Molecular investigation into the transformation of recalcitrant dissolved organic sulfur in refinery sour water during stripping process  

作　　者：Yu-Guo Li Chen He Chun-Mao Chen Fan Liu Quan Shi 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China [2]State Key Laboratory of Coal Mining and Clean Utilization,Beijing 100013,China [3]PetroChina Ningxia Petrochemical Company,Yinchuan 750021,Ningxia,China

出　　处：《Petroleum Science》2024年第3期2112-2119,共8页石油科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(42003059);State Key Laboratory of Coal Mining and Clean Utilization(2021-CMCU-KF009);the Science Foundation of China University of Petroleum,Beijing(No.2462023YJRC003)。

摘　　要：Refinery sour water primarily originates from the tops of towers in various units and coker condensate,and cannot be discharged directly to a wastewater treatment plant due to high levels of chemical oxygen demand(COD)and organic sulfur contents.Even after the recovery of H_(2)S from the sour water by the stripping process,the effluent still contains a high concentration of dissolved organic sulfur(DOS),which can have a huge bad influence.While chemical composition of dissolved organic matter(DOM)in refinery wastewater has been extensively studied,the investigation of recalcitrant DOS from sour waters remains unclear.In the present study,chemical composition of sour water DOMs(especially DOS)was investigated using fluorescence spectroscopy(excitation-emission matrix,EEM)and mass spectrometry,including gas chromatography-mass spectrometry(GC-MS)and high-resolution Orbitrap MS.The GC-MS and EEM results showed that volatile and low-aromaticity compounds were effectively removed during the stripping process,while compounds with high hydrophilicity and humification degree were found to be more recalcitrant.The Orbitrap MS results showed that weak-polar oxygenated sulfur compounds were easier to be removed than oxygenated compounds.However,the effluent still contained significant amounts of sulfur-containing compounds with multiple sulfur atoms,particularly in the form of highly unsaturated and aromatic compounds.The Orbitrap MS/MS results of CHOS-containing compounds from the effluent indicate that the sulfur atoms may exist as sulfonates,disulfide bonds,thioethers.Understanding the composition and structure of sour water DOS is crucial for the development of effective treatment processes that can target polysulfide compounds and minimize their impact on the environment.

关 键 词：Molecular transformation Dissolved organic sulfur Stripping process Refinery sourwater Orbitrap MS 

分 类 号：TE624[石油与天然气工程—油气加工工程]