Showing papers by "Giuseppe Maschio published in 2017"
TL;DR: The last part of this work is dedicated to a specific modelling of the incident through system dynamics technique using a customized framework covering technical, human and organizational aspects.
Abstract: Seveso incident happened on Saturday 10th July 1976 within the production plant of 2,4,5-trichlorophenol at the ICMESA factory represents a watershed because it gave off a specific legislation in the field of safety regarding activities subjected to Major Accident Hazards (MAH) and the handling of dangerous substances. Although the severity of the mishap, still nowadays the real cause of the accident remains, at least partially, shrouded in uncertainty and different mechanism hypotheses were proposed. These doubts could lead considering Seveso mishap as a “black swan” incident, i.e. an improbable event characterized by three peculiarities: it is not expected; it has an extreme impact; it is explainable and predictable after the fact. Further investigation appears to be essential, analyzing the available material and processing a deep analysis towards several methods, which provide different views and interpretations of the fact. To this purpose, three methods were selected: AcciMap approach; the Energy Barrier Model; the System-Theoretic Accident Model & Processes (STAMP) coupled with a dynamic approach. The last part of this work is dedicated to a specific modelling of the incident through system dynamics technique using a customized framework covering technical, human and organizational aspects.
48 citations
TL;DR: A dramatic reduction of the reaction time and an important improvement of the monomers yield using microwave irradiation have been demonstrated and the introduction of sulphur in the polyurethane backbone was effective in delaying the onset of degradation as well as the degradation rate.
Abstract: In order to prepare thermally stable isosorbide-derived thermoplastic polyurethane, the synthesis of two new chiral exo–exo configured diols, prepared from isosorbide, and two types of diphenols (b...
8 citations
TL;DR: In this article, the epoxidation of soybean oil is carried using hydrogen peroxide (H2O2) 32wt.% and acetic acid instead of the commonly used H 2O2 at 60wt.%.
Abstract: Epoxidated vegetable oils are largely employed as plasticizer instead of harmful phthalates and they represent a sustainable choice to produce lubricants and intermediates. In this work, the epoxidation of soybean oil is carried using hydrogen peroxide (H2O2) 32wt.% and acetic acid instead of the commonly used H2O2 at 60wt.% and formic acid to reduce the risk of detonation and corrosion. The efficacy of an acid catalyst (sulfuric acid) is tested. Particular attention is focussed on a proper mixing program.
1 citations
TL;DR: In this paper, a semi-empirical approach is provided by Sinnot, who provides a set of correlations by mean the heat exchange coefficient can be calculated. Each correlation is valid for only a kind of impeller.
Abstract: The study of heat exchange is fundamental to perform an accurate thermal study in a calorimetric, jacketed, stirred tank reactor. Moreover, since cooling or heating in a jacketed stirred reactor is an indispensable operation to control a process, the knowledge of the rate of the heat exchange is needed. In this way, the heat exchange coefficient should be determined with a good precision. In the literature, a theoretical semi-empirical approach is provided by Sinnot (2005), who provides a set of correlations by mean the heat exchange coefficient can be calculated. Each correlation is valid for only a kind of impeller. Several articles deal with the empirical determination of the heat exchange coefficient, as the case of Raguraman et al. (2012), Dostàl et al. (2010) or Debab et al. (2010). Essentially, all the methods are obviously based on the enthalpy balance as Eq(1):