Grey System Theoretical Analysis on the Influence of Volatile Organic Compounds Emission from Asphalt on its Performance

2013 ◽  
Vol 753-755 ◽  
pp. 481-485
Author(s):  
Hong Hua Zhang ◽  
Shao Peng Wu ◽  
Ling Pang ◽  
Kim Jenkins ◽  
Man Yu ◽  
...  
Keyword(s):  
System Theory ◽  
High Temperature ◽  
Volatile Organic Compounds ◽  
Physical Properties ◽  
Organic Compounds ◽  
Grey System Theory ◽  
Grey System ◽  
Voc Emission ◽  
Volatile Organic ◽  
Light Components

Light components in the asphalt can volatilize under the circumstances of high temperature or long-term service process, leading to the deteriorating of the asphalt pavement. This paper tried to discuss the influences of volatile organic compounds (VOC) emission from the asphalt on physical properties in the high temperature (at 180) by grey system theory. Both Heat and Vacuum environment were monitored as the emission conditions and the emission temperature was 180°C, physical properties of asphalt, released and unreleased were analyzed. Basic tests, including mass change, chemical compositions, penetration and soften point, were used to compare the influences of VOC emission on the asphalts performances. Meanwhile, grey system theory was used to investigate the sequent performances influenced by VOC emission. Results show that physical properties and four generic components of the asphalts are affected obviously in these two emission conditions, and the oxygen may promote VOC emission from the asphalt. In additional, the greatest factor associating with VOC emission is light components in the asphalt.

Influence of VOC Emission on Asphalt Components

2014 ◽  
Vol 599 ◽  
pp. 178-181 ◽  
Author(s):  
Hong Hua Zhang ◽  
Pei Qiang Cui ◽  
Liu Jing Zi Qiu ◽  
Shao Peng Wu
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Volatile Organic Compounds ◽  
Low Temperature ◽  
Organic Compounds ◽  
Chemical Components ◽  
Chemical Compositions ◽  
Voc Emission ◽  
Volatile Organic ◽  
Different Temperatures

Volatile organic compounds (VOC) emission from different asphalts not only causes the change in the performances of the bitumen, but also its chemical compositions. This paper carried out four-component analysis to study the influence of VOC emission from different asphalts on bitumens chemical compositions under different conditions. Results show that four-component of asphalts from different places is different. Also as the time of VOC emission increases, the total contents of resins and asphaltenes increase, but the total contents of saturates and aromatics decrease. VOC emission under different temperatures also has a great impact on the asphalt chemical components; Saturates and aromatics decrease in high temperature is larger than in low temperature, and there exists big differences in the asphalt surface layer and the internal of chemical components.

Energetics of cellulose and cyclodextrin glycosidic bond cleavage

2017 ◽  
Vol 2 (2) ◽  
pp. 201-214 ◽  
Author(s):  
Cheng Zhu ◽  
Christoph Krumm ◽  
Gregory G. Facas ◽  
Matthew Neurock ◽  
Paul J. Dauenhauer
Keyword(s):  
High Temperature ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Bond Cleavage ◽  
Thermochemical Conversion ◽  
Lignocellulosic Materials ◽  
Renewable Chemicals ◽  
Volatile Organic ◽  
Glycosidic Bond Cleavage ◽  
Long Chain

Thermochemical conversion of lignocellulosic materials for production of biofuels and renewable chemicals utilizes high temperature to thermally decompose long-chain cellulose to volatile organic compounds.

Measurements of VOC Emission from Polyurethane Varnish for Interior Use

2012 ◽  
Vol 193-194 ◽  
pp. 345-350
Author(s):  
Jing Chen ◽  
Neng Zhu ◽  
Xin Li Shi
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Experimental Results ◽  
Total Volatile ◽  
Environmental Chamber ◽  
Voc Emission ◽  
Period 2 ◽  
Volatile Organic ◽  
Two Temperatures ◽  
Total Volatile Organic Compounds

The emission of volatile organic compounds (VOC) from single-component polyurethane varnish applied to beech plywood at two temperatures (33°C, 43°C) has been investigated in a small environmental chamber. The experimental results indicated that the concentration of each compound, as well as the total volatile organic compounds (TVOC), increased rapidly after the start of experiment, and attained their maximum values at 0.5 h. The concentrations decreased rapidly after 0.5 h, and then decreased more slowly in the period 2 – 24 h. The concentrations of isopropylbenzene, n-decane and TVOC were higher in the 43°C test than in the 33°C test within the first 1.5 h. The influences of temperature on the concentrations of these pollutants were different during the period 1.5 – 24 h.

scholarly journals Emission of Volatile Organic Compounds from Heartwood and Sapwood of Selected Coniferous Species

Forests ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 92 ◽  
Author(s):  
Magdalena Czajka ◽  
Beata Fabisiak ◽  
Ewa Fabisiak
Keyword(s):  
Volatile Organic Compounds ◽  
Norway Spruce ◽  
Organic Compounds ◽  
Scots Pine ◽  
Composition Analysis ◽  
European Larch ◽  
Voc Emission ◽  
Percentage Contribution ◽  
Qualitative And Quantitative ◽  
Volatile Organic

