The drying of solids in a modified fluidized bed

Ambrosio, M.; Taranto, Osvaldir Pereira

doi:10.1590/s0104-66322002000300010

Cited by 12 publications

(3 citation statements)

References 2 publications

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“…Because of the large solid-gas contact surface and the mixing degree, the mass transfer rates are favoured by using fluidized bed dryers (Touil 2017). The main parameters to be considered by this technology are the gas temperature, pressure, flow and particle size (Ambrosio and Taranto 2002;Touil 2017).…”

Section: Dryingmentioning

confidence: 99%

From the culture broth to the erythritol crystals: an opportunity for circular economy

Daza-Serna

Serna-Loaiza

Masi

et al. 2021

Appl Microbiol Biotechnol

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The reduction of sugar intake by adults has been stated by the World Health Organization as an important strategy to reduce the risk of non-communicable diseases. Erythritol is a four-carbon sugar alcohol that is considered as a highly suitable substitution for sucrose. This review article covers approaches for the separate stages of the biotechnological production of erythritol from cultivation to the downstream section. The first part focuses on the cultivation stage and compares the yields of erythritol and arising by-products achieved with different types of substrates (commercial versus alternative ones). The reported numbers obtained with the most prominently used microorganisms in different cultivation methods (batch, fed-batch or continuous) are presented. The second part focuses on the downstream section and covers the applied technologies for cell removal, recovery, purification and concentration of erythritol crystals, namely centrifugation, membrane separation, ion and preparative chromatography, crystallization and drying. The final composition of the culture broth and the preparative chromatography separation performance were identified as critical points in the production of a high-purity erythritol fraction with a minimum amount of losses. During the review, the challenges for a biotechnological production of erythritol in a circular economy context are discussed, in particular regarding the usage of sustainable resources and minimizing waste streams. Key points • Substitution of sucrose by erythritol can be a step towards a healthier society • Biotechnological production of erythritol should follow a circular economy concept • Culture broth composition and preparative chromatography are keys for downstreaming • Substrate, mother liquor and nutrients are challenges for circular economy

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Section: Dryingmentioning

confidence: 99%

From the culture broth to the erythritol crystals: an opportunity for circular economy

Daza-Serna

Serna-Loaiza

Masi

et al. 2021

Appl Microbiol Biotechnol

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“…The granule will also exhibit channelling when fluidized [1]. To improve the fluidity of cohesive powders, researchers have proposed several techniques including mechanical vibration [2][3][4][5]7], bed stirring [4,6,7] and gas pulsation [8,9]. However, the pharmaceutical industry does not employ any of these assisting techniques to aid their granule fluidity during drying.…”

Section: Introductionmentioning

confidence: 99%

The influence of vessel geometry on fluidized bed dryer hydrodynamics

Wormsbecker¹,

Ommen²,

Nijenhuis³

et al. 2009

Powder Technology

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“…[3] In one, gas pulsation is generated by a butterfly valve, which is installed in the gas inlet duct and rotated at a specific angular velocity, while the others are based on relocation of the gas stream to the bottom of the bed. Relocation of the gas stream can be achieved by: (1) the use of a rotating distributor valve, which makes the gas stream sweep across specified chambers of a rectangular bed; [10,12,13] (2) the use of a perforated rotating disc located below the circular bed; [14][15][16] and (3) the use of a rotating slotted horizontal cylinder that directs the gas stream to different sections of the base of a circular bed. [17] The objectives of the present investigation were to study the fluid dynamics in beds of potato slices and the evaluation through statistical design of the effect of air velocity, air temperature, and rotating disk velocity that give the bed the pulsed effect during drying.…”

Section: Introductionmentioning

confidence: 99%

Drying of Potato Slices in a Pulsed Fluidized Bed

2007

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This article presents experimental and modeled drying kinetics of potato slices of the Desiree variety (9 3 9 3 3 mm 3 ) in a pulsed fluid bed as a function of the air velocity, air temperature, and rotating disk velocity of the pulse generator. A statistical multifactor experimental design (2 3 ) was applied to analyze the drying process with two levels each of drying temperature, air velocity, and rotating disk velocity. The results showed that the significant factors were air temperature, air velocity, rotating disk velocity, and the binary interactions of air velocity with both the temperature and the rotating disk velocity. The simplified variable diffusivity model (SVDM) gave the least deviation for the experimental data. The effective diffusivity values determined in this work are similar to those reported in the literature.

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The drying of solids in a modified fluidized bed

Cited by 12 publications

References 2 publications

From the culture broth to the erythritol crystals: an opportunity for circular economy

From the culture broth to the erythritol crystals: an opportunity for circular economy

The influence of vessel geometry on fluidized bed dryer hydrodynamics

Drying of Potato Slices in a Pulsed Fluidized Bed

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