Method for optimizing operation of solvent dehydration system during production process of aromatic acid

The invention discloses a method for optimizing the operation of a solvent dehydration system during the production process of aromatic acid. The aromatic hydrocarbon corresponding to the aromatic acid to be prepared is taken as the azeotropic agent; then the aromatic hydrocarbon is subjected to azeotropic distillation in a solvent dehydration tower; acetic acid can be extracted from the tower bottoms; the condensed liquid from the tower top is separated, the oil phase and water phase go through a azeotropic agent refining tower and a methyl acetate recycling tower to separate methyl acetate and then flow back to the solvent dehydration tower; the top part of the solvent dehydration tower is provided with an oil phase reflux device, the upper part and the lower part of the solvent dehydration tower are both provided with a water phase reflux device; through adjusting the water phase reflux amount of the water phase reflux device arranged on the upper part of the solvent dehydration tower, the oil phase reflux amount can be reduced, thus the energy consumption of the solvent dehydration tower is reduced; the water phase reflux device arranged on the lower part of the solvent dehydration tower can bring the azeotropic agent in the lower part of the solvent dehydration tower to the upper part, and thus the phenomenon that the azeotropic agent is mixed with the condensed acetic acid in the tower kettle of the solvent dehydration tower is avoided, so the content of acetic acid that is returned to the oxidation system is stable.