title: Reducing NO(x) emissions from a nitric acid plant of domestic petrochemical complex: enhanced conversion in conventional radial-flow reactor of selective catalytic reduction process.
abstract: The nitric acid plant of a domestic petrochemical complex is designed to annually produce 56,400 metric tons (based on 100% nitric acid). In the present work, radial-flow spherical bed reactor (RFSBR) for selective catalytic reduction of nitric oxides (NO(x)) from the stack of this plant was modelled and compared with the conventional radial-flow reactor (CRFR). Moreover, the proficiency of a radial-flow (water or nitrogen) membrane reactor was also compared with the CRFR which was found to be inefficient at identical process conditions. In the RFSBR, the space between the two concentric spheres is filled by a catalyst. A mathematical model, including conservation of mass has been developed to investigate the performance of the configurations. The model was checked against the CRFR in a nitric acid plant located at the domestic petrochemical complex. A good agreement was observed between the modelling results and the plant data. The effects of some important parameters such as pressure and temperature on NO(x) conversion were analysed. Results show 14% decrease in NO(x) emission annually in RFSBR compared with the CRFR, which is beneficial for the prevention of NO(x) emission, global warming and acid rain.
authors: Department of Chemical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran.
authors: Hamed
authors: H
authors: Abbasfard
authors: Shiraz Petrochemical Complex, Shiraz, Iran.
authors: Seyed Hamid
authors: SH
authors: Hashemi
authors: Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Mollasadra Street, Shiraz, Iran.
authors: Mohammad Reza
authors: MR
authors: Rahimpour
authors: Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Mollasadra Street, Shiraz, Iran.
authors: Seyyed Mohammad
authors: SM
authors: Jokar
authors: Department of Chemical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran.
authors: Sattar
authors: S
authors: Ghader
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D002384:Catalysis; D002617:Chemical Industry / Q000295:instrumentation*; D004867:Equipment Design; D057232:Global Warming / Q000517:prevention & control; D008567:Membranes, Artificial; D008956:Models, Chemical; D017942:Nitric Acid / Q000138:chemical synthesis*; D009569:Nitric Oxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D011312:Pressure; D013696:Temperature
chemical_list: D000393:Air Pollutants; D008567:Membranes, Artificial; D009569:Nitric Oxide; D017942:Nitric Acid