Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 12, pp. 1910−1913.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © E. Sendzikiene, V. Makareviciene, R. Ciutelyte, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 12, pp. 2024−2028.
IN HETEROGENEOUS SYSTEMS
Sorption Characteristics of Dolomite Suspension
in Gas Treatment to Remove Carbon Dioxide
E. Sendzikiene, V. Makareviciene, and R. Ciutelyte
Aleksandras Stulginskis University, Kaunas, Lithuania
Received September 9, 2012
Abstract—In using biogas as motor biofuel, it should be treated to remove CO
, which is a ballast component
present in a large amount. The possibility of carbon dioxide absorption by methyldiethanolamine and dolomite
suspension was examined.
Transport is one of signiﬁ cant sources of environ-
ment pollution, and the use of biofuel would allow
the pollution level to be signiﬁ cantly decreased . In
automobile transport, it is possible to use biogas as bio-
fuel. Furthermore, production of biogas is advantageous
from both environmental (utilization of organic wastes
such as sludge, slurries, dump wastes, etc.) and energy
production (after removal of water, dust, СО
etc.) viewpoints. After puriﬁ cation of biogas to the level
required of natural gas (СH
, 87–95%) [2–4], it can be
not only used in transport sector as motor fuel, but also
supplied to gas pipelines.
The major components of biogas are methane (40–
75%) and carbon dioxide (15–60%). The components
that can be present in smaller amounts are H
S (0.005–2%), siloxane (0–0.02%), halogenated hydro-
carbons (<0.6%), NH
(0–1%), CO (<0.6%),
To use biogas as motor biofuel, it should be treated to
, which is present in biogas in a large amount.
Along with the existing processes used for this purpose,
new processes, less harmful for the environment, are
In the existing commercially used processes, carbon
dioxide is removed by chemical or physical absorption.
The most widely used process is chemical absorption us-
ing amines: monoethanolamine (MEA), diethanolamine
(DEA), and methyldiethanolamine (MDEA). Mono-
ethanolamine solutions are widely used owing to their
low cost and high performance [6–11], but they cause
corrosion, and their regeneration is power-consuming
. In industry, MDEA solutions of high concentration
(15–40%) are mainly used [12–14].
Also used for removing СО
are aqueous potassium
carbonate solution, membranes, and cationic zeolites .
Zeolites are typical sorbents used for gas treatment. Many
authors examined experimentally and theoretically the
absorption from various gas mixtures using combina-
tions of membranes and various sorbents [16, 17]. After
puriﬁ cation, the CO
content of biogas is reduced from
30–40% (on the average) to 2–10% .
The possibility of using natural sorbents for biogas
treatment is actively examined today. One of such natural
sorbents is dolomite. This is a carbonate mineral. The use
of dolomite in gas treatment is a promising and relatively
novel method allowing synthetic sorbents to be replaced
by natural sorbents. Data on the use of dolomite as an
absorbent for binding СО
are available from the literature
[19–21], but we found no data on the use of dolomite
solutions or suspensions for biogas treatment.
The goal of this study is to compare the performance
of dolomite suspension and MDEA solution in biogas
treatment to remove CO
In our studies we used the following materials: