Abstract: Based on the improved front-end deethanizer process, the methanol to propylene (MTP) demethanizer exhaust recovery process was discussed with intercooled oil direct absorption method and cold oil supplement reflux. The simulation indicates that cold oil supplement reflux can effectively recycle the absorbent and ethylene from the deethanizer exhaust, and cut down the duty of product gas compressor and propylene refrigeration compressor. Taking 1.7×10⁶ t/a MTP device for an example, for inter cooled oil direct absorption method, C₂H₄ loss of demethanizer exhaust is 48 t/a, absorber loss is 2 104 t/a and dual compressor power consumption is about 20 537 kW. Meanwhile, for cold oil supplement reflux method, C₂H₄ loss of demethanizer exhaust is 38 t/a, absorber loss is 410 t/a and dual compressor duty is about 20 549 kW.