A new CO_2 capture and utilization technology for coal-based methanol process was proposed. In this technology

high concentration CO_2 is directly separated from the sulfur-free medium pressure methanol enriched liquid through compression

so the capture process is simplified

the adsorption drying devices such as molecular sieve or desalted water is unnecessory

and no waste discharges. By Aspen Plus software

the stable state model of this novel sulfur free methanol enriched liquid direct decarbonation technology is established

and the operation parameters are compared with the actual data of the conventional low temperature distillation decarbonization process. The simulation results show that

compared with the conventional process

the CO_2 production capacity of the new technology increases by 20%

and the capture efficiency reaches higher than 88%. For per ton CO_2 captured

the power consumption and water consumption decreases by 20% and 60%

and the capture cost reduces by 30%. The new CO_2 capture technology has broad development prospect

which can be applied in the coal and petrochemical industry.