Thermal Decomposition of Loose-Fill Cellulose Thermal Insulation

2014 ◽  
Vol 1001 ◽  
pp. 379-382
Author(s):  
Jaroslav Zigo ◽  
Peter Rantuch ◽  
Karol Balog
Keyword(s):  
Thermal Decomposition ◽  
Weight Loss ◽  
Thermal Degradation ◽  
Loss Rate ◽  
Degradation Process ◽  
Weight Loss Rate ◽  
Hot Air ◽  
Temperature Ranges ◽  
Loose Fill ◽  
Cellulose Insulation

This article deals with thermal degradation of cellulose insulation. The sample of commercially available loose-fill cellulose insulation was tested in electrically heated hot air furnace modified for thermogravimetric analysis. Weight loss, weight loss rate and CO/CO2 ratio was measured, while the sample was heated from room temperature to 530°C. Particular phases of the thermal degradation process of cellulose insulation were identified and explained. The most rapid changes caused by thermal decomposition of loose-fill cellulose insulation were reported in temperature range 270°C – 380°C. The weight loss rate reached its maximum in 308°C, which was equal to 0,198g.min-1. Two temperature ranges in which the yield of CO was higher than the yield of CO2 were detected.

Hot Air Ignition Characteristics of Cotton and Corn Straw Pellet Based on TG-DTG

2014 ◽  
Vol 672-674 ◽  
pp. 164-167
Author(s):  
Yong Zhang Cui ◽  
Yun Xia Qu ◽  
Ming Tian Tang ◽  
Peng Gao ◽  
Guo Kai Zhang
Keyword(s):  
Weight Loss ◽  
Air Temperature ◽  
Gas Flow ◽  
Loss Rate ◽  
Low Flow ◽  
Maximum Weight ◽  
Weight Loss Rate ◽  
Hot Air ◽  
Ignition Characteristics ◽  
Maximum Weight Loss

In this paper, using TG-DTG and single pellets hot air ignition experiment to study the hot air ignition characteristics of biomass forming granule, analyzes the hot air temperature, velocity, flow rate of its influence on ignition performance. It was found that the weight loss rate of surface material significantly higher than the center materials of the pellet at different heating rates through the experiment, and lignin pyrolysis accelerated leading to substantially coincide of hemicellulose, cellulose and lignin pyrolysis, With the increase of air temperature, maximum weight loss rate increased, the pellet heating rate accelerated, sped up the pellet ignition, the ignition temperature should be above 500°C. As the increase of gas flow, the weight loss of corn stalks is reduced after increased first, little change in the final weight loss. Weight loss rate is decreased first and then increased. The maximum weight loss rate is essentially the same at low flow, but the maximum weight loss rate reduced and the time extension after more than 50ml/min.

Synthesis and properties of a benzoxazine monomer containing maleimide and biphenyl groups

2021 ◽  
pp. 095400832199674
Author(s):  
Tao Guo ◽  
Yang Fan ◽  
Chang Bo ◽  
Zhang Qi ◽  
Han Tao ◽  
...  
Keyword(s):  
Weight Loss ◽  
Loss Rate ◽  
Proton Nuclear Magnetic Resonance ◽  
Significant Weight Loss ◽  
Scanning Calorimetry ◽  
Weight Loss Rate ◽  
Reaction Heat ◽  
H Nmr ◽  
Curing Reaction ◽  
Dsc Curves

Benzoxazine resin exhibits excellent properties and is widely used in many fields. Herein, the synthesis of a novel compound, the bis(2,4-dihydro-2 H-3-(4- N-maleimido)phenyl-1,3-benzoxazinyl)biphenyl (BMIPBB), has been reported, which was synthesized by reacting N-(4-aminophenyl)maleimide (APMI), formaldehyde, and 4,4’-dihydroxybiphenyl. 1,3,5-three(4-(maleimido)phenyl)-1,3,5-triazine (TMIPT) was formed as an intermediate during the reaction. The proton nuclear magnetic resonance (1H-NMR) and Fourier transform-infrared (FTIR) spectroscopy experiments were conducted to determine the structure of BMIPBB. BMIPBB was obtained as a reddish-brown solid in 40.1% yield. The thermal properties of BMIPBB were investigated using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques. Analysis of the DSC curves revealed that the broad peak representing the release of curing reaction heat appeared in the temperature range of 140–330°C. The peak temperature was 242.59°C and the heat of the reaction was 393.82 J/g, indicating that the rate of the curing reaction was low and the heat of the reaction was high. Analysis of the TGA results revealed that the weight loss rate was 5% at 110°C. The monomer exhibited a significant weight loss in the range of 320–500°C. The compound lost 50% of its weight at a temperature of 427°C.

