Costin Sorin Bildea

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Design, economics, and plantwide control of a glycerol-tert-butyl alcohol (TBA) etherification plant are presented. The reaction takes place in liquid phase, in a plug flow reactor, using Amberlyst 15 as a catalyst. The products' separation is achieved by two distillation columns where high-purity ethers are obtained and a section involving extractive(More)
Reactive separation processes were recently proposed for the synthesis of fatty acid methyl esters (FAMEs), most of them making use of solid catalysts thus eliminating all conventional catalyst-related operations, improving process efficiency and reducing energy requirements. Such integrated systems require a stoichiometric reactants ratio in order to(More)
Design and control of recycle systems must be integrated at an early design stage. By placing together the pieces of the design puzzle we developed a novel methodology that allows the screening and selection of feasible integrated designs at an early stage. The generic structure is the Reactor-Separator-Recycle (R-S-R) system. Multiple steady states are(More)
Reactive separations using green catalysts offer great opportunities for manufacturing fatty esters, involved in specialty chemicals and biodiesel production. Integrating reaction and separation into one unit provides key benefits such as: simplified operation, no waste, reduced capital investment and low operating costs. This work presents a novel(More)
The derivation and applicability of reduced-order models for selection and assessment of plantwide control structures is studied. The paper demonstrates the advantage of exploiting the intrinsic structure of a chemical plant, which mirrors the decentralization of the control problem. The recommended procedure is to apply model reduction to individual units,(More)
Two different alternatives for etherification of glycerol (G) with tert-butyl alcohol (TBA) are developed and analyzed. The conventional reaction-separation-recycle system uses a plug-flow reactor to perform the reaction in liquid phase, in the presence of a heterogeneous catalyst (Amberlyst 15). The separation of the products from reactants is achieved by(More)
The problem of integrated design and control of plantwide systems coupling endothermic and exother-mic reactions is addressed. Processes simultaneously carrying on the endothermic first-order reaction A → R + Q and the exothermic second-order reaction B + Q → P are considered. As the physical properties of the species involved vary, possible flowsheets are(More)
The nonlinear behaviour of the monolithic loop reactor for Fischer-Tropsch synthesis is investigated. The model consists of non-stationary mass balance in gas, liquid and solid (catalyst) phases, together with energy balance. If the external heat-exchanger is small, the system exhibits multiple steady states and the moderate-conversion state is unstable.(More)