The Simulation Calculation Analysis Of Three-component Fully Thermally Coupled Distillation Columns And Conventional Distillation

Distillation is the most typical and most important separation process in chemical industry, and distillation process requires energy as the price. Energy-saving technology of distillation process is an important research content. Booming developmental computer technology providing quickly accurate and large information amount of data for researching energy-saving programs of distillation process on low cost, therefore, has became an important method of distillation energy saving research. Energy Consumption of three-component direct distillation, indirect distillation and fully thermally coupled distillation column have been simulated and computed by Aspen plus process simulation software in a fixed number of trays and feed thermal –condition, when the separation factor was 0.49,0.93 and 1.48, and composition of component B varied within the range of 0.1 to 0.9. The results showed that separation index is the most important factor affecting the three-component distillation, and if the separation index closer to 1, the more energy. Other instances, energy consumption will decline both the separation index is greater than 1 or less than 1. In addition, changes in the relative volatility, boiling point, component content, etc. of three-component all have an impact on energy consumption. When separation index is small, the composition of intermediate component in feed has a certain impact on the three-component distillation, and the closer to 1, the smaller the impact. This impact has been reduced when the separation index more than 1. More programs should be selected for detailed study. Regardless of how most of the separation index is, energy consumption of fully thermally coupled distillation column is the lowest, followed by direct distillation,and indirect distillation is the largest on the same separation index. The composition of intermediate component in feed has a greater effect on three-component fully thermally coupled distillation column than direct distillation and indirect distillation.