In-Line Monitoring of the CO2, MDEA, and PZ Concentrations in the Liquid Phase during High Pressure CO2 Absorption

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• 作者：Alexandr Kachko ; Leen V. van der Ham ; Daphne E. Bakker ; Annemieke van de Runstraat ; Michiel Nienoord ; Thijs J. H. Vlugt ; Earl L. V. Goetheer
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：April 6, 2016
• 年：2016
• 卷：55
• 期：13
• 页码：3804-3812
• 全文大小：473K
• ISSN：1520-5045

文摘

This article provides results of the in situ monitoring of carbon dioxide (CO₂) removal under high pressure. An aqueous solution of methyldiethanolamine (MDEA) promoted by piperazine (PZ) for absorption rate acceleration was used. This system is promising for natural gas purification. A predictive statistical model was built using the chemometrics method and measurements of density, pH, conductivity, sound velocity, refractive index, and Near Infra-Red (NIR) spectroscopy. The CO₂ capture rate ranged from 60% up to 96% at pressures in the absorber column ranging between 15 and 20 bar. The liquid stream composition was monitored at the low pressure part of a pileline at a location before a compressor stage. The concentrations of MDEA, PZ, and CO₂ were predicted in-line using different sets of the measurement devices during 3 days of the measurement campaign. The developed approach allowed for prediction of the concentrations with accuracies of 0.7% for MDEA, 0.4% for PZ, and 2.5% for CO₂.