自秋转对 #忧 Petroleum Refining ■Cracking >converts high molecular weight hydrocarbons to more useful,low molecular weight ones ■Reforming >increases branching of hydrocarbon chains >branched hydrocarbons have better burning characteristics for automobile enginesPetroleum Refining ◼Cracking ➢converts high molecular weight hydrocarbons to more useful, low molecular weight ones ◼Reforming ➢increases branching of hydrocarbon chains ➢branched hydrocarbons have better burning characteristics for automobile engines