scholarly journals Factors Affecting Post-surgical Body Weight Loss Rate of Patients with Colorectal Cancer

2018 ◽  
Vol 33 (4) ◽  
pp. 605-609
Author(s):  
Hiroki YABE ◽  
Mizuki TSUKAMOTO ◽  
Shihomi TAKEUCHI ◽  
Sayaka ITO ◽  
Kan OMI ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Weight Loss ◽  
Body Weight ◽  
Loss Rate ◽  
Body Weight Loss ◽  
Weight Loss Rate ◽  
Factors Affecting

scholarly journals Biocontrol of Pear Postharvest Decay by Kombucha

2019 ◽  
Vol 47 (3) ◽  
Author(s):  
Junping TAN ◽  
Xian ZHOU ◽  
Shuiyuan CHENG ◽  
Zexiong CHEN ◽  
Yuanyuan GOU ◽  
...  
Keyword(s):  
Weight Loss ◽  
Electric Conductivity ◽  
Room Temperature ◽  
Loss Rate ◽  
Economic Benefits ◽  
Control Group ◽  
Pear Fruit ◽  
Weight Loss Rate ◽  
Post Harvest ◽  
Mda Content

Kombucha is sweetened, slightly alcoholic, and lightly effervescent tea drink. Its acidity inhibits the growth of harmful bacteria. Here, we studied effect of kombucha on post-harvest preservation of pear. The Hosui pears were soaked with the kombucha for 15 minutes, and in distilled water as the control, respectively. Superoxide dismutase (SOD), peroxidase (POD), malondialdehyde (MDA), hydrogen peroxide (H2O2), proline content, electric conductivity, weight loss rate and good fruit rate in pear were measured during storage at room temperature. The results showed that the kombucha could effectively prolong the storage time of pear fruit. The fruit quality of the treated group was 1.5 times higher than that of the control pear fruit when stored at room temperature for 18 days. The weight loss rate, MDA content and electric conductivity of the treatment group were lower than those of the control group during the whole storage period, indicating that kombucha can inhibit the transformation of polysaccharides such as starch and pectin, and delay the degradation of nutrients in the fruit, resulting in a decrease in weight loss rate, inhibition of membrane lipid peroxidation, reducing MDA content, electric conductivity, maintaining cell membrane stability, delaying pear fruit senescence. Kombucha can inhibit the content of H2O2 and proline, increase the activity of POD and SOD increase the storage stability of fruits. The purpose of this study was to elucidate the physiological mechanism of post-harvest preservation of pear by kombucha. The use of kombucha can prolong the supply period of pear, increase economic benefits and expand the market of pear.   ********* In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 3, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue. *********

Exposure Test Results of Lu2Si2O7 in Combustion Gas Flow at High Temperature and High Speed

2004 ◽  
Author(s):  
Isao Yuri ◽  
Tohru Hisamatsu ◽  
Shunkichi Ueno ◽  
Tatsuki Ohji
Keyword(s):  
Weight Loss ◽  
Water Vapor ◽  
Partial Pressure ◽  
Gas Flow ◽  
Loss Rate ◽  
Gas Temperature ◽  
Weight Loss Rate ◽  
Combustion Gas ◽  
Vapor Partial Pressure ◽  
Water Vapor Partial Pressure

In order to understand recession behavior and the amount of recession of Lu2Si2O7 in the combustion gas flow, sintered Lu2Si2O7 specimens were manufactured by hot pressing and exposed under various combustion gas flow conditions (T = 1300–1500 °C, P = 0.3 MPa, V = 150 m/s, PH2O = 27–69 kPa, t = 10h). After the exposure tests, etch pits, which are assumed to form due to volatilization of SiO2 in the grain boundary phase, were observed at the surface of specimen. The amount of Lu2SiO5 phase at the surface of specimen increased with the increase of gas temperature or water vapor partial pressure. A corresponding decrease in the amount of Lu2Si2O7 phase was observed. Furthermore, by using the average weight loss rate for exposure times of ten hours, the influence of gas temperature and water vapor partial pressure on weight loss rate was examined, and the amount of recession under gas turbine conditions was calculated.

