噻吩硫化物的硝化产物用于模型油中DBT的高效吸附  

Efficient adsorption of DBT from model oil by the nitrified thiophenic sulfides via complexation thereof

作　　者：孙瑞阳 陆颖舟[2] 孟洪[2] 李春喜[1,2,3] SUN Ruiyang;LU Yingzhou;MENG Hong;LI Chunxi(State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China;College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Beijing Key Laboratory of Energy Environmental Catalysis,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029 [2]北京化工大学化学工程学院,北京100029 [3]北京化工大学能源环境催化北京市重点实验室,北京100029

出　　处：《化工学报》2020年第5期2256-2264,共9页CIESC Journal

基　　金：国家自然科学基金项目(21376011)。

摘　　要：吸附是柴油深度脱硫的一种有效方法,其关键是高效吸附剂的研究。以活性炭负载的苯并噻吩(BT)、二苯并噻吩(DBT)、DBTO2、4,6-二甲基DBT(DMDBT)为原料,通过混酸硝化/氧化反应制备了四种炭载吸附剂(NBT/C、NDBT/C、NDBTO2/C和NDMDBT/C),表征了产品的组成和结构,并考察了其吸附脱硫性能。结果表明,吸附剂NDBTO2/C与DBT之间具有较强的络合作用,可形成转荷络合物。NDBTO2/C的吸附等温线符合Langmuir方程,其对模型油中DBT、BT和DMDBT的饱和吸附量分别为87.4、10.6和8.3 mg S·g–1,对实际柴油中DBT的吸附量也高达37.2 mg S·g–1。吸附剂可用甲苯/甲醇溶液洗涤再生,循环使用4次后,其吸附性能仍保持在95%左右。本研究为氧化脱硫或吸附脱硫过程中得到的噻吩硫化物混合物的综合利用提供了有益启示。Adsorption is an effective method for deep desulfurizaton of diesel,and the key is the research of high-efficiency adsorbents.In this paper,four activated carbon supported adsorbents(NBT/C,NDBT/C,NDBTO2/C and NDMDBT/C)were prepared by nitrifying the corresponding carbon loaded benzothiophene(BT),dibenzothiophene(DBT),dibenzothiophone(DBTO2)and 4,6-dimethyldibenzothiophene(DMDBT)with mixed acids of H2SO4 and HNO3,their composition and structure were characterized,and their adsorptive desulfurization performance were studied.The results show that there exists a strong interaction between NDBTO2 and DBT,forming a charge transfer complex.The adsorption isotherms of NDBTO2/C follow the Langmuir equation,with its saturated adsorbance being 87.4,10.6 and 8.3 mg S·g–1,respectively for BT,DBT and DMDBT in model oils,and 37.2 mg S·g-1for DBT in real diesel.The used adsorbents can be regenerated easily by toluene/methanol washing,and 95% adsorptivity can be remained after four recycles.This study provides useful inspiration for the comprehensive utilization of thiophene sulfide mixtures obtained during oxidative desulfurization or adsorption desulfurization.

关 键 词：吸附剂 分离 配合物 电荷转移 燃料油脱硫 硝化二苯并噻吩砜 

分 类 号：TQ028.3[化学工程]