Distillation: processes – thermolytic – And shaping to desired form or configuration
Patent
1976-02-19
1977-11-01
Wolk, Morris O.
Distillation: processes, thermolytic
And shaping to desired form or configuration
201 8, 201 21, 201 29, 201 31, 201 36, 201 37, 201 44, C10B 4724, C10B 4910, C10B 5304, C10B 5704
Patent
active
040564436
ABSTRACT:
Coke is produced with high yield and low sulfur by heating and drying ground coking coal at 200.degree. to 300.degree. C. for 15 to 120 minutes in air, and then heating in three semicoking stages in fluidized bed reactors. The first semicoking stage is 300.degree. to 470.degree. C. for 10 to 20 minutes; the second is 400.degree. to 600.degree. C. for 10 to 20 minutes; while the third is 800.degree. to 1100.degree. C. for 10 to 20 minutes. Tar is condensed from the offgases of the first two semicoking stages and the residual gas from each is divided and 60 to 80% recycled as fluidizing gas to the same semicoking reactor. 10 to 20% of the offgases from the third semicoking stage is recycled to the third stage as fluidizing gas. In addition, oxygen is used as make-up fluidizing gas in each of the three stages, in the amount of 10 to 30 liters per kilogram of dry coal in the first stage, 5 to 20 liters per kilogram of dry coal in the second stage, and 40 to 100 liters per kilogram of dry coal in the third stage. The offgas from the third stage is high in reducing power. The condensed tar is fed to the final coke-forming operation.
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Colletta Angelo
Palumbo Luigi
Centro Sperimentale Metallurgico S.p.A.
Marcus Michael S.
Wolk Morris O.
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