Abstract: A 1.2 MM TPY continuous reforming unit of a company was transformed into a new xylene unit to produce xylene products with the gasoline quality upgrading and reducing aromatic content in reformed gasoline. After revamping, the final boiling point of $C_{9}^{+}$ distillate also increased abnormally, reaching about 250 ℃ on average and 260 ℃ at the highest, which did not meet the quality requirements of gasoline. In order to control the product quality of $C_{9}^{+}$ distillate, the abnormal increase of final boiling point was analyzed. The reason is that the olefin in reformed gasoline are alkylated in clay pot to form heavy aromatics with high boiling point. A new full-fraction liquid-phase hydrogenation reactor was added to hydrogenate olefins in saturated gasoline to eliminate the abnormal phenomenon.

Key words: CCR, gasoline, final boiling point, olefins, clay, alkylation reaction

摘要： 某公司1.2 Mt/a连续重整装置为配合汽油质量升级,降低重整汽油中芳烃含量,在原有装置上改造新增二甲苯单元,产出二甲苯产品。重整装置改造后, $C_{9}^{+}$馏分油的终馏点异常升高,平均为250 ℃左右,最高时达到260 ℃,使汽油产品不符合质量要求。为控制$C_{9}^{+}$馏分油的产品质量,对其终馏点异常升高的原因进行分析。确定原因为重整汽油中烯烃在白土罐内发生烷基化反应,生成高沸点重芳烃。新增全馏分液相加氢反应器,加氢饱和汽油中的烯烃后,消除了异常现象。

关键词: 连续重整, 汽油, 终馏点, 烯烃, 白土, 烷基化反应