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Earlier research has revealed that Westerholt coal extracts, some of which retain high boiling points, cannot be converted entirely into light and medium heavy oil distillates; but in the catalytic after-hydrogenation of heavy oil fractions obtained in this process, which contain high proportions of undistillable high-molecular components, the bifunctional NiMo contacts are sufficient to crack high-boiling distillate fractions into light or medium heavy, and most of the previously undistillable material into high-boiling material. It should therefore be possible to obtain an optimum yield of light and medium heavy distillate through a continuous process in which extracts are catalytically hydrogenated in combination with the heavy oil obtained in the process. Under certain conditions, this should generate enough product distillate to justify the mass of extract used, whilst at the same time enabling heavy oil of consistent quality and quantity to be retrieved. In the period covered by the present report, an additional bifunctional catalyser was tested, a way of deactivating the catalyser was investigated, further standardised extract hydrogenation tests were carried out, and a model was developed for extract hydrogenation in coal oils fed back into the process which differ in boiling point and composition.

Additional information

Authors: DMT, DMT-Gesellschaft für Forschung und Prüfung mbH, Bochum (DE)
Bibliographic Reference: EUR 14276 DE (1993) 77 pp., MF, ECU 4
Availability: (2)
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