.5%. In the improved separation process (step two), two columns (one extractive distillation
column and the other solvent recovery column) were added and some simplification was made so as to recycle MIBK. In this case
the yield of MIBK was 91.7%. Moreover, about 27.6% water stream per kilogram MIBK product is saved. |
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Keywords: | Isopropanol MIBK One-step Method Process Improvement Distillation |
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