This paper introduces a chemical process control system based on the Internet of things, which combines ESP8266WiFi module and multiple sensors. The system includes temperature control, pressure control, concentration control, humidity control, raw material prediction, intelligent adjustment, intelligent judgment, intelligent scheduling. Users can establish a connection with the system by logging in PC or mobile APP to monitor and control the factory's production process in real time. And through the intelligent analysis of product demand, the production line optimization, the optimal configuration of services. Establish a set of self - perception, self - communication, self - learning self - optimization of intelligent control system. The control system of the chemical process is simulated, and the purpose of real-time monitoring, real-time judgment and real-time scheduling is achieved. It shows the feasibility and necessity of intelligent control. Intelligent chemical industry and intelligent manufacturing are the necessary trend of the development of science and technology in the future.
Isopropanol is an extremely widely used chemical product. With the outbreak of COVID-19 worldwide, the export demand of isopropanol keeps increasing, and the supply is in short supply. In order to meet the demand of isopropyl alcohol in the international market, the existing production process faces new challenges and needs to be improved and upgraded. In this design, Aspen Plus was used to simulate the existing hydrogenation process of acetone to isopropanol, and it was improved and optimized to establish an annual output of 5 kT isopropanol and a variety of by-products of different specifications. The process adopts double-effect distillation and heat pump distillation to reduce energy consumption, and a set of waste liquid recovery device is designed to effectively recover the by-products and achieve the purpose of improving economic benefits. Simulation results of Aspen Plus show that energy consumption, carbon emission, water consumption and solid waste utilization rate can be reduced by 36.73%, 40%, 45% and 80% respectively, meeting the requirements of “Made in China 2025”.
Vinyl acetate is a bulk chemical consumed by millions of tons annually. It has a wide range of uses and broad development prospects, but also means that there is a large space for improvement in the application of advanced technology. Acetylene gas phase method commonly used at present has the advantages of high selectivity and low equipment requirements, but the process has high energy consumption, so it is necessary to optimize the energy saving aspect of the process. In this design, Aspen Plus is used to simulate and analyze the existing process, pinch point technology is used to optimize the heat exchange network, and heat pump distillation and double-effect distillation technology is used to optimize the reaction and separation equipment to reduce energy consumption and achieve the goal of energy saving. The simulation results show that the energy recovery of the improved process is 0.49×105kW, namely 49.81mW, and the energy recovery is 28.6%. At the same time, in the process of producing vinyl acetate in this project, the recycling and utilization of byproducts can achieve a circular economy and meet the requirements of green development 2020 in “Made in China 2025”.
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