Stručni rad

Application of Primary Abatement Technology for Reduction of N2O Emmision in Petrokemija Nitric Acid Production

N. Zečević ; Petrokemija d. d., Kutina, Hrvatska
L. Ćosić ; Petrokemija d. d., Kutina, Hrvatska

Sažetak

Industrial nitric acid production by oxidation of gaseous ammonia with Ostwald procedure produces an unwanted by-product – colorless nitrous oxide, N₂O. As emission of N₂O represents a very serious problem due of its huge contribution to global warming, certain measures focused on its maximum reduction should be undertaken. Minimization of N₂O emission in nitric acid production can be achieved in different parts of the process flow, depending on the applied available technologies. For the abatement of N₂O emissions in Petrokemija's nitric acid production processes from the list of the best available technologies chosen were primary and secondary abatement technologies. The mentioned ensures reduction of N₂O by use of improved selective heterogeneous catalysts in the step of gaseous ammonia oxidation. Precious metals in the shape of gauzes are used as selective heterogeneous catalyst in primary technology, while in the case of secondary technology the Fe₂O₃ catalyst on Al₂O₃ support in the shape of spherical pellets is chosen. Shown is the application of primary technology for the abatement of N₂O in both nitric acid production facilities and their comparison with classical heterogeneous catalyst and preparation for the installation of secondary selective catalyst. N₂O emissions with the application of primary technology in both production facilities were reduced from 12 kg of N₂O to 7 kg of N₂O per ton of pure HNO₃. With the primary reduction in N₂O emissions the foundation was established for further reduction with the secondary technology to the final value of 0.7 kg of N₂O per ton of pure HNO₃, which represents mass concentration in the tail gas below 200 mg m-3 (at n. c.). With the applied technologies for the abatement of N₂O emissions in Petrokemija's nitric acid production the future prescribed emission limit value will be satisfied

Ključne riječi

Nitric acid; nitrous oxide; emmision

Hrčak ID:

95550

URI

https://hrcak.srce.hr/95550

Datum izdavanja:

22.1.2013.

Podaci na drugim jezicima: hrvatski

Posjeta: 1.359 *