Using Zigzag Force Process Design And Simulation Of Rotating Bed Recovery Of Acetonitrile

According to the plant manufacture property, a solvent recovery process was designed to recovery the acetonitrile affluent which was composed of 60% wt acetonitrile and 40% wt water. On the basis of convenient process, we used Rotating Zigzag Bed - a novel kind of process intensification equipment, to replace the conventional columns and minimize the process. The effluent was separated into two phases by addition of salt, and acetonitrile-phase and water-phase were purified by RZB, respectively. The equipment were designed through material and energy balance, and we got the operation parameters about the process. The process was characterized by the following,Brine used in the process was crystallized directly in the water-phase pot to prepare for the next batch, this avoid jamming the pipe in the process of transport brine and minimize the salt recovery system.Using Rotating Zigzag Bed in the process, this kind of equipment is characterized by high mass transfer efficiency, minimization (the bulk was only tenth of the conventional columns) ,low energy consumption, easy installation and operation. The practice proofed the extraordinary advantages and potential of RZB in the solvent recovery.Salt was added to separated the effluent into two phases, which improve the efficiency and decrease the cost.The effluent was fully recovered in the process, which made the process to be green and promoted the less energy, less emission policy.The results of the plant is: acetonitrile product purity was 99.5% by wt and the yield was 85%, acetonitrile was under 0.1% by wt in the water phase. The design satisfied the standard of the plant. The process was successful.Aspen Plus was used to simulate the process, we analyzed the relation between the reflux ratio, boil-up vapour and the product fraction and compared the simulation with the plant results.