电渗析离子交换-离子色谱法检测脱硫胺液中的热稳态盐  

Determination of Heat Stable Salts in Amine Solution Used in Desulfurization by Electrodialysis-Ion Exchange Coupled with Ion Chromatography

作　　者：吴述超[1] 胡荣宗[1] 黄维雄[1] 潘丹梅[1] 江宗善[1] 

机构地区：[1]厦门大学化学化工学院化学系教育部现代分析科学重点实验室,福建厦门361005

出　　处：《石油化工》2006年第4期384-388,共5页Petrochemical Technology

基　　金：国家自然科学基金资助项目(20527005)。

摘　　要：设计了一种填有强酸型阳离子交换树脂的电渗析离子交换装置,建立了电渗析离子交换-离子色谱检测脱硫胺液中热稳态盐(HSS)的方法,并分析了其工作原理。含有HSS的胺液流经电渗析离子交换装置后,HSS由胺液介质转换为水介质。HSS 的介质转换及离子交换树脂的再生过程连续进行。电渗析离子交换的较佳实验条件:胺液流量1．0mL／min,电流100mA,胺液循环次数4次,无机阴离子的洗脱液为3．5mmoL／LNa2CO3+1．0mmoL／L NaHCO3,有机阴离子的洗脱液为0．5mmol／LNa2CO3+ 0．5 mmoL／L NaHCO3。在此条件下分析实际试样,得到Cl-,SO42-,HCOO-,CH3COO-,CH3CH2COO-的检测限分别为0．005, 0．020,0．010,0．050,0．080mg／L,加标回收率为81．0％-113．0％。该方法只用水无需采用化学试剂,且简单、快速、灵敏、准确。Novel method for determination of heat stable salts （HSS） in amine solution, used in desulfurization of natural gas and refinery gas, was developed by electrodialysis-ion exchange coupled with ion chromatography. An electrodialyzer packed with strong acidic cation-exchange resin was designed and established. Amine solution containing HSS and methyldiethanolamine （MDEA） flowed through the device, in which MDEA was reserved on the strong acidic cation-exchange resin. HSS whose the resin after exchanging with hydronium ions on medium was converted from MDEA to hydrous phase could be determined by ion chromatography. Conversion of medium and regeneration of ionexchange resins could be continuously carded out without interruption. Under optimal conditions for electrodialysis-ion exchange： flowrate of amine solution 1.0 mL/min, electric current 100 mA, cycle times of amine solution 4, eluent for inorganic anions 3.5 mmoL/L Na2CO3 ＋ 1.0 mmol/L NaHCO3 and eluent for organic anions 0.5 mmol/L Na2CO3 ＋0.5 mmol/L NaHCO3 ,detection limits for Cl^-, SO4^2- ,HCOO^- ,CH3COO^- and CH3CH2COO^- were 0. 005 , 0. 02 , 0. 010 , 0. 050 and 0.080 mg/L, respectively. Recovery of method was 81.0% - 113.0%. The method needed no chemical reagent and was simple, fast, sensitive and precise.

关 键 词：电渗析离千交换 离子色谱 热稳态盐 N-甲基二乙醇胺 胺液 脱硫 

分 类 号：TQ028.72[化学工程]