正丁烷异构化与烷基化联合对汽油调合的积极作用  

Significance of integration of normal butane isomerization with alkylation for gasoline blending

作　　者：刘娜娜 张励 张晓光 

机构地区：[1]中国石油建设集团公司华东设计分公司,山东省青岛市266071

出　　处：《炼油技术与工程》2013年第9期1-4,共4页Petroleum Refinery Engineering

摘　　要：国外某炼油厂项目在禁用甲基叔丁基醚(MTBE)和目标市场产品标准部分指标严于欧Ⅴ标准的情况下,汽油调合过程遇到了辛烷值低、芳烃含量高和雷德蒸汽压超标等问题。在研究了汽油调合组分的结构和性质后发现,需要辛烷值高、清洁、蒸汽压低的调合组分来改善产品质量,据经验判断烷基化油可能是一个理想的选择。设计人员通过分析烷基化的利好作用推测出做大烷基化装置可以更好地改善汽油产品质量。鉴于该项目禁用MTBE造成丁烯过量,因此建议实施正丁烷异构联合烷基化方案来扩大烷基化规模以增产烷基化油。利用轻烃回收装置的混合C4以及烷基化装置未反应完的正丁烷进行异构化处理,来增加异丁烷产量以提高烷烯比。该方案的实施,很好地改善了汽油产品的质量,使辛烷值提高了0.59,芳烃体积分数降低了7.23%,蒸汽压降低了1.86 kPa。同时,也充分利用了正丁烷和丁烯这些宝贵的C4资源,提高了产品的附加值。In an overseas refinery where MTBE is forbidden to be blended into gasoline and some gasoline specifications are more stringent than Euro-V specifications in target market,the gasoline octane number,aromatics and RVP are off-specifications.Therefore,the clean blending components of high octane and low RVP are required to improve the gasoline quality,and alkylate is a satisfactory selection based upon experience.The study by the designers has found that the operation of a large alkylation unit can improve the gasoline quality.As the MTBE is forbidden in the project and MTBE is in surplus supply an integration process of normal butane isomerization and alkylation is recommended to increase the production of high-octane alkylate.The mixed C4s and unreacted normal butanes from alkylation unit are sent to isomerization unit for treatment to increase the iso-butane production so as to raise the paraffin to olefin ratio.The implementation of this process has greatly improved the product gasoline quality.The octane number of gasoline is increased by 0.59,aromatic content is decreased by 7.23 ％ and vapor pressure is lowered by 1.86 kPa.

关 键 词：正丁烷异构化 烷基化 汽油调合 

分 类 号：TE626.21[石油与天然气工程—油气加工工程]