Process Simulation And Energy Saving Optimization Of Propylene Oxide Production By HPPO

Propylene oxide is one of the derivatives of propylene and an important material for basic chemical synthesis.In this paper,the process which can produce 300,000 tons of propylene oxide per year is taken as the research object,and a series of studies have been conducted.Using PRO/II software,the steady-state simulation of HPPO process was carried out.The process is divided into epoxidation unit,light removal unit,propylene oxide refining unit,methanol recovery unit and dehydration unit.According to the characteristics and operating pressure of different unit systems,appropriate thermodynamic methods are selected.The propylene oxide product with purity of 99.95%was obtained.And the influence factors of extractive distillation column were analyzed.On the basis of steady-state simulation results,the energy consumption of the system was analyzed.From the perspective of the whole process,the flow data are extracted,and the heat exchange network is established by Aspen Energy Analyzer software for analysis.From the perspective of unit operation,it was found that the reboiler of the one-effect methanol tower was the most energy-consuming place in the process.The methanol recovery unit was optimized and improved to heat pump distillation based on the original double-effect distillation.Comparing the energy consumption of the two.Based on the DSO dynamic simulation platform independently developed by BUCT,the mathematical model of each unit equipment is established,and each equipment module is connected according to the process.When solving the process,the sequential module method was used.Adjust the parameters until the process is stable and get the dynamic simulation results.Then,a set of simulation training system with the functions of starting and stopping practice and system grading is developed.