Constant-boiling dehydrating system used for producing maleic anhydride

Abstract

The invention provides a constant-boiling dehydrating system used for producing maleic anhydride; the system comprises a refining kettle and a constant-boiling dehydrating tower, wherein the constant-boiling dehydrating tower is provided with an acid water inlet pipe and a rough anhydride feed pipe; the refining kettle and the lower side of constant-boiling dehydrating tower are connected by a pipeline which is provided with a valve; the refining kettle and a solvent recovering tower are connected by a pipeline which is provide with one valve as well; the refining kettle is communicated with the pipeline of the bottom end of the constant-boiling dehydrating tower, and the pipeline is provided with one valve; the constant-boiling dehydrating tower is provided with a constant-boiling condenser; the constant-boiling dehydrating tower also is respectively connected with a product tank, a rough anhydride tank and a dimethylbenzene by pipelines. By adoption of the constant-boiling dehydrating tower, the dehydrating operation in a continuous refining process can be carried out, and a complete cycle of intermittent type maleic anhydride fine product also can be carried out; the constant-boiling dehydrating system has the following advantages of simple structure, convenience for maintenance, low processing cost, high strain property and the like.

Description

technical field [0001] The invention belongs to the technical field of maleic anhydride production equipment, in particular to an azeotropic dehydration system for producing maleic anhydride. Background technique [0002] In recent years, the domestic apparent consumption of maleic anhydride has been increasing continuously. Maleic anhydride is a monomer and intermediate with many uses, mainly used in the production of unsaturated polyester resin and 1,4-butanediol, and can also be used to produce Plasticizers, surface coatings, agrochemicals, lubricants, malic and fumaric acids, etc. The methods for producing maleic anhydride include benzene method, n-butane method, carbon tetraolefin method, etc. Among them, the benzene method is widely used as a traditional raw material to produce maleic anhydride, and the refining system in traditional maleic anhydride production uses one tower and one kettle Intermittent production process, complex process, difficult to control the qua...

AI Technical Summary

Problems solved by technology

The methods for producing maleic anhydride include benzene method, n-butane method, carbon tetraolefin method, etc. Among them, the benzene method is widely used as a traditional raw material to produce maleic anhydride, and the refining system in traditional maleic anhydride production uses one tower and one kettle Intermittent production process, complex process, difficult to control the quality of finished products, which will affect the economic benefits of the enterprise, and produce more waste residue and sewage, which will not only increase environmental pollution, but also greatly shorten the cycle of washing the kettle, which is easy to corrode equipment, increasing the cost of the business

If the continuous refining system with three towers and two kettles is adopted, the continuous refining has the following advantages: the quality of the finished product is stable and the yield is high; the generation of waste residue is reduced; the cleaning period of the kettle is extended to 15-20 days, and the production of wastewater from washing the kettle is reduced, but Due to the continuous distillation, once some equipment such as the rectification tower fails, the system will shut down as a whole, seriously affecting the normal production of the enterprise and causing economic losses

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