近年來，國內順酐的表觀消費量不斷增加，順酐是具有許多用途的單體和中間體，主要用于不飽和聚酯樹脂和1，4_丁二醇，還可以用來增塑劑、表面涂料、農用化學品、潤滑劑、蘋果酸和富馬酸等。
In recent years, the apparent consumption of maleic anhydride in China has been continuously increasing. Maleic anhydride is a monomer and intermediate with many uses, mainly used in the production of unsaturated polyester resin and 1,4_ Butanediol can also be used to produce plasticizers, surface coatings, agricultural chemicals, lubricants, malic acid, and fumaric acid.
順酐的方法有苯法、正丁烷法、碳四烯烴法等，其中苯法作為傳統原料，被廣泛用來順酐，傳統順酐中精制系統都是采用一塔一釜的間歇式過程，工藝流程復雜，成品質量不易控制，給企業的經濟效益帶來影響，且產生較多的廢渣以及污水，再增加環境污染的同時，還會大大縮短洗釜的周期，容易腐蝕設備，增加企業的成本。
The methods for producing maleic anhydride include benzene method, n-butane method, carbon tetraolefin method, etc. Among them, benzene method is widely used as a traditional raw material to produce maleic anhydride. The refining system in traditional maleic anhydride production uses a batch production process with one tower and one kettle, which is complex in process flow and difficult to control the quality of finished products, which affects the economic benefits of enterprises and generates a lot of waste residue and sewage, which increases environmental pollution, It will greatly shorten the washing cycle of the kettle, easily corrode the equipment, and increase the cost of the enterprise.
順酐廠家認為，這里要解決的問題是提供一種工藝設計合理、成品質量穩定、收率高的順酐的連續精制系統。
The maleic anhydride manufacturer believes that the problem to be solved here is to provide a continuous refining system for producing maleic anhydride with reasonable process design, stable product quality, and high yield.
為解決上述技術問題，本發明采用的技術方案是一種順酐的連續精制系統，包括精制釜、第二精制釜、恒沸脫水塔、溶劑回收塔以及精制塔，所述恒沸脫水塔上設有進酸水管以及加粗酐管，所述精制釜與恒沸脫水塔的下方通過管道連接且管道上設有閥門，精制釜與溶劑回收塔通過管道連接且管道上同樣設有閥門，所述第二精制釜與恒沸脫水塔的下方通過管道連接且管道上設有閥門，第二精制釜與溶劑回收塔通過管道連接且管道上同樣設有閥門，精制釜、第二精制釜分別與恒沸脫水塔底端的管道連通且兩支管道上分別設有閥門，恒沸脫水塔上設有恒沸冷凝器，溶劑回收塔的上方設有溶劑冷凝器，且溶劑冷凝器下方設有第二二甲苯罐，溶劑回收塔的底端通過第二泵與精制塔連接，精制塔的上方連接有精制冷凝器，精制冷凝器與順酐冷凝器進口連接，且順酐冷凝器出口與第二成品罐連接，所述恒沸脫水塔還通過管道分別與成品罐、粗酐罐以及二甲苯罐連接。進一步，所述加粗酐管設在恒沸脫水塔的中間位置。保證粗酐在加入過程中就完全脫水，從而提聞精制收率。進一步，所述恒沸冷凝器上設有循環水出口以及循環水入口。減少溫水用量的負荷。進一步，所述溶劑回收塔通過泵與第三二甲苯罐連接。進行流量穩定的強制回流，從而使塔頂溫度穩定。本發明具有的優點和積極效果是由于采用上述技術方案，一塔一釜恒沸脫水，兩塔一釜精餾脫成品同時連續進行；所述恒沸脫水塔還通過管道分別與成品罐、粗酐罐以及二甲苯罐連接。使恒沸脫水塔既可以進行連續精制中的脫水部分，也可以進行整套的間歇式順酐精致；成品質量穩定，收率高；減少廢渣的產生量；洗釜周期延長15-20天，減少洗釜廢水的產生量。本發明使順酐的精制過程更加方便；具有結構簡單，維修方便，加工成本低、效率高等優點。
To solve the above technical problems, the technical solution adopted by the present invention is a continuous refining system for producing maleic anhydride, including a first refining kettle, a second refining kettle, a constant boiling dehydration tower, a solvent recovery tower, and a refining tower. The constant boiling dehydration tower is equipped with an acid inlet water pipe and a coarse anhydride pipe, and the lower part of the first refining kettle and the constant boiling dehydration tower is connected through a pipeline with a valve on the pipeline, The first refining kettle is connected to the solvent recovery tower through a pipeline, and the pipeline is also equipped with valves. The lower part of the second refining kettle and the constant boiling dehydration tower is connected through a pipeline, and the pipeline is equipped with valves. The second refining kettle is connected to the solvent recovery tower through a pipeline, and the pipeline is also equipped with valves. The first refining kettle and the second refining kettle are respectively connected to the pipeline at the bottom of the constant boiling dehydration tower, and valves are respectively installed on the two pipelines, There is a constant boiling condenser on the constant boiling dehydration tower, a solvent condenser above the solvent recovery tower, and a second dimethylbenzene tank below the solvent condenser. The bottom end of the solvent recovery tower is connected to the refining tower through a second pump, and a refining condenser is connected above the refining tower. The refining condenser is connected to the inlet of the maleic anhydride condenser, and the outlet of the maleic anhydride condenser is connected to the second finished product tank, The constant boiling dehydration tower is also connected to the first finished product tank, crude anhydride tank, and first xylene tank through pipelines. Furthermore, the thickened anhydride tube is located in the middle of the constant boiling dehydration tower. Ensure that the crude anhydride is completely dehydrated during the addition process, thereby improving the refining yield. Furthermore, the constant boiling condenser is equipped with a circulating water outlet and a circulating water inlet. Reduce the load of warm water usage. Furthermore, the solvent recovery tower is connected to a third xylene tank through a first pump. Conduct a forced reflux with stable flow rate to stabilize the tower top temperature. The advantages and positive effects of the present invention are due to the adoption of the aforementioned technical scheme, where one tower and one kettle are subjected to constant boiling dehydration, and two towers and one kettle are subjected to continuous distillation of the finished product simultaneously; The constant boiling dehydration tower is also connected to the first finished product tank, crude anhydride tank, and first xylene tank through pipelines. The constant boiling dehydration tower can perform both the dehydration part of continuous refining and the complete batch production of maleic anhydride; Stable product quality and high yield; Reduce the generation of waste residue; The washing cycle is extended to 15-20 days to reduce the production of washing wastewater. The present invention makes the refining process of maleic anhydride more convenient; It has the advantages of simple structure, convenient maintenance, low processing cost, and high production efficiency.
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