Clarence A Johnson

39855171, Oct 12, 1976

Aug 20, 1975

5/606258

Clarence A. Johnson - Princeton NJ

Hydrocarbon Research, Inc. - Morristown NJ

C10L 900
F26B 308

44 1R

Low rank coals such as subbituminous or lignites containing more than about 10 weight percent moisture are dried and passivated against reabsorption of moisture in a fluidized bed by heating the particulate coal with a warm inert gas passing upwardly through the bed and simultaneously coating the warm particulate coal with a heavy liquid hydrocarbon material. Such coating aids in the removal of the moisture and prevents the reabsorption of moisture by the coal and thereby prevents consequential heating and possibly spontaneous ignition of the coal during its subsequent transportation or storage.

40999335, Jul 11, 1978

Jun 10, 1975

5/585696

Clarence A. Johnson - Princeton NJ
John Shen - Gaithersburg MD

Hydrocarbon Research, Inc. - Lawrenceville NJ

C10J 354

48202

The gasification of coal to produce a methane-rich product gas is accomplished through the controlled slow heating of particulate coal in a gasifier comprising two or more zones, whereby any significant decrease in the density of the coal particles is minimized and particle swelling and friability are significantly reduced, while the carryover of fines and deposition of tars in the product gas conduit are thereby minimized. The particulate coal heating rate in the gasifier zones is usually between about 10. degree. and 200. degree. F per minute. When the particulate coal is to be fed to the gasifier at elevated temperature, further improvements are achieved with swelling type caking coals through their pretreatment by preheating the coal at a slow rate between 10. degree. and 100. degree. F per minute up to about 800. degree. F in multiple fluidized beds.

39855163, Oct 12, 1976

Aug 20, 1975

5/606256

Clarence A. Johnson - Princeton NJ
William Volk - Princeton NJ

Hydrocarbon Research, Inc. - Morristown NJ

C10L 900
F26B 308

44 1R

Low rank coals such as subbituminous or lignites containing more than about 10 wt. % moisture are first dried and then passed to a fluidized bed where the coal is passivated against reabsorption of moisture by coating the warm coal particles with a heavy liquid hydrocarbon material. Such coating substantially prevents the reabsorption of moisture in the coal, and thereby prevents autogenous heating and possible spontaneous ignition during subsequent transportation or storage of the passivated coal.