Method for preparing CO2 adsorbent from oil-coal co-processing residues

The invention discloses a method for preparing a CO2 adsorbent from oil-coal co-processing residues. The method comprises the following steps: 1, extracting oil-coal co-processing residues and an extraction solvent, and carrying out thermal polycondensation on an obtained extraction phase to obtain a hydrothermal carbon precursor; 2, carbonizing the hydrothermal carbon precursor under the protection of inert gas, and completely converting the hydrothermal carbon precursor into black pre-carbide; step 3, mixing and grinding the black pre-carbide and an activating agent KOH, and then performing activating treatment; and step 4, pickling, washing and drying the activated carbide to obtain the porous carbon sphere CO2 adsorbent with high specific surface area. The method has the characteristics of simplicity in operation, mild conditions, low investment and high energy efficiency, petrochemical resources can be reasonably utilized, and recycling of the resources is also realized. 本发明公开了一种油煤共炼残渣制备CO2吸附剂的方法，包括以下步骤；