氮化物和稠环芳烃对页岩油催化裂化的阻滞作用

Retardation of nitrogen compounds and condensed aromatics on shale oil catalytic cracking process

以页岩油(试样A)为原料,在常温、常压下,分别经盐酸溶液和盐酸-糠醛溶液萃取,可得试样B和试样C。于微反装置中,在反应温度为520℃,催化剂/原料油(质量比)为6,质量空速为12 h-1的条件下,对试样的催化裂化性能进行了评价。结果表明,与试样A相比,试样B和试样C的密度、残炭质量分数、相对分子质量和含氮质量分数均降低;试样B和试样C的碱性氮化物脱除率分别为81.1%,88.0%;与试样A相比,试样B的饱和分提高了16.61个百分点,胶质和沥青质下降了16.88个百分点;试样C的饱和分较试样B仅提高2.33个百分点,芳香分降低3.63个百分点。在相同的反应条件下,试样催化裂化性能优劣依下列顺序递减:试样C,试样B,试样A。

The sample B and sample C were pre- pared by HC1 extraction and HCI - furfuraldehyde extraction respectively with shale oil （sample A）as feedstock under the conditions of atmospheric tem- perature and pressure. The catalytic cracking per- formance of three oil samples was evaluated in a fixed bed microreactor at 520 ℃, catalyst to oil mass ratio 6, weight space velocity 12 h-1. The results showed that compared with sample A, the density, carbon residue, relative molecular mass and nitrogen mass fraction of sample B and C decreased. The re- moval rates of basic nitrogen compounds in sample Band C were 81. 1% and 88. 0% , respectively. In contrast with sample A,the saturates in sample B in- creased by 16.61 percent points,the resins and as- phaltenes in sample B decreased by 16.88 percent points. As contrasted with sample B,the saturates in sample C increased by 2.33 percent ＇points,the aro- matics decreased by 3.63 percent points. Under the same conditions, the sequence of catalytic cracking performance from good to bad in all three samples was sample C,sample B,sample A.