Dewatering and upgrading low rank coal by a two-step hydrotherma

Details Dewatering and upgrading low rank coal by a two-step hydrotherma Dewatering and upgrading low rank coal by a two-step hydrotherma

1979-12-10

1981-08-25

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 12, 34 60, F26B 504

Patent

active

042851408

ABSTRACT:
Low rank coal is dewatered and upgraded by heating a coal/water mixture at 150.degree. to 300.degree. C. at a pressure preventing water vaporization, mechanically separating the water, then heating the coal at 300.degree. to 400.degree. C. at a pressure allowing water vaporization.

REFERENCES:
patent: 3552031 (1971-01-01), Evans et al.
patent: 3992784 (1976-11-01), Verschuur et al.

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