Study on Destroying Enzyme in Chestnuts (Castanea mollissima Blume) by Microwave Heating

2014 ◽  
Vol 852 ◽  
pp. 262-265
Author(s):  
Chao Nan Wang ◽  
Xin Xin Yi ◽  
Jing Hua Qi ◽  
Fang Wang ◽  
Mei Xia Pang
Keyword(s):  
Enzyme Activity ◽  
Microwave Heating ◽  
Microwave Power ◽  
Colorimetric Method ◽  
Microwave Treatment ◽  
Microwave Technology ◽  
Castanea Mollissima ◽  
Microwave Time

Using microwave technology,establish a best destroying enzyme condition that can make peroxidase (POD) and polyphenoloxidase (PPO) lossing of activity. Enzyme activity of PPO and POD were determined by guaiacol colorimetric method and catechol colorimetric method under the condition of six different microwave time and five different microwave power. Complete deactivation of POD and PPO was achieved when microwave treatment of the chestnut kernel to 640W/60s were combined. Under these conditions, the color and flavor of the product were retained,which is the best destroying enzyme condition in chestnuts by microwave heating

scholarly journals Energy and Resource Utilization of Refining Industry Oil Sludge by Microwave Treatment

2020 ◽  
Vol 12 (17) ◽  
pp. 6862
Author(s):  
Chien Li Lee ◽  
Cheng-Hsien Tsai ◽  
Chih-Ju G. Jou
Keyword(s):  
Crude Oil ◽  
Microwave Power ◽  
Petroleum Refining ◽  
Microwave Treatment ◽  
Field Energy ◽  
Oily Sludge ◽  
Sludge Sample ◽  
Volatile Hydrocarbons ◽  
Benzene Toluene ◽  
Oil Tank

The oily sludge from crude oil contains hazardous BTEX (benzene, toluene, ethylbenzene, xylene) found in the bottom sediment of the crude oil tank in the petroleum refining plant. This study uses microwave treatment of the oily sludge to remove BTEX by utilizing the heat energy generated by the microwave. The results show that when the oily sludge sample was treated for 60 s under microwave power from 200 to 300 W, the electric field energy absorbed by the sample increased from 0.17 to 0.31 V/m and the temperature at the center of the sludge sample increased from 66.5 °C to 96.5 °C. In addition, when the oily sludge was treated for 900 s under microwave power 300 W, the removal rates were 98.5% for benzene, 62.8% for toluene, 51.6% for ethylbenzene, and 29.9% for xylene. Meanwhile, the highest recovery rates of light volatile hydrocarbons in sludge reached 71.9% for C3, 71.3% for C4, 71.0% for C5, and 78.2% for C6.

Behavior of Microwave Heating of 316 Stainless Steel Green Body

2014 ◽  
Vol 936 ◽  
pp. 1694-1700
Author(s):  
Zhi Wei Li ◽  
Kai Yong Jiang ◽  
Fei Wang ◽  
Ji Liang Zhang
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Microwave Heating ◽  
Powder Particle ◽  
Microwave Power ◽  
Arc Discharge ◽  
Steel Powder ◽  
Powder Particle Size ◽  
Auxiliary Heating ◽  
316 Stainless Steel

This paper mainly introduces the mechanism of microwave heating: electric conduction loss, eddy current loss and arc discharge. The microwave heating behavior of 316 stainless steel powder body which made by gel casting was investigated in the paper. Experiments on different microwave power, powder particle size, and the content of auxiliary heating material showed that the smaller the powder particle size, the larger microwave power and auxiliary heating materials help 316 stainless steel body for sintering.

scholarly journals Recovery of Metals and Rare Earth Elements by Microwave heating Technology - A Review

2020 ◽  
Vol 7 (3) ◽  
pp. 196-206
Author(s):  
Shunda Lin ◽  
Mamdouh Omran ◽  
Shenghui Guo
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Microwave Heating ◽  
Industrial Applications ◽  
Metallurgical Waste ◽  
Microwave Technology ◽  
Valuable Metals ◽  
Rare Earth Minerals ◽  
Save Energy ◽  
Heating Technology

