Study of the microwave vacuum drying process for a granulated product

Berteli, Michele Nehemy; Rodier, Élisabeth; Marsaioli, Antonio

doi:10.1590/s0104-66322009000200009

Cited by 17 publications

(9 citation statements)

References 12 publications

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“…A more recent work randomly selected, was oriented to investigate dry milling of previously dried grains in a domestic microwave oven [6]. Other work reports the study of a microwave vacuum drying system of granulated material [7], and another one analyzes the temperature variations in barley and canola grains with different moisture contents [8]. This last work details the influence of such grain in temperature uniformity when using microwave-based heating.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of drying coffee beans using microwave and conventional oven

Muñoz-Neira

Roa-Ardila

Correa-Celi

2019

redin

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This article reports a comparative study of experimental results obtained during the drying of Castilla-variety coffee beans from Santander, Colombia. They were performed by two means: thermal and electromagnetic radiation. Twenty experiments were carried out, ten tests in a microwave cavity at 2,450 MHz-1,080W, and ten tests using a conventional electric oven with temperature controlled at 50±2oC. Experiments were made using samples of coffee beans with parchment, without parchment, and of the only-parchment. For each sample, dimensionless moisture ratio and diffusion coefficients were determined, according to the second law of Fick. We found that the diffusion coefficient of the samples dried in a microwave cavity was twenty-two times higher than the diffusion coefficient of samples dried with thermal radiation. Likewise, it was observed that samples in conventional oven showed a uniform temperature, in contrast with those heated by microwave radiation. Such results are useful for designing hybrid systems for drying coffee beans.

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Section: Introductionmentioning

confidence: 99%

Comparative analysis of drying coffee beans using microwave and conventional oven

Muñoz-Neira

Roa-Ardila

Correa-Celi

2019

redin

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“…Both mediums of the simulated gastric and intestinal buffer solutions were prepared according to the specications in the International European Pharmacopeia EP, 5th Ed., which are shown in Table 2. 18,19 The gastric uid medium was prepared by dissolving 2 g of sodium chloride in 800 mL of deionized water, and its pH was adjusted to 1.3 using hydrochloric acid. The solution was then diluted with water to obtain 1000 mL of the buffer solution.…”

Section: Methodsmentioning

confidence: 99%

“…The solution was then diluted with water to obtain 1000 mL of the buffer solution. 18,19 Similarly, the intestinal medium was prepared by dissolving about 6.9 g of sodium dihydrogen phosphate and 0.9 g of sodium hydroxide in 800 mL of deionized water. Consequently, the pH of the solution was adjusted to 6.8 using sodium hydroxide.…”

Section: Methodsmentioning

confidence: 99%

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Influences of novel microwave drying on dissolution of new formulated naproxen sodium

2018

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“…Also, increasing vapor pressure in pores of the adsorbent promotes the acceleration of the desorption process [11].…”

Section: Introductionmentioning

confidence: 99%

Diagnostics of Uneven Heating of the Adsorbent by Microwave Radiation and Measures to Increase the Uniformity of Its Heating

Dobrotvorskiy¹,

Dobrovolska²,

Basova³

et al. 2019

Period. Polytech. Chem. Eng.

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In Europe, 3 % of the electricity consumed by industry is spent on the production of compressed air. At the same time, the payment for electricity consumed by the compressor is the largest share in the structure of the factorys costs. In modern production, compressed air requires drying to meet the requirements of the equipment and for various technological processes. In this case, a large amount of compressed air is lost thus, improving the design of air dryers is an important step for improving energy efficiency. In this paper is developing a method for reducing the energy costs of the heated desiccant dryers is developed by mean of regenerating adsorbents using microwave energy.In the process of developing heaters using microwave energy, the main problem is the achievement of a uniform heating of the material. The same problem also arises when using microwave energy to regenerate the adsorbent in the adsorption dryer. Due of above-mentioned, the problem by dynamically changing the configuration of the heater chamber and waveguide systems is solved by using of increasing the uniformity of heating and two opposite waveguides in the heater design with a variable phase of one of them. A specific condition for conducting experiments is obtained. Particularly the adsorption dryer chamber is a cylindrical vessel that is filled with an adsorbent and has predetermined proportions. A significant change of these proportions adversely affect at the adsorption process during the operation of the desiccant.

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Study of the microwave vacuum drying process for a granulated product

Cited by 17 publications

References 12 publications

Comparative analysis of drying coffee beans using microwave and conventional oven

Comparative analysis of drying coffee beans using microwave and conventional oven

Influences of novel microwave drying on dissolution of new formulated naproxen sodium

Diagnostics of Uneven Heating of the Adsorbent by Microwave Radiation and Measures to Increase the Uniformity of Its Heating

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