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Thermodynamic and kinetic effect of biodegradable polymers on carbondioxide hydrates
Sana Yaqub,Bhajan lal,Lau Kok Keong 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
In this work, the effect of biodegradable polymers, i.e. pectin (PC), sodium-carboxymethyl cellulose (Na-CMC), tapioca starch (TS) and dextran (DX) on thermodynamics and kinetics of CO2 hydrates areevaluated on sapphire hydrate reactor. The CO2 hydrate liquid vapour equilibrium (HLwVE) data isevaluated in the presence of biopolymers (1.5 wt%) using isochoric T-cycle method at temperature andpressure ranging from 278.7 to 283.0 K and 2.3 to 4.3 MPa respectively. The effect of biopolymers onHLwVE curve is reported by measuring average increment temperature (DÜ). The constant coolingmethod is used to evaluate the kinetics of CO2 hydrates at 4.3 MPa in the presence of biopolymers (0.12–1.5 wt%) at 274.15 K and 277.15 K. The inhibition effect of biopolymers on the kinetics of CO2 hydrate isreported by measuring induction time, hydrate formation rate and amount of gas consumed. The kineticinhibition strength of biopolymers is compared with poly-N-vinylpyrrolidone (PVP) and with two noncommercialinhibitors, i.e. glycine and tetra-methyl ammonium chloride (TMACl) through relativeinhibition strength (RIS). Results reveal that DX shows maximum increment temperature of 0.36 K. WhilePC and Na-CMC delayed CO2 hydrate nucleation for 423 and 181 min respectively. Additionally,biodegradation study on biopolymers indicates that, compared to PVP, biopolymers are easilybiodegradable and show potential for gas hydrate offshore applications.
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