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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Advances in Environmental Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: kinetic,Methyl mercaptan,Hydrogen sulfide,Impregnation,K2Wo4/Al2O3 Catalyst
- چکیده:
- چکیده انگلیسی: The kinetics of methyl mercaptan production from a reaction between methanol and hydrogen sulfide in the presence of a K2Wo4/Al2O3 catalyst was experimentally studied. Waste streams containing sulfur due to sour gas sweetening in the Nori refinery complex were used instead of pure H2S. This reaction can eliminate the emission of sulfur-containing compounds into the environment and convert them into useful products. The experiments were performed over a fixed-bed reactor at various temperatures and a pressure of 8-10 bars. The values of kinetic parameters estimated by the regression between the kinetic models and the experiments within the ranges have been reported in the literature. The activation energies for methyl mercaptan and dimethyl sulfide were 53.11 and 129.55 (kJ/mol), respectively. ASPEN simulation showed that the molar flow rates of H2S and methanol (reactants) decreased at the length of the reactor, while this trend for the products (methyl mercaptan, DMS, and H2O) was reversed. The correlation coefficients indicated that the parameters and the model were significant and reasonable for reactor design. The results showed that sulfur-containing waste streams could be used instead of pure H2S streams. This substitution not only provides a supply for replacing pure H2S streams but also contains the emission of poisonous sulfur compounds into the environment.
- انتشار مقاله: 25-06-1399
- نویسندگان: Seyed Abdolmajid Khaksar,Mortaza Zivdar,Rahbar Rahimi
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Environmental Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Biodegradation,Biofilter,Formaldehyde,Packing materials,Contaminated air
- چکیده:
- چکیده انگلیسی: The removal of formaldehyde from contaminated air was investigated via three laboratory-scale biofilters packed with different materials: a mixture of compost and woodchips (І), the natural clinoptilolite zeolite particles in the original form (II), and the mixture of zeolite/activated carbon (III). The biofilters were inoculated using aerobic sludge. The average removal efficiencies of 97.5%, 90%, and 93.5% were obtained at a 100 s empty bed residence time (EBRT) and 20 mg/m3 inlet concentration of formaldehyde for the biofilter of configurations І, II, and III, respectively. Also, the performance of the reactors was investigated at different EBRTs of 20, 30, 60, and 100 s, and the maximum elimination capacity of 2840 mg/m3.h was achieved at the lowest EBRT (20 s) for the biofilter of configuration II. Increasing the inlet formaldehyde concentration from 20 mg/m3 to 80 mg/m3 led to the maximum formaldehyde removal efficiency of 82% for the biofilter of configuration III. Therefore, a comparison of the results of the biofilters' performances showed that the biofilter of configuration III had the best performance, which was validated by obtaining a higher mass transfer coefficient. However, the biofilter of configurations II and III achieved steady-state conditions in a shorter time.
- انتشار مقاله: 26-09-1398
- نویسندگان: Elham Narooei,Davod Mohebbi-Kalhori,Abdolreza Samimi,Mortaza Zivdar
- مشاهده