SEPARATION OF n- ALKANES PARAFFINS FROM FISCHER-TROPSCH SYNTHETIC OILS BY GRADIENT COOLING UREA COMPLEXING METHOD

PETROLEUM PROCESSING AND PETROCHEMICALS ›› 2021, Vol. 52 ›› Issue (5): 31-35.

SEPARATION OF n- ALKANES PARAFFINS FROM FISCHER-TROPSCH SYNTHETIC OILS BY GRADIENT COOLING UREA COMPLEXING METHOD

Received:2020-11-06 Revised:2020-11-27 Online:2021-05-12 Published:2021-04-23
Contact: yun donghan E-mail:hdy_mailbox@163.com

Abstract

Abstract: With Fischer-Tropsch synthetic distillates as raw materials, a gradient cooling urea complexing method was used to separate n-alkanes to produce liquid paraffin from coal-based Fischer-Tropsch synthesis. The results showed that when the temperature of the reaction system decreased from 45 °C to 25 °C at the rate of 1 °C/min, the mass ratio of urea isopropanol aqueous solution to oil was 10:1, and the mass ratio of urea, isopropanol and water was 38:40:22, the mass fraction of n-alkanes in heavy liquid paraffin was about 93% , and its properties could meet the requirements of NB/SH/T 0416-2014 quality standard. Compared with traditional cooling urea complexing method, gradient cooling urea complexing method could greatly improve the purity of liquid paraffin product and the recovery of n-alkanes.

Key words: gradient cooling, urea complexing, F-T synthetic oil, liquid paraffin

References

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