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This post was last edited by *amingteda on 2017-9-6 at 22:58. Dear fellow users, in order to help everyone learn the *ProII process simulation software better – so that beginners can gain knowledge and experienced users can refresh their skills – we are launching a series of lessons on the basics of ProII titled “Making Progress Every Day”. Since I use Aspen Plus/Hysys more frequently in my daily work, I have not studied the ProII software systematically; therefore, the knowledge I offer might be quite basic. I hope fellow users will provide valuable suggestions and opinions, and actively participate in the discussions. Multiple-choice question: 9. Which of the following statements about the distillation solution algorithms in PROII is correct? A. I/O method, Enhanced I/O method, Sure method, Chemdist method, Liquid-Liquid method, Electrolytic method. B. The advantages of the I/O method are fast calculation speed, relative insensitivity to the initial guess value, simultaneous solution of the auxiliary column and the main column, and the ability to use a thermosyphon reboiler. C. The disadvantage of the I/O method is that it can only accommodate one liquid phase, making it difficult to solve for systems with non-ideal behavior, and it does not allow for complete pump cycling. D. The advantages of the enhanced I/O method are: it supports complete liquid-phase or gas-phase side-stream discharge, complete pump circulation, and the presence of a free water phase or water separation on any tray. Answer: ABCD