Purification method for octahydro-1,1'-bi-2-naphtol (H8-BINOL)

The method comprises the steps that the reaction liquid of the 5,5',6,6',7,7',8,8'-octahydro-1,1'-bi-2-naphtol (H8-BINOL) prepared by taking binaphthol as a raw material is introduced into a purification device for purification, exsolution is performed on purified liquid to obtain the 5,5',6,6',7,7',8,8'-octahydro-1,1'-bi-2-naphtol (H8-BINOL) with the content greater than or equal to 99%. The method comprises the steps that the reaction liquid of the (plus or minus)-5,5',6,6',7,7',8,8'-octahydro-1,1'-bi-2-naphtol prepared by taking binaphthol as a raw material is introduced into a purification device for purification, exsolution is performed on purified liquid to obtain the (plus or minus)-5,5',6,6',7,7',8,8'-octahydro-1,1'-bi-2-naphtol with the content of 99% or above. The purification device consists of a condenser pipe (1), ground joints (2), ground clamps (3) and a ground casing pipe (4) with open pores or pore channels, wherein the ground casing pipe is arranged in the condenser pipe for placing inorgani