Study of Thermal Degradation of Polymers

2013 ◽  
Vol 652-654 ◽  
pp. 1664-1667 ◽  
Author(s):  
Ivana Turekova ◽  
Zuzana Turňová ◽  
Karol Balog ◽  
Martin Pastier
Keyword(s):  
Thermal Degradation ◽  
Ignition Temperature ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Combustion Process ◽  
Hot Air ◽  
Controlled Burning ◽  
Important Position ◽  
Fire Characteristics

This article deals with measurements of selected waste polymers in the combustion process. The technology of controlled burning occupies an important position in the process of waste disposal. Therefore it is necessary to assess the behaviour of materials in the process of thermal degradation by fire characteristics. An experiment was conducted in accordance with standard STN ISO 871: 2010 Plastics. Determination of ignition temperature using a hot-air furnace. There were studied a mass loss rate of the samples in their degradation and also monitored some products of combustion.

Aging Mechanism of Dam Concrete under the Action of Freeze-Thaw Damage

2014 ◽  
Vol 584-586 ◽  
pp. 2121-2124
Author(s):  
Yan Shi ◽  
Hua Quan Yang ◽  
Xiang Li ◽  
Jia Zheng Li
Keyword(s):  
Weight Loss ◽  
Elastic Modulus ◽  
Concrete Structure ◽  
Loss Rate ◽  
Hydration Products ◽  
Weight Loss Rate ◽  
Freeze Thaw ◽  
Aging Mechanism ◽  
Dam Concrete ◽  
Air Entrained Concrete

Aging mechanism of dam concrete under the action of freeze-thaw damage was analyzed by testing macro and micro performance. The results show that compressive, splitting tensile and flexural strengths reached 58.4%, 61.3% and 57.8% of the initial values after 150 cycles. Strength is the most sensitive indicator of freeze-thaw damage, followed by weight loss rate, relative dynamic elastic modulus and ultrasonic velocity. After freeze-thaw damage, concrete structure becomes loose, porous amount gradually increased and pore size especially over 25nm expanded. Microcracks not only exist in the hydration products, but also destroy the bubbles structure in air entrained concrete, which is the main cause of freeze-thaw damage.

Effects of Catalysts on Pyrolysis of Chlorella

2012 ◽  
Vol 433-440 ◽  
pp. 161-165
Author(s):  
Gui Ju Li ◽  
Ru Yu Zhao ◽  
Li Ping Bai
Keyword(s):  
Weight Loss ◽  
Loss Rate ◽  
Inorganic Compounds ◽  
Optimal Dosage ◽  
Maximum Weight ◽  
Weight Loss Rate ◽  
Two Factors ◽  
Catalytic Effects ◽  
Derivative Thermogravimetry ◽  
Maximum Weight Loss

Sodium compounds, Na2CO3，Na2SO4，NaCl, have been investigated with regard to their catalytic effects on chlorella pyrolysis by thermal analysis experiments. The influence of catalyst categories and dosage on chlorella pyrolysis were studied by the comparison and analysis of the TG（thermogravimetry）and DTG(derivative thermogravimetry) curves derived from tests of differential thermal balance of untreated chlorelal and chlorella mixed with three inorganic compounds of certain scale.The results show that the catalytic effect of the sodium compounds follow Na2CO3>Na2SO4>NaCl, Catalysts of Na2SO4，NaCl decreased the maximum weight loss rates while Na2CO3 increased them. And all the three additives lowered the pyrolysis temperature of chlorella，of which Na2CO3 made the highest conversion of chlorella pyrolysis. As the dosage of carbonate increased, the pyrolysis temperatures decreases and the maximum weight loss rate increases, but the conversion rate of chlorella pyrolysis decreases, considering these two factors, 5%wt is chosen as the optimal dosage of the catalysts.

