Chongqing University School of Resources and Environmental Science, People├ó┬?┬?s Republic of China
Scientific Tracks Abstracts: J Chromatogr Sep Tech
In the present work, we studied the simultaneous separation of H2S and CO2 from biogas by gas-liquid membrane contactor using single and mixed absorbents. The synthetic biogas contained 300 to 900 ppm H2S, 30% to 50% CO2 and CH4. In order to gain a better understanding on the role of different absorbents on simultaneous separation of H2S and CO2 from biogas, water, monoethanolamine (MEA, primary amine), potassium carbonate (K2CO3, inorganic salt), Potassium hydroxide (KOH, inorganic salt), potassium glycinate (PG, organic salt), potassium sarcosine (PS, organic salt), potassium L-proline (PLP, organic salt) were applied as absorbent solutions. Poly (vinylidene fluoride) (PVDF) hollow fibre membrane was used in the membrane contactor modules. The performances of both single and mixed solutions on H2S and CO2 simultaneous absorption capacity were investigated. In addition, the effects of liquid and gas velocities, absorbent concentration and acid gas content of the feed, pressure, on the absorption performance, overall mass transfer coefficients and selectivity of H2S were investigated. The results indicate that the use of K2CO3 and KOH as absorbents gave highest H2S flux, and the highest CO2 flux was obtained using PG as the absorbent. The use of mixed solutions can simultaneously improve the absorption flux of H2S and CO2. The results of H2S selectivity showed that liquid side resistance is negligible in comparison with membrane and gas side resistances for H2S absorption. On the contrary, liquid phase resistance controlled the mass transfer for the mass transfer of CO2. For the partially wetted mode, the wetted membrane resistance was insignificant and gas phase resistance controlled the mass transfer.
Pengrui Jin has completed his Bachelor at the age of 23 years from Chongqing University of technology and he is doing his masters at Chongqing University School of Resources and Environmental Science. He has published two papers in reputed journals.