A method of producing methyl tertiary butyl ether (MTBE) and/or 1-butene, the method comprising: distilling a crude C 4 hydrocarbon stream that comprises n-butane, 1-butene, 2-butene, isobutane, isobutene, and a catalyst deactivating compound comprising dimethylformamide, acetonitrile, n-methyl-2-pyrrolidone, furfural methoxy-propionitrile (MOPN), or combinations thereof, to produce: a distillate stream comprising isobutene, isobutane, and 1-butene; and a bottom stream comprising 2-butene, n-butane, and the catalyst deactivating compound; reacting the isobutene of the distillate stream with methanol in the presence of a catalyst for MTBE synthesis to produce methyl tertiary butyl ether and an unreacted portion of the distillate stream; and separating the methyl tertiary butyl ether from the unreacted portion of the distillate stream, the unreacted portion comprising isobutane and 1-butene; flowing the bottom stream to an olefins conversion technology unit, wherein the olefins conversion technology unit comprises one or more metathesis reactors and one or more separation units; reacting at least some of the 2-butene of the bottom stream with ethylene in the one or more metathesis reactors to form a reaction stream comprising propylene and liquefied petroleum gas; and separating the reaction stream in the one or more separation units to form a propylene stream comprising primarily propylene and an LPG stream comprising n-butane and unreacted 2-butene wherein the distilling of the crude C4 hydrocarbon stream is carried out at a pressure of 3 to 10 bar; wherein the catalyst deactivating compound is capable of deactivating the catalyst for MTBE synthesis. distilling a crude C 4 hydrocarbon stream that comprises n-butane, 1-butene, 2-butene, isobutane, isobutene, and a catalyst deactivating compound comprising dimethylformamide, acetonitrile, n-methyl-2-pyrrolidone, furfural methoxy-propionitrile (MOPN), or combinations thereof, to produce: a distillate stream comprising isobutene, isobutane, and 1-butene; and a bottom stream comprising 2-butene, n-butane, and the catalyst deactivating compound; reacting the isobutene of the distillate stream with methanol in the presence of a catalyst for MTBE synthesis to produce methyl tertiary butyl ether and an unreacted portion of the distillate stream; and separating the methyl tertiary butyl ether from the unreacted portion of the distillate stream, the unreacted portion comprising isobutane and 1-butene; flowing the bottom stream to an olefins conversion technology unit, wherein the olefins conversion technology unit comprises one or more metathesis reactors and one or more separation units; reacting at least some of the 2-butene of the bottom stream with ethylene in the one or more metathesis reactors to form a reaction stream comprising propylene and liquefied petroleum gas; and separating the reaction stream in the one or more separation units to form a propylene stream comprising primarily propylene and an LPG stream comprising n-butane and unreacted 2-butene wherein the distilling of the crude C4 hydrocarbon stream is carried out at a pressure of 3 to 10 bar; wherein the catalyst deactivating compound is capable of deactivating the catalyst for MTBE synthesis.