Abstract Natural gas sweetening using methyldiethanolamine (MDEA) solution requires a specific and accurate technique for quantifying organic degraded products and their removal to overcome operating problems such as corrosion and foaming issues. Some of the techniques presently available are gas chromatography, liquid chromatography, and proton-transfer-reaction with mass spectrometry. However, these analytical methods require extensive sample preparation, standards, and long analysis time. The present work aimed at developing an analytical technique using Direct Sample Analysis Time of Flight (DSA-TOF) mass spectrometry for quantifying the degradation products in the industrial grade lean MDEA solution. This technique involves instant sample introduction, rapid analysis, and offers immediate results. The DSA and TOF parameters were optimized to quantify the degraded products accurately. The high correlation coefficient (obtained for the calibration of different wt. % diethanolamine (DEA) in 50 wt. % MDEA solution justified the accuracy of the developed method. Finally, the removal of these organic degraded products were carried out using batch and column adsorption experiments. Carbon impregnated on calcium alginate (CAC) bio-polymer was used as an adsorbent to remove the degraded products. Thus, the method developed using DSA-TOF provided the basis to quantify the degraded products and the CAC adsorbent easily removed the contaminants from the lean MDEA solution.

中文翻译：

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使用自动直接样品分析质谱法快速定量甲基二乙醇胺溶液中的降解产物及其去除

摘要 使用甲基二乙醇胺 (MDEA) 溶液进行天然气脱硫需要特定且准确的技术来量化有机降解产物及其去除，以克服腐蚀和起泡问题等操作问题。目前可用的一些技术是气相色谱法、液相色谱法和质子转移反应与质谱法。然而，这些分析方法需要大量的样品制备、标准和较长的分析时间。目前的工作旨在开发一种使用直接样品分析飞行时间 (DSA-TOF) 质谱法来量化工业级贫 MDEA 溶液中降解产物的分析技术。该技术涉及即时样品引入、快速分析并提供即时结果。优化 DSA 和 TOF 参数以准确量化降解产物。高相关系数（用于校准 50 wt. % MDEA 溶液中不同重量百分比的二乙醇胺 (DEA) 证明了所开发方法的准确性。最后，使用批量和柱吸附去除这些有机降解产物实验。碳浸渍在海藻酸钙 (CAC) 生物聚合物上作为吸附剂去除降解产物。因此，使用 DSA-TOF 开发的方法为量化降解产物提供了基础，CAC 吸附剂可以轻松去除污染物。精益 MDEA 解决方案。% MDEA 溶液证明了所开发方法的准确性。最后，使用分批和柱吸附实验去除这些有机降解产物。浸渍在海藻酸钙 (CAC) 生物聚合物上的碳用作吸附剂以去除降解产物。因此，使用 DSA-TOF 开发的方法为量化降解产物提供了基础，CAC 吸附剂可以轻松去除贫 MDEA 溶液中的污染物。% MDEA 溶液证明了所开发方法的准确性。最后，使用分批和柱吸附实验去除这些有机降解产物。浸渍在海藻酸钙 (CAC) 生物聚合物上的碳用作吸附剂以去除降解产物。因此，使用 DSA-TOF 开发的方法为量化降解产物提供了基础，CAC 吸附剂可以轻松去除贫 MDEA 溶液中的污染物。