Jan 20 - China Petrochemical Corp. (Sinopec) signed a 20-year agreement with the Australia Pacific coal-seam-gas-to-LNG venture (APLNG) to increase its urchases from 4.3 million tonnes per annum to 7.6 MTPA, starting in 2016. Sinopec also increased its equity participation in APLNG from 15 percent to 25 percent. The stakes of Origin Energy and ConocoPhillips will drop to 37.5 percent because of the latest transaction.