: Microwave heating technology is considered one of the most likely to replace traditional heating methods due to its efficient, quick, and green heating transmission that meets the requirements of sustainable development. Microwave heating can strengthen chemical reactions and change the morphology of minerals, and it can save energy and achieve rapid and efficient heating, clean production, and emission reduction. Therefore, this paper summarizes the research status of microwave heating in the recovery of valuable metals (Cu, Au, V),) from metallurgical waste ore and rare earth elements from rare earth minerals in recent years, expounds the principle of microwave heating, and summarizes the previous experimental phenomena. Finally, the development potential, opportunities, and difficulties of microwave technology in future industrial applications are discussed.

scholarly journals Optimization of Microwave Pre-Cooked Conditions for Gelatinization of Adzuki Bean

Foods ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 171
Author(s):  
Jianyou Zhang ◽  
Xuehua Xie ◽  
Lyu Zhang ◽  
Yiling Hong ◽  
Gaopeng Zhang ◽  
...  
Keyword(s):  
Starch Content ◽  
Polarized Light ◽  
Microwave Treatment ◽  
Adzuki Bean ◽  
X Ray Diffraction ◽  
Relative Crystallinity ◽  
Soaking Time ◽  
X Ray ◽  
Ft Ir ◽  
Microwave Time

Pre-cooked adzuki beans (Vigna angularis), which looks like dried adzuki bean, is easily cooked and preserved. This study aimed to optimize the microwave pre-cooked conditions on adzuki beans by applying the response surface methodology. The results showed that soaking time has a significant effect on the gelatinization degree of adzuki beans according to microwave time. The most suitable gelatinization and the sensory scores were obtained with a soaking time of 7.8 h, a microwave power of 830 W, and microwave time of 92 s. The pre-cooked treatment had no significant effect (p > 0.05) on the protein, free amino acid, fat and starch content of adzuki bean products. The results of SEM and polarized light microscopy showed that the surface and center of starch were damaged after microwave treatment. XRD showed that microwave pre-cooking did not change the crystal structure of starch and maintained the original order of type A structure while reducing the relative starch crystallinity. FT-IR showed that the pre-cooked treatment did not produce new structure in adzuki bean starch, but the ratio of 1047/1022 cm−1 was slightly decreased, indicating that the starch crystallization area decreased relative to the amorphous area and the relative crystallinity decreased. The results of FTIR were consistent with X-ray diffraction results. Therefore, microwaves improved the gelatinization of adzuki beans and made the pre-cooked adzuki beans more suitable.

Analysis of Products by Conventional and Microwave Induced Pyrolysis for Low Rank Coal

2012 ◽  
Vol 524-527 ◽  
pp. 871-875
Author(s):  
Yong Hui Song ◽  
Jun Wei Shi ◽  
Jian Ping Fu ◽  
Xin Zhe Lan ◽  
Qiu Li Zhang ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Microwave Power ◽  
Microwave Treatment ◽  
Light Fraction ◽  
Low Rank ◽  
Low Rank Coal ◽  
Microwave Pyrolysis ◽  
Microwave Assisted ◽  
Component Content ◽  
Conventional Pyrolysis

This paper describes the products characteristic derived from the conventional pyrolysis (CP) and microwave-assisted pyrolysis (MWP) of low metamorphic coal. GC/MS were used to analyze the volatile fractions of tar obtained by pyrolysis at different temperature and microwave power. It was found that microwave treatment produces more gas and oil than conventional pyrolysis at 800w and 800°C. In addition, the gas from the microwave has much higher syngas (H2+ CO) contents (up to 55 vol. %) than those obtained by conventional hydrolysis (up to 42 vol. %). The tar from the microwave is mainly composed of aromatic pyrolysis and phenolic compounds, and the content is 47.398% and 13.831% respectively as the microwave power is 800w. Meanwhile, the tar component content of C5-C10from microwave pyrolysis is up to 5 fold than conventional pyrolysis. By contrast, the microwave-assisted pyrolysis is beneficial to the tar conversion to light fraction.

scholarly journals The multiplicity of steady-state solutions arising from microwave heating. I. Infinite Biot number and small penetration depth

