Construction Of Double Circulating Vapor-Liquid Equilibrium Device And Measurement Of Vapor-Liquid Equilibrium Data

With the development of chemical industry, there are large scale equipment of rectification and absorption. Equipment design and separation process operating condition control all need the credible and accurate Vapor-Liquid phase equilibrium data.Circulating vapor-liquid equilibrium equipment has its advantage in determining the data of vapor-liquid equilibrium: rapid in equilibrium, steady in running and can be used extensively. It receives increasingly attention.A set of stainless steel double circulating vapor liquid and on line analysis equilibrium device was designed and established on the base of analyzing the structure and behavior of other VLE equipment. The main characteristic of equipment is:(1) Vapor and liquid circulate concurrent and contact count-current. The mass transfer rate of two phases is quick. So it need short time in equilibrium and improve the efficiency to determine VLE data.(2) The circulating pump of the equipment is running with magnetic force. It avoid the disturbance which caused by phase transition. The circulating pump seals easily.(3) The device use six-way valve to sample on line. It avoid the error which the conventional sample analysis method has. At the same time, it extend the scope of device.Study the relationship of circulating pump operating condition and circulating quantity of vapor and liquid. So we can choose the suitable circulating quantity.The VLE data of pentane plus benzene binary system at 35℃and 45℃were determined. The results are in good agreement with the literatures. Furthermore, the VLE data of pentane plus benzene system were determined at 30℃and 55℃. Ethanol plus DMF system was determined at 30℃,40℃and 50℃.