scholarly journals Drying process: effects of temperature on the oil of different sunflower genotypes

2020 ◽  
Vol 38 (1) ◽  
pp. 93-98
Author(s):  
Gustavo Soares Wenneck ◽  
Reni Saath ◽  
Roberto Rezende ◽  
Juliana Parisotto Poletine ◽  
Danilo César Santi ◽  
...  
Keyword(s):  
Drying Process ◽  
Process Effects ◽  
Effects Of Temperature

Production of quicklime from Ashaka limestone through calcination process

2021 ◽  
Vol 1 (2) ◽  
pp. 041-048
Author(s):  
Benson Chinweuba Udeh
Keyword(s):  
Particle Size ◽  
Critical Value ◽  
Operating Conditions ◽  
Quadratic Model ◽  
Particle Sizes ◽  
Calcination Process ◽  
Process Effects ◽  
Effects Of Temperature ◽  
The Difference ◽  
The Relationship

This study is on the production of quicklime from Ashaka limestone through calcination process. Effects of temperature, particle size and time on quicklime yield were determined. The experiment was carried out at temperatures of 800, 900, 1000, 1100 and 1200 0C, particle sizes of 80mm, 90mm, 100mm, 300mm and 425mm and times of 0.5hr, 1hr, 2hrs, 3hrs and 4hrs. Analyses of the results showed that quicklime was successfully produced from Ashaka limestone through the calcination process. Quadratic model adequately described the relationship between quicklime yield and calcination factors of temperature, particle size and time. Recorded model F-value of 134.35 implies that the model is significant. The predicted R² of 0.9597 is in reasonable agreement with the adjusted R² of 0.9844; the difference is less than the critical value of 0.2. Optimum yield of 73.48% was obtained at optima operating conditions; temperature of 1000 0C, particle size of 90 µm and time of 3 hrs.

scholarly journals Enhanced Degradation of Pharmaceutical Compounds by a Microbubble Ozonation Process: Effects of Temperature, pH, and Humic Acids

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4373 ◽  
Author(s):  
Yong-Gu Lee ◽  
Yongeun Park ◽  
Gwanghee Lee ◽  
Yeongkwan Kim ◽  
Kangmin Chon
Keyword(s):  
Humic Acids ◽  
Specific Area ◽  
Pharmaceutical Compounds ◽  
Oh Radicals ◽  
Degradation Behavior ◽  
Pump Frequency ◽  
Process Effects ◽  
Effects Of Temperature ◽  
Ozonation Process ◽  
Enhanced Degradation

This study systematically investigated the feasibility of the microbubble ozonation process to degrade the 17α-ethinylestradiol, ibuprofen, and atenolol through the comparison with the millibubble ozonation process for elucidating the degradation behavior and mechanisms during the microbubble ozonation processes. The proportions of small microbubbles (diameter 1–25 μm) were increased with increasing the cavity pump frequency (40 Hz: 51.4%; 50 Hz: 57.5%; 60 Hz: 59.9%). The increased concentrations of O3 and OH radicals due to the higher specific area of O3 microbubbles compared to O3 millibubbles could facilitate their mass transfer at the gas–water interface. Furthermore, the elevated reactivity of O3 by increasing the temperature might improve the degradation of the pharmaceutical compounds, which was more pronounced for the microbubble ozonated waters than the millibubble ozonated waters. Although the degradation efficiency of the pharmaceutical compounds during the microbubble ozonation processes was significantly influenced by the existence of humic acids compared to the millibubble ozonation process, the increased solubilization rate of O3 and OH radicals by collapsing O3 microbubbles enhanced the degradation of the pharmaceutical compounds. Overall, these results clearly showed that the microbubble ozonation process could be an alternative option to conventional ozonation processes for the abatement of the pharmaceutical compounds.

scholarly journals Effect of Temperature, Time, and Material Thickness on the Dehydration Process of Tomato

