Azeotropic system for acetic acid concentration

The utility model relates to the technical field of acetic acid production, in particular to an azeotropic system for acetic acid concentration, which comprises a dilute acetic acid intermediate tank, a heat exchanger and an azeotropic tower, a dilute acetic acid feeding pipe is connected between the dilute acetic acid intermediate tank and the heat exchanger, and a dilute acetic acid feeding pipe is connected between the heat exchanger and the azeotropic tower. The dilute acetic acid feeding pipe is sequentially provided with a first feeding valve, a dilute acetic acid conveying device used for conveying dilute acetic acid from the dilute acetic acid intermediate tank to the azeotropic tower, and at least two filtering devices which are arranged in parallel, and each filtering device comprises a filter and a control valve connected to the feeding end and the discharging end of the filter. By arranging the filtering device, the impurity carrying amount of dilute acetic acid introduced into the azeotropic towe