Patent · US Expired

Process for the production of nitric acid

US6264910A · kind A · utility

8Cited by

1References

7Claims

0Family size

Assignee

Krupp Uhde GmbH · DE

Inventors

Rainer Maurer · Schwelm, DE
Erich Szonn · Witten, DE
Wolfgang Seehars · Oberhausen, DE
Lothar Mietze · Wesel, DE

Key dates

Filing date	Mar 26, 2001
Grant date	Jul 24, 2001
Priority date	—
Expiry date	Mar 26, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/129
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A process for the production of nitric acid using the dual-pressure process in which the ammonia is burnt at an initial low pressure with the aid of compressed process air and the nitrous gases formed during combustion are at least partly absorbed by water at a second pressure which is higher than the first. This causes nitric acid to be produced and the pressure of the residual gas, which is not absorbed, is reduced to atmospheric pressure in a residual gas expander for the purpose of winning compression potential. Said process provides a solution aimed at optimising the production of nitric acid whilst improving the production parameters and the materials and energy balances. This is achieved by supplying a multishaft geared centrifugal compressor separately with process air and nitrous gas, the process air being compressed to the initial pressure and the nitrous gas being compressed to a second pressure.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.