提高石脑油资源利用率的加工过程优化

Processing optimization for improvement of naphtha resource utilization

通过对石脑油加工现状的分析,找出加工过程中存在的组分分离不精、高效资源未能充分利用、预加氢单元大负荷瓶颈及存储供料等问题,引入分子管理加工理念,对系统关键设备逐一核算,提出流程调整及优化改造措施,从根本上消除现有加工工艺存在的不足,使石脑油组分有效地分离和加工,达到液化石油气和石脑油、戊烷油和精制油、异戊烷和正戊烷等组分之间分割清晰,理想组分的分布合理,真正实现了"宜烯则烯、宜芳则芳、宜油则油"的目标。其中精制油收率由77.9%提高到了83.8%,不适合重整进料的C^-_6组分质量分数仅为0.45%,反应后高价值的氢气、液化石油气及重整生成油产量均有增加,单位效益达3.27万元/h。分离后的戊烷质量分数为99.5%,其中异戊烷,正戊烷质量分数分别为71.0%,28.5%;混合油品辛烷值约84.7,且几乎不含C_4组分及烯烃、芳烃,是应对汽油质量升级的理想调合组分;正戊烷油纯度达83.46%,可作为高品质化工产品。

Through analysis of current status of naphtha processing,the problems of insufficient separation of naphtha components,insufficient utilization of high-value resources,bottleneck in production utilization as well the problems in environmental protection and energy saving in storage are found out.Based upon the concept of molecular process management,the key equipment is calculated one by one,and measures for the adjustment optimization of naphtha processing are proposed.These have fundamentally eliminated the shortcomings of the existing process and made it possible for the effective separation of component of naphtha,the components between liquefied petroleum gas and naphtha,pentane oil and refined oil,iso-pentane and n-pentane,etc.The distribution of desired components is more reasonable,and the objective of ＂the appropriate olefin into olefin,aromatics into aromatics,oil into oil＂have been realized.The yield of refined oil is increased from 77.9% to 83.8%,and the components lighter than C_6 which are not good for the feedstock of catalytic reforming is only 0.45%.The yields of high value hydrogen,liquefied petroleum gas and reformate are increased after reforming reaction.The unit economic benefit has reached 32 700 Yuan（RMB）/ hour.The pentane in iso-pentane oil is 99.5%,and the iso-pentane content is 71%,the n-pentane content is28.5%.The octane number of mixed oil is about 84.7,which contains no C_4 components,olefins and aromatics.It is an ideal blending component for gasoline quality upgrading.The purity of n-pentane oil is83.46%.It is sold as a high quality chemical product.