关键词: 分离, 优化设计, 蒸馏, 异丁烷, 热泵精馏, 节能

Abstract: As an abundant resource,isobutane has relatively low industrial utilization and reuse. A conventional process was capable of separating isobutane from a mixture of this compound with C₃ and C₄;however,large energy consumption was needed due to high purity requirements.. The current treatment of distillation process is limited to optimizing process parameters,but the heat pump is rarely reported. To solve this problem,this research a designed and optimized the distillation procedure to minimize the energy consumption in the isobutene/n-butane separation. The simulated results of the process showed that the optimal energy-efficient was obtained at 7×10⁵Pa at the top and 7.5×10⁵Pa at the bottom,the circle working flow of 3055.13kmol/h and the compression ratio of 2.286. A thermodynamic analysis for the heat pump system was performed,and compared with conventional process. The results suggested that the new process was able to decrease the energy consumption from 68.16GJ/h to 45.87GJ/h. The proposed heat pump technology could be used as an energy-saving and green technology.

Key words: separation, optimal design, distillation, isobutane, heat pump distillation, energy saving