Benzene degradation in waste gas by photolysis and photolysis-ozonation: experiments and modeling

Mahmoudkhani, Fariba; Rezaei, Mohammad; Asili, Vahid; Atyabi, Mahsasadat; Vaisman, Elena; Langford, Cooper H.; Visscher, Alex De

doi:10.1007/s11783-016-0876-4

Cited by 17 publications

(14 citation statements)

References 40 publications

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“…This assumption is reasonable as it was previously demonstrated [5] that considering light radiation at different angles does not have a pronounced effect (<10 %) on the simulated conversion, while it increases the simulation run time by a factor of 20. This assumption is reasonable as it was previously demonstrated [5] that considering light radiation at different angles does not have a pronounced effect (<10 %) on the simulated conversion, while it increases the simulation run time by a factor of 20.…”

Section: Radiation Field Modelsupporting

confidence: 80%

“…The principle of the model is based on the actual photoreactor for which the setup was described by Mahmoudkhani et al [5] The UV reactor is cylindrical with a continuous flow mode; the effective length is 50 cm and the inside diameter is 4.2 cm, with the lamp (40 W amalgam emitting at 185 nm and 254 nm wavelengths) at the horizontal axis. The base model contains the velocity profile, a chemical kinetics model, a UV radiation field, and material balances.…”

Section: Model Developmentmentioning

confidence: 99%

“…The following sections are a summary of the complete model description for the velocity profile, the radiation field, and the material balances, which were discussed previously by Mahmoudkhani et al, [5] and Asili and De Visscher. [6] Flow Model…”

Section: Model Developmentmentioning

confidence: 99%

“…[5,6] Moreover, calculation of the entrance length showed that the flow can be considered as fully developed right after entering the reactor. [5,6] Moreover, calculation of the entrance length showed that the flow can be considered as fully developed right after entering the reactor.…”

Section: Model Developmentmentioning

confidence: 99%

“…Gas phase photo-dissociation of volatile organic compounds (VOCs) with a low-pressure mercury UV lamp, [2] the destruction of chlorobenzene (C 6 H 5 Cl), [3] the UV photo-oxidation of chloroform (CHCl 3 ) and carbon tetrachloride (CCl 4 ), [4] benzene (C 6 H 6 ), [5] and H 2 S and NO x [6] are examples of these modelling research studies. Gas phase photo-dissociation of volatile organic compounds (VOCs) with a low-pressure mercury UV lamp, [2] the destruction of chlorobenzene (C 6 H 5 Cl), [3] the UV photo-oxidation of chloroform (CHCl 3 ) and carbon tetrachloride (CCl 4 ), [4] benzene (C 6 H 6 ), [5] and H 2 S and NO x [6] are examples of these modelling research studies.…”

mentioning

confidence: 99%

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Modelling methane and ethane photolysis in waste gas: Optimization of reaction networks

Asili

Visscher

2018

Can J Chem Eng

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A mechanistic model for the ultraviolet degradation of methane and ethane in waste gas was developed with the focus on reaction network development and optimization. The research serves a dual purpose of removing natural gas condensate emissions, and converting condensates to added-value products. A comprehensive reaction network including all possible reactions was developed, and kinetic constants were taken from the literature or estimated based on analogues. Overall, 162 reactions were included for the most complete case. Next, the model was screened for reactions that did not affect the simulation results. As complexity increases, it was shown that the model devotes an increasing fraction of time calculating reactions that are negligible in the overall process. Based on the simulation results it is expected that the model can be extended to higher alkanes with a reasonable run-time in addition to keeping precise simulation results. The model predicts that high ethane conversion is possible while maintaining low methane conversion, and it is expected that this effect will be even more pronounced in the presence of higher alkanes. Overall, the projected model can be used to establish the feasibility of converting natural gas condensates to value-added products without degrading its main content, methane; provided that oxygen and water vapour are available for the oxidation.

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Section: Radiation Field Modelsupporting

confidence: 80%

Section: Model Developmentmentioning

confidence: 99%

Section: Model Developmentmentioning

confidence: 99%

Section: Model Developmentmentioning

confidence: 99%

mentioning

confidence: 99%

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Modelling methane and ethane photolysis in waste gas: Optimization of reaction networks

Asili

Visscher

2018

Can J Chem Eng

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Identification of intermediate compounds and photodegradation mechanisms of omeprazole under the system UV/O₂

Leyva

Baines

Noriega

et al. 2019

J of Physical Organic Chem

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The photodegradation of the proton pump inhibitor omeprazole (OME) in aqueous media with the system UV/O 2 is presented. The photodegradation rate was assessed by HPLC and UV-vis spectroscopy, while the mineralization rate was obtained by TOC measurements. Degradation products were investigated by IR spectroscopy and GC-MS analysis. UV-vis absorbance and HPLC results indicated that OME is completely degraded within 3 minutes of irradiation.TOC analysis indicated that intermediates compounds are relatively easy to mineralize since 80% mineralization is achieved within 2 hours. IR studies demonstrated a rapid oxidation of OME leading to the formation of amines and both sulfonic and carboxylic acids. GC-MS data indicated that the initial photoproducts are derivatives of both benzimidazole and pyridine produced after the photochemical cleavage of the C-S bond. Plausible mechanisms for the direct and indirect degradation of OME are given. In the photochemical degradation of OME, many intermediate compounds are actually generated. Several of them were generated from hydroxyl radical reactions, but some of them resulted from rearrangements, reductive reactions, and through the formation of highly reactive intermediates such as pseudo carbene, thiooxirane, and sulfenamide.

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Continuous in situ portable SERS analysis of pollutants in water and air by a highly sensitive gold nanoparticle-decorated PVDF substrate

et al. 2021

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Benzene degradation in waste gas by photolysis and photolysis-ozonation: experiments and modeling

Cited by 17 publications

References 40 publications

Modelling methane and ethane photolysis in waste gas: Optimization of reaction networks

Modelling methane and ethane photolysis in waste gas: Optimization of reaction networks

Identification of intermediate compounds and photodegradation mechanisms of omeprazole under the system UV/O₂

Continuous in situ portable SERS analysis of pollutants in water and air by a highly sensitive gold nanoparticle-decorated PVDF substrate

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Benzene degradation in waste gas by photolysis and photolysis-ozonation: experiments and modeling

Cited by 17 publications

References 40 publications

Modelling methane and ethane photolysis in waste gas: Optimization of reaction networks

Modelling methane and ethane photolysis in waste gas: Optimization of reaction networks

Identification of intermediate compounds and photodegradation mechanisms of omeprazole under the system UV/O2

Continuous in situ portable SERS analysis of pollutants in water and air by a highly sensitive gold nanoparticle-decorated PVDF substrate

Contact Info

Product

Resources

About

Identification of intermediate compounds and photodegradation mechanisms of omeprazole under the system UV/O₂