Mathematic Modeling Of Industrial Process Of Producing Ketene By Cracking Acetic Acid

The ketene route to acetic anhydride is a mature and widely used way in the production of acetic anhydride in the world, although the oxo synthesis process which owns a cheaper cost than the process of cracking acetic acid has been used for 20 years since it was developed in 1983 by Eastman Company. .According to the statistical data of 1998, 72% acetic anhydride is produced in the process of ketene route in America and West Europe, and the production in the oxo synthesis process is only about a quarter of the total production in the world in 1998.Another reason for the running of the cracking acetic acid route is that the ketene which is an intermediate product in manufacturing acetic anhydride by cracking acetic acid is a very active and valuable intermediate product. The cracking furnace of acetic acid has always been paid attention to. There are 10 such furnaces in the Calcium Carbide Factory of Jilin Chemical Industry Company Ltd. There is evident gap between the world most advanced level and our Factory, not only in the production capacity but also in the consumption of materials, although we have been tapping the potential since our Factory went into operation in 1965. The production capacity of a furnace in our Factory is only half of a furnace in the Celanese Company, and for the consumption of acetic acid in producing 1000kg acetic anhydride, the world most advanced level is 45kg less than our consumption. One of the reasons to which lead the gap mainly lies in lacking deep fundamental research and theoretical analysis to the industrial process.The mathematical model used in this paper proceeds from actual conditions and is set up by analyzing the course of reaction and studying the reaction kinetics. It is proved by simulating the course of reaction under actual conditions that the simulated result tallieswith the corresponding data in actual course of production and the reliability of the model is tested. On the basis of the simulation, this mathematical model is used for simulating the reformed cracking furnace and its capacity is checked. In addition, this mathematical model is used for simulating the course of production under the conditions of several loads. The limited load and the main technological conditions under the conditions of several loads are defined, and then the datum operation parameters are provided. This simulated result avoids the blindness at the beginning of the breaking-in period and improves the grade of the reformation. From this point of view this simulation has profound significance.