NOVELTY - Butadiene is removed from methanol to olefin reaction product by compressing pretreated methanol to olefin reactants (A) in high pressure depropanization tower (1), distilling, separating, removing light components out from top of production tower, compressing, separating propylene, ethylene, and fuel gas, transferring to low pressure depropanization tower (2), distilling, separating, introducing to bottom of hydrogenation reactor (3), mixing with hydrogenation, performing selective hydrogenation reaction, removing unreacted mixed 4-8 carbon-containing hydrocarbons, and cooling.    USE - Removal of butadiene from methanol to olefin reaction product (claimed).    ADVANTAGE - The removal of butadiene from methanol to olefin reaction product is safe, energy saving, suitable for storage, and has less equipment investment, and increased device efficiency.    DETAILED DESCRIPTION - Butadiene is removed from methanol to olefin reaction product by compressing pretreated methanol to olefin reactants in high pressure depropanization tower, distilling, separating, removing propane and lighter components (B) out from top of production tower, compressing, separating propylene, ethylene, and fuel gas, separating mixed 4-8 carbon-containing hydrocarbons, small amount of propylene, and propane (C) on high pressure depropanization output tank, transferring to low pressure depropanization tower, distilling, separating, removing propylene and propane (D) from top of tower, separating propane, propylene, and mixed 4-8 carbon-containing hydrocarbons (E) on low pressure depropanization output tank, introducing to bottom of hydrogenation reactor, mixing with hydrogenation, performing selective hydrogenation reaction, removing unreacted mixed 4-8 carbon-containing hydrocarbons (F) from top of reactor, and transferring to cooling system.    DESCRIPTION OF DRAWING(S) - The drawing shows a process flow diagram of removal of butadiene from methanol to olefin reaction product.    High pressure depropanization tower (1)    Low pressure depropanization tower (2)    Hydrogenation reactor (3)    Methanol to olefin reactants (A)    Propane and lighter components (B)    Mixed 4-8 carbon-containing hydrocarbons, small amount of propylene, and propane (C)    Propylene and propane (D)    Mixed 4-8 carbon-containing hydrocarbons (E)    Unreacted mixed 4-8 carbon-containing hydrocarbons (F)