In-Line Monitoring of the CO2, MDEA, and PZ Concentrations in the Liquid Phase during High Pressure CO2 Absorption
dataset
posted on 2016-03-17, 00:00 authored by Alexandr Kachko, Leen V. van der
Ham, Daphne E. Bakker, Annemieke van de Runstraat, Michiel Nienoord, Thijs J. H. Vlugt, Earl L. V. GoetheerThis
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.
