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1. (WO2018162150) A PLANT FOR THE PRODUCTION OF NITRIC ACID, A RELATED PROCESS AND METHOD OF REVAMPING

Pub. No.:    WO/2018/162150    International Application No.:    PCT/EP2018/052469
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Fri Feb 02 00:59:59 CET 2018
IPC: C01B 21/26
C01B 21/28
C01B 21/46
B01D 53/02
B01D 53/56
Applicants: CASALE SA
Inventors: CEREA, Iacopo
GRANGER, Jean François
Title: A PLANT FOR THE PRODUCTION OF NITRIC ACID, A RELATED PROCESS AND METHOD OF REVAMPING
Abstract:
A dual-pressure plant for the synthesis of nitric acid comprising: a reactor (4) providing a gaseous effluent (15) containing nitrogen oxides; an absorption tower (6) nitrogen oxides react with water providing raw nitric acid and, said absorption tower operating at a pressure greater than the pressure of the reactor; a compressor (5) elevating the pressure of the reactor effluent (15) to the absorption pressure; said plant also comprising a first bleacher (37) and a second bleacher (7), said first bleacher (37) stripping with air (39) nitrogen oxides from the output stream (27) of the absorption tower (6) providing a partially stripped nitric acid stream (40) and a nitrogen oxides-loaded air stream (41 ), the former being fed to the second bleacher (7) and the latter being recycled to the delivery-side of said compressor (5).