Chemistry of inorganic compounds – Nitrogen or compound thereof – Oxygen containing
Patent
1980-12-17
1982-05-18
Peters, G. O.
Chemistry of inorganic compounds
Nitrogen or compound thereof
Oxygen containing
C01B 2140, F01L 2500
Patent
active
043305202
ABSTRACT:
The process and apparatus described seeks to prevent NO.sub.x emissions after an emergency shutdown in a process for manufacturing nitric acid by catalytic combustion of ammonia, compression of the nitrous combustion gases and subsequent absorption. Immediately on shutdown the intake nitrous gas supply to the compressor is interrupted, the residual intake side nitrous gases are conveyed to the delivery side, the delivery side gas volume is shut off, the gas on the delivery side is expanded to the intake side and then exhausted into a vacuum system. Subsequently the acid charged with NO.sub.x in the absorption stages is drawn off, degassed acid is circulated through the absorption stages until equilibrium is established, the pressure of the shutoff section is released and cooled acid is admitted to the absorption stages.
REFERENCES:
patent: 2942953 (1960-06-01), Shields
patent: 2955917 (1960-10-01), Roberts et al.
patent: 3450498 (1969-06-01), Sales
patent: 3977815 (1976-08-01), Stull
Niezgoda, R. B. et al., "Nitrogen," vol. 112, 1978.
Olsen, John C., Unit Processes and Principles of Chemical Engineering, Van Nostrand Co., N.Y., 1932, pp. 1-3.
Davy McKee Aktiengesellschaft
Peters G. O.
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