加氢分馏塔增加侧线汽提塔生产-35号低凝柴油方案探讨

SCHEME OF INSTALLING SIDE STRIPPER FOR HYDROGENATION FRACTIONATOR TO PRODUCE-35# LOW POUR POINT DIESEL

塔河炼化公司140万t/a汽柴油混合加氢装置地处新疆,在冬季,生产-35号低凝柴油以往主要采取往-10号低凝柴油中掺入一定比例的航空煤油和降凝剂组分,这样做不仅浪费了航空煤油资源,储运过程中还有可能出现蜡结晶析出状况,影响产品的正常使用。经研究计划改造现有2号加氢分馏塔,使其增加侧线生产-35号低凝柴油,即根据馏程切割实验数据,从加氢分馏塔抽出一股柴油组分送往新增的低凝柴油汽提塔,汽提塔顶气相返回分馏塔,汽提塔底部馏出符合-35号国Ⅴ车用柴油指标的低凝柴油,分馏塔底部产出的柴油作为-10号国Ⅴ车用柴油调和组分出厂售卖。

The 1.4 Mt/a gasoline and diesel mixed hydrogenation unit at SINOPEC Tahe Refining and Chemical Co.Ltd.is located in Xinjiang.In winter,the-35# low pour point diesel was produced mainly by mixing a certain proportion of aviation kerosene and pour point depressant components into the-10# low pour point diesel,which not only wastes the aviation kerosene resources,but also may cause wax crystallization and precipitation during the storage and transportation,thus affecting the use of diesel products.Based on the research,the existing No.2 hydrogenation fractionator is planned to be revamped to directly produce-35# low pour point diesel by side line,i.e.,a share of diesel components is to be extracted from the hydrogenation fractionator and sent to the newly installed low pour point diesel stripper based on the distillation range cutting experimental data,the gas phase at the top of the stripper will return to the fractionator,low pour point diesel conforming to the-35# National V automobile diesel indicators can be produced from the bottom of the stripper,and the diesel from the bottom of the fractionator can be sold as the blending component for-10#National V automobile diesel.