TY - CONF A1 - Schulte, Petra T1 - Predicting explosive properties N2 - This presentation focuses on the possibilities of the QSAR (Quantitative Structure-Activity Relationship) tools to access hazard properties using simulation techniques including the FAIR (Findable, Accessible, Interoperable, Reusable) data principles. T2 - IGUS: Energetic and Oxidizing Substances Working Group (EOS) CY - Stockholm, Sweden DA - 20.09.2022 KW - QSAR Toolbox KW - Explosive properties KW - Energetic materials KW - Friction sensitivity KW - Impact sensitivity KW - Thermal stability PY - 2022 AN - OPUS4-56436 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schulte, Petra T1 - DSC measurements proficiency test N2 - Differential Scanning Calorimetry (DSC) may be used to avoid testing for explosive and self-reactive properties according to the legal regulations of chemicals substances and dangerous goods. Demonstrated measured exothermic decomposition energy value significantly affected by numerous factors - choice of sample vessel, sample mass, baseline shape, peak shape, heating rate. T2 - IGUS: Energetic and Oxidizing Substances Working Group (EOS) CY - Stockholm, Sweden DA - 20.09.2022 KW - Dangerous Goods KW - Classification KW - DSC KW - Exothermic decomposition energy KW - Explosive properties KW - Energetic materials PY - 2022 AN - OPUS4-56437 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schulte, Petra T1 - UN Test N.1 - Test method for flammable solids N2 - This presentation focuses on the test procedure for assessing the flammability hazard for an appropriate classification according to GHS classification. A comparison of test descriptions shows that the performance of the test should be improved so that a consistent evaluation would be achieved. T2 - IGUS: Energetic and Oxidizing Substances working group (EOS) CY - Stockholm, Sweden DA - 20.09.2022 KW - Dangerous Goods KW - Classification KW - UN Test N.1 KW - Test methods KW - Flammability KW - GHS PY - 2022 AN - OPUS4-56438 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Afraz, N. A1 - Adi, A. A1 - Hecht, Kristin T1 - Gas/liquid mass transport in falling film reactor versus theory N2 - Introduction: Mass transport at gas/liquid interfaces depends on many factors including the gas and liquid properties and hydrodynamics. The mass transport of a gas through the liquid is a limiting step in many chemical reactions. To gain a fundamental understanding of multiphase interfaces, the rate of mass transfer has been measured for pure gases (H2, N2, O2, He) into a thin liquid film with a well-defined surface area and velocity profile. This enables the mass transfer rate to be broken down into one parameter, which is the gas/liquid interfacial area (a), and a second parameter, which is the mass transfer coefficient (kL). Using gases with varying diffusion coefficients enables a comparison of the measured rates of mass transport to the rates predicted by film theory and penetration theory. Method: A gravity-driven thin water film 0.000180 m in thickness flowing along the outer surface of a capillary was contacted with a gas phase inside a closed system. The liquid was circulated continuously until it was saturated with gas and the equilibrium pressure was reached. In this device, there is laminar flow, and therefore, the hydrodynamics of the liquid film are well defined. Results: Penetration theory predicts a non-linear relationship between diffusion coefficient (DAB) and mass transfer coefficient (kL). by means of falling film reactor the actual rates of gas-liquid mass transfer are higher than those predicted by theory. Also, a linear relationship between DAB and kL is observed experimentally. The mass transfer coefficient can even, as a rule of thumb, be assumed to be relatively constant with a value of around 10-4 m/s for aqueous solutions. T2 - 13th European Congress of Chemical Engineering (ECCE) CY - Online meeting DA - 20.09.2021 KW - Mehrphasenströmung KW - Stofftransport KW - Wasserstoff PY - 2021 AN - OPUS4-53679 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Petzold, M. A1 - Afraz, N. A1 - Hecht, Kristin A1 - Böhm, L. A1 - Kraume, M. T1 - G/L Mass Transfer Phenomena in Micellar Emulsion Systems N2 - Introduction: Homogenously catalyzed reactions in multiphase systems, as they are used for example for the hydroformylation or reductive amination, offer a promising approach to produce base chemicals from renewable resources. The organic and gaseous educts react with the catalyst, which is designed to be soluble in water to provide a good separation from the likewise organic products. In the resulting gas/liquid/liquid systems, the reaction is controlled through interfacial and transport phenomena. These processes fail for long chained olefins – e.g. vegetable oils and fats – because of their low solubility in water. Therefore, surfactants can be added as an emulsifier to form micellar emulsion systems (MES) [1], increase reaction speed [2] and facilitate phase separation [3]. These systems form up to three