Control of nitric acid plant stack opacity during start-up and s

Chemistry of inorganic compounds – Nitrogen or compound thereof – Oxygen containing

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C01B 2140

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active

048698903

ABSTRACT:
The present invention is a process for the control of nitric acid plant stack opacity in the range from 0 to 10 percent during plant startup and shutdown. The process is a series of sequential steps which encompass maximizing pressure, water and air flow to the absorber and adding ammonia upstream of the catalytic combustor. The process is typically accomplished through an automatic control system.

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Andersen et al., "Catalytic Treatment of Nitric Acid Plant Tail Gas", Industrial and Engineering Chemistry, vol. 53, No. 3 (Mar. 1961), pp. 199-204.

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