In water treatment process, maleic anhydride is an important basic raw material of organic chemical industry, and is the third largest anhydride after acetic anhydride and phthalic anhydride for consumers. The main purpose of maleic anhydride is to produce unsaturated polyester resin. In addition, maleic anhydride is also used in coatings, inks, lubricant additives, agricultural chemicals, paper sizing agents, textile finishing agents, surfactants and other aspects. With maleic anhydride as raw material, tetrahydrofuran, fumaric acid Tetrahydrophthalic anhydride and other important fine chemical products.

目前，顺酐的是以苯和空气为原料，顺酐废水处理系统采用催化剂经固定氧化床氧化生成顺酐物料气，生成的顺酐物料气经部分冷凝器冷凝后，气体进入到吸收塔被软水吸收为浓度40%的顺酸溶液，40%的顺酸溶液进入到恒沸精馏段利用脱水剂脱去自由水和分子内水，脱水剂为邻二甲苯、二甲苯循环使用，脱水后的粗酐从粗酐罐中打入到连续恒沸塔中进行精馏。

At present, the production of maleic anhydride is based on benzene and air. The wastewater treatment system of maleic anhydride production uses catalyst to oxidize in a fixed oxidation bed to generate maleic anhydride material gas. The generated maleic anhydride material gas is condensed in part of the condenser, and then enters the absorption tower to be absorbed by soft water into a 40% concentration of maleic acid solution. 40% of the maleic acid solution enters the azeotropic distillation section to remove free water and intramolecular water with dehydrator, which is o-xylene Xylene is recycled, and the dehydrated crude anhydride is pumped from the crude anhydride tank into the continuous azeotropic tower for distillation.

即可得到成品的顺酐，上述方法在的过程中除了顺酐之外，还会出一系列的副产物，随着时间的加长，这些副产物会造成设备堵塞，所以，在设备使用一段时间后需要用水进行清洗，这样容易产生废水，且在恒沸精馏的过程中，恒沸塔和恒沸精馏釜内会有部分残留的顺酐出现，如果将清洗后的废水直接作为废液进行排放，既浪费水源又污染环境。

The finished product of maleic anhydride can be obtained. In addition to maleic anhydride, the above method will also produce a series of by-products in the production process. With the extension of production time, these by-products will cause the production equipment to be blocked. Therefore, after the equipment is used for a period of time, it needs to be cleaned with water, which is easy to produce waste water. In the process of azeotropic distillation, there will be some residual maleic anhydride in the azeotropic tower and the azeotropic distillation kettle, If the waste water after cleaning is directly discharged as waste liquid, it will waste water and pollute the environment.

在现有的技术中，顺酐的废水大都采用现有的顺酐废水处理工艺进行处理，也就是先将废水进行隔油处理，再加入强酸强碱进行离心分离，之后再加入混凝剂进行混凝处理，然后在进行萃取，后再加入碱液进行浓缩蒸馏，上述的顺酐废水处理工艺虽然实现了不同物质的回收再利用，但是在处理的过程中，处理的过程较为复杂，处理的成本也较高，而且处理工艺的复杂

In the existing technology, the wastewater from maleic anhydride production is mostly treated by the existing maleic anhydride production wastewater treatment process, that is, the wastewater is first treated by oil separation, then added with strong acid and strong alkali for centrifugation, then added with coagulant for coagulation treatment, then extracted, and then added with alkali for concentration and distillation. Although the above maleic anhydride production wastewater treatment process realizes the recovery and reuse of different substances, But in the process of treatment, the treatment process is relatively complex, the treatment cost is also high, and the treatment process is complex