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Previous issue date: 2006 / Elevated levels of nitrogen oxides (NOX) from flue gases have recently
become a major issue in industrial environment. This causes that the laws are
becoming each time more demanding. The most employed reduction processes are:
absorption by an aqueous acidic solution and catalytic gas-solid reduction. The
nitrogen oxides absorbed into water leads to the formation of nitrous and nitric
acid. The nitrous acid is unstable and hydrolyses into nitric acid and nitrogen
monoxide which is more pollutant then than nitrogen oxides (NOX). But it may be
absorbed by a sulfamic acid solution in a mechanically stirred closed reactor,
where the products of this reaction are sulfuric acid and N2 which can then be
directly released into the atmosphere. The present study performed the reduction of
nitrous acid (0.00143 to 0.00333 kmolm-3) by an amimo sulfamic acid solution
(0.00143 to 0.00500 kmolm-3). First the favorable operational conditions were
analyzed (stoiquiometric ratio, agitator speed and temperature). From the results
the apparent kinetic constant was obtained ( K = 0.00385 kmol.m-3.s-1) e the gasliquid
mass transfer coefficients (kLa = 0.00508 s-1; 0.00738 s-1; 0.01272 s-1;
0.03093 s-1; 0.04706 s-1; 0.05272 s-1) varied with the respective agitation speed
(200rpm; 300rpm; 400rpm; 600rpm; 700rpm), where the operational conditions
were T = 301 K, M = 2.5 and pH = 2.0
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufpe.br:123456789/6718 |
| Date | January 2006 |
| Creators | QUEIROZ, Waldomiro Bezerra de |
| Contributors | LIMA FILHO, Nelson Medeiros de |
| Publisher | Universidade Federal de Pernambuco |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFPE, instname:Universidade Federal de Pernambuco, instacron:UFPE |
| Rights | info:eu-repo/semantics/openAccess |
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