Abstract:

A different pressure thermally coupled distillation technology was developed to achieve energy saving. In this technology，a distillation column was divided to two columns with different pressure. The top stream from the high-pressure column was used as the heat energy for the reboiling of the low-pressure column，therefore the thermal coupled process was realized. Computer simulation technology has been used to analyze the energy saving of different pressure thermally coupled distillation technology in separation of propane-propylene and C4’s hydrocarbon respectively. The results showed that，comparing with ordinary distillation technology，energy consuming could be reduced about 92.3％ and 87.1％ in these two separation process，respectively.