The Industrial Design Of The Project For 30000t/a Polyoxymethylene Dimethyl Ether

Polyoxymethylene dimethyl ethers, as a kind of very promising environment-friendly high-cetane diesel additives, has great important economic and strategic significance.The scale of the project is 30000 tons/year. Methylal and paraformaldehyde are chosen as raw materials by comparing some existing synthesis process. The mass fraction of products PODE generated eventually is 99.5%. The project content includes the process design, material balance and energy balance, design and slection of some main equipment, heat integration, factory layout and transportation, plant layout, pipeline design, automatic control, environmental protection and economic budget.Process simulation was achieved by using Aspen PlusTM. With pinch technology for analyzing process heat integration, the heat exchanger network is optimized,which increases the efficiency of energy. The material balance and energy balance are completed and some main equipment are designed and selected, including the reactor, columns, heat exchangers, pumps, storage tanks. The selection of factory site, factory layout scheme and automatic control program are completed. Based on the production process and the related standards, the workshop equipment layout is confirmed. Some diagrams are drawn, including the general arrangement plan of factory, piping and instrument diagram, equipment layout diagram. Based on the economical rule, the pipeline is designed. Based on the dangerous situation of material and equipment, measures of environmental protection are taken, pollution sources and corresponding treatment approaches are also illustrated. Finally, the project is proved feasible by economic budget, with better economic and social benefits.