TY - BOOK AU - Zai-Ting,Li AU - Chao-Gang,Xie AU - Chao-Gang,Xie ED - World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro, Brasil) TI - Olefin production technology with adjustable propylene/ethylene ratio by catalytic cracking route U1 - CD W938 2 0013940 ER -