Method for preparing dibenzenesulfonimide by solvent-free grinding method

The invention relates to a method for preparing dibenzenesulfonimide by a solvent-free grinding method. According to the method, firstly, benzsulfamide and pure benzene sulfonyl chloride are put into a ball mill to be ground, so that the benzsulfamide and the benzene sulfonyl chloride are sufficiently and uniformly mixed at room temperature; then, solid NaOH is fed into the ball mill in different batches; the grinding is continuously performed; the temperature of a reactant is maintained to be lower than 60 DEG C; after the reaction is completed, the reactant is moved out from the ball mill; the reactants are dissolved by organic solvents; filtering is performed for removing generated NaCl; filter liquid is obtained; finally, the filter liquid is subjected to concentration crystallization, filtering and drying; a product is obtained. In the whole reaction process, the solvent is not needed; the environment pollution is reduced; the production cost is reduced. The atom utilization rate of the whole preparation