Process Simulation And Comparison Of Anhydrous Hydrogen Fluoride Production Devices Separation

In recent decade, with the development of fluorine chemical industry, fluorine chemical industry plays an important role in a growing number of fields such as national defense, refrigeration industry, smelting aluminium industry, metal pickling, microelectronics industry, glass industry, pharmaceutical industry and so on. Anhydrous hydrogen fluoride is one of the important raw materials to prepare organic fluoride. As anhydrous hydrogen fluoride demand increases gradually, the way how to improve and optimize its industrial production technology, reduce the production consumption are becoming the research focus.The classical industrial method for producing anhydrous hydrogen fluoride is by fluorite-sulfuric acid method. Based on the industrial production of anhydrous hydrogen fluoride of 20 kt/a device, we use the chemical process simulation software Aspen Plus to simulate the separation process of hydrogen fluoride, and carry on the detailed calculation and analysis of energy consumption. The concrete content is as follows:The anhydrous hydrogen separation process are established based on the separation process flow diagram including atmospheric separation and pressurized separation process. The residual value and residual percentage are calculated though data analysis and regression to choose suitable physical properties in the module method. ELECNRTL model is used in the simulation of sulfuric acid absorption column and raw HF scrubber column. WILS-HF model is used in the rest of the simulation. On the basis of meeting the requirements of process, simulation is optimized and adjusted by sensitivity analysis from these thee aspects the feed position, the theoretical plate number, and reflux ratio, so as to choose the appropriate input data. The simulation results and industrial production data is identical.In this paper, the anhydrous hydrogen fluoride production unit energy consumption was calculated to compare the atmospheric separation and pressurized separation process, and the results show that for each 1 t anhydrous hydrogen fluoride products, the energy consumption of atmospheric separation process is 301.795 kg standard oil, and it of pressurized separation process is 263.471 kg standard oil. So, the cost of pressurized process is lower. The operation cost can save 14.55% a year. Considering the cost savings in terms of equipment and investment, pressurized separation process can reduce the production cost, and has better economic benefit.In order to choose the best process, this paper compared separation order the heavy and light components in the process of the two step condensation and distillation column. The results showed that the order of firstly separating the heavy components, secondly the light components can improve product yield and the quality of product, while consume the same energy consumption. So, it's more suitable in the industrialization production.