2.4 Determination of H2S capacity
The absorption experiment of the multimer absorbent for
H2S was carried out in a three-necked round bottom flask
with magnetic stirring. H2S gas was bubbled into the
multimer absorbent at a flow rate of 200 mL/min under atmospheric
pressure with continuous stirring 15 min. The residual exhaust gas from
the three-necked round bottom flask is absorbed by inorganic alkali
solution and then discharged. The obtained rich solution formed after
interaction between multimer absorbent with H2S was
named DBU-2EG-4H2S complexes. The preparation methods of
DBU-EG-2H2S complexes was similar to
DBU-2EG-4H2S complexes.
The absorption solubilities are calculated using the following formula.
where m 1 is the mass of multimer absorbent;m 2 is the mass of DBU/EG/H2S
complexes.