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.