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，順酐的是以苯和空氣為原料，順酐廢水處理系統采用催化劑經固定氧化床氧化生成順酐物料氣，生成的順酐物料氣經部分冷凝器冷凝后，氣體進入到吸收塔被軟水吸收為濃度40%的順酸溶液，40%的順酸溶液進入到恒沸精餾段利用脫水劑脫去自由水和分子內水，脫水劑為鄰二甲苯、二甲苯循環使用，脫水后的粗酐從粗酐罐中打入到連續恒沸塔中進行精餾。

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.

即可得到成品的順酐，上述方法在的過程中除了順酐之外，還會出一系列的副產物，隨著時間的加長，這些副產物會造成設備堵塞，所以，在設備使用一段時間后需要用水進行清洗，這樣容易產生廢水，且在恒沸精餾的過程中，恒沸塔和恒沸精餾釜內會有部分殘留的順酐出現，如果將清洗后的廢水直接作為廢液進行排放，既浪費水源又污染環境。

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.

在現有的技術中，順酐的廢水大都采用現有的順酐廢水處理工藝進行處理，也就是先將廢水進行隔油處理，再加入強酸強堿進行離心分離，之后再加入混凝劑進行混凝處理，然后在進行萃取，后再加入堿液進行濃縮蒸餾，上述的順酐廢水處理工藝雖然實現了不同物質的回收再利用，但是在處理的過程中，處理的過程較為復雜，處理的成本也較高，而且處理工藝的復雜

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