翻译下文设计说明：环氧树脂是一种常用的高分子材料是重要的热固性树脂材料。它具有优良的机械物理性能、电的绝缘性能、耐化学腐蚀的性能、耐热性及粘连性能。其广泛应用于涂料生产、电子科学材料、建筑建造材料、航空航天等领域。根据要求的设计任务书设计为年产5万吨环氧树脂工艺设计通过对大量的文献资料的搜索检阅对环氧树脂的生产工艺、设备等进行了科学论证及设计。根据环氧树脂生产在技术上的严格要求本设计选择了相应的配

Design Description: Epoxy resin is a commonly used polymer material and an important thermosetting resin material. It has excellent mechanical and physical properties, electrical insulation properties, chemical corrosion resistance, heat resistance, and adhesive properties. It is widely used in coatings production, electronic science materials, building construction materials, aerospace, and other fields. According to the requirements of the design task book, this design is for the production of 50,000 tons of epoxy resin per year. Through searching and reviewing a large amount of literature, the production process and equipment of epoxy resin were scientifically demonstrated and designed. Based on the strict technical requirements for epoxy resin production, this design selected the corresponding formulation and production process conditions. Currently, low molecular weight liquid epoxy resin and medium molecular weight solid epoxy resin generally use a one-step process, and high molecular weight epoxy resin uses a two-step process. Epoxy resin synthesized using bisphenol A (BPA) as the main raw material is called bisphenol A (BPA) type epoxy resin, which is currently the largest in production and the most widely used epoxy resin. Due to its application in many fields of the national economy, it is also called a general-purpose epoxy resin. Therefore, this design uses a one-step process: bisphenol A (BPA) and epichlorohydrin (ECH) are condensed under the action of sodium hydroxide, which is a process method in which opening and closing reactions are carried out under the same reaction conditions. This design determines the production process of the product. Bisphenol A and epichlorohydrin are dissolved in a dissolution kettle and heated to 70°C, then cooled to 50°C, and the first batch of NaOH solution is dripped at 50°C-55°C. Then, it is heated to 55°C-60°C and kept warm for 4 hours to fully react. The reaction mixture is cooled to below 65°C, and benzene is added. At the same time, the second batch of NaOH solution is dripped in 1 hour. The reaction is kept warm for 3 hours at 65°C-70°C. When the reaction mixture is cooled to below 40°C, it is placed in a separator and washed with hot water to separate the water layer until the benzene solution of the epoxy resin is transparent. The epoxy resin solution is filtered and enters the storage tank before being refined in the refining kettle. First, it is distilled under atmospheric pressure, and then under reduced pressure to remove benzene. The distilled benzene enters the benzene recovery device through the condenser, and the resin enters the storage tank after being filtered to obtain the product. This design also includes the design of the reaction kettle, kettle body, kettle cover, stirring device, etc., and calculates the material and heat balances based on the selected production process solutions. The annual production of epoxy resin in this design task is 50,000 tons. According to the calculation, continuous shifts can be produced, with two shifts per day. Therefore, the planned actual daily production is 166.67 tons, and the production of each shift is 83.34 tons. The entire production process is carried out in the same reaction kettle, which requires a closed stirring dissolution kettle with a capacity of 50,000 liters heated by water vapor, using a paddle stirrer, an elliptical upper head, and a conical lower head. A 50,000-liter enamel glass closed stirring reaction kettle cooled by ice salt water can be used according to the production requirements, and the material used is nickel-cobalt stainless steel. There will be excess epichlorohydrin in the production process of epoxy resin. Each material can recover 4 units of epichlorohydrin. A 1000-liter epichlorohydrin recovery kettle is required, and a thin film evaporator and a tube condenser are needed to recover toluene and resin. The thin film evaporator uses a rotary scraper thin film evaporator, which greatly improves the recovery efficiency of the material and the design of the tank capacity. Keywords: epoxy resin, one-step method, reaction kettl