title: Thermal decomposition of hydroxylamine: isoperibolic calorimetric measurements at different conditions.
abstract: Thermal decomposition of hydroxylamine, NH2OH, was responsible for two serious accidents. However, its reactive behavior and the synergy of factors affecting its decomposition are not being understood. In this work, the global enthalpy of hydroxylamine decomposition has been measured in the temperature range of 130-150 °C employing isoperibolic calorimetry. Measurements were performed in a metal reactor, employing 30-80 ml solutions containing 1.4-20 g of pure hydroxylamine (2.8-40 g of the supplied reagent). The measurements showed that increased concentration or temperature, results in higher global enthalpies of reaction per unit mass of reactant. At 150 °C, specific enthalpies as high as 8 kJ per gram of hydroxylamine were measured, although in general they were in the range of 3-5 kJ g(-1). The accurate measurement of the generated heat was proven to be a cumbersome task as (a) it is difficult to identify the end of decomposition, which after a fast initial stage, proceeds very slowly, especially at lower temperatures and (b) the environment of gases affects the reaction rate.
authors: Department of Environmental and Natural Resources Management, University of Western Greece (formerly of University of Ioannina), Seferi 2, Agrinio GR30100, Greece.
authors: Theodora
authors: T
authors: Adamopoulou
authors: Department of Environmental and Natural Resources Management, University of Western Greece (formerly of University of Ioannina), Seferi 2, Agrinio GR30100, Greece. Electronic address: mpapadak@cc.uoi.gr.
authors: Maria I
authors: MI
authors: Papadaki
authors: Department of Environmental and Natural Resources Management, University of Western Greece (formerly of University of Ioannina), Seferi 2, Agrinio GR30100, Greece.
authors: Manolis
authors: M
authors: Kounalakis
authors: Mary Kay O'Connor Process Safety Center, Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.
authors: Victor
authors: V
authors: Vazquez-Carreto
authors: Mary Kay O'Connor Process Safety Center, Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.
authors: Alba
authors: A
authors: Pineda-Solano
authors: Department of Fire Protection & Safety and Department of Chemical Engineering, Oklahoma State University, 494 Cordell South, Stillwater, OK 74078, USA.
authors: Qingsheng
authors: Q
authors: Wang
authors: Mary Kay O'Connor Process Safety Center, Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.
authors: M Sam
authors: MS
authors: Mannan
mesh_terms: D002151:Calorimetry; D015386:Hazardous Substances / Q000737:chemistry*; D006358:Hot Temperature; D019811:Hydroxylamine / Q000737:chemistry*; D012996:Solutions; D014867:Water / Q000737:chemistry
chemical_list: D015386:Hazardous Substances; D012996:Solutions; D014867:Water; D019811:Hydroxylamine