Production of MgAl/layered double hydroxide microspheres and investigation of the volumetric heat transfer coefficient in spray drying.

Autor: Silva Neto LD; Drying Center of Pastes, Suspensions, and Seeds, Department of Chemical Engineering, Federal University of São Carlos (UFSCar), São Carlos, São Paulo, 13565-905, Brazil., Meili L; Laboratory of Processes, Center of Technology, Federal University of Alagoas, Av. Lourival Melo Mota, s/n, Campus A.C. Simões, Tabuleiro do Martins, Maceió, AL, 57072-970, Brazil., Freire JT; Drying Center of Pastes, Suspensions, and Seeds, Department of Chemical Engineering, Federal University of São Carlos (UFSCar), São Carlos, São Paulo, 13565-905, Brazil.
Jazyk: angličtina
Zdroj: Heliyon [Heliyon] 2024 Apr 13; Vol. 10 (8), pp. e29646. Date of Electronic Publication: 2024 Apr 13 (Print Publication: 2024).
DOI: 10.1016/j.heliyon.2024.e29646
Abstrakt: Layered Double Hydroxides (LDH) are synthetic materials nanostructured in two dimensions that present positively charged layers with interspersed anions for charge and structure balancing. Being recognized as a promising material for various applications, a complete exploration of its possible attractive properties and its synthesis process is essential. However, drying, a necessary step in the process, is still little studied. This work aimed to produce MgAl-CO 3 /LDH microspheres and calculate the volumetric heat coefficient in spray drying, evaluating the drying air inlet temperature and the concentration of the feed paste in the dryer. LDH synthesis was carried out using the coprecipitation method, maintaining a 2:1 Mg/Al ratio. The infrared spectra presented the bands characteristic of the hydrotalcite-type material. Through XRD, it was possible to observe that the variation in drying air temperature and feed paste concentration produced LDHs with structural differences. The results obtained for the basal spacing ranged from 7.685 to 7.705 Å. Scanning electron microscopy images confirm the production of LDH microspheres, showing variation in the size of the agglomerates with changes in the feed paste concentration. The volumetric heat transfer coefficient values ranged from 4.31 to 5.36 W m -3  K -1 , with only the air inlet temperature significantly influencing the process under the conditions studied.
Competing Interests: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:I am an associated editor of Heliyon – Chemical Engineering section.
(© 2024 The Authors.)
Databáze: MEDLINE
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