SIMULATION STUDY ON EXTRACTIVE DISTILLATION OF F-T SYNTHETIC ALCOHOL-WATER MIXTURE

Abstract

Abstract: In this paper, simulation study on extractive distillation of F-T synthesis alcohol-water azeotropic system was carried out. Ethylene glycol (EG), N, N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) were added to the simulated mixed alcohol-water system, respectively. The best extractant was selected by evaluating the extractive distillation dehydration effect of the three solvents by UNIFAC model, and applied to the phase equilibrium and continuous distillation test of simulated mixed alcohol feed. The results showed that the effects of EG and DMSO were better than that of DMF. Considering the stability of the extractant, EG was considered as the best extractant for the dehydration of mixed alcohol-water system. When EG was used as extraction agent, the dehydration effects of different solvent ratios were in good agreement with those of UNIFAC. With the increase of solvent ratio, the water content in material at the top part of the distillation column decreased continuously. When the solvent ratio was 3:1, the water mass fraction at the top part of the distillation column could be reduced to less than 0.5%.

Key words: Fischer-Tropsch synthesis, coal-to-oil, mixed alcohol, dehydration, extractive distillation, ethylene glycol

CLC Number:

References

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