Effect of Operating Conditions on Co Absorption into Aqueous Alkanol amine Solutions in Packed Column

  • Saleh E. Najim Engineering College University of Basrah
  • Adnan A. Ateik Basrah Technical College
  • C. K. Haweel Engineering College University of Baghdad
Keywords: operating conditions, carbon dioxide, Amine solution, packed column

Abstract

This paper highlights the importance of operating parameters to mass-transfer in CO

absorption in columns with different packings. The study compares the performance of two
packings, Gempak 4A and Raschig ring. Mass-transfer efficiency of these packings was
determined by carrying out absorption experiments in a pilot-scale absorption unit with
aqueous solutions of monoethanolamine (MEA), Diethanolamine (DEA),2-amino-2-methyl1-propanol
(AMP)
and
methyldiethanolamine
(MDEA)
as
test
solvent.

The
overall
mass-transfer
coefficient
(K
a
G
) can be considered to be indicative of the CO

removal efficiency of the system and can be calculated from experimentally gas-phase CO
v

concentration profiles within the test columns. The results of this study indicate that masstransfer
coefficient
of
these
packings
tested
varies
significantly
not
only
with
operating

parameters
such
as
liquid
load,
liquid
CO
loading, solvent concentration, solvent type and
feed CO
2
2
concentration but also with packing arrangement.
In absorption experiments the results show the typical behavior of liquid controlling
system. Gas flow rate has no influence on overall mass transfer coefficient (KGav), and an
increase in liquid flow rate yields a greater (KGav). CO2 loading lowers the (KGav) and an
increase in amine concentration induces a higher (KGav). Increasing the CO2 concentration
within the feed gas was found to reduce the value of (KGav) within the system.
Structured packing offers superior performance to random packings, structured packing
provides almost twice greater (KGav) than random packings.
2
2
2

Published
2019-04-30
Section
Articles