Experimental Study on the Effect of Ultrasonic Cavitation on Pyrolysis Characteristics of Oil Shale

2013 ◽  
Vol 295-298 ◽  
pp. 3117-3123
Author(s):  
Hong Tian ◽  
Zheng Zhu Liao
Keyword(s):  
Weight Loss ◽  
Particle Size ◽  
Organic Matter ◽  
Oil Shale ◽  
Loss Rate ◽  
Ultrasonic Cavitation ◽  
Ultrasonic Frequency ◽  
Ultrasonic Power ◽  
Weight Loss Rate ◽  
Peak Value

In order to investigate the pyrolysis characteristics of oil shale under in the extreme conditions of high temperature and high pressure generated by the ultrasonic cavitation. The different particle size of oil shale is mixed with water in accordance with the volume ratio of 1:12, under in different ultrasonic frequency and different power, the ultrasonic radiation experiments and the thermogravimetric experiments of different samples have been done. The results show that the organic content of oil shale samples reduced after ultrasonic radiation, and the chemical reaction rate of the remaining organic matter become faster, and its reflected as the volatile separate out rate was accelerated and the changes of TG(Thermogravimetry) and DTG(Derivative Thermogravimetry) curves were steeper. Oil shale pyrolysis weight loss rate peak values and the organic matter decomposed percentage during the pyrolysis have the selective on the ultrasonic frequency, ultrasonic power and particle size of the oil shale. Oil shale pyrolysis weight loss rate peak value increased with decreasing of ultrasonic power, and the weight loss rate peak value corresponding to the peak temperature was increased with the increasing of ultrasonic frequency, and the weight loss rate peak value corresponding temperature decreased with particle size increasing of oil shale. We can draw the conclusion that the ultrasonic cavitation can decomposition organic matter of oil shale, then, we should in-depth research the ultrasonic refining shale oil.

scholarly journals Nondestructive Detection of Weight Loss Rate, Surface Color, Vitamin C Content, and Firmness in Mini-Chinese Cabbage with Nanopackaging by Fourier Transform-Near Infrared Spectroscopy

Foods ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 2309
Author(s):  
Qiang Liu ◽  
Shaoxia Chen ◽  
Dandan Zhou ◽  
Chao Ding ◽  
Jiahong Wang ◽  
...  
Keyword(s):  
Weight Loss ◽  
Fourier Transform ◽  
Chinese Cabbage ◽  
Loss Rate ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Prediction Performance ◽  
Surface Color ◽  
Weight Loss Rate ◽  
Plsr Model

A nondestructive optical method is described for the quality assessment of mini-Chinese cabbage with nanopackaging during its storage, using Fourier transform-near infrared (FT-NIR) spectroscopy. The sample quality attributes measured included weight loss rate, surface color index, vitamin C content, and firmness. The level of freshness of the mini-Chinese cabbage during storage was divided into three categories. Partial least squares regression (PLSR) and the least squares support vector machine were applied to spectral datasets in order to develop prediction models for each quality attribute. For a comparative analysis of performance, the five preprocessing methods applied were standard normal variable (SNV), first derivative (lst), second derivative (2nd), multiplicative scattering correction (MSC), and auto scale. The SNV-PLSR model exhibited the best prediction performance for weight loss rate (Rp2 = 0.96, RMSEP = 1.432%). The 1st-PLSR model showed the best prediction performance for L* value (Rp2 = 0.89, RMSEP = 3.25 mg/100 g), but also the lowest accuracy for firmness (Rp2 = 0.60, RMSEP = 2.453). The best classification model was able to predict freshness levels with 88.8% accuracy in mini-Chinese cabbage by supported vector classification (SVC). This study illustrates that the spectral profile obtained by FT-NIR spectroscopy could potentially be implemented for integral assessments of the internal and external quality attributes of mini-Chinese cabbage with nanopacking during storage.

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