Thermally safe operation of liquid–liquid semibatch reactors. Part I: Single kinetically controlled reactions with arbitrary reaction order

Temperature diagrams for preventing decomposition or side reactions in liquid–liquid semibatch reactors

“…1(B). As discussed elsewhere (Maestri and Rota, 2005a), from Eqs. (7) and (8) or (9) and (10), it is evident that the single R y = (E x ) line (i.e., a line representing the functional dependence between R y and E x ) on the single boundary diagram (i.e., for Co, R H , n, m values assigned and …”

“…More details on the development and use of the boundary diagrams can be found elsewhere in the literature (c.f. Westerterp and Molga, 2004a,b;Maestri and Rota, 2005a).…”

“…These diagrams allow for a simple and fast analysis of the operating conditions of a SBR from the thermal safety point of view. However, it is worthwhile mentioning that the procedures presented in this work for the temperature diagrams and in Maestri and Rota (2005a) for the boundary diagrams allow to build the temperature and boundary diagrams for any combination of reaction phase, kinetic regime and Co, R H , n and m values. The ranges of E x and R y to which the single temperature diagram is extended are strictly related to the location and extension of the coupled boundary diagram, so that, for a given reaction phase and kinetic regime, the same sensitivity of the aforementioned ranges with respect to the Co, R H , n and m parameters can be expected for both boundary and temperature diagrams (c.f.…”

Kinetic-free selectivity control of chemical reactions leading to nonvolatile products

“…For these reasons, in order to make the mass balance approach of general application, a number of boundary diagrams should be developed, along the line presented elsewhere in the literature for the safe operation of SBRs in which exothermic reactions are performed (see for example Maestri and Rota (2005a, 2005b, 2006). …”

“…t/t dos , dimensionless time, -κ k/k R , dimensionless reaction rate constant, -ρ molar density, kmol/m 3 σ molar selectivity, -τ V r /Q, average residence time in the reactor, s χ (n B0 À n B )/n A1 , normalized conversion, -of the reactions involved and the development of a number of boundary diagrams for different reaction order kinetics as well as the identification of rules of thumb for their simplified and safe use, along the line presented elsewhere in the literature (Maestri and Rota, 2005a, 2005b, 2006. However, in this case such an approach is rather complicated, since more than one reaction occurs in the system (at least, the main one and an undesired one) and different combinations of the involved kinetic parameters should be considered.…”