自上世纪90年代末中国进入重化工时代以来,国内化工品需求不断增大,乙烯原料及其下游化工品的对外依存度呈现不断攀升态势。2003年以后,这种依赖进口维系发展的情况愈发严重,虽然上世纪90年代末上马的一批乙烯项目,如南京扬子石化巴斯夫(简称扬巴)60万吨乙烯项目、上海赛科90万 Since China entered the era of heavy chemical industry in the late 1990s, the domestic demand for chemical products has been constantly increasing, and the dependence on ethylene raw materials and its downstream chemical products is on the rise. Since 2003, the dependence on imports has been growing. Although a number of ethylene projects launched in the late 1990s such as the 600,000-tonne ethylene project of Nanjing Yangzi Petrochemical BASF (Yangba Petrochemical Company) and the 900,000 Shanghai Secco