芳烃抽提装置环丁砜劣化问题分析及应对措施  

Analysis and countermeasures of sulfolane deterioration of aromatics extraction unit

作　　者：刘超华 范渺 Liu Chaohua;Fan Miao(CNOOC Huizhou Petrochemical Co.,Ltd.,Huizhou,Guangdong 516086)

机构地区：[1]中海油惠州石化有限公司,广东省惠州市516086

出　　处：《炼油技术与工程》2020年第10期22-25,共4页Petroleum Refinery Engineering

摘　　要：中海油惠州石化有限公司(350+700)kt/a芳烃抽提联合装置中的重整脱戊烷油抽提单元,在掺炼携带溶解氧的裂解加氢汽油情况下,溶剂环丁砜劣化开环生成SO 2,进而形成腐蚀性较强的酸,导致溶剂pH值下降较快,对其原因进行了分析并提出了应对措施。芳烃抽提工艺原料指标要求溶解氧质量分数不大于1μg/g,受溶解氧分析方法的限制,在实际生产中无法准确监控进料中溶解氧含量。重整油抽提单元因掺炼含溶解氧的裂解加氢汽油,溶剂pH值多次低于8且单乙醇胺用量大幅增加,每月用量高达132 kg。结合生产实际针对环丁砜劣化、pH值下降等原因逐一分析,提出控制操作温度、防止溶剂中氯离子富集及定期检查原料罐氮封等减缓环丁砜劣化的措施。In the reforming depentanizer oil extraction unit of the(350+700)kt/a aromatics extraction unit of CNOOC Huizhou Petrochemical Co.,Ltd.,the solvent sulfolane degrades and ring opens to form SO 2,which then forms corrosive acid,resulting in the rapid decrease of solvent pH value.The reasons are analyzed and countermeasures are put forward.The feedstock index of aromatics extraction process requires that the dissolved oxygen content should not be greater than 1μg/g.Due to the limitation of dissolved oxygen analysis method,it is impossible to accurately monitor the dissolved oxygen content in the feedstock in actual production.Because of blending cracked hydrogenated gasoline with dissolved oxygen in reformate extraction unit,the pH value of sulfolane is lower than 8 for many times and monoethanolamine consumption is increased significantly as the monthly consumption is up to 132 kg.Combined with the actual production,the reasons of sulfolane deterioration and pH value decrease are analyzed one by one.The measures to slow down the deterioration of sulfolane are put forward,such as controlling the operating temperature,preventing chloride ion enrichment in solvent and regularly checking the nitrogen sealed feedstock tank.

关 键 词：芳烃抽提装置 环丁砜 PH值 温度 氯离子 氧气 裂解加氢汽油 

分 类 号：TQ241[化学工程—有机化工]