Method for adding crude anhydride in maleic anhydride production process
A technology of maleic anhydride and crude anhydride, applied in the field of maleic anhydride production, can solve the problems of shortening the washing cycle, increasing environmental pollution, increasing enterprise costs, etc., and achieves the effect of convenient refining process, increasing economic benefits and high production efficiency
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[0011] A method for thickening maleic anhydride in the process of producing maleic anhydride. The refining system for producing maleic anhydride adopts a continuous refining system consisting of two refining kettles, azeotropic dehydration tower, solvent recovery tower, and refining tower. :Put the crude anhydride directly into the azeotropic dehydration tower, and add the crude anhydride from the middle of the azeotropic dehydration tower.
[0012] Such as figure 1 As shown, a refining system used in the method for thickening anhydride in the process of producing maleic anhydride as described above is characterized in that it includes a first refining tank 1, a second refining tank 2, azeotropic dehydration tower 3, and a solvent recovery Tower 7 and refining tower 10, the azeotropic dehydration tower 3 is provided with an acid water inlet pipe 4 and a crude anhydride pipe 5, the first refining tank 1 and the solvent recovery tower 7 are connected by pipelines, and the pipelines...
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