By Almeida-Rivera C. P.
The conceptual layout of reactive distillation tactics is investigated during this PhD thesis. the incentive for this study got here from taking a sustainable life-span viewpoint on conceptual layout, within which economics and capability losses over the method existence span have been considered. The technological and clinical eventualities utilized in this learn are defined during this bankruptcy. First, the drivers for switch within the present dynamic atmosphere of chemical processing are identified.Then the reactive distillation processing is brought. The generalities of this method including its technical demanding situations in layout and operation are addressed. The medical environment of conceptual layout in approach platforms engineering, with an emphasison the main demanding situations within the layout of reactive distillation is addressed. The scope of this thesis is then brought, including an announcement of the medical questions handled within the thesis. The bankruptcy is concluded with a thesis define and a concise description of the medical novelty of this study.
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Additional info for Designing Reactive Distillation. Processes with Improved Efficiency
It is relevant to mention that an alternative concept might be used to depict the phase equilibrium: residue curve (Fien and Liu, 1994; Westerberg and Wahnschaﬀt, 1996). In contrast to distillation lines, residue curves track the liquid composition in a distillation unit operated at ﬁnite reﬂux. Although for ﬁnite columns distillation and residue lines diﬀer slightly, this diﬀerence is normally not signiﬁcant at the ﬁrst stages of design. Graphically, the tangent of a residue curve at liquid composition x intercepts the distillation line at the vapor composition y in phase equilibrium with x (Fien and Liu, 1994).
In this extended contribution a total of 25 qualitatively diﬀerent bifurcation diagrams are identiﬁed. Moreover, the eﬀect of system properties on multiplicity regions is covered. 2 Implications of Multiplicity In the previous subsection multiplicity in RD has been described and possible causes have been discussed. This subsection addresses the consequences of multiplicity from an industrial point of view. Undesired situations can be encountered in RD processing due to multiplicity, namely, • Start-up operation: if more than one stable steady state is possible for a certain set of operating conditions, an undesired steady state can be reached if the initial conditions are unsuitable.
35) where ξ is the total friction factor, which is composed of all independent contributions due to V/V, V/L and direction change friction. , 2004). Thus, the generic correlation for the contact area between phases is, aΨ = fa (M ). e. aLV , aLS and aV S ) in particular when incomplete wetting occurs. 37) φp = fφ (geometry, M ). 41) where ff r is the two-phase friction factor. Attaining control of the unit hydrodynamics involves the deﬁnition of a set of key decision variables: packing parameters (geometry and functionality) and ﬂow regime of the involved phases.