Removal of NO sub x from flue gases using the urea acidic process; Kinetics of the chemical reaction of nitrous acid with urea

Journal Article · Sat Feb 29 23:00:00 EST 1992 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00003a020· OSTI ID:5316558

Lasalle, A; Roizard, C; Midoux, N; Bourret, P; Dyens, P J ^[1]

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1. Lab. des Sciences du Genie Chimique and Lab. de Physico, Chimie Industrielle, CNRS-ENSIC-INPL, BP 451, 54001 Nancy Cedex (FR)

This paper deals with the removal of nitrogen oxides from flue gases using the acidic urea process. The chemical hydrolysis of nitrous acid, which leads to NO formation, is avoided by nitrous acid reaction with urea. Products of this reaction are gases, e.g. CO{sub 2} and N{sub 2} which can then be directly released into the atmosphere. The aim here is to determine the kinetic parameters of the chemical reaction of nitrous acid with urea. Experiments are performed in a closed stirred reactor. The manometric method (measurement of the pressure versus time curve) leads to the determination of the concentration of HNO{sub 2} and then to the chemical rate versus time. Operating parameters are the concentration of urea (333-3330 mol m{sup {minus}3}), the pH (0.75-1.25), and the temperature (3-40{degrees}C). The experimental results are as follows: the order relative to nitrous acid is 1; the rate constant decreases with pH; the influence of temperature on the rate constant can be expressed by (pH = 1) k = 1.82 {times} 10{sup 8} exp ({minus}(60400/RT)) (SI units).

• OSTI ID: 5316558
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 31:3; ISSN 0888-5885; ISSN IECRE
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020800 -- Petroleum-- Waste Management
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
AMIDES
CARBONIC ACID DERIVATIVES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONTROL
DATA
DENITRIFICATION
EXPERIMENTAL DATA
FLUE GAS
GASEOUS WASTES
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
KINETICS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS ACID
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
REACTION KINETICS
UREA
WASTES