Statistical study on the batch conversion of estevan lignite into oils using carbon monoxide and hydrogen mixtures

Abstract

Batch autoclave hydrogenolysis of a Saskatchewan lignite has been conducted with CO and H2 mixtures. Conversion, oil yield and the carbon monoxide consumption patterns were measured as a function of reaction temperature (380 — 460°C), initial cold pressure (7.1 — 11.1 MPa), contact time (10 — 50 min), and initial CO/H2 gas composition (1/3 — 3/1 vol. %). The experimental results were obtained following an unreplicated 24 factorial design. Significant models were derived for conversion and the CO consumption patterns. A relationship seems to develop between carbon monoxide consumption and the amount of oil produced. The oil yield model however showed a lack‐of‐fit at the F5% level. The highest conversion and oil yield experimentally obtained were 85.3 and 63.4% respectively, on the lignite m.a.f. basis. In general greater hydrogenation but less deoxygenation occurred at the lower temperature.