Chemical Engineering

Vent sizing of cumene hydroperoxide (CHP) system under fire scenario considering emergency flooding measure
Cumene hydroperoxide (CHP) can release large amounts of thermal energy and result in high temperature and pressure during runaway reactions. Calorimeters and related methodologies have been made for preventing runaway reactions of CHP. However, protective measures such as flooding and emergency relief system have not been studied intensively to protect CHP systems from runaway reactions of CHP....


Superhydrophobic polymeric coatings produced by rapid expansion of supercritical solutions combined with electrostatic deposition (RESS-ED)
In this paper we present a method to produce superhydrophobic polymeric coatings by combining the rapid expansion of supercritical solutions (RESS) with electrostatic deposition (ED). A copolymer, poly(vinyl acetate)-poly(vinyl pivalate) was dissolved in a mixture of supercritical carbon dioxide and acetone and sprayed through a nozzle with an applied voltage of 8kV onto a surface placed on a e...
Predicting and measuring repulsive van der Waals forces for a Teflon AF™–solvent–α-alumina system
The force interaction of an α-alumina particle against Teflon AF™ in the presence of several non-polar and polar solvents was quantified. Solvents were chosen based on calculation of a negative Hamaker constant, indicating a repulsive van der Waals interaction. These results were compared to those predicted by theoretical models for van der Waals forces. Measured forces for the non-polar sol...


The effect of liquid fuel doping on PAH and soot formation in counterflow ethylene diffusion flames
The characteristics of the formation of polycyclic aromatic hydrocarbon (PAH) and soot in counterflow diffusion flames of n-heptane/ethylene, ethanol/ethylene, benzene/ethylene, and toluene/ethylene mixtures were investigated experimentally. Laser-induced incandescence (LII) and laser-induced fluorescence (LIF) techniques were used to measure the relative soot volume fractions and PAH concentra...
Insights into durable NiCo catalysts on β-SiC/CeZrO2 and γ-Al2O3/CeZrO2 advanced supports prepared from facile methods for CH4–CO2 dry reforming
This study explores CeZrO2 deposited over commercial β-SiC, and a highly ordered 3D β-SiC synthesised in the laboratory via electrophoretic deposition, as well as γ-Al2O3 in order to prepare three types of dual support for NiCo bimetallic catalyst in CH4–CO2 dry reforming (DR). CeZrO2 was deposited over γ-Al2O3 and β-SiC by dry impregnation (DI), wet impregnation (WI) and 2-step depositi...


Manganese oxide octahedral molecular sieve (OMS-2) as an effective catalyst for degradation of organic dyes in aqueous solutions in the presence of peroxymonosulfate
Cryptomelane type manganese oxide OMS-2 was prepared and tested in heterogeneous activation of peroxymonosulfate (PMS) for Acid Orange 7 (AO7) degradation in aqueous solutions. X-ray diffraction, scanning electron microscopy, N2 adsorption/desorption isotherms, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), and electron spin resonance spectroscopy (ESR) were us...
Enhanced catalytic activity of potassium-doped graphitic carbon nitride induced by lower valence position
The potassium doped graphitic carbon nitride (K-C3N4) photocatalysts were prepared via thermal polymerization of dicyandiamide and KI in atmosphere. The valence band (VB) position of g-C3N4 was decreased via potassium doping, resulting in enhanced separation and immigration of photogenerated carriers under visible light. The optimum K-C3N4 exhibited obviously enhanced photocatalytic activities ...

Adsorption of protein onto double layer mixed matrix membranes
This work proposed a novel approach for protein purification by using double layer mixed matrix membranes (MMMs). The double layer MMMs consisting of an active support and separating layer were prepared by co-casting two polymer solutions onto a glass plate. The active support layer consisted of nano hydroxyapatite (HAP) particles embedded in macroporous polyether sulfone (PES) and the separati...
Influence of the type of enteric coating suspension, coating layer and process conditions on dissolution profile and stability of coated pellets of diclofenac sodium
In this work, diclofenac sodium pellets were produced through an extrusion/spheronization process and subsequently coated in a fluidized bed coater column with a Wurster insert. The aim of this work was to study the coating of pellets with two commercial aqueous enteric polymer suspensions, Advantia® Performance and Acryl-Eze® MP. The coating process was studied with a 23 experimental design....

Validation of an inline particle probe in a high-shear mixer for particle size determination
This paper deals with agglomeration processes in a high-shear mixer and the integration of an inline particle probe. The purpose is to determine particle size distribution continuously in real-time. High-shear mixers rotate with a very high mixing tool speed. As a result, not only a mixing effect, but also a granulating effect (under certain conditions) is obtained. This granulating effect is t...
An experimental investigation of electrostatic precipitation in a wire–cylinder configuration at high temperatures
High-temperature electrostatic precipitation is a potentially convenient method for hot gas clean-up. This paper reports the characteristics of electrostatic precipitation in a wire–cylinder configuration for a temperature range of 350°C to 700°C. Three parameters, i.e., particle collection efficiency, energy consumption index and the outlet mass concentration of particles, are investigated...

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size
It is well known that particle size has a significant influence on the grid independence behaviour of fluidized bed reactor simulations carried out using the Two Fluid Model (TFM) approach. The general rule of thumb states that the cell size should scale linearly with the particle size so that the cell size is always at most a factor of 10 larger than the particle size. In this study, however, ...
Numerical simulations of flow structure and heat transfer in a central jet bubbling fluidized bed
An attempt has been made to model the flow structure and to predict heat transfer coefficients in a gas–solid bubbling fluidized bed operated with a central jet using a two fluid model with closures from the kinetic theory of granular flow. Quantities such as the fluid-to-particle heat transfer coefficient are not easily obtained practically from experiments with a high degree of accuracy the...
Micro–macro properties of quartz sand: Experimental investigation and DEM simulation
The ability to accurately simulate the realistic behavior of granular materials is one of the challenging issues of the numerical techniques. The first purpose of this study is to calibrate the microscopic properties of granular materials by Discrete Element Method (DEM). Coefficients of rolling and sliding friction as two main microscopic properties of granular material have a significant effe...
Enhanced antimicrobial activity of silver nanoparticles with controlled particle size by pH variation
Pva capped spherical silver nanoparticles (AgNPs) were synthesized at various pH conditions of reaction solution by chemical reduction method. Tuning of reaction solution pH in a narrow range could have a profound effect on particle size. The synthesized AgNPs have been characterized by studying their structural, morphological, optical and antimicrobial properties. Crystallite size decrement wi...