Production of nitric acid

Details Production of nitric acid Production of nitric acid

1975-05-09

1977-08-16

Scovronek, Joseph

Chemistry: physical processes

Physical processes

Crystallization

23277R, 23284, 165 4, 165 7, 423390, B01J 700, C01B 2140, F23L 1502, F28D 1702

Patent

active

040423395

ABSTRACT:
A process and plant is provided for the production of nitric acid from atmospheric air in which the feed air is passed in succession through a number of stages each comprising a high temperature regenerative nitrogen fixation reactor followed by a catalytic oxidation reactor and a nitric oxide absorber, all operating at superatmospheric pressure. Heat is exchanged between the inlet and outlet gas streams of each stage absorber. The compressors are driven by a turbo-expander powered by the exit gas stream in which fuel has been burned upstream of the turbo-expander. The nitrogen fixation reactors each consist of a pressure vessel enclosing a gas-permeable refractory wall surrounding a furnace chamber in which fuel is burned, the interior of the vessel being divided into two sections by an impermeable wall with a gap for flow through in the furnace zone.

REFERENCES:
patent: 2422081 (1947-06-01), Cottrell
patent: 2704242 (1955-03-01), Strauss
patent: 2955917 (1960-10-01), Roberts et al.
patent: 2956864 (1960-10-01), Coberly
patent: 3808327 (1974-04-01), Roberts

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