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Shahna F.G.,Institute of Public Health Research | Golbabaei F.,Institute of Public Health Research | Darabi H.R.,Chemistry and Chemical Engineering Institute of Iran | Shahtaheri S.J.,Institute of Public Health Research
Chinese Journal of Chemical Engineering | Year: 2010

A novel bioactive foam emulsion bioreactor for benzene, toluene and xylene (BTX) contaminated air streams treatment has been developed. The gas-liquid interfacial area by biocompatible foam and driving force for mass transfer by a water immiscible organic phase were increased in this reactor. The effect of several parameters such as gas residence time, oxygen content, and organic phase concentration on bioreactor performance was studied. Experimental results showed an average elimination capacity (EC) of 220 g·m-3·h-1 with removal efficiency (RE) of 89.59% for BTX inlet concentration of 1 g·m-3 at 15 s gas residence time in the bioreactor. The statistical developed model predicted that the maximum elimination capacity of the reactor for BTX could be reached to 423.45 g·m-3·h-1. Continues operation of the bioreactor with high EC and RE was demonstrated by optimizing the operational parameters of the bioreactor. Overall the results suggest that the bioreactor developed can be very effective systems to treat BTX vapors. © 2010 Chemical Industry and Engineering Society of China (CIESC) and Chemical Industry Press (CIP).

Ghorbani Shahna F.,Tehran University of Medical Sciences | Golbabaei F.,Tehran University of Medical Sciences | Hamedi J.,University of Tehran | Mahjub H.,Hamadan University of Medical Sciences | And 2 more authors.
Bioprocess and Biosystems Engineering | Year: 2010

An adapted bioactive foamed emulsion bioreactor for the treatment of benzene vapor has been developed. In this reactor, bed clogging was resolved by bioactive foam as a substitute of packing bed for interfacial contact of liquid to gaseous phase. The pollutant solubility has been increased using biocompatible organic phase in liquid phase and this reactor can be applied for higher inlet benzene concentration. Experimental results showed a benzene elimination capacity (EC) of 220 g m-3 h-1 with removal efficiency (RE) of 85% for benzene inlet concentration of 1-1.2 g m-3 at 15 s gas residence time in bioreactor. Assessment of benzene concentration in liquid phase showed that a significant amount of transferred benzene mass has been biodegraded. By optimizing the operational parameters of bioreactor, continuous operation of bioreactor with high EC and RE was demonstrated. With respect to the results, this reactor has the potential to be applied instead of biofilter and biotrickling filters. © 2009 Springer-Verlag.

Mohebbi A.R.,University of California at Santa Barbara | Herges R.,University of Kiel | Darabi H.R.,Chemistry and Chemical Engineering Institute of Iran | Nasseri S.M.,University of California at Santa Barbara | Nather C.,University of Kiel
Current Organic Chemistry | Year: 2013

Aromatic belts are hoop-shaped, π-conjugated macrocycles that form the fundamental annular segments of single-walled carbon nanotubes (SWCNTs). Syntheses of carbon nanobelts have been challenging the chemical community for several decades. The main reason probably is the possibility that their preparation could open the way to a rational chemical synthesis carbon nanotubes. Here, we reported a successful synthesis of a belt-shaped carbon nanoring, namely cyclic [6]dianthryltetraphenylacetylene ([6]CAPA), including two anthraacetylene and four phenylacetylene units. It was prepared in a six-step synthesis via cyclic [6]dianthryltetraphenylethylene ([6]CAPE),with[36]annulene periphery. © 2013 Bentham Science Publishers.

Salehi-Mobarakeh H.,Iran Polymer And Petrochemical Institute | Yadegari A.,Iran Polymer And Petrochemical Institute | Didehvar J.,Chemistry and Chemical Engineering Institute of Iran | Khakzad-Esfahlan F.,Iran Polymer And Petrochemical Institute
Journal of Polymer Engineering | Year: 2013

Ethylene-vinyl alcohol copolymers (EVOH), with appropriate barriers and processability, can be chemically modified through vinyl alcohol units. Amides and polyamides based on condensation reactions of adipoyl chloride and hexamethylenediamine were grafted onto EVOH. Grafting was characterized by contact angle measurement, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), nuclear magnetic resonance spectroscopy (NMR) and scanning electron microscopy (SEM). Amide peaks at 3302 cm-1 corresponding to -NH bond stretching and the absorption of HN-CH2 at 7.8 ppm, were observed from ATR-FTIR and NMR, respectively, as a result of grafting. SEM showed the formation of amide structures as bundles, agglomerates and needle-like particles. Differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA) showed considerable changes in onset of melt temperature, crystallinity and various transitions in grafted EVOH, showing an effective alteration in the physical properties compared with the virgin resin. Nylon grafted EVOH can be considered as a potential compatibilizer in polyethylene (PE)/polyamide blends via increasing interactions at the interface. © 2013 by Walter de Gruyter Berlin Boston 2013.

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