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我国乙烯工业基本以石脑油为原料,气体原料和重质原料较少。2010年我国乙烯原料的消耗量已达到4170×104t以上,是2004年原料消耗量的1.72倍。世界范围内,50%以上的乙烯产能是用石脑油生产的。我国2010年石脑油占乙烯原料的比例为65.9%(质量分数)。据估算预测,2013年前后我国用于生产乙烯的原油为2.95×108t/a,包括燃料油在内的原油需求量将达到5.90×108～7.375×108t/a,届时原油对外依存度达到64.4%～71.5%。为此,如何减少石脑油的消耗,将是乙烯工业的长期课题。如果把乙烯装置和芳烃抽提装置集成起来,把富含环烷烃和芳烃的劣质石脑油用于生产芳烃,性质改善后的芳烃抽余油用于生产乙烯,扬长避短,物尽其用,可以显著减少合格石脑油的消耗量,减少生产乙烯的原油用量,并具有良好的投资回收期。
Ethylene industry in our country to naphtha as the basic raw materials, gas raw materials and less heavy raw materials. In 2010, the consumption of ethylene raw materials in China reached 4170 × 104t, which is 1.72 times of the consumption of raw materials in 2004. More than 50% of ethylene capacity worldwide is produced from naphtha. China’s naphtha in 2010 accounted for 65.9% of ethylene raw materials (mass fraction). According to the estimation, the crude oil for ethylene production in China will be 2.95 × 108t / a around 2013 and the demand for crude oil including fuel oil will reach 5.90 × 108-7.375 × 108t / a, and the dependence on crude oil will reach 64.4% ~ 71.5%. To this end, how to reduce the consumption of naphtha, ethylene industry will be a long-term issue. If the ethylene unit is combined with the aromatics extraction unit, the inferior naphtha, which is rich in naphthenes and aromatics, is used to produce aromatics, and the aromatised raffinate with improved properties is used to produce ethylene, Significantly reduce the consumption of qualified naphtha, reduce the amount of ethylene production of crude oil, and has a good payback period.