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Secondly,  sensitivity  analysis  is  carried  out  to investigate  the  effects  of  operating  parameters  on column performance. As one of model analysis tools,
sensitivity analysis provides a feasible method to find multiplicity in reactive distillation column. In the following  studies,  the  option  is  selected  that  current  results are used as initial estimates for the next step. In this case, only one operating parameter and the initial estimates  are  variable.  Simulations  are  trivially  converged to extreme (very low and very high) values of certain parameter at first, and then the parameter varies  continuously  with  a  small  step  towards  the  other extreme. If divergence occurs, the step size is reduced by half until the step size is small enough. The above simulation procedure is repeated for all possible operating  parameters  until  all  interesting  cases  are  converged.  After  the  solution  curves  are  observed  and analyzed,  the  multiplicity  existence  in  the  operating region  can  be  determined.  It  is  of  interest  to  discuss why  multiple steady states can be found by performing a sensitivity analysis.
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