Selective hydrogenolysis integrated with cracking

A process for producing olefins comprising:

• (a) introducing a butane feed stream and hydrogen to a hydrogenolysis reactor to produce a hydrogenolysis product stream, wherein the hydrogenolysis reactor comprises a hydrogenolysis supported bimetallic catalyst, wherein the hydrogenolysis bimetallic supported catalyst comprises Pt and Ir supported on ZSM-5, wherein the hydrogenolysis reactor is characterized by a temperature of less than about 330° C., wherein the hydrogenolysis reactor is characterized by an i-butane conversion of less than about 25%, wherein the hydrogenolysis reactor is characterized by a n-butane conversion of equal to or greater than about 90%, wherein the butane feed stream comprises n-butane and i-butane, wherein the butane feed stream is characterized by a mole ratio of n-butane to i-butane of equal to or greater than about 1:1, and wherein the hydrogenolysis product stream comprises hydrogen, methane, ethane, propane, and i-butane;
• (b) feeding at least a portion of the hydrogenolysis product stream and hydrogen to a hydrocracking reactor to produce a hydrocracking product stream, wherein the hydrocracking reactor comprises a hydrocracking catalyst, wherein the hydrocracking reactor is characterized by a temperature of equal to or greater than about 350° C., wherein the hydrocracking product stream comprises hydrogen, methane, ethane, propane, i-butane, optionally C5 hydrocarbons, and optionally C6+ aromatic hydrocarbons, and wherein the amount of ethane in the hydrocracking product stream is greater than the amount of ethane in the hydrogenolysis product stream;
• (c) separating at least a portion of the hydrocracking product stream in a separation unit into a first hydrogen stream, a first methane stream, a first C2+ gas stream, a butane stream, and optionally a C5+ stream, wherein the first C2+ gas stream comprises ethane and propane, wherein the butane stream comprises i-butane, and wherein the C5+ stream comprises C5 hydrocarbons, and optionally C6+ aromatic hydrocarbons;
• (d) feeding at least a portion of the first C2+ gas stream to a gas steam cracker furnace to produce a steam cracker product stream, wherein the steam cracker product stream comprises olefins, wherein the amount of olefins in the steam cracker product stream is greater than the amount of olefins in the first C2+ gas stream, and wherein the olefins comprise ethylene and propylene in a weight ratio of ethylene to propylene of equal to or greater than about 5:1;
• and
• (e) recycling at least a portion of the butane stream to the hydrocracking reactor;
• recycling at least a portion of the first hydrogen stream to the hydrogenolysis reactor and/or the hydrocracking reactor;
• or both.