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The conventional HYSYS distillation column solving algorithm cannot strictly handle the two liquid phases on the tray. For example, in a distillation column that uses steam to strip hydrocarbons, two liquid phases appear at the top of the column, with water being the second liquid phase. At this point, a water decanter can be added to remove the second liquid phase. To rigorously solve distillation columns that truly have multiple liquid phases, the only solver capable of handling this situation is the “Sparse Continuation Solver”. Enable this feature on the \"Solver\" page of the \"Parameters\" tab in the \"Solving Algorithms\" window. Additionally, the “Based On Two Liquids Check” option allows for the specification of a two-phase check in the distillation column. This inspection is based on one of the following criteria: 1. No 2 liq check – no two-phase check is performed. 2. Tray liquid fluid —— The calculation is based on the liquid composition in the distillation column. 3. Total fluid in the tray —— The calculation is based on the overall composition of the fluid in the distillation column. If this option is selected, it means using a sparse sequential solver. Then go to the “Parameters” tab – 2/3phase page, and enable the two-phase check for trays where there are two liquid phases in the report. The second liquid phase type selection button determines whether the solver checks only pure water as the second liquid phase (Pure) or any type of liquid (Strict). Note: The sparse sequential solver takes longer to converge the column than the regular HYSYS solver. For more interesting content, please visit the blog: http://blog.sina.com.cn/s/blog_6bf5648e0102wvdw.html