RESS process in coating applications in a high pressure fluidized bed environment: Bottom and top spray experiments

Rodríguez‐Rojo, Soraya; Marienfeld, J; Cocero, Marı́a José

doi:10.1016/j.cej.2008.07.054

Cited by 18 publications

(4 citation statements)

References 25 publications

(41 reference statements)

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“…Complete coating films with no agglomeration in the top spray experiments were obtained. 32 Apart from process modifications, several different applications of RESS from encapsulation to deagglomeration and controlled particle deposition were recently reported. Fine microcapsulated red phosphorus particles were fabricated with a new nozzle design, 33 polyacrylonitrile nanofibers were produced, 34 the deagglomeration of the tightly agglomerated multiwalled carbon nanotubes was carried out, 35 porous tablets were loaded with ibuprofen to improve drug dissolution, 36 fine particles of antimalarial drug dihydroartemisinin were prepared, 37 and beclomethasone-17,21-dipropionate, an anti-inflammatory inhaled corticosteroid commonly used to treat asthma, was micronized 38 using the rapid expansion of supercritical solution technique.…”

Section: Resultsmentioning

confidence: 99%

“…Fluidized bed combined with the RESS process was proposed and as a model system glass beads particles were encapsulated with paraffin. Complete coating films with no agglomeration in the top spray experiments were obtained . Apart from process modifications, several different applications of RESS from encapsulation to deagglomeration and controlled particle deposition were recently reported.…”

Section: Resultsmentioning

confidence: 99%

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The Breadth and Intensity of Supercritical Particle Formation Research with an Emphasis on Publication and Patent Disclosures

Yeşil-Çeliktaş

Senyay

2010

Ind. Eng. Chem. Res.

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The drawbacks of the conventional mechanical treatments for particle micronization often resulting in product damage or performance degradation have highlighted the need for alternative particle formation processes. The aim of this study was to shed light on the trends of the scientific studies and innovations in the field of particle formation using supercritical fluids (SCF) in order to observe the progress of science and technology and to satisfy the need for a global view of research activities. The publications in the ISI Web and the patents in a patent database were screened using nine different keywords in title or topics. A total of 939 journal publication and 206 patent disclosures between 1980-2009, with the contributions of 3588 authors and 604 innovators, were found to focus on particle formation using SCF. The results showed that the majority of the publication (59.2%) and patent (40.3%) disclosures were related to antisolvent precipitation and rapid expansion of SCF (18.3,16%). Patents originating from United States (56.8%) were dominating, followed by those from the European Union (30.1%) and Japan (9.2%). The analysis revealed the appetite of the companies for commercialization (73.8%), which can be interpreted as an indicator of upcoming industrial applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The Breadth and Intensity of Supercritical Particle Formation Research with an Emphasis on Publication and Patent Disclosures

Yeşil-Çeliktaş

Senyay

2010

Ind. Eng. Chem. Res.

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“…Previous works on mm-scale and cm-scale fluidized beds, called micro fluidized beds (MFBs [1,3]), showed that MFBs can be successfully employed for mechanical and chemical processes. For example, they have been used for particle encapsulation [4,5], pyrolysis [6][7][8][9], catalytic cracking [10,11], gasification [12][13][14], capture of CO 2 [15,16], bioproduction [17][18][19],…”

Section: Introductionmentioning

confidence: 99%

Miniaturized gas–solid fluidized beds

Cúñez

Franklin

2023

Mechanics Research Communications

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“…C. Vogt et al (2004) [12] achieved smooth and complete covers over different types of solids, but only with yields near 50%. In 2008, S. Rodríguez-Rojo et al [13], tested two different ways of injecting a paraffin coating solution in the SC-CO2, bottom and top spray. The results showed the microparticles glass beads were totally covered and no aggregation was achieved when the solution is feed through the top spray.…”

Section: Introductionmentioning

confidence: 99%

Titanium dioxide nanoparticle coating in fluidized bed via supercritical anti-solvent process (SAS)

Martín

Romero-Díez

Rodríguez‐Rojo

et al. 2015

Chemical Engineering Journal

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A process to coat nanoparticle agglomerates has been developed and its critical operation parameters have been studied in this work. It consists on a fluidized bed where a supercritical anti-solvent process (SAS) takes place. Titanium dioxide (TiO2), used as model nanoparticle, has been coated with a polymer, Pluronic F-127, from an ethanolic solution. As main factors that can affect the coating process, the following process parameters were studied: the ratio between the velocity of carbon dioxide through the bed and the minimum fluidization velocity (umf), with values from 1.5 to 2.5 times the umf; the density of carbon dioxide, varying from 640 kg/m 3 to 735 kg/m 3 approximately; the flow rate of solution, within an interval between 0.5-2 mL/min; the concentration of the solution, from 0.030 mg/mL to 0.090 mg/mL and the mass ratio polymer-particle, 0.45-1.8 g/g. The process parameters were selected taking into account the values that increased the yield, defined as gram of coating material per gram of introduced polymer amount, and maintained a unimodal particle size distribution (PSD), with low increment in the mean particle size with respect to raw TiO2. All the samples were analyzed by four different methods, which showed the successful results of the experiments. The yield was analyzed gravimetrically, and the PSD was determined by laser diffraction. The presence of polymer on the surface of the nanoparticle agglomerates was verified by FT-IR spectrum and fluorescence microscopy, which also showed the quality and uniformity of the coating. Furthermore, the bulk density of the samples was measured showing a lineal variation with the mass ratio polymer-particle.3

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RESS process in coating applications in a high pressure fluidized bed environment: Bottom and top spray experiments

Cited by 18 publications

References 25 publications

The Breadth and Intensity of Supercritical Particle Formation Research with an Emphasis on Publication and Patent Disclosures

The Breadth and Intensity of Supercritical Particle Formation Research with an Emphasis on Publication and Patent Disclosures

Miniaturized gas–solid fluidized beds

Titanium dioxide nanoparticle coating in fluidized bed via supercritical anti-solvent process (SAS)

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