Preparation method of coal-based granular activated carbon with molecular sieving effect and application thereof in pressure-transformation adsorption and separation concentrated gas

The invention relates to a preparation method of coal-based granular activated carbon with molecular sieving effect and an application thereof for concentrating strongly adsorptive components of methane, carbon dioxide, and the like in mixed gas with methane and carbon dioxide by a direct deflating step and an inverse vacuum pumping step. The preparation method of coal-based granular activated carbon comprises the following steps: (a) pulverizing coal; (b) adding adhesives of coal tar, and the like into coal powder, and evenly mixing by adding water; (c) molding cylindrical granules, and drying; (d) carbonizing the molded cylindrical granules under nitrogen protection; (e) activating the carbonized cylindrical granules by vapor under the nitrogen protection; and (f) cooling the carbonizedcylindrical granules at room temperature, cleaning by water, and drying after the carbonized cylindrical granules are discharged. The prepared coal-based granular activated carbon has low cost, low pollution ...