Spray drying: Thermodynamics and Operating Conditions

Normand, Valéry; Subramaniam, Anandaraman; Donnelly, Jeffrey P.; Bouquerand, Pierre-Etienne

doi:10.1016/j.carbpol.2013.04.096

Cited by 10 publications

(2 citation statements)

References 23 publications

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“…Insufficient inlet air temperature may cause an incomplete droplet drying, producing sticky particles requiring a long drying residence time and/or leading to a coating of the dryer wall and to caking. 54 The increase in air temperature showed a positive effect on powder moisture content, powder recovery percentage, and dryer thermal efficiency, as observed in Table 4.…”

Section: Effect Of Drying Air Temperature On Spray-dried Starchmentioning

confidence: 79%

Impact of operating conditions on a single droplet and spray drying of hydroxypropylated pea starch: Process performance and final powder properties

Gouaou

Shamaei

Koutchoukali

et al. 2018

Asia-Pacific J Chem Eng

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For an efficient production of spray‐dried fine powders having controllable properties (size, size distribution, and morphology), finding suitable operating conditions and an appropriate initial composition of the fluid material is important. For this purpose, a suspension device is employed to investigate the drying kinetics of a single droplet of hydroxypropylated pea starch (HPS). In the current work, the effect of the drying air temperature (80–160°C) and of the initial solid content of the agent (15–30%w/w) on the drying kinetics, shrinkage, and locking point of a single droplet was systematically investigated to acquire the optimal conditions required for producing HPS powder using a pilot‐scale spray dryer. In addition to the previously mentioned parameters, the atomization pressure effect (2–3 bars) on the spray‐drying process yield, thermal efficiency, and final powder properties were also considered. A laboratory‐scale X‐ray microtomograph and a camsizer‐XT were employed for the acquisition of three‐dimensional images and surface morphology of single dried particles and spray‐dried powder, respectively. Hollow particles were obtained in all single droplet experiments. The drying kinetic study results were supported by those obtained by the spray drying of HPS. An increased temperature of the drying air and the initial solid content of the solution results in higher powder recovery, lower residual moisture content, and larger particle size. Otherwise, the final particles are larger at a decreased atomization pressure. The optimized parameters for the high spray‐drying process yield (24.54%; 3 bars, 140°C, 25 wt%) and better powder homogeneity (span = 2.31; 3 bars, 140°C, 20 wt%) were defined. A mixture of particle morphologies was observed among the different final powders. A broken shell corresponding to rigid particles was obtained at a drying temperature of 140°C and an initial solid content of 25 wt%. A nonbroken particle refers to a pliable particle that corresponds to inflated and collapsed particles dried at high and low drying temperatures.

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Section: Effect Of Drying Air Temperature On Spray-dried Starchmentioning

confidence: 79%

Impact of operating conditions on a single droplet and spray drying of hydroxypropylated pea starch: Process performance and final powder properties

Gouaou

Shamaei

Koutchoukali

et al. 2018

Asia-Pacific J Chem Eng

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“…The transformation of liquid active ingredients into solid, powdered materials is important in many industrial areas such as flavor and fragrance delivery, consumer and cosmetic products, food technology, pharmaceutical formulation, and agrochemical deployment. − Traditionally, sensitive volatile oils including flavors and fragrances molecules or vitamins are turned into powders by processes such as spray-drying, ,, wherein emulsions of oil droplets dispersed in a concentrated polymer solution are dried in a hot gas stream to form free-flowing powders. In contrast to these thermally driven encapsulation processes, liquid/powder blending is an alternative technology with a much lower energy input and no heating requirements.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Delivery Systems: Retention of Model Volatile Oils Trapped on Hybrid Calcium Carbonate Microparticles

Elabbadi

Jerri

Ouali

et al. 2015

ACS Sustainable Chem. Eng.

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Transforming liquid active ingredients into solid, powdered materials is important for flavor and fragrance delivery, consumer, food, and beverage product technology, and pharmaceutical formulation. Liquid/powder blending is a sustainable technology to form liquid-loaded powders with a much lower energy input and no heating requirements as compared to heat-driven processes, such as spray-drying. The performance of wetted particles or agglomerates as delivery systems is limited because they typically remain open, without any protective barriers against loss of the liquid adsorbed on the surface and/or absorbed in the pores of the particles. Here, we investigate hybrid CaCO3 microparticles precipitated in the presence of different amphiphilic additives and evaluate their capacity to trap and retain limonene, a model volatile oil, by adsorption on the particle surface. We show using a micrometer-scale analysis of localized wetting that a combination of surface area and chemical affinity of the carrier particle for the liquid is critical to control volatile losses. The specific surface area of the solid carrier particles alone is not a key parameter for good retention of volatiles in the liquid-loaded powders. Additionally, we investigate the role of highly hydrophobic, nonvolatile solvents on volatile evaporation. This study demonstrates a sustainable processing approach to form delivery systems for volatile active ingredients.

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Schultz

2021

Food Hydrocolloids

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Spray drying: Thermodynamics and Operating Conditions

Cited by 10 publications

References 23 publications

Impact of operating conditions on a single droplet and spray drying of hydroxypropylated pea starch: Process performance and final powder properties

Impact of operating conditions on a single droplet and spray drying of hydroxypropylated pea starch: Process performance and final powder properties

Sustainable Delivery Systems: Retention of Model Volatile Oils Trapped on Hybrid Calcium Carbonate Microparticles

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