STUDY OF PROCESSING FISCHER-TROPSCH WAXES BY VACUUM DISTILLATION AND EXTRACTION REFINING

Abstract

Abstract: This paper introduced a method of refining Inner Mongolia Itai Fischer-Tropsch waxes to reduce oil content. The method removed iso-hydrocarbons and oxygenate by combining process of vacuum distillation and solvent extraction. The effects of the extraction agent, the conditions of extraction on the removal efficiency were investigated. The Fourier transform infrared spectroscopy (FT-IR) and High temperature gas chromatography simulated distillation were applied to analyze the Fischer-Tropsch waxes. The results showed that the yield of Fischer-Tropsch waxes and oil content can reach 93.75% and 0.97‰, respectively by using N-methyl pyrrolidone as solvent, extraction temperature of 120℃, catalyst/oil ratio of 2:1. At this point, the refined wax has a melting point of 112°C and a penetration of 0.1mm. The product satisfies the quality standard of H105 Fischer-Tropsch wax produced by Sasol. The carbon number of refined F-T waxes is distributed between C19 and C120, and FT-IR characterization showed that it is simple in structure, mainly composed of long chain n-alkanes, among which the content of C35 is the highest.

Key words: Fischer-Tropsch wax, iso-hydrocarbon, oxygenate, extraction refining

References

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