Влияние желатина трески и альгината натрия на нуклеацию газовых гидратов

Abstract

This work studied the effect of mixtures of fish gelatin (protein) from Atlantic cod skin and sodium alginate (polysaccharide) from brown algae on the nucleation of sII methane-propane hydrate. The rocking cell method with ramp cooling was employed to determine the supercooling required for the hydrates formation from solutions of individual polymers and their mixtures.Unlike sodium alginate, which has practically no effect on the formation of gas hydrates, the gelatin inhibitory activity was intermediate between polyvinylpyrrolidone and polyvinyl caprolactam (commercial kinetic hydrate inhibitors). In the caseof polymer blends, a slight decrease in the efficacy of gelatin at fixed content was observed as the sodium alginate concentration decreased. The results indicate the antagonism of the kinetic inhibition of methane-propane hydrate by mixtures of biological polyelectrolytes. Undoubtedly, intermolecular interactions in polysaccharide-gelatin complexes in solution affect the abilityof polymers to retard the nucleation process. A more detailed study of the kinetics of hydrate formation depending on the ratio of polymers in solution will make it possible to reveal the mechanism of their influence and to propose mixed reagentsto control the hydrate formation.