Abstract Microfluidic reaction devices are a very promising technology for chemical and biochemical processes. In microreactors, the micro dimensions, coupled with high surface area/volume ratio, permit rapid heat exchange mass transfer, resulting in higher yields rates than conventional reactors. Moreover, lower energy consumption easier separation of products these systems to have environmental impact compared macroscale, Due benefits, use microreactors is increasing biocatalysis field,...

Abstract Photochemical reactors tend to exhibit turbulent flow even with low Reynolds numbers. The k‐ϵ model is not always appropriate in this situation. An annular photoreactor was designed tangential inlet and outlet tubes investigate this. fluid characterized by residence time distribution (RTD) experiments, which were reproduced computational dynamics considering four relevant turbulence models: the , k‐ω shear stress transport, models. Inlet effects induced helical throughout reactor,...

Abstract This work evaluates the spatial distribution of normalised rates droplet breakage and coalescence in liquid–liquid dispersions maintained agitated tanks at operation conditions normally used to perform suspension polymerisation reactions. Particularly, simulations are performed with multiphase computational fluid dynamics (CFD) models represent flow field styrene reactors for first time. CFD tools compute turbulent energy dissipation (ε) inside reaction vessel; afterwards, particle...

The modeling, analysis, and simulation validation of an industrial-scale depropenizer column (Refinaria de Capuava, Mauá, São Paulo) owned by Petrobras S.A. are carried out using equation-oriented sequential modular approaches. model implemented in the environment proved to be suitable for real-time optimization (RTO) applications due its robustness, fast convergence, ability represent real process. analysis allows better understanding process establishment boundaries specifications...

Abstract Microreactors eliminate batch‐to‐batch variability and allow better control over nanocrystal synthesis. A serpentine microreactor fabricated by femtosecond laser ablation is presented characterized computational fluid dynamics, since the micro channels show a trapezoidal cross‐section mainly due to relatively high numerical aperture of focusing lens. Mixing, macro micro, throughout device was investigated for inlet flow rates between 10–500 μL min −1 injection an inert tracer with...

O poli (metil azoteto de glicidila) - GAP é um material energético que pode ser utilizado como aglutinante (binder) e plastificante em compostos explosivos propulsores foguetes. Neste trabalho, foi abordada a síntese do (GAP) através da conversão direta epicloridrina (ECH) GAP. Os reagentes utilizados foram azida sódio, vários álcoois extensores cadeias, o etanodiol, 1,4-butanodiol, dietilenoglicol glicerol. Alguns parâmetros operação avaliados, tempo reação, proporção entre os reagentes,...

Abstract The transport of heavy oil in tubes is energy intensive since the viscosity can reach values 10 500 000 cP. This study focuses on a piping system by an annular flow wrapped with water, this alternative reduces head loss. was comprised horizontal tubes, curves, and vertical tubes. assumptions for CFD simulation were following: 3D geometry, turbulent flow, isothermal as well incompressible, steady‐state, transient flow. A mesh convergence carried out. residue pressure velocity dropped...

O poli (metil azoteto de glicidila) - GAP é um material energético que pode ser utilizado como aglutinante (binder) e plastificante em compostos explosivos propulsores foguetes. baixo peso molecular obtido pela conversão direta da epicloridrina (ECH) a GAP. Neste trabalho, proposto possível mecanismo para esta direta, fundamentado análises infravermelho espécies intermediárias.

Abstract Residence time distributions were evaluated experimentally for three tubular solution polymerization reactors to analyze aspects of the fluid‐dynamic behavior these reactors. The analysis available experimental data indicates that flow characteristics may be subject stochastic perturbations. A model is then proposed by assuming a viscous polymer layer formed in proximities reactor walls and plugs material are released at random during operations. This able represent fairly well with...

Abstract The concentration profiles of species involved in the degradation phenol by an advanced oxidation process (AOP) are modeled a computational fluid dynamics tool annular reactor whose was object previous study. reactive flow fully described together with radiation field and kinetic model, which encompasses large constants such as 10 L mol −1 s . Phenol can be simulated using relaxation factors at least 12 kg m −3 hydroxyl radical profile depends on field, assessed discrete ordinate...

Soybean peroxidase is an enzyme extracted from soybean seed hulls. In the presence of hydrogen peroxide, has potential to catalyze biodegradation toxic substances like chlorophenols. For this reason, its use in wastewater treatment processes environmentally friendly since can be obtained a renewable and abundant raw material. work, enzymatic 2,4,6-trichlorophenol performed by microreactor was studied experimentally theoretically. The experimental data set with volume 250 μL using different...

Abstract One of the difficulties related to oil exploration is transporting heavy since its high viscosity causes high‐pressure drop and energy consumption. In order save energy, core annular flow (CAF) can be applied where a two‐phase occurs, with peripheral water flowing offering reduction in expenditure. The multiphase was studied experimentally simple purpose‐built unit. To theoretically handle CAF, computational fluid dynamics simulations were done commercial package Ansys Fluent....

Most recently, the production of polystyrene by Free Radical Polymerization (FRP) via microchannels has been a subject core interest due to efficiency micro-or milli-reactor brings. In addition, especially in pilot experimentations, micro or known widely be efficient monitoring microstructural end-use features properties polymer as chain propagates and ultimately terminates. However, limitations posed using milli-reactors process intensification such clogging pores can bottleneck when...