Distillation: processes – thermolytic – Sequentially removing – treating and recycling a product – Removing and treating vapor
Patent
1985-11-12
1988-02-16
Richman, Barry S.
Distillation: processes, thermolytic
Sequentially removing, treating and recycling a product
Removing and treating vapor
34 26, 34 36, 44 1R, 44 1SR, 201 1, 201 17, 201 41, C10B 5710, F26B 306
Patent
active
047253371
ABSTRACT:
A process is disclosed for removing a substantial portion of water and impurities from low rank coal and peat, whereby an improved coal or peat product (not found in nature) is obtained. The low rank coal and peat are subjected to a superheated gaseous medium, thereby substantially desorbing the moisture from the coal or peat and producing superheated gases. A substantial portion of the superheated gases produced is recycled back in contact with the coal being dried. Sufficient heat is added to the recycled gases, in response to monitoring, so that the recycled gases are maintained in a substantially superheated condition throughout. This process produces a dried, substantially purified product which retains a substantial portion of its volatile content, which has an improved heat value per unit weight, and which will not absorb substantial moisture when stored or transported. In one embodiment, the process utilizes superheated steam to initiate the drying process. In another embodiment, that minor portion of the superheated gases in excess of the original volume not being recycled is recovered, and the fuel content thereof is used to provide energy for reheating the gases being recycled. In yet another embodiment, the processes are maintained at low pressures of under approximately 50 inches water column pressure. The process also removes a substantial portion of the impurities such as sulfur, from the low rank coal and peat. The dried product may be cooled, and the impurities may be separated therefrom.
REFERENCES:
patent: 2772265 (1956-11-01), Siddiqui
patent: 2843942 (1958-07-01), Whitsel
patent: 3518773 (1970-07-01), Johanson
patent: 4053285 (1977-10-01), Robinson et al.
patent: 4249909 (1981-02-01), Comolli
patent: 4295281 (1981-10-01), Potter
patent: 4429643 (1984-02-01), Mulholland
patent: 4502227 (1985-03-01), Janusch
Bloom Leonard
Richman Barry S.
Western Energy Company
Woodard Joye L.
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