Experimental Study On Mass Transfer Performance Of High Speed Dispersion Reactor

In the end of the polymerization reaction, there are volatile components in the product. These components include unreacted monomers, dimers due to side reactions, as well as volatile gases contained in the material.The presence of volatile components may affect the nature of the polymer and the quality of the product. Therefore, volatile components should be removed in the production process of the polymer.The process of the volatile componentsremoval is devolatilization.There are many kinds of apparatus for devolatilization,including flash tank, screw extruder and so on. In the process of devolatilization, these devices have some disadvantages,such as high energy consumption. High-speed disperser reactor is a new type of device fordevolatilization. Rotor will form strong shear force by high-speed rotation, Polymer is dispersed under the shear force, so the process of mass transfer is strengthened and the efficiency of mass transfer is increased.The syrup is used as high viscosity polymer and the acetone is used as volatile in the paper. The experimental argument is pressure, rotor speed, the initial concentration of acetone, feed rate and rotor structure. Experimental device is closed to the industrial device. By using UV visible spectrophotometer to obtain an acetone content so that it can calculatedevolatilization rate and it can get the mass transfer performance of the device and devolatilization rate variation with the experimental variables.Getting the following conclusions by the orthogonal experiment,getting the importance order of the independent variable as follows:vacuum> speed> initial concentration> feed quantity. When the speed, feed rate and initial concentration are the same,removal rate decreases as the pressure increases, with the increasing of pressure,Thetrendsof the decreasing of removal rate become smaller. When the pressure, the initial concentration ofacetone and the feed quantity are the same, removal rate increases with the increasing of the speed under a certain speed.The rate of devolatilization of increase more slowly as the speed increases.there is a maximum for speed on the removal rate for three-stages rotor. Removal rate increaseswith the increases of speed when the speed is less than the maximum.Removal ratedecreases as the speed increases when the speed exceeds the maximum. When the pressure, speed, feed rate are the same,removal rate decreases as the initial concentration decreases. Removal rate reduced will be more slowly with the decrease of initial concentration. When the pressure, speed, initial concentration are the same, removal ratedecreases with the increase of feed quantity. But the influences of different structure of the rotor are different.In the single-stage rotor, removal rate will be significantly reduced with the increases of feed rate under 300 rpm and 1500 rpm. In the three-stages rotor, removal rate will be significantly reduced with the increases of feed rate under 300 rpm, but removal ratedose not change significantly under 1500 rpm. When the pressure, speed, feed rate, initial concentration and feed quantity are the same,removal ratewill change as the changeof the rotor's structure, Thedevolatilization of three-stages high-peed disperser reactor is higher than the single-stage high-speed disperser reactor.