(332b) Experimental and Simulation Study on Start-up of Dividing Wall Column for High Purity Separation of Alcohols
AIChE Annual Meeting
2018
2018 AIChE Annual Meeting
Separations Division
Distillation Processes Fundamentals, Developments, and Applications II
Tuesday, October 30, 2018 - 12:55pm to 1:20pm
The purpose of this paper is to study the startup of DWC. Firstly, Aspen Dynamics platform is used to conduct a large number of simulation experiments and two different control structures were selected. At the same time, a pilot-scale DWC separation process using ethanol, propanol, and butanol as a system, a diameter of 400mm, a height of 12.5m, and a DCS control system was established. The system can record the total time of the DWC from cold and empty state to the steady state, temperature profile and the composition profile at different times, product flow rate, feed flow rate, feed temperature, liquid split ratio, steam consumption and other key parameters. After that, start-up tests operation were conducted on the system, and the total time required for start-up of DWC with different control structures, raw material consumption, and energy consumption were analyzed. The experiment determined the optimal control structure of startup of DWC and verified its reliability. Finally, the energy-saving mechanism of different control structures was initially discussed.