轻汽油醚化装置在车用汽油质量升级中的作用

The Role of Light FCC Gasoline Etherification Unit in Motor Gasoline Quality Upgrading

轻汽油醚化工艺可将催化轻汽油中的C5~C7叔碳烯烃与甲醇发生反应,生成相应的醚(TAME、TAEE等)。该工艺可有效降低催化汽油中的烯烃含量,将全馏分的催化汽油辛烷值(RON)提高1~2个单位,蒸汽压降低10kPa左右,同时可将低价值甲醇转化成高价值的汽油,提高炼厂经济效益。轻汽油醚化国外技术包括CDEthers工艺、NExTAME工艺、Ethermax工艺、TAME工艺,国内技术包括CATAFRACT工艺、LNE技术。国内某炼油厂国Ⅵ标准车用汽油质量升级方案选用LNE-3轻汽油醚化技术。新增轻汽油醚化装置后,在降低催化轻汽油烯烃含量的同时,可将含醚和不含醚的轻汽油组分分开,便于调和乙醇汽油。LNE-3轻汽油醚化技术满足烯烃含量小于15%(体积分数)的国Ⅵ(B)阶段标准要求,全厂汽油产品全部满足国Ⅵ车用汽油标准要求,且可灵活选择是否生产乙醇汽油。通过本次质量升级,企业汽油产品满足了国家环保要求,市场竞争力提高,经济效益显著。

In the light FCC gasoline etherification process,C5-C7 tertiary carbonic olefins react with methanol to generate the corresponding ethers（TAME,TAEE,etc.）.The technology can effectively reduce the content of olefin in FCC gasoline and increase RON for full-range FCC gasoline by 1-2 units and reduce vapor pressure by about 10 kPa.It can also convert low-value methanol to high-value gasoline,thus increasing revenue for refineries.Foreign light FCC gasoline etherification technologies include CDEthers,NEx TAME,Ethermax and TAME,and domestic technologies include CATAFRACT and LNE.A domestic refinery adopted the LNE-3 light FCC gasoline etherification technology for its national Ⅵ motor gasoline product upgrading program.After the addition of a light FCC gasoline etherification unit,while reducing the content of olefin in gasoline,the refinery can separate ether-containing components from ether-free components,making it easy to blend ethanol gasoline.The LNE-3 light FCC gasoline etherification technology satisfies the national Ⅵ（B） standard in which the olefin content must be lower than 15%（by mass fraction） and all gasoline products produced by the refinery meet the national Ⅵ standard for motor gasoline.It also offers the flexibility of producing or not producing ethanol gasoline.Through this product upgrade,gasoline products produced by the refinery meet national environmental requirements and are more competitive in the market.