催化裂化汽油馏分切割作连续重整原料生产芳烃  

Catalytic cracking gasoline fraction cutting as continuous reforming feedstock for producing aromatics

作　　者：马致远 王辉 王文辰 刘美静 张海洪 MA Zhi-yuan;WANG Hui;WANG Wen-chen;LIU Mei-jing;ZHANG Hai-hong(ZhongJie Petrochemicals Co Ltd,CNOOC,Cangzhou 061101,China;Chemical&New Material Science Research Institute Co Ltd,CNOOC,Beijing 102209,China;Heavy Oil Processing Engineering&Technology Research Center Co Ltd(Qingdao),CNOOC,Qingdao 266500,China)

机构地区：[1]中海石油中捷石化有限公司,河北沧州061101 [2]中海油化工与新材料科学研究院,北京102209 [3]中海油(青岛)重质油加工工程技术研究中心有限公司,山东青岛266500

出　　处：《石化技术与应用》2023年第6期456-460,共5页Petrochemical Technology & Application

基　　金：中海石油炼化有限责任公司基金资助项目(项目编号:LHTISA 20170032)。

摘　　要：中海石油中捷石化有限公司针对60万t/a芳构化装置重整单元原料供应紧张,同时公司催化汽油富余且销售市场低迷的困境,进行了催化加氢汽油切割出中馏程段(75~165℃)馏分及预加氢精制工艺技术改造,掺炼补充于重整原料,以保障效益较大的芳烃生产。运行及标定结果表明:多产异构烷烃(MIP)工艺所产催化汽油中的硫、氮、烯烃、砷等含量均显著高于直馏石脑油的,不能直接掺炼作为连续重整原料;经工艺技术改造后,所得中馏程段催化汽油切割馏分在新增切割塔的馏出比例为75.1%,在新增预加氢反应器混合连续重整进料中的掺炼比例为25.4%,其芳潜质量分数低于全直馏石脑油3.6个百分点;在重整单元混合进料的74%负荷下,加氢精制石脑油产品芳潜质量分数为41.0%,与主要产品相关设计指标相比较,混合二甲苯收率提升了1.64个百分点,而苯、甲苯、C≥9混合重芳烃、总芳烃收率分别降低了0.84,0.34,2.50,2.04个百分点。不仅解决了直馏石脑油原料供应不足情形下的连续重整单元较高负荷运行及畅销收益高的芳烃生产,还有利于催化汽油产品销售市场低迷情况下的装置经济效益最大化。In response to the situation of the shortage of raw materials supply for reforming units,as well as the surplus catalytic gasoline and the sluggish sales market,the technological transformation of catalytic hydrogenation gasoline cutting into mid-range fractions(75-165℃)and prehydrogenation refining process were carried out in the 600 kt/a aromatization unit of Zhongjie Petrochemical Co Ltd,CNOOC,then the blending was supplemented to reforming raw materials to ensure the aromatic hydrocarbon production with greater economic benefits.The operation and calibration results showed that the content of sulfur,nitrogen,olefins and arsenic in the catalytic gasoline produced by the maximizing iso-paraffins(MIP)process was significantly higher than that of straight run naphtha,so it could not be directly blended as the continuous reforming feedstock.After the technological transformation,the distillation rate of the mid-range catalytic gasoline cut fraction in the new cutting tower was 75.1%,and the blending proportion to the mixture of continuous reforming feed in the new prehydrogenation reactor was 25.4%,and its potential aromatic mass fraction was 3.6 percentage points lower than that of full straight run naphtha.Under 74%load of the mixed feed of reforming unit,the potential aromatic mass fraction of hydrotreated naphtha product was 41.0%.Compared with the relevant design indicators of main products,the mixed xylene yield increased by 1.64 percentage points,yet the yield of benzene,toluene,the mixed C≥9 heavy aromatouldics and the total aromatics decreased by 0.84,0.34,2.50,2.04 percentage points,respectively.Not only could the high load operation of the continuous reforming unit and the production of well-selling aromatics be solved expediently in the case of under the situation of insufficient supply of straight run naphtha feedstock,but also helped to maximize the unit economic benefits under the situation of depressed sales market of catalytic gasoline products.

关 键 词：催化裂化汽油 馏程切割 连续重整原料 芳烃 芳潜质量分数 脱氮脱砷 

分 类 号：TE624[石油与天然气工程—油气加工工程]