Microwave processing: fundamentals and applications

Thostenson, Erik T.; Chou, Tsu-Wei

doi:10.1016/s1359-835x(99)00020-2

Cited by 1,247 publications

(669 citation statements)

References 26 publications

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“…Interaction between the material and the microwave energy generates heat. The ability to convert microwave energy into thermal energy depends on the magnitude of the dielectric loss of the material [6,7] . Therefore, in mixtures of materials, it is possible a selective heating of specific regions, a property that has been exploited in the processing of thermosets with mineral fillers [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Blends of ground tire rubber devulcanized by microwaves/HDPE - Part A: influence of devulcanization process

et al. 2015

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SbstractThe main objective of this work is the study of the influence of microwaves devulcanization of the elastomeric phase on dynamically revulcanized blends based on Ground Tire Rubber (GTR)/High Density Polyethylene (HDPE). The devulcanization of the GTR was performed in a system comprised of a conventional microwave oven adapted with a motorized stirring at a constant microwaves power and at various exposure times. The influence of the devulcanization process on the final properties of the blends was evaluated in terms of mechanical, viscoelastic, thermal and rheological properties. The morphology was also studied.

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Section: Introductionmentioning

confidence: 99%

Blends of ground tire rubber devulcanized by microwaves/HDPE - Part A: influence of devulcanization process

et al. 2015

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“…Volumetric heating can also reduce processing times and save energy. The microwave field and the dielectric response of a material govern its ability to heat with microwave energy (Thostenson and Chou, 1999).…”

Section: Introductionmentioning

confidence: 99%

Enhancing solubilisation and methane production kinetic of switchgrass by microwave pretreatment

Jackowiak

Frigon

Ribeiro

et al. 2011

Bioresource Technology

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This study investigated the effects of microwave pretreatment of switchgrass in order to enhance its anaerobic digestibility. Response surface analysis was applied to screen the effects of temperature and time of microwave pretreatment on matter solubilisation. The composite design showed that only temperature had a significant effect on solubilisation level. Then the effects of the microwave pretreatment were correlated to the pretreatment temperature. The sCOD/tCOD ratio was equal to 9.4% at 90°C and increased until 13.8% at 180°C. The BMP assays of 42 days showed that microwave pretreatment induced no change on the ultimate volume of methane but had an interesting effect on the reaction kinetic. Indeed, the time required to reach 80% of ultimate volume CH 4 is reduced by 4.5 days at 150°C using the microwave pretreatment.

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“…The relationship between the coal dielectric properties and microwave energy absorbed may be derived from Maxwell's equations (Thostenson and Chou 1999;Clark et al 2000):…”

Section: Thermal Effectmentioning

confidence: 99%

Progress of the technique of coal microwave desulfurization

Tao

Xie

et al. 2014

Int J Coal Sci Technol

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With the advantages of its fast speed, effective and moderate controllable conditions, desulfurization of coal by microwave has become research focus in the field of clean coal technology. Coal is a homogeneous mixture which consists of various components with different dielectric properties, so their abilities to absorb microwaves are different, and the sulfur-containing components are better absorbers of microwave, which makes them can be selectively heated and reacted under microwave irradiation. There still remain controversies on the principle of microwave desulfurization at present, thermal effects or non-thermal effects. The point of thermal effects of microwave is mainly base on its characters of rapidly and selectly heating. While, in view of non-thermal effect, direct interactions between the microwave electromagnetic field and sulfur containing components are proposed. It is a fundamental problem to determine the dielectric properties of coal and the sulfur-containing components to reveal the interaction of microwave and sulfur-containing compounds. However, the test of dielectric property of coal is affected by many factors, which makes it difficult to measure dielectric properties accurately. In order to achieve better desulfurization effect, the researchers employ methods of adding chemical additives such as acid, alkali, oxidant, reductant, or changing the reaction atmosphere, or combining with other methods such as magnetic separation, ultrasonic and microorganism. Researchers in this field have also put forward several processes, and have obtained a number of patents. Obscurity of microwave desulfurization mechanism, uncertainties in qualitative and quantitative analysis of sulfur-containing functional groups in coal, and the lack of special microwave equipment have limited further development of microwave desulfurization technology.

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Microwave processing: fundamentals and applications

Cited by 1,247 publications

References 26 publications

Blends of ground tire rubber devulcanized by microwaves/HDPE - Part A: influence of devulcanization process

Blends of ground tire rubber devulcanized by microwaves/HDPE - Part A: influence of devulcanization process

Enhancing solubilisation and methane production kinetic of switchgrass by microwave pretreatment

Progress of the technique of coal microwave desulfurization

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