liquid phases, depending on temperature and composition. For fast reactions, the gas/liquid mass transfer plays an important role. Due to the multiple phases present, the dispersion conditions of the particles and the resulting mass transfer are complex. Methods: In this work, the mass transfer in MES is investigated. For simplicity, only the non-reactive material system without catalyst consisting of water, dodecane and the non-ionic surfactant Marlophen NP8 was investigated. Hydrogen was applied as gas phase. The phase behavior of the MES was characterized using settling experiments and by measuring the conductivity of the emulsions [4]. The mass transfer experiments were conducted in two different setups employing the dynamic pressure method. In a pressurized stirred tank reactor, the mass transfer performance of the whole MES was determined under the complex dispersion conditions and a variety of different system parameters by measuring the volumetric mass transfer coefficient (kLa). The specific transfer area (a) was determined measuring gas hold-up and using optical endoscope measurements [5] to record bubble sizes. The non-spherical bubbles were analyzed with a trained convolutional neural network [6]. Using a falling film capillary in a closed pressurized system [7], the mass transfer of the single phases appearing in MES were quantified. The phases were removed and investigated separately after the settling experiments. A gravity-driven laminar flow with well-defined transfer area was established along the capillary and by measuring the pressure drop over time the mass transfer coefficient (kL) could be calculated. Results: The mass transfer coefficients of hydrogen in the single phases of the micellar emulsion system covered a broad range. The kL of the aqueous phase was similar to pure water, while the third, bi-continuous phase forming in MES had very small kL values due to its high viscosity. The mass transfer coefficient of the organic phase was found to be far higher than of the aqueous phase. In the stirred tank reactor, different phases formed the continuous phase in the whole MES mixture for the temperature range investigated. The fastest mass transfer was found for a continuous aqueous phase below 87 °C. At higher temperatures, a phase inversion occurred, and the organic phase became continuous. The high kL of the organic phase measured in the falling film contactor did not translate directly to a higher kLa in the stirred tank reactor as the value dropped compared to an aqueous continuous phase present. The change in continuous phase were found to affect the drop and bubble sizes in the system. For an organic continuous phase, the Sauter mean diameter of the bubbles were larger and the transfer area smaller, which was the main reason for the reduced kLa. T2 - 13th European Congress of Chemical Engineering (ECCE) CY - Online meeting DA - 20.09.2021 KW - Mehrphasenströmung KW - Stofftransport KW - Wasserstoff PY - 2021 AN - OPUS4-53680 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Michael-Schulz, Heike T1 - Classification of organic peroxide and self-reactive N2 - Organic peroxide and self-reactive are classified into seven types according to their hazards. In order to determine the substance type, it is necessary to determine the properties based on test methods. The types range from type A, which is not accepted for transport in the packing in which it is tested, to type G, which is exempted from the provisions for organic peroxides or self-reactive substances. T2 - Training course of the European Chemicals Agency (ECHA) CY - Online meeting DA - 17.03.2021 KW - Organische Peroxide KW - Selbstzersetzliche Stoffe KW - Peressigsäuren KW - Self reactive substances KW - Organic peroxides KW - Peroxyacetic acids PY - 2021 AN - OPUS4-53177 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fayet, G. A1 - Wehrstedt, Klaus-Dieter A1 - Knorr, Annett A1 - Rotureau, P. T1 - First models to predict thermal decomposition properties of possible self-reactive substances based on industrial datasets N2 - Self-reactive substances are unstable chemical substances which can easily decompose and may lead to explosion. For this reason, their thermal stability properties are required within regulatory frameworks related to chemicals in order to assess their hazardous properties. Due to the fast development and availability of computers, predictive approaches like QSPR models are increasingly used in the evaluation process of hazardous substances complementary to experiments. In that context, the HAZPRED project (2015-2018) aimed to develop QSPR models to predict physical hazards of substances to fill the lack of knowledge on these hazardous substances quickly. An experimental campaign, based on 50 samples provided by Industrial producers, was carried out on potential self-reactive substances, for which no QSPR model already existed. Their heats of decomposition were characterized using differential scanning calorimetry in homogeneous experimental conditions. QSPR models