HYSYS simulation of the tert-butanol extraction column does not converge

2019-05-23View Original

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I have been using HYSYS to simulate a tert-butanol extraction column recently, but fatal errors keep occurring in the simulation results. NRTL was used for the calculations. I would like to ask everyone for help in running the simulation and analyzing the reasons for these errors. Feed to the extraction tower: 40°C, 0.62 MPa, 5860 kg/h. The components and their mass fractions are as follows: tr2-Butene 0.001, cis2-butene 0.001, i-Pentane 0.031, n-Pentane 0.015, 1-Pentene 0.004, tert-Butanol 0.115, 2,44-Menthen-2-one 0.7780, disec-BEther 0.0030, 1-Dodecene 0.052. The extraction water is pure water, at 0.7 MPa and a flow rate of 20,000 kg/h, at 40°C. The extraction tower has 40 trays; the temperature, flow rate of the feed, and the number of trays can all be adjusted as needed.

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HYSYS simulation of the tert-butanol extraction column does not converge

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