Study of the interaction between water and Gelidium sesquipedale (Rhodophyta). Part I: Thermodynamic aspect of the sorption equilibrium

Hnini, Moulay Chrif; Benchanâa, M.; Hammioui, M. El

doi:10.1016/j.jtice.2013.01.023

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…The analysis of all results provides information on the kinetics and mechanisms of the thermal drying and confirms the nature of water molecules previously defined (Hnini et al, 2013). The kinetic mechanism that regulates the drying process under microwave field is not unique (Figure 8, domains I and II).…”

Section: Discussion and Interpretation Of Resultssupporting

confidence: 80%

Drying of Gelidium sesquipedale (Rhodophyta) Under Microwave Irradiation: Study of Thermal and Kinetic Aspects of the Drying Process

Hnini¹,

Benchanâa²,

Hammioui³

2014

IJC

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Microwave technology is currently very interesting because it offers, in many industrial processes, a new alternative energy for drying and treatment of various materials. In this context, the drying of the Gelidium sesquipedale (Rhodophyta), which is a red algae, is carried out under microwave irradiation in the aim to optimize the energy consumption in the drying process and the quality of the extracted products. The drying process of Gelidium sesquipedale under microwave irradiation is carried out by studying the thermal and kinetic aspects of drying under different irradiation conditions. The experiments were performed on samples of different initial masses ranging from 2 to 30 g. The samples are irradiated in an experimental device combining a gravimetric balance and microwave assembly that may impose different power microwave ranging from 50 to 200 W.The analysis of the experimental curves of the drying process shows that the initial mass of the sample has little influence and the applied microwave power has a significant effect on the drying kinetics. The comparative study of the drying of Gelidium sesquipedale by conventional heating and under electromagnetic field shows that the controlling kinetic mechanism depends on the way in which the sample is dried. The action of the electromagnetic field allows faster heat transfer leading to the rapid evacuation of water molecules from the seaweed.

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Section: Discussion and Interpretation Of Resultssupporting

confidence: 80%

Drying of Gelidium sesquipedale (Rhodophyta) Under Microwave Irradiation: Study of Thermal and Kinetic Aspects of the Drying Process

Hnini¹,

Benchanâa²,

Hammioui³

2014

IJC

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“…In a previous studies (Hnini et al, 2013), we have presented the experimental results concerning the thermodynamic equilibrium of the sorption and desorption of water in red algae. The main aim was to understand the nature of the interaction between water molecules and the Gelidium sesquipedale.…”

Section: Introductionmentioning

confidence: 99%

“…The sorption and desorption isotherms were performed using the static gravimetric method at temperatures 30, 45, and 60 °C and showed a slight hysteresis. In this study, the thermodynamic aspects has allowed to understand that 20% of water molecules are strongly linked to potential adsorption sites inside the plant cells and 80% of water molecules constitutes dampening water (Hnini et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Study of the Interaction Between Water and Gelidium sesquipedale (Rhodophyta): Part II: Kinetic of the Drying Process

Hnini¹,

Benchanâa²,

Hammioui³

2014

IJC

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The study of drying of red alga (Gelidium sesquipedale, Rhodophyta), with initial sample masses varying from 1 to 10 g, was carried at different temperatures 30 -80 °C. The experimental drying curves show a slight effect of the initial mass. Two types of curves are obtained: those at temperatures below 50 °C are fitted into straight line according to an interfacial progression process in cylindrical symmetry. Those of high-temperature drying (50 < θ < 80 °C), are perfectly parabolic and show that the kinetic regime is controlled by the three-dimensional diffusion according to the Jander equation. The two types of water molecules identified were also highlighted during the drying kinetics process. The apparent activation energy of the strongly bounded water (20%) is about 36.25 kJ·mol -1 , and that of the wetting water is in the range of 47.68 kJ·mol -1 .

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Air drying modelling of Mastocarpus stellatus seaweed a source of hybrid carrageenan

et al. 2017

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Study of the interaction between water and Gelidium sesquipedale (Rhodophyta). Part I: Thermodynamic aspect of the sorption equilibrium

Cited by 8 publications

References 22 publications

Drying of Gelidium sesquipedale (Rhodophyta) Under Microwave Irradiation: Study of Thermal and Kinetic Aspects of the Drying Process

Drying of Gelidium sesquipedale (Rhodophyta) Under Microwave Irradiation: Study of Thermal and Kinetic Aspects of the Drying Process

Study of the Interaction Between Water and Gelidium sesquipedale (Rhodophyta): Part II: Kinetic of the Drying Process

Air drying modelling of Mastocarpus stellatus seaweed a source of hybrid carrageenan

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