Dynamic Control Studies Of Cyclohexanol Production By Cyclohexene Hydration In Catalytic Distillation

Cyclohexanol is an important use organic compound with a wide range of uses.The traditional method has some disadvantages,high production costs,low conversion rate,separation difficulty.Now development of efficient and safety production methods became the focus of the current research.Therefore,this subject has studied production process of cyclohexene hydration in catalytic distillation column to cyclohexanol.The research on this production process is still in the steady state simulation and experimental stage.There are few studies on dynamic control.Therefore,the research in this paper is also to fill this gap.The thesis was contained the following contents:1.The accuracy of the steady-state model of the catalytic distillation column used was verified by conducting a catalytic distillation experiment.The temperature distribution and composition distribution in the tower were measured and compared with the simulation results.It can be proved that the catalytic distillation column model is accurate and reliable.2.The production process of cyclohexene hydration in catalytic distillation column to cyclohexanol was established.The production process was simulated using Aspen Plus process simulation software to obtain the optimal operating conditions of the catalytic distillation column.The purity of the cyclohexene was 99.2 wt%,and the conversion per pass of cyclohexene was 64.49%.3.Aspen Dynamics software was used to investigate the dynamic response of cyclohexanol production and purity when the organic phase reflux ratio of the RD column,the reboiler duty of the RD column,and the feed flow rate changed.It can be seen from the results that the yield and purity of cyclohexanol are sensitive to the reboiler duty of the RD column and the organic phase reflux ratio of the RD column,and the responses to the forward and reverse directions are also symmetrical,which are suitable as manipulated variables.4.Three different control schemes were established(CS1,CS2,CS3),and the position of temperature sensitive stage was selected by using sensitivity analysis method and singular value decomposition method.The Tyreus-Luyben empirical tuning method was used to tune the controller parameters.Finally,Aspen plus Dynamics simulation software was used to evaluate the performance of the three control schemes.By introducing ?F±20% and xENE±5%),comparison the changes in product purity and yield of the three different control schemes.By comparison,we can see that the control scheme CS3 has the best performance.