If a feature unique to a particular algorithm is needed (e.g., total liquid pump-arounds) then use that algorithm (e.g., SURE) otherwise use the following criteria.
For most systems, it is recommended that the IO algorithm be used. When more than one algorithm can be used to solve a problem, the IO algorithm will usually converge the fastest. It requires the least accuracy in initial conditions and can be used to solve most refinery problems, especially complex columns with side strippers. The IO algorithm can also solve many mildly non-ideal chemical systems and when possible should be the first choice for systems with a single liquid phase. If the inner loop solves but the outer loop will not close then switch to CHEMDIST.
CHEMDIST is recommended for highly non-ideal chemical systems (e.g., azeotropic, extractive, and reactive distillation columns) and systems which require rigorous VLLE calculations other than hydrocarbon/water systems which can be handled better with the SURE algorithm.
The SURE algorithm is the most general algorithm in PRO/II and has several features not available in either IO or CHEMDIST as discussed in question 1. Its limitations are speed and sensitivity to initial conditions, while its strengths are in solving hydrocarbon systems where water must be decanted at locations other than the condenser; columns which have total liquid pump-arounds and total vapor bypasses; and its capability to perform rigorous VLLE calculations when needed (e.g., at the condenser).
About PRO/II: PRO/II is the major product in the Process Engineering Suite (PES). This process simulation software optimizes plant performance by improving process design, operational analysis, and performing engineering studies. It is designed to perform rigorous heat and material balance calculations for a wide range of chemical processes. PRO/II allows users to evaluate the use of heat integration with case studies, rigorously evaluate process improvements with the help of a process flow diagram (PFD), or model crude distillation units. PRO/II offers a wide variety of thermodynamic models to virtually every industry and is incredibly cost effective, decreasing both capital and operating costs.
Technical Support: As always, feel free to reach out to your local technical support team for more information.
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