Methane-rich
industrial byproducts, such as coke oven gas (COG)
and synthetic ammonia exhaust tail gas, are often regarded as promising
sources of unconventional natural gas. The design spec for liquefaction
of these kinds of unconventional natural gas is quite different from
that of conventional natural gas due to the presence of some special
substances, such as hydrogen. In this work, CO2 solubility
in liquid CH4/H2 mixtures is measured utilizing
a static solid–liquid equilibrium (SLE) experimental apparatus.
The experiments are carried out at cryogenic temperatures between
90 and 150 K in the pressure range of about 1.7–5.4 MPa. The
results are compared with calculations based on the GERG-2008 and
Peng–Robinson (PR) equations of state. It is found that, compared
with the solubility of CO2 in pure methane, the existence
of hydrogen makes CO2 solubility increase significantly
between −160 and −145 °C and decrease significantly
at temperatures above −140 °C. The results provide the
basis for the CO2 purification system of the coke oven
gas and synthetic natural gas liquefaction plant.
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