New Reactive Extraction Based Reclaiming Technique for Amines Used in Carbon Dioxide Capture Process from Industrial Flue Gases

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• 作者：Phattara Akkarachalanont ; Chintana Saiwan ; Teeradet Supap ; Raphael Idem ; Paitoon Tontiwachwuthikul
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：May 4, 2016
• 年：2016
• 卷：55
• 期：17
• 页码：5006-5018
• 全文大小：629K
• 年卷期：0
• ISSN：1520-5045

文摘

A new reclaiming technique based on reactive extraction for removal of heat stable salts (HSS) from monoethanolamine (MEA) used in carbon dioxide (CO₂) capture process has been developed. The extraction process was based on the use of tri-n-octylamine (TOA), Aliquat 336, OH^– modified Aliquat 336, a two-step extraction (modified Aliquat followed by TOA), and mixed extractant (modified Aliquat and TOA) in 1-octanol diluent. The best parameters were 69% OH^– modified Aliquat, two-step extraction, and mixed extractant (modified Aliquat and TOA) and under optimum extraction conditions were able to improve the extraction efficiency of the original Aliquat and TOA to over 90%. The two-step extraction and mixed extractant were also capable of managing Cl^– contamination in MEA solution. Extraction was found to be independent of temperature whereas efficiency reduced with increase of CO₂ loading. Therefore, it is recommended to apply this extraction technique to the lean MEA stream after the rich/lean heat exchanger either with or without cooling. Regeneration of used extractant (OH Aliquat) was implemented and optimized with the use of 4 kmol/m³ NaOH. In addition to HSS removal, the new extraction technique was also able to remove major nonionic degradation products also by up to 90%.