我国自70年代以来先后引进建成了燕山、扬子、齐鲁、大庆、吉化、上海金山和广东茂名等7套年产30万t乙烯和一批中小乙烯装置。目前，全国共有乙烯装置18套，1997年产量已达到370万t，1994年燕山石化公司将年产30万t的乙烯装置改扩建为45万t取得成功。1997年该装置的产量突破51 Since the 1970s, China has successively introduced 7 sets of ethylene with an annual output of 300,000 tons and a batch of small and medium-sized ethylene plants in Yanshan, Yangtze, Qilu, Daqing, Jilin, Shanghai Jinshan and Maoming, Guangdong. At present, there are 18 sets of ethylene plants across the country. In 1997, the output reached 3.7 million tons. In 1994, Yanshan Petrochemical Company successfully modified and expanded the 300,000-ton ethylene plant to 450,000 tons. In 1997, the output of the device exceeded 51