2001 ◽  
Vol 43 (1) ◽  
pp. 87-103 ◽  
Author(s):  
M. I. Nelson ◽  
G. C. Wake ◽  
X. D. Chen ◽  
E. Balakrishnan
Keyword(s):  
Steady State ◽  
Microwave Heating ◽  
Penetration Depth ◽  
Biot Number ◽  
Microwave Power ◽  
Phase Plane ◽  
Solid Materials ◽  
Temperature Function ◽  
Class A ◽  
Steady State Solutions

AbstractMicrowave heating of porous solid materials has received considerable attention in recent years because of its widespread use in industry. In this study, the microwave power absorption term is modelled as the product of an exponential temperature function with function that decays exponentially with distance. The latter describes the penetration of material by the microwaves.We investigate the phenomena of multiplicity in class A geometries, paying particular attention to how the penetration function affects the behaviour of the system. We explain why the phase-plane techniques which have been used in the case when the penetration term is constant do not extend to non-constant penetration.

Microwave Processing of Silicon Nitride

1990 ◽  
Vol 189 ◽  
Author(s):  
T. N. Tiegs ◽  
J. O. Kiggans ◽  
H. D. Kimrey
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Microwave Heating ◽  
Grain Growth ◽  
Microwave Power ◽  
Microwave Sintering ◽  
Microwave Processing ◽  
Microwave Furnace

ABSTRACTMicrowave sintering of Si3N4—based materials showed improved densification as compared to samples heated conventionally under similar conditions. Accelerated nitridation of Si in the microwave furnace to produce Si3N4 was also observed. Dense Si3N4, annealed by microwave heating, exhibited enhanced grain growth; however preferential coupling of the microwave power to the grain—boundary phases in the present experiments resulted in their degradation.

scholarly journals Microwave treatment of rice

2013 ◽  
Vol 19 (No. 2) ◽  
pp. 62-66 ◽  
Author(s):  
J. Kaasová ◽  
P. Kadlec ◽  
Z. Bubník ◽  
V. Pour
Keyword(s):  
Microwave Heating ◽  
Starch Content ◽  
Initial Moisture Content ◽  
Microwave Treatment ◽  
Drying Time ◽  
Treated Sample ◽  
System Temperature ◽  
Rice Drying ◽  
The Stability ◽  
Total Starch

The effect of microwave treatment on wet rice was studied. Power output used was 90, 160, 350 or 500 W; final heating temperatures were 40, 60 and 80°C; initial moisture content of rice was 11, 21 or 30%. Temperature of treated sample during microwave heating was measured by means of NoEMI fiber-optic temperature system. Temperature of rice gelatinization, expressed as alkali spreading values and total starch content, was used to evaluate the influence of microwave heating on physicochemical properties of rice. Drying time reduction and the stability of total starch content during microwave treatment of rice makes it possible to recommend the combination of microwave and conventional rice drying for further use.

The Study on Experiments of Oilfield Wastewater Treatment by Microwave-Assisted Demulsification

2012 ◽  
Vol 599 ◽  
pp. 516-520 ◽  
Author(s):  
Hong Mei Cui ◽  
Ling Fei Ke ◽  
Han Bing Qi ◽  
Li Yun Chen
Keyword(s):  
High Efficiency ◽  
Microwave Treatment ◽  
Bactericidal Effect ◽  
Oil Field ◽  
Oily Wastewater ◽  
Small Space ◽  
Microwave Technology ◽  
Microwave Assisted ◽  
Leading Role ◽  
Discharge Water

Oily wastewater from oil field by microwave induced and catalytic demulsification was studied in this paper. The advantages and prospects of the microwave technology was analyzed. Microwave treatment of oilfield wastewater has advantages such as equipment occupies a small space, easy to operate, portable, easy to transport, easy to installation and commissioning, short reaction time, high efficiency, discharge water which has good quality, temperature and other factors do not affect the treatment oilfield wastewater effect and so on. Microwave also has a bactericidal effect which was applicable to treat oilfield wastewater in both South and North of China. When the processing time is 2.5 min at temperature 57°C, microwave demulsification has the best effect. Based on the research of microwave demulsifucation mechanism, a conclusion is reached that microwave heating effect and microwave catalytic eddect play a leading role on the demulsification.

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