shortcut计算最小回流比，算下来结果居然是-1 shortcut column 'scd1'
feeds stream phase ------------ ------ s1 liquid products ------------- total stream rates ------------- moles weight liquid vol norm vapor(1) num stream + phase kg-mol/hr kg/hr m3/hr m3/hr section trays ------------ - ---------- ---------- ---------- ---------- ------- ----- s2 l 421.58 17917.34 20.23 9449.28 1 5.40 s3 l 47.50 4191.26 3.91 1064.71 totals 469.08 22108.60 24.15 10513.99 5.40 specifications parameter comp. specification specified calculated type num type value value ----------------- ------- ------------- ---------- ---------- strm s2 2 mol fraction 8.200e-01 8.198e-01 strm s3 1 mol fraction 9.700e-01 9.682e-01 summary of underwood calculations minimum reflux ratio -1.00000 feed condition q 1.29360 fenske minimum trays 5.40407 operating reflux ratio 2.00 * r-minimum
