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Title: Absorption of sparingly soluble gases by reactive media in self-aerated gas-liquid contactors: A scale-up procedure

Abstract

Absorption of sparingly soluble gases, such as NO or O{sub 2}, is greatly enhanced if the latter react with the media. Among a dozen of reactive solvents for NO{sub x} abatement, aqueous acidic urea appears the most economically and environmentally attractive because urea is a cheap reagent and because products of reaction of urea with nitrous acid, formed in the liquid phase via absorption of NO and NO{sub 2}, are carbon dioxide and nitrogen, which can be directly released into the atmosphere. That makes urea process unique among other wet scrubbing processes that routinely produce secondary waste. Its full potential has never been realized, perhaps due to the lack of an efficient gas-liquid contactor to overcome low solubility of NO in aqueous solutions. LLNL has recently designed and built a bench scale gas-liquid contactor for nitric acid regeneration with oxygen. The contactor proved very effective in overcoming the problem of low solubility of oxygen converting back to nitric acid approximately 99% of nitrous acid formed at the cathode (which would otherwise convert to NO{sub x}). The bench scale contactor consists of a 12 inch diameter tank with self-inducting impeller/aerator of very high gas capacity. The aerator represents a 3.5 inchmore » turbine mounted on a vertical shaft inside the draft tube equipped with a stator. During operation the lower half of the turbine induces liquid and the upper half induces gas from the draft tube. The new contactor offers two approaches to solving the NO{sub x} pollution problem. Where full recovery of nitric acid is desired, oxygen can be fed into the contactor to convert nitrous acid into nitric. This approach was demonstrated at LLNL. Alternately, in the proposed acidic urea process nitrous acid, as it forms from NO{sub x}, would be converted to nitrogen, water and carbon dioxide.« less

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10121165
Report Number(s):
UCRL-ID-119563
ON: DE95006429;; TRN: AHC29509%%5
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jan 1995
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; NITROGEN OXIDES; AIR POLLUTION CONTROL; UREA; SOLVENT PROPERTIES; CHEMICAL REACTORS; COMPUTER-AIDED DESIGN; NITRIC OXIDE; ABSORPTION; NITROUS OXIDE; NITRIC ACID; MATERIALS RECOVERY; EXPERIMENTAL DATA; 540120; CHEMICALS MONITORING AND TRANSPORT

Citation Formats

Zundelevich, Y. Absorption of sparingly soluble gases by reactive media in self-aerated gas-liquid contactors: A scale-up procedure. United States: N. p., 1995. Web. doi:10.2172/10121165.
Zundelevich, Y. Absorption of sparingly soluble gases by reactive media in self-aerated gas-liquid contactors: A scale-up procedure. United States. https://doi.org/10.2172/10121165
Zundelevich, Y. 1995. "Absorption of sparingly soluble gases by reactive media in self-aerated gas-liquid contactors: A scale-up procedure". United States. https://doi.org/10.2172/10121165. https://www.osti.gov/servlets/purl/10121165.
@article{osti_10121165,
title = {Absorption of sparingly soluble gases by reactive media in self-aerated gas-liquid contactors: A scale-up procedure},
author = {Zundelevich, Y},
abstractNote = {Absorption of sparingly soluble gases, such as NO or O{sub 2}, is greatly enhanced if the latter react with the media. Among a dozen of reactive solvents for NO{sub x} abatement, aqueous acidic urea appears the most economically and environmentally attractive because urea is a cheap reagent and because products of reaction of urea with nitrous acid, formed in the liquid phase via absorption of NO and NO{sub 2}, are carbon dioxide and nitrogen, which can be directly released into the atmosphere. That makes urea process unique among other wet scrubbing processes that routinely produce secondary waste. Its full potential has never been realized, perhaps due to the lack of an efficient gas-liquid contactor to overcome low solubility of NO in aqueous solutions. LLNL has recently designed and built a bench scale gas-liquid contactor for nitric acid regeneration with oxygen. The contactor proved very effective in overcoming the problem of low solubility of oxygen converting back to nitric acid approximately 99% of nitrous acid formed at the cathode (which would otherwise convert to NO{sub x}). The bench scale contactor consists of a 12 inch diameter tank with self-inducting impeller/aerator of very high gas capacity. The aerator represents a 3.5 inch turbine mounted on a vertical shaft inside the draft tube equipped with a stator. During operation the lower half of the turbine induces liquid and the upper half induces gas from the draft tube. The new contactor offers two approaches to solving the NO{sub x} pollution problem. Where full recovery of nitric acid is desired, oxygen can be fed into the contactor to convert nitrous acid into nitric. This approach was demonstrated at LLNL. Alternately, in the proposed acidic urea process nitrous acid, as it forms from NO{sub x}, would be converted to nitrogen, water and carbon dioxide.},
doi = {10.2172/10121165},
url = {https://www.osti.gov/biblio/10121165}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {1}
}