were derived using the GA-MLR method (using a genetic algorithm and multi-linear regressions) using molecular descriptors calculated by Dragon software based on both 3D molecular structures from density functional theory (DFT) optimizations, to access three-dimensional descriptors, and SMILES codes, favoring the access to simpler models, requiring no preliminary quantum chemical calculations. All models respected the OECD validation guidelines for regulatory acceptability of QSPR models. They were tested by internal and external validation tests and their applicability domains were defined and analyzed. If improved models should be expected with larger database (and a better ratio between size and chemical diversity), these first models already represent a screening tool capable to access early reactive hazards. T2 - 19th International Workshop on Quantitative Structure-Activity Relationships in Environmental and Health Sciences CY - Online meeting DA - 07.06.2021 KW - QSPR KW - Self-reactive substances KW - Thermal decomposition PY - 2021 AN - OPUS4-53178 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schulte, Petra T1 - Physikalische Gefahren: Einstufungskriterien, Prüfmethoden, Vergleich mit Gefahrgutvorschriften N2 - Vorgehensweise und Verfahren für die Validierung von Informationen zur Bewertung der Eigenschaften von Stoffen und Gemischen, die zu einer Einstufung und Kennzeichnung der physikalischen Gefahren nach der CLP-Verordnung (Verordnung (EG) Nr. 1272/2008) führen. T2 - Haus der Technik: GHS/CLP Basisseminar - Einstufen und Kennzeichnen mit dem GHS (CLP-Verordnung) CY - Online meeting DA - 01.06.2021 KW - Einstufung KW - Kennzeichnung KW - GHS KW - CLP KW - Prüfmethoden KW - Gefahrenklasse KW - Gefahreneigenschaften PY - 2021 AN - OPUS4-53184 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Lüth, Peter A1 - Uhlig, S. A1 - Frost, K. A1 - Malow, Marcus A1 - Michael-Schulz, Heike A1 - Schmidt, Martin A1 - Zakel, Sabine T1 - CEQAT-DGHS interlaboratory tests for chemical safety: Validation of laboratory test methods by determining the measurement uncertainty and probability of incorrect classification including so-called “Shark profiles” N2 - Laboratory test results are of vital importance for correctly classifying and labelling chemicals as “hazardous” as defined in the UN Globally Harmonized System (GHS) / EC CLP Regulation or as “dangerous goods” as defined in the UN Recommendations on the Transport of Dangerous Goods. Interlaboratory tests play a decisive role in assessing the reliability of laboratory test results. Interlaboratory tests performed over the last 10 years have examined different laboratory test methods. After analysing the results of these interlaboratory tests, the following conclusions can be drawn: 1. There is a need for improvement and validation for all laboratory test methods examined. 2. To avoid any discrepancy concerning the classification and labelling of chemicals, the use of validated laboratory test methods should be state of the art, with the results accompanied by the measurement uncertainty and (if applicable) the probability of incorrect classification. This paper addresses the probability of correct/incorrect classification (for example, as dangerous goods) on the basis of the measurement deviation obtained from interlaboratory tests performed by the Centre for quality assurance for testing of dangerous goods and hazardous substances (CEQAT-DGHS) to validate laboratory test methods. This paper outlines typical results (e.g. so-called “Shark profiles” – the probability of incorrect classification as a function of the true value estimated from interlaboratory test data) as well as general conclusions and steps to be taken to guarantee that laboratory test results are fit for purpose and of high quality. T2 - 13th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions (ISHPMIE 2020) CY - Brunswick, Germany DA - 27.07.2020 KW - Dangerous goods KW - Hazardous substances KW - Interlaboratory test KW - Test method KW - Validation KW - Quality assurance KW - Measurement uncertainty KW - Incorrect classification KW - Shark profiles PY - 2021 U6 - https://doi.org/10.1016/j.jlp.2021.104532 SN - 0950-4230/ VL - 72 SP - 104532 PB - Elsevier Ltd. AN - OPUS4-52751 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schulte, Petra T1 - Physikalische Gefahren: Einstufungskriterien, Prüfmethoden, Vergleich mit Gefahrgutvorschriften N2 - Vorgehensweise und Verfahren für die Validierung von Informationen zur Bewertung der Eigenschaften von Stoffen und Gemischen, die zu einer Einstufung und Kennzeichnung der physikalischen Gefahren nach der CLP-Verordnung (Verordnung (EG) Nr. 1272/2008) führen. T2 - Haus der Technik e.V.: GHS/CLP Basisseminar - Einstufen und Kennzeichnen mit dem GHS (CLP-Verordnung) CY - Wolfsburg, Germany DA - 06.09.2022 KW - Einstufung KW - Kennzeichnung KW - GHS KW - CLP KW - Prüfmethoden KW - Gefahrenklasse KW - Gefahreneigenschaften PY - 2022 AN - OPUS4-55589 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -