caa a22 4500 463188837 CHVBK 20180406164902.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1007/s10973-006-8058-4 doi (NATIONALLICENCE)springer-10.1007/s10973-006-8058-4 Comparativeevolved gas analyses on thermal degradation of thiourea by coupled TG-FTIRand TG/DTA-MS instruments [Elektronische Daten] [J. Madarász, G. Pokol] Identification and monitoring of gaseous species released during thermal decomposition of pure thiourea, (NH2)2C=S in argon, helium and air atmosphere have been carried out by both online coupled TG-FTIR and simultaneous TG/DTA-MS apparatuses manufactured by TA Instruments (USA). In both inert atmospheres and air between 182 and 240°C the main gaseous products of thiourea are ammonia (NH3) and carbon disulfide (CS2), whilst in flowing air sulphur dioxide (SO2) and carbonyl sulphide (COS) as gas phase oxidation products of CS2, and in addition hydrogen cyanide (HCN) also occur, which are detected by both FTIR spectroscopic and mass spectrometric EGA methods. Some evolution of isothiocyanic acid (HNCS) and cyanamide (NH2CN) vapours have also observed mainly by EGA-FTIR, and largely depending on the experimental conditions. HNCS is hardly identified by mass spectrometry. Any evolution of H2S has not been detected at any stage of thiourea degradation by either of the two methods. The exothermic heat effect of gas phase oxidation process of CS2 partially compensates the endothermicity of the corresponding degradation step producing CS2. Springer-Verlag, 2007 coupled TG/DTA-EGA-MS nationallicence coupled TG-EGA-FTIR nationallicence EGA nationallicence simultaneous TG/DTA nationallicence thiourea nationallicence Madarász J. Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1521, Budapest, Hungary aut Pokol G. Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1521, Budapest, Hungary aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 88/2(2007-05-01), 329-336 1388-6150 88:2<329 2007 88 10973 https://doi.org/10.1007/s10973-006-8058-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-8058-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Madarász J. Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1521, Budapest, Hungary aut NATIONALLICENCE 700 1- Pokol G. Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1521, Budapest, Hungary aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 88/2(2007-05-01), 329-336 1388-6150 88:2<329 2007 88 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer