Method for refining accelerant M(2-mercaptobenzothiazole) through reverse separation method

The invention provides a method for refining an accelerant M(2-mercaptobenzothiazole) through a reverse separation method. The method comprises the steps: coarse M and a mixed solvent constituted by asolvent A solution and a solvent B solution are added into a dissolving device, the temperature is increased and kept to be 60-80 DEG C, stirring dissolving is conducted for 0.5-2 h, then stirring isstopped, heat-preservation precipitating is conducted for 10 min or above, a bottom valve of the dissolving device is opened to separate resinous impurities, and a solution subjected to impurity separation is placed into a separating device; and after the solution enters the separating device, heat preservation is conducted at 60-80 DEG C, a separating agent, namely turkey red oil is added, a solvent B is added for the first time, a mixture reacts for 20 min or above, still standing is conducted for 10 min, the bottom valve is opened, the resinous impurities are discharged, then stirring is started, the solvent B is a