The demethanizer using C3, C4 and C4 + hydrocarbons as the absorbent can be used in the methanol-to-olefine process to reduce the operation with conventional processes of removing methane and other low boiling compounds from low-carbon olefinic process streams using only low temperature distillation And capital costs. By reducing the use of propane, the size and operating costs of the C3 separator can be reduced, thereby providing an economic advantage over conventional applications.