Sulfuric acid removing tower for producing biodiesel

The utility model discloses a sulfuric acid removing tower for producing biodiesel, which comprises a tower body and a circulating device. The tower body is provided with a methanol inlet and a methanol outlet. An alkali liquor region for containing alkali liquor is arranged at the bottom of an inner cavity of the tower body. The alkali liquor in the alkali liquor region enters the inner cavity at the upper end of the tower body from an alkali liquor inlet at the upper end of the tower body and returns to the alkali liquor region. The methanol inlet is arranged above the alkali liquor region and below the alkali liquor inlet. The methanol outlet is positioned above the alkali liquor inlet of the tower body. Vapor-phase methanol carrying sulfuric acid droplets moves from bottom to top; the alkali liquor moves from top to bottom; after the vapor-phase methanol and the alkali liquor are mixed, sulphuric acid is adsorbed by the alkali liquor and generated sulfate is settled at the bottom of the tower. Due to the