Optimization of the UO2 kernel coating process by 2D simulation of spouted bed dynamics in the coater

2012 ◽  
Vol 251 ◽  
pp. 124-130 ◽  
Author(s):  
Malin Liu ◽  
Bing Liu ◽  
Youlin Shao
Keyword(s):  
Coating Process ◽  
Spouted Bed ◽  
2D Simulation

CFD-DEM simulation of particle coating process coupled with chemical reaction flow model

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Meng Chen ◽  
Zhao Chen ◽  
Yaping Tang ◽  
Malin Liu
Keyword(s):  
Chemical Reaction ◽  
Concentration Distribution ◽  
Coupling Model ◽  
Operating Conditions ◽  
Experimental Result ◽  
Coating Process ◽  
Spouted Bed ◽  
Desorption Process ◽  
Particle Coating ◽  
Coating Efficiency

Abstract Particle coating process, one of the main methods to improve the particle properties, is widely used in industrial production and pharmaceutical industry. For the scale up and optimization of this process, a mechanistic and detailed study is needed or numerical simulation as an alternative way. Decomposition of substances usually involves multiple chemical reactions and produces multiple substances in the actual chemical reaction. In the study, a chemical reaction flow (CRF) model has been established based on kinetic mechanism of elementary reaction, the theory of molecular thermodynamics and the sweep theory. It was established with the comprehensive consideration of the decomposition of substances, deposition process, adhesion process, desorption process, hydrogen inhibition, and clearance effect. Then the CFD-DEM model was coupled with CRF model to simulate particle coating process by FB-CVD method, and the CFD-DEM-CRF coupling model was implemented in the software Fluent-EDEM with their user definition function (UDF) and application programming interface (API). The coating process in the spouted bed was analyzed in detail and the coating behavior under different conditions were compared at the aspects of CVD rate, coating efficiency, particle concentration distribution, particle mixing index and gas concentration distribution. It is found that the average CVD rate is 6.06 × 10−4 mg/s when the inlet gas velocity is 11 m/s and bed temperature is 1273 K, and simulation result agrees with the experimental result well. Average CVD rate and coating efficiency increase with temperature increasing, but decrease acutely with mass fraction of injected hydrogen increasing. The CFD-DEM-CRF coupling model can be developed as a basic model for investigating particle coating process in detail and depth and can provide some guidance for the operating conditions and parameters design of the spouted bed in the real coating process.

scholarly journals Study of a delayed-release system for hard and soft capsules coated with eudragit® s100 acrylic polymers

2020 ◽  
Vol 42 ◽  
pp. e48422
Author(s):  
Luciana Arantes Soares ◽  
Eduardo Crema
Keyword(s):  
Palm Oil ◽  
Coating Process ◽  
Spouted Bed ◽  
Active Ingredients ◽  
Enteric Coating ◽  
Experimental Conditions ◽  
Acrylic Polymers ◽  
Release System ◽  
Delayed Release ◽  
Pharmaceutical Application

The objective of this study was to evaluate a pH-dependent system of ileocolonic release of active ingredients using the polymer Eudragit® S100. A spouted bed was used in the coating process of soft capsules containing palm oil and of hard capsules containing glutamine under standardised experimental conditions. The height and diameter of the palm oil and glutamine capsules were measured using a calliper. The following variables were analysed: Eudragit® S100 dispersion amount used in the capsule coating process, nozzle air pressure, nozzle air flow rate, spray rate and temperature of the spouted bed coating process. The Eudragit® S100 dispersion formulation, trademarked as Quickstart® by Evonik Industries, was used with modifications to prepare the enteric coating. The results showed that the adequate temperature for the spouted bed coating process was 50°C and that 0.2 mL of 6.5% Eudragit® S100 coating per cm2 capsule was resistant for 60 minutes at pH 6.8. The findings demonstrate the pharmaceutical application of Eudragit® S100 in the modification of the coating and the preparation of a delayed-release system of hard and soft capsules, thus enabling ileal release of active ingredients.

Parametrization of particle coating process with chitosan in spouted bed

2018 ◽  
Vol 38 (1) ◽  
pp. 54-62
Author(s):  
Ferreira Mariana Ávila ◽  
Pablo Daniel Freitas Bueno ◽  
Luiz Antônio de Almeida Pinto ◽  
Toni Jefferson Lopes ◽  
Carlos Alberto Severo Felipe
Keyword(s):  
Coating Process ◽  
Spouted Bed ◽  
Particle Coating

Measurement of granule layer thickness in a spouted bed coating process via optical coherence tomography

2019 ◽  
Vol 356 ◽  
pp. 139-147 ◽  
Author(s):  
Swantje Pietsch ◽  
Anna Peter ◽  
Patrick Wahl ◽  
Johannes Khinast ◽  
Stefan Heinrich
Keyword(s):  
Optical Coherence Tomography ◽  
Layer Thickness ◽  
Coating Process ◽  
Optical Coherence ◽  
Spouted Bed

Coating process of Phyllanthus niruri Linn granules using spouted bed

2018 ◽  
Vol 336 ◽  
pp. 85-91 ◽  
Author(s):  
A.P.T. Rocha ◽  
H.M. Lisboa ◽  
O.L.S. Alsina ◽  
O.S. Silva
Keyword(s):  
Coating Process ◽  
Spouted Bed ◽  
Phyllanthus Niruri

Economics of coated paper production made from deinked pulp

TAPPI Journal ◽  
2013 ◽  
Vol 12 (4) ◽  
pp. 19-27
Author(s):  
PATRICK HUBER ◽  
LAURENT LYANNAZ ◽  
BRUNO CARRÉ
Keyword(s):  
Mechanical Properties ◽  
Optimization Methods ◽  
Coating Process ◽  
Coated Paper ◽  
Paper Production ◽  
Base Paper

The fraction of deinked pulp for coated paper production is continually increasing, with some mills using 100% deinked pulp for the base paper. The brightness of the coated paper made from deinked pulp may be reached through a combination of more or less extensive deinking, compensated by appropriate coating, to optimize costs overall. The authors proposed general optimization methods combined with Kubelka-Munk multilayer calculations to find the most economical combination of deinking and coating process that would produce a coated paper made from DIP, at a given target brightness, while maintaining mechanical properties.

Depletion of coating color components in the blade coating process circulation

TAPPI Journal ◽  
2011 ◽  
Vol 10 (9) ◽  
pp. 17-23 ◽  
Author(s):  
ANNE RUTANEN ◽  
MARTTI TOIVAKKA
Keyword(s):  
Fine Particles ◽  
Particle Density ◽  
Stable Process ◽  
Size Fraction ◽  
Color Stability ◽  
Strong Interactions ◽  
Coating Process ◽  
Size Segregation ◽  
Coating Color ◽  
Average Size

Coating color stability, as defined by changes in its solid particle fraction, is important for runnability, quality, and costs of a paper coating operation. This study sought to determine whether the size or density of particles is important in size segregation in a pigment coating process. We used a laboratory coater to study changes in coating color composition during coating operations. The results suggest that size segregation occurs for high and low density particles. Regardless of the particle density, the fine particle size fraction (<0.2 μm) was the most prone for depletion, causing an increase in the average size of the particles. Strong interactions between the fine particles and other components also were associated with a low depletion tendency of fine particles. A stable process and improved efficiency of fine particles and binders can be achieved by controlling the depletion of fine particles.

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