Methylal deep dehydration purifying device

The utility model discloses a methylal deep dehydration purifying device which at least comprises two or more adsorption/regeneration towers (A, B), coolers (11, 12), a steam separator (13), a circulating fan (14) and an electric heater (10) and is mainly characterized in that another circulation line is arranged between the tower bottom and the tower top of each adsorption/regeneration tower (A, B); when an adsorption cycle enters later period, liquid in the tower is pumped from the tower bottom to the tower top by the circulation line and circularly passes through a molecular sieve to be adsorbed until the molecular sieve is saturated; the regeneration times of the molecular sieve can be reduced, and the service life is prolonged; and meanwhile, the energy consumption can be saved, and the operation cost of the whole production is lowered. The device disclosed by the utility model can realize deep dehydration of methylal; the water content in the product is less than 50ppm, and the purity exceeds 99.9%; and