Details

Autor(en) / Beteiligte

• Willms, Thomas
• Kryk, Holger
• Oertel, Jana
• Lu, Xiang
• Hampel, Uwe

Titel

Reactivity of t-butyl hydroperoxide and t-butyl peroxide toward reactor materials measured by a microcalorimetric method at 30 °C

Ist Teil von

• Journal of thermal analysis and calorimetry, 2017-04, Vol.128 (1), p.319-333

Ort / Verlag

Dordrecht: Springer Netherlands

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• To investigate the oxidation of isobutane to t -butyl hydroperoxide (TBHP) for the first time as a two-phase process in a microreactor in a broad range of flow rates (isobutane flow rate: 15–188 µL min −1 , oxygen: 0.1–1.5 mL min −1 ), temperatures (75–150 °C) and pressures (25–100 bar), a study has been performed to select the most appropriate construction materials for the experimental facility, especially for the microreactor but also for fittings, sealings, sensors, pumps, tubes, the sampling unit, etc. TBHP, as most hydroperoxides, is quite reactive and reacts with most metals, polymers, acids and bases. Therefore, the materials most appropriate had to be determined to minimize losses of TBHP in the initiator pump and in the reaction mixture of the sample at ambient temperature. As TBHP decomposes very slowly under such conditions, a microcalorimetric method has been used to measure the heat production of TBHP in contact with selected materials at 30 °C. Among those materials, various metals, e.g., copper, gold, silver, zinc, aluminum, titanium, tantalum, normal steel, Hastelloy C276, Hastelloy C-2000, V4A steel, and semiconductors like silicon and silicon carbide have been tested. Furthermore, several polymers like nitrile butyl rubber, PEEK, silicone, Chemraz ® and PTFE have been studied. Moreover, the role of metals and metal ions as catalysts for the decomposition of TBHP and DTBP is discussed. The experiments showed that silver and copper are the most reactive metals of the investigated substances and silicon the most suitable coating material for the reactor. The most stable polymers were found to be PEEK and PTFE.