Studies on Sorption Property Forwards Caffeine and Theophylline by Phenolic Resin

Abstract

Abstract: The sorption of phenolic resin adsorbents JDW-2(made by ourself) and Duolite S-761 for caffeine and theophylline was studied under static and dymanic conditions in this paper.The experimental results show that the sorption properties of JDW-2 for caffeine and theophylline are superior to that of Duolite S-761. The surface area, the moisture retention and phenolic hydroxyl amount of adsorbents jointly influenced the sorption.Though JDW-2 has a lower surface area than Duolite S-761, the former sorbents has a higher moisture retention(42%) and phenolic hydroxyl amount(3.72 mmol/g) as compared to that of the latter.Finally, we have found that the sorption of caffeine by JDW-2 is faster than that by Duolite S-761 under static conditions, the saturation sorption capacity of JDW-2 for caffeine and theophylline is 246 and 127mg/g dried resin respectively, and that of Duolite S-761 is only 121 and 53 mg/g respectively.Asemi-empirical rate equation adequately fit the sorption rate data of caffeine in the initial period.The sorption mechanism of JDW-2 and Duolite S-761 resins for caffeine was confirmed by the particle-diffusion control of the sorption process in the initial period.The equilibrium sorption data for phenolic resin sorbents/caffeine(or theophylline) systems showed good agreement with the Langmuir isotherm equation.The correlation coefficients are bigger than 0.99.The sorption of caffeine and theophylline therefore is monomolecular sorption.It is clear that the volume of 1mol/Lhydrochloric acid in 40% aqueous methanol at the rate of desorption 1.5BV/h for removing 88% and 93% all the caffeine adsorbed on JDW-2 are 4 and 5BV(bed volume) respectively, and that of 1mol/Lhydrochloric acid in 80% aqueous methanol at the rate of desorption 1.5BV/h for removing 91% and 96% all the theophylline adsorbed on JDW-2 are 3 and 4 BVrespectively under dynamic conditions, which show that phenolic resin adsorbent possesses excellent desorption performance.It is very good to use 1mol/Lhydrochloric acid in 40%(or 80%) aqueous methanol as composite desorption solvent stripping caffeine(or theophylline) from JDW-2.

Key words: Phenolic resin, Sorption property, Caffeine, Theophylline

CLC Number:

O647.3

TrendMD:

WANG Zhong, SHI Zuo-Qing, WANG Rui-Fang . Studies on Sorption Property Forwards Caffeine and Theophylline by Phenolic Resin[J]. Chem. J. Chinese Universities, 2003, 24(10): 1896.

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Studies on Sorption Property Forwards Caffeine and Theophylline by Phenolic Resin

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