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
A. F. K. Correia ◽  
A. C. Loro ◽  
S. Zanatta ◽  
M. H. F. Spoto ◽  
T. M. F. S. Vieira
Keyword(s):  
Food Industry ◽  
Sample Thickness ◽  
Effect Of Temperature ◽  
Adiabatic Process ◽  
Processing Conditions ◽  
Drying Process ◽  
Surface Response Methodology ◽  
Effects Of Temperature ◽  
Drying Conditions ◽  
Temperature Time

This study aimed to evaluate the effects of temperature, time, and thickness of tomatoes fruits during adiabatic drying process. Dehydration, a simple and inexpensive process compared to other conservation methods, is widely used in the food industry in order to ensure a long shelf life for the product due to the low water activity. This study aimed to obtain the best processing conditions to avoid losses and keep product quality. Factorial design and surface response methodology were applied to fit predictive mathematical models. In the dehydration of tomatoes through the adiabatic process, temperature, time, and sample thickness, which greatly contribute to the physicochemical and sensory characteristics of the final product, were evaluated. The optimum drying conditions were 60°C with the lowest thickness level and shorter time.

scholarly journals Study on the emission characteristics and mechanism of sulfur-containing gas during sludge pyrolysis at low temperature

2021 ◽  
Author(s):  
Shuo Shang ◽  
Haihong Fan ◽  
Binbin Li ◽  
Lin Li ◽  
Zhou Li
Keyword(s):  
Emission Characteristics ◽  
Drying Process ◽  
Treatment Technology ◽  
Sludge Treatment ◽  
Effects Of Temperature ◽  
Sludge Drying ◽  
Temperature Time ◽  
Sulfur Containing ◽  
Addition Amount ◽  
Selection Of

Abstract The effects of temperature, time, and calcium-based ultrafine powder on sulfur-containing gas in the sludge drying process were examined through experiments, and effective measures to control the release of sulfur-containing gases such as CS2, H2S, and SO2 were proposed. Experimental results showed that the drying temperature of sludge should be controlled below 250°C, and the drying duration should be kept within 1 min. Additionally, the release amount of three gases released was small. When the addition amount of calcium-based powder added reached 20% of the original sludge mass fraction, the concentration of sulfur-containing gas released was 59.81 mg/m3, 94% lower than that of the dry pure sludge gas. After absorption by calcium-based powder, there are almost no sulfur-containing organic compounds and sulfur-containing gases. The research results provide a direction for the selection of pyrolysis sludge treatment technology, which is conducive to control the discharge of harmful gases.

Video real-time imaging of artificial membranes during freeze-drying by cryo-electron microscopy

1988 ◽  
Vol 46 ◽  
pp. 16-17
Author(s):  
Alan S. Rudolph ◽  
Ronald R. Price
Keyword(s):  
Real Time ◽  
Self Assembly ◽  
Freeze Drying ◽  
Video Capture ◽  
Drying Process ◽  
Artificial Membranes ◽  
The Past ◽  
Cryo Electron Microscopy ◽  
Spherical Structures ◽  
Capture Techniques

We have employed cryoelectron microscopy to visualize events that occur during the freeze-drying of artificial membranes by employing real time video capture techniques. Artificial membranes or liposomes which are spherical structures within internal aqueous space are stabilized by water which provides the driving force for spontaneous self-assembly of these structures. Previous assays of damage to these structures which are induced by freeze drying reveal that the two principal deleterious events that occur are 1) fusion of liposomes and 2) leakage of contents trapped within the liposome [1]. In the past the only way to access these events was to examine the liposomes following the dehydration event. This technique allows the event to be monitored in real time as the liposomes destabilize and as water is sublimed at cryo temperatures in the vacuum of the microscope. The method by which liposomes are compromised by freeze-drying are largely unknown. This technique has shown that cryo-protectants such as glycerol and carbohydrates are able to maintain liposomal structure throughout the drying process.

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