生物醇醚在炼油-汽油池中的价值工程研究

Study on value engineering of bio-ethanol/ether in oil refining/gasoline pool of China

生物醇醚在中国清洁汽油发展中的价值分析表明,与单位乙醇直接掺混相比,乙醇醚化(TAEE)可取得2.5倍的降烯烃效应,可通过醚化反应和雷德蒸汽压平衡导入较高辛烷值的廉价FCC轻组分获得15倍的汽油池相对增量,相对于90#汽油其抗爆指数的相对增量可达2.5倍,乙醇醚化转化总量是提升清洁汽油价值的关键。结合乙基叔烷基醚制备价值分析提出的改进复合精馏-萃取新工艺,在允许添加过量乙醇以提高醚化转化率的同时,还可集成利用ETBE/乙醇耦合分离的杠杆平衡作用,节省约75%的乙醇增浓回收能耗,并联产获得醚化反应所需的无水乙醇,从而可对生物醇醚燃料发展以及炼油-汽油池价值提升产生积极的杠杆效应。

Through value analysis of bio-ethanol/ether in clean gasoline developing, it indicated that, compared to direct blending, ethanol etherification （TAEE） could lead 2.5 times effects of olefin reduction, and by introducing FCC light components with higher octane numbers and lower cost through etherification and RVP balance, 15 times relative increment of gasoline pool and 2.5 times relative increment of AKI could be achieved. So the key of raising the value of clean gasoline would be etherification and conversion totality of ethanol. A novel process of composite distillation extraction was suggested by combining with the value analysis of ethyl tert-alkyl ether preparation, which would allow adding excess anhydrous ethanol to raise the conversion of the etherification reaction and could reduce energy consumption by 75% for ethanol concentration recovery by integrating with ETBE/ethanol coupling separation, while, the recovered anhydrous ethanol could be returned to the etherification reactor that would has a positive leverage in developing bio-ethanol/ether fuel and raising oil refining/gasoline pool value.