Effect of the Presence of Water-soluble Amines on the Carbon Dioxide (CO2) Adsorption Capacity of Amine-grafted Poly-succinimide (PSI) Adsorbent During CO2 Capture

Modelling and experimental investigation of effects of moisture and operating parameters during the adsorption of CO2 onto polyaspartamide

“…The adsorption capacities reported in this study were obtained from experiments conducted in a packed bed adsorption column at an operating temperature of 403 K. The maximum adsorption capacity of polyaspartamide reported in this study (350 mgCO 2 /g adsorbent) was obtained at the highest pressure of 200 kPa in this study using a gas composition of 15% CO 2 and 85% N 2 . This value is higher than that reported by Chitsiga et al (2016), where the authors reported an adsorption capacity of 44 mgCO 2 /g using a 100% CO 2 source in a thermogravimetric analyzer (TGA) under the same operating conditions. The higher adsorption capacity reported herein could be attributed to the closer contact between the adsorbent (Polyaspartamide) and the adsorbate (CO 2 ) within the packed bed and increased residence time due to packings in the column than in the thermogravimetric analyzer used by Chitsiga et al (2016).…”

“…This value is higher than that reported by Chitsiga et al (2016), where the authors reported an adsorption capacity of 44 mgCO 2 /g using a 100% CO 2 source in a thermogravimetric analyzer (TGA) under the same operating conditions. The higher adsorption capacity reported herein could be attributed to the closer contact between the adsorbent (Polyaspartamide) and the adsorbate (CO 2 ) within the packed bed and increased residence time due to packings in the column than in the thermogravimetric analyzer used by Chitsiga et al (2016). The different composition of gases used in both studies also contributed to the high adsorption capacity obtained in this study.…”

“…To investigate the effect of temperature on the adsorption capacity of polyaspartamide, data obtained from the experiments conducted at 403, 418 and 433 K were analysed. These temperatures were chosen because Chitsiga et al (2016) reported that polyaspartamide is usually thermally stable at about 210°C (483 K). Since adsorption is a temperature dependent surface phenomenon favoured by lower temperatures, any further decrease in temperature below 403 K is expected to result to a higher adsorption capacity before equilibrium is attained and the material gets saturated.…”

“…Synthesis and characterization of polyaspartamide have been adequately reported in our previous works (Chitsiga et al 2016;Ngoy et al 2017;Yoro et al 2017). A study on the kinetic behaviour of polyaspartamide has also been reported recently (Yoro et al 2017), but the influence of moisture and other operating parameters on the adsorption capacity of polyaspartamide during the adsorption of CO 2 from a flue gas stream is rare and has not attracted adequate attention in the past.…”

“…Its rich amine-content, high thermal stability, high adsorption capacity and ability to be regenerated after use makes it a potential material for CO 2 capture. Details on its preparation and cost have been reported extensively in our previous works (Ngoy et al 2017;Chitsiga et al 2016). Hence, it is not repeated in this work.…”