جستجوی مقالات مرتبط با کلیدواژه "identification" در نشریات گروه "مهندسی شیمی، نفت و پلیمر"

With the strong global increase in transportation technology and daily increase of cars, the interest in recycling of waste tires have been increased due to energy resources and environmental protection. One of the recycling methods for waste tires is pyrolysis and converting them into liquid fuels. In this study the effect of final reaction temperature and residence time on pyrolysis process and obtained liquid fuels were investigated. Among the pyrolysis products which are solids, liquids and gases, the liquids were selected for further investigation. These pyrolysis liquids were characterized by FTIR spectroscopy, and the results showed that liquids contain linear hydrocarbon more than 4 carbon moves toward aromatic component with increasing pyrolysis temperature. These findings were also confirmed by Detailed Hydrocarbon Analysis(DHA). The components of pyrolysis liquids consisted mainly of 2,3-dimethylbutene, 2-Methylbutene, t-Isobutyl-4-ethyl-benzene, and 1-m-4Isopropyl-benzene. The results also showed that the percentages of gases and liquids were increased and decreased respectively with increasing of temperature but there is no change in char percentage yields above 500°C. It is Obviouse that the maximum amount of solids is equal to the percentage of carbon black and other minerals in the rubber formulation that remain in pyrolysis. Measuring of calorific value of pyrolysis liquids showed good compatibility with commercial heating fuels.

Adsorptive desulfurization using mesoporous carbons are of the preeminent methods to meet serious international standards in case of sulfur. In this research, the absorbent CMK-3 containing nickel nanoparticles was synthesized and characterization using XRD, BET, SEM and FT-IR. The results showed that the nanostructure was formed and the despite high nickel loading, structural order is still preserved and specific surface of the synthesized samples is maintained at an acceptable level. Then, in the next step, the capability of synthesized adsorbent was carried out in various conditions, which shows the significant yield of them in both low and high temperature. In addition, the absorption yield of these nano-adsorbents was preserved after several reduction, indicating the high potential of these adsorbents in desulphurization.

Lower diamondoids, methyl and ethyl derivatives are commonly present in gas condensation reactions. In this study, all samples were collected from Gonbadly, Shourijeh, Mozdooran (North-East) gas fields. Column  chromatography and urea adduction techniques were applied for clean up. Also a precise GC/MS instrument was used for separation and identificaton of lower diamondoids. The identified lower diamondoids and their  derivates were compared in terms of mass spectra, retention times and mass chromatograms. The concentration of lower diamondoids was quantified and calculated within the range of 0.07-4.85 mg/l.