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Upgrading of coal-derived products

โœ Scribed by Peter C. Wailes

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
652 KB
Volume
61
Category
Article
ISSN
0016-2361

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โœฆ Synopsis

A number of processessuch as pyrolysis, solvent extraction, etc. can be used for the primary upgrading of coal to liquid products. The type of process used can have a significant influence on the character of the product obtained. The chemistry and associated problems involved in the catalytic hydrotreatment of flash pyrolysis tars are discussed in this Paper. The difficulties encountered in the upgrading of flash pyrolysis tar are due principally to factors such as the thermal instability of the tar (high Conradson carbon), particulate matter in the tar and the high molecular weight of the tar. The design and mode of operation of the reactor have been chosen to minimize such problems. An important function of the catalyst used in this work (C&MO-AI,O, and Ni-Mo-A1203) was to reduce the heteroatom content of the feedstock. A description of the type of molecules and reactions involved in tar upgrading is given.

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