Destruction Of Benzene Research Articles

Thermal destruction of benzene

The thermal destruction of benzene in methane/air flue gas is studied experimentally using an atmospheric laminar flow reactor in laboratory scale. The reactor is operated at four different fuel equivalent ratios ( φ=0.06,0.1,0.5,3.7), and temperatures in the range from 850 to 973 K and realises a residence time of 5 s. Stable-species concentrations are measured by gas chromatography (GC) and high-pressure liquid chromatography (HPLC), where phenol, acetylene, formaldehyde, acrolein, methane and acetaldehyde are the major hydrocarbon products besides CO and CO 2. The augmentation of the temperature from 850 to 973 K increases the benzene conversion rate from 55% to 99%. The experimental results for one fuel equivalent ratio ( φ=0.5) are compared to the benzene model proposed by Emdee et al. (J. Phys. Chem. 92 (1992) 2151–2161). A fair agreement is observed for the benzene consumption and the CO production throughout the temperature range considered here. The small hydrocarbons are not very well matched, which requires further research on the sub-models. Our experimental results on laboratory scale provide a database for the modelling of benzene oxidation in waste incinerators.

Dissociation of benzene in a pulsed glow discharge

Destruction of benzene in a benzene/Ar mixture subjected to a pulsed glow discharge was studied. The destruction efficiency was much improved compared to a dc glow discharge, and the destruction efficiency increased with decreasing pulse width at a constant pulse frequency. Diagnostics experiments were conducted to elucidate the destruction mechanisms involved. The results show that excitation transfer from the metastable states of Ar to benzene in the afterglow of the discharge was primarily responsible for the destruction of benzene.

Sonochemical treatment of benzene/toluene contaminated wastewater

AbstractStudies of the destruction of benzene and toluene in water were undertaken using ultrasonic irradiation in a parallel plate Near Field Acoustic Processor (NAP). This magnetostrictive system is capable of degrading both benzene and toluene in a continuous stirred tank reactor configuration. The reaction kinetics were characterized by first order rate constants for the disappearance of the parent compound; these ranged from 2.7 × 1−3 to 3.7 × 10−2 mm−1 over an applied power density range of 0.6 to 3.6 watt mL−1 and target concentration of approximately 25 to 900 µM. The rate constant is shown to be inversely proportional to the target compound concentration, indicating higher order reaction kinetics. The conversion efficiency for the system was characterized through the “G” efficiency commonly used in radiation chemistry. The G efficiency ranged between 4 × 10−5 to 2.2 × 10−4 molecules destroyed per 100 eV of electrical energy drawn from the wall outlet. These values are comparable to those of other advanced oxidation processes. Suggestions are made regarding methods to improve this technology.

Removal and destruction of benzene, toluene, and xylene from wastewater by air stripping and catalytic oxidation

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRemoval and destruction of benzene, toluene, and xylene from wastewater by air stripping and catalytic oxidationKarl T. Chuang, Shan Cheng, and Shimin TongCite this: Ind. Eng. Chem. Res. 1992, 31, 11, 2466–2472Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992https://doi.org/10.1021/ie00011a010RIGHTS & PERMISSIONSArticle Views1135Altmetric-Citations42LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (809 KB) Get e-Alerts Get e-Alerts

Destruction of Benzene by Ultraviolet Light-Catalyzed Oxidation with Hydrogen Peroxide

The removal of low levels of hazardous organic compounds from water is often difficult and expensive by conventional treatment methods. A promising method in which pollutants are oxidized by ultraviolet (UV) light-catalyzed hydrogen peroxide has been investigated for an aromatic pollutant, benzene. The oxidations were conducted in a quartz annular reactor equipped with a 254 nm germicidal UV lamp. Benzene was more rapidly destroyed by the combination of hydrogen peroxide and UV light than by UV light alone. The rate of oxidation could be increased by increasing the concentration of hydrogen peroxide initially present in the reactor or by increasing the UV light intensity. Alkaline pH was detrimental to the reaction rate, probably because of the base-catalyzed decomposition of hydrogen peroxide. A rapid increase in the absorbance of treated benzene solutions at 254 nm was observed, and attributed to the presence of strongly absorbing aromatic oxidation intermediates. Four intermediates were identified by GC/MS and HPLC analyses. The intermediates could be removed by adding additional hydrogen peroxide and extending the treatment time.