RBN Energy: Oil Refinery Liquified Petroleum Gasses vs Natural Gas Liquids

Even if not interesting in the economics or investing in liquid natural gases, this RBN Energy presentation is highly educational:

Gas plants are not the only producers of NGLs.  Refineries produce liquefied petroleum gasses – LPGs. LPGs include refinery propane, refinery normal butane and refinery isobutane.  And these products are chemically equivalent to the propane and butanes produced by gas plants.   Of total U.S. propane (C3) and butanes (C4) production, refineries produce about 25% on a year-round basis, and more than one-third during the summer.   In a world of increasing supply and flagging demand (that’s the world we are in), it means heads up competition between NGLs and LPGs for end-use markets.