分子筛吸附剂对不同类型柴油吸附分离性能的研究  

Study on adsorption and separation performance of molecular sieve adsorbents for different types of diesel

作　　者：赵闯 陈自浩 张博宇 李犇 靳凤英 李滨 孙振海 郭春垒 ZHAO Chuang;CHEN Zihao;ZHANG Boyu;LI Ben;JIN Fengying;LI Bin;SUN Zhenhai;GUO Chunlei(CenerTech Tianjin Chemical Research and Design Institute Co.,Ltd.,Tianjin 300131,China)

机构地区：[1]中海油天津化工研究设计院有限公司,天津300131

出　　处：《无机盐工业》2024年第3期80-85,共6页Inorganic Chemicals Industry

基　　金：大型芳烃吸附分离成套技术开发与工业化应用项目(CNOOC-KJ 145 ZDXM 12 TJY 015 TJY 2021)。

摘　　要：采用离子交换法制备分子筛吸附剂,分析发现分子筛吸附剂的孔结构以晶内微孔为主,并含有晶间介孔,具有结晶度高、晶粒分布均匀、弱酸和强酸协同作用的特点。以不同类型柴油为吸附原料和轻型解吸剂(沸点低于柴油),利用模拟移动床分离装置,考察分子筛吸附剂对不同类型柴油的吸附分离性能。结果显示:在吸附温度为120℃、压力为1.2 MPa、吸附区回流比为0.5~1.5、精制区回流比为0.2~1.5、解吸区回流比为2.0~6.0、隔离区回流比-2~0的条件下,分子筛吸附剂在不同类型柴油吸附-脱附体系下运行稳定,芳烃产品中芳烃纯度>95%,非芳烃产品中非芳烃纯度>95%;不同类型柴油中硫氮含量、馏程轻重和芳烃含量对吸附分离效果没有影响,不同类型柴油中芳烃含量越高,解吸剂与柴油体积比越高,在模拟工业应用条件下,分子筛吸附剂稳定运行时间超过600 d,所制得的分子筛吸附剂具有芳烃选择性高、吸附容量大、运行稳定性高等特点。The molecular sieve adsorbent was prepared by using ion exchange method,the characterization results of the molecular sieve adsorbent showed that,the pore structure of molecular sieve adsorbents was mainly composed of intracrystalline micropores and intergranular mesopores,with the characteristics of high crystallinity,uniform grain distribution,and synergistic effect of weak and strong acids.Different types of diesel oil were used as raw materials of adsorption,the desorption agent was a lightweight desorption agent(with a boiling point lower than diesel),by using the simulated moving bed,investigating on the adsorption and separation performance of molecular sieve adsorbents for different types of diesel fuels.The result showed that,when the adsorption temperature was 120℃and the pressure was 1.2 MPa,reflux ratio of adsorption zone was 0.5~1.5,reflux ratio of refining zone was 0.2~1.5,reflux ratio of desorption zone was 2.0~6.0,reflux ratio of isolation zone was-2~0,molecular sieve adsorbents operated stably under different types of diesel adsorptiondesorption systems,the aromatics content of the aromatics product was more than 95%,nonaromatic content of nonaromatic product was more than 95%.Sulfur and nitrogen content,distillation range light and heavy and hydrocarbon composition in different types of diesel oil had no effect on separation purity.The higher the aromatics content in different types of diesel fuel,the higher volume ratio of desorption agent to diesel fuel.Under simulated industrial application conditions,the molecular sieve adsorbent run stably for over 600 d.Therefore,it could be seen that molecular sieve adsorbents had the characteristics of high aromatics selectivity,large adsorption capacity,and high operational stability.

关 键 词：柴油 分子筛吸附剂 解吸剂 模拟移动床 吸附分离 

分 类 号：TQ127.2[化学工程—无机化工]