用于离子色谱系统淋洗液中CO_(2)脱除的气液分离器设计与应用  

Design and application of a gas-liquid separator for the removal of carbon dioxide in the eluent of an ion chromatography system

作　　者：彭勇涵 唐婧雯 李怡桦 章飞芳[1] 杨丙成[1] PENG Yonghan;TANG Jingwen;LI Yihua;ZHANG Feifang;YANG Bingcheng(School of Pharmacy,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学药学院,上海200237

出　　处：《色谱》2025年第4期382-387,共6页Chinese Journal of Chromatography

基　　金：国家自然科学基金(22374046).

摘　　要：设计了一种可用于脱除离子色谱(IC)系统淋洗液中CO_(2)的气液分离器(GLS)。首先将微孔中空纤维聚丙烯管(PP-T)内插到内径适配的聚四氟乙烯管(PTFE-T)中,形成双套管结构并缠绕成螺旋形;随后将PP-T和PTFE-T的两端分别固定于配备了三通接头的两个水平接口处,将再生液管路固定在配备了三通接头的垂直臂接口处。当碳酸根淋洗液从上游抑制器流入PP-T内部时,经抑制作用后的碳酸溶液会分解产生CO_(2)气体,这些气体随后通过PP-T逸出,并进入位于PP-T与PTFE-T之间环状空间内的流动吸收液中,从而实现CO_(2)的持续、有效脱除。实验优化了GLS的制作条件和操作条件,包括PP-T的长度、PTFE-T的内径、操作温度和吸收液的种类、浓度及流速等。实验结果表明,将40 mmol/L的KOH溶液作为吸收液时,在淋洗液流速为1 mL/min的情况下,CO_(2)的脱除效率可达98%以上;较高的操作温度有助于提高CO_(2)的脱除效率并降低基线噪声,本实验优化后的操作温度为40℃。将该GLS应用于碳酸根淋洗液的IC系统,在使用1.8 mmol/L K_(2)CO_(3)-3.2 mmol/L KHCO_(3)(1∶1,v/v)混合淋洗液时,背景电导信号从未使用GLS的41.6 mV降低至使用GLS后的5.5 mV;以150μmol/L常见阴离子(F^(-)、Cl^(-)、NO_(2)^(-)、Br^(-)、NO_(3)^(-)、SO_(4)^(2-))混合标准溶液为标样,使用GLS后的信噪比(SNR)得到了明显提升(6.0~11.8倍)。此外,该GLS还可用于脱除氢氧根淋洗液体系下大体积样品中的CO_(2)(CO_(3)^(2-)的峰面积下降了约80%),降低样品中CO_(3)^(2-)对其他阴离子分离产生的干扰。A gas-liquid separator(GLS)for the removal of carbon dioxide in the eluent of an ion chromatography(IC)system was developed.Firstly,the microporous hollow fiber polypropylene tube(PP-T)was inserted into the polytetrafluoroethylene tube(PTFE-T)with suitable inner diameter to form a double casing structure and wound into a spiral shape.Each terminal of the PP-T is 3 cm longer than that of the PTFE-T.Then the terminals of PP-T and PTFE-T were fixed respectively on two horizontal joints equipped with tee joints,and the regenerated liquid pipeline was fixed on a vertical arm interface equipped with tee joints.When the carbonate eluent flows into PP-T from the upstream suppressor,the inhibited carbonate solution will decompose and produce CO_(2),which then escapes through PP-T and enters the flowing absorption solution located in the annular space between PP-T and PTFE-T,so as to achieve continuous and effective CO_(2)removal.The production conditions and operating conditions of GLS were optimized,including the length of PP-T,the inner diameter of PTFE-T,the operating temperature,the type,concentration and flow rate of the absorption solution.The experimental results show that when 40 mmol/L potassium hydroxide solution is used as absorption solution,the removal efficiency of CO_(2)can reach more than 98%at the flow rate of 1 mL/min.Higher operating temperature is helpful to improve the removal efficiency of CO_(2)and reduce the baseline noise.The optimized operating temperature in this study was 40℃.When applying this GLS to the IC system for carbonate eluent,using a mixed eluent of 1.8 mmol/L potassium carbonate-3.2 mmol/L potassium bicarbonate(1∶1,v/v),the background conductance signal decreased from 41.6 mV without GLS to 5.5 mV after using GLS.Using a mixed standard solution of common anions(F^(-)、Cl^(-)、NO_(2)^(-)、Br^(-)、NO_(3)^(-)、SO_(4)^(2-))at 150μmol/L as the reference sample,the signal-to-noise ratio(SNR)after applying the GLS has been significantly improved by a factor of 6.01 to 11.8 times.I

关 键 词：离子色谱 气液分离器 CO_(2)脱除 阴离子分析 抑制器 

分 类 号：O658[理学—分析化学]