Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed
Spray drying of suspensions leads most often to free-flowing powder products of good quality. However, this process is energy-consuming, especially because of the high amounts of liquid to be evaporated from the sprayed suspension. Indeed, in...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Hosokawa Powder Technology Foundation
2014-03-01
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| Series: | KONA Powder and Particle Journal |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/kona/26/0/26_2008019/_pdf/-char/en |
| _version_ | 1818617357677887488 |
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| author | Anne Dusanter Khashayar Saleh Pierre Guigon |
| author_facet | Anne Dusanter Khashayar Saleh Pierre Guigon |
| author_sort | Anne Dusanter |
| collection | DOAJ |
| description | Spray drying of suspensions leads most often to free-flowing powder products of good quality. However, this process is energy-consuming, especially because of the high amounts of liquid to be evaporated from the sprayed suspension. Indeed, in order to ensure a good quality and stability of spraying, the amount of solvent must be determined so as to avoid excessive suspension viscosities. For a given amount of solvent, it is also possible to improve the viscosity of concentrated suspensions by deflocculation using appropriate dispersants.Through the use of an adequate dispersant, we showed that it is possible to obtain fully dispersed suspensions and to optimize their dryness in order to reduce the moisture content to be evaporated. The effect of different salts and the molecular weight of polyacrylic acid is investigated to improve the formulation of concentrated calcite suspensions with the focus on spray drying.A new continuous process, developed to enable the drying of highly concentrated slurries at low temperature, is also described. This process is based on the coupling of coating/attrition of a suspension in a fluidized bed of inert particles, and it strongly increases the surface area available for heat and mass transfers.Further analysis of this process has been carried out addressing the drying kinetics in a drying pipe. It shows a strong influence of the support wettability as well as the surface tension of suspension on the drying kinetics of suspension films. The surface tension of the suspension and humidity were found to be crucial parameters to optimize the powder recovery. |
| first_indexed | 2024-12-16T17:04:25Z |
| format | Article |
| id | doaj.art-56708765e7bd4718b788102e5e8ad827 |
| institution | Directory Open Access Journal |
| issn | 0288-4534 2187-5537 |
| language | English |
| last_indexed | 2024-12-16T17:04:25Z |
| publishDate | 2014-03-01 |
| publisher | Hosokawa Powder Technology Foundation |
| record_format | Article |
| series | KONA Powder and Particle Journal |
| spelling | doaj.art-56708765e7bd4718b788102e5e8ad8272022-12-21T22:23:37ZengHosokawa Powder Technology FoundationKONA Powder and Particle Journal0288-45342187-55372014-03-0126021522610.14356/kona.2008019konaFormulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized BedAnne Dusanter0Khashayar Saleh1Pierre Guigon2UMR 6067, Laboratoire Technologie des Poudres et Suspensions, Département Génie des Procédés Industriels, Université de Technologie de Compiègne, Centre de Recherches de RoyallieuUMR 6067, Laboratoire Technologie des Poudres et Suspensions, Département Génie des Procédés Industriels, Université de Technologie de Compiègne, Centre de Recherches de RoyallieuUMR 6067, Laboratoire Technologie des Poudres et Suspensions, Département Génie des Procédés Industriels, Université de Technologie de Compiègne, Centre de Recherches de RoyallieuSpray drying of suspensions leads most often to free-flowing powder products of good quality. However, this process is energy-consuming, especially because of the high amounts of liquid to be evaporated from the sprayed suspension. Indeed, in order to ensure a good quality and stability of spraying, the amount of solvent must be determined so as to avoid excessive suspension viscosities. For a given amount of solvent, it is also possible to improve the viscosity of concentrated suspensions by deflocculation using appropriate dispersants.Through the use of an adequate dispersant, we showed that it is possible to obtain fully dispersed suspensions and to optimize their dryness in order to reduce the moisture content to be evaporated. The effect of different salts and the molecular weight of polyacrylic acid is investigated to improve the formulation of concentrated calcite suspensions with the focus on spray drying.A new continuous process, developed to enable the drying of highly concentrated slurries at low temperature, is also described. This process is based on the coupling of coating/attrition of a suspension in a fluidized bed of inert particles, and it strongly increases the surface area available for heat and mass transfers.Further analysis of this process has been carried out addressing the drying kinetics in a drying pipe. It shows a strong influence of the support wettability as well as the surface tension of suspension on the drying kinetics of suspension films. The surface tension of the suspension and humidity were found to be crucial parameters to optimize the powder recovery.https://www.jstage.jst.go.jp/article/kona/26/0/26_2008019/_pdf/-char/enspray dryinginert particlessuspensiondrying kineticsattrition |
| spellingShingle | Anne Dusanter Khashayar Saleh Pierre Guigon Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed KONA Powder and Particle Journal spray drying inert particles suspension drying kinetics attrition |
| title | Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed |
| title_full | Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed |
| title_fullStr | Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed |
| title_full_unstemmed | Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed |
| title_short | Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed |
| title_sort | formulation of highly concentrated suspensions for spray drying in a fluidized bed |
| topic | spray drying inert particles suspension drying kinetics attrition |
| url | https://www.jstage.jst.go.jp/article/kona/26/0/26_2008019/_pdf/-char/en |
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