The qualitative and quantitative composition of volatile organic compounds (VOC) emitted from furnishings from solid wood and all kinds of wood derivative materials depends on many factors, of which the most important is the wood species. The intraspecies and interspecies differences in VOC emission result from the differences in the chemical composition and anatomical structure of heartwood and sapwood of different species. VOC composition analysis was performed separately for heartwood and sapwood of Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) Karst.) and European larch (Larix decidua Mill.) trees. The studies were conducted in a glass climatic chamber of 0.025 m3, equipped with a system for the monitoring and control of climatic conditions. Samples of air for analyses were collected after 3, 7, 14 and 28 days of exposure. The results provided evidence for interspecies and intraspecies differences in the qualitative and quantitative compositions of VOC. The concentration of total VOC (TVOC) released from heartwood of Scots pine was higher than that released from sapwood. For European larch and Norway spruce, the opposite relations were observed. The VOC emission from Scots pine heartwood was about 17 times higher than the emission from European larch and Norway spruce heartwood. The differences in TVOC emitted from the sapwood of samples from different species were smaller. For each of the species, the highest percentage contribution to TVOC was made by terpenes. The second highest percentage contribution in TVOC was made by compounds containing a carbonyl group, mainly aldehydes, while aromatic compounds made the third highest contribution.

scholarly journals Influence of the spatial resolution of satellite-derived vegetation parameters on the biogenic Volatile Organic Compounds (VOC) emission modeling

2014 ◽  
Vol 6 (1) ◽  
Author(s):  
Carlos Silveira ◽  
Oxana Tchepel
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Spatial Resolution ◽  
Atmospheric Chemistry ◽  
Vegetation Index ◽  
Meteorological Data ◽  
Area Index ◽  
Voc Emission ◽  
Volatile Organic ◽  
Vegetation Parameters

AbstractVegetation is a natural source of Volatile Organic Compounds (VOC) that plays an important role in atmospheric chemistry. The main objective of the current study is to implement a model to quantify process-based VOC emissions from plants that focuses on the relationship between the sensitivity of VOC emission estimates to spatial resolution data, based on scientific knowledge and vegetation dynamics derived from satellite observations. The Normalized Difference Vegetation Index (NDVI) and Leaf Area Index (LAI) were elected to examine this issue using different resolutions of satellite-derived products: 22m from the DEIMOS-1 satellite, and 250m and 1000m provided by MODIS. The study is focused on an area of 80×80km2 in Portugal for 2011. Detailed land cover and meteorological data are also included in the emission quantification algorithm. The primary outcomes were determined using a multi-scale analysis showing spatial and temporal variations in the vegetation parameters and modeling results. The results confirm that the emissions model is highly sensitive to the spatial resolution of the satellite-derived data, resulting in about a 30% difference in total isoprene emissions for the study area.

Simulation von VOC-Emissionssequenzen unter Zuhilfenahme des Hybridmodells/Simulation of VOC emission sequences by means of the hybrid model

Gefahrstoffe ◽  
2020 ◽  
Vol 80 (04) ◽  
pp. 151-157
Author(s):  
M. Seitz ◽  
M. Schwager ◽  
A. Burdack-Freitag
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Hybrid Model ◽  
Voc Emission ◽  
Volatile Organic ◽  
Mathematisches Modell

Emissionsuntersuchungen unterschiedlichster Materialien auf mensch- und umweltgefährliche flüchtige organische Verbindungen (volatile organic compounds, VOC) weisen auf ein zeitabhängiges Emissionsverhalten hin. In der vorliegenden Arbeit wurde anhand eines Vorhersagemodells ein prinzipieller Trend von Emissionskonzentrationen berechnet und mit empirisch ermittelten Daten unterlegt. Zunächst wurde auf Basis von vorliegenden Daten eine Clusterung von VOC vorgenommen und infrage kommende Faktoren aufgegriffen, die einen Einfluss auf das Emissionsverhalten von VOC haben können. Danach wurde eine Priorisierung der Einflussfaktoren auf der Grundlage experimen- teller Beobachtungen und publizierter Daten vorgenommen. Anhand eines stark emittierenden polymeren Materials wurden beispielhaft, unter Verwendung einer Emissionsprüfkammer, Emissionskonzentrationsmessungen durchgeführt. Im Anschluss wurden über ein mathematisches Modell die grafischen Verläufe simuliert. Die realen Daten belegten das Rechenmodell, seine prinzipielle Anwendbarkeit und die vorgenommene Clusterung.

scholarly journals Leaf level emissions of volatile organic compounds (VOC) from some Amazonian and Mediterranean plants

2013 ◽  
Vol 10 (9) ◽  
pp. 5855-5873 ◽  
Author(s):  
A. Bracho-Nunez ◽  
N. M. Knothe, ◽  
S. Welter ◽  
M. Staudt ◽  
W. R. Costa ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Plant Species ◽  
Tree Species ◽  
Mediterranean Species ◽  
Voc Emission ◽  
Mediterranean Plants ◽  
Volatile Organic ◽  
Leaf Level ◽  
The Mediterranean

Abstract. Emission inventories defining regional and global biogenic volatile organic compounds (VOC) emission strengths are needed to determine the impact of VOC on atmospheric chemistry (oxidative capacity) and physics (secondary organic aerosol formation and effects). The aim of this work was to contribute with measurements of tree species from the poorly described tropical vegetation in direct comparison with the quite well-investigated, highly heterogeneous emissions from Mediterranean vegetation. VOC emission from sixteen plant species from the Mediterranean area were compared with twelve plant species from different environments of the Amazon basin by an emission screening at leaf level using branch enclosures. Analysis of the volatile organics was performed online by a proton-transfer-reaction mass spectrometer (PTR-MS) and offline by collection on adsorbent tubes and subsequent gas chromatographic analysis. Isoprene was the most dominant compound emitted followed by monoterpenes, methanol and acetone. The average loss rates of VOC carbon in relation to the net CO2 assimilation were found below 4% and indicating normal unstressed plant behavior. Most of the Mediterranean species emitted a large variety of monoterpenes, whereas only five tropical species were identified as monoterpene emitters exhibiting a quite conservative emission pattern (α-pinene < limonene < sabinene < ß-pinene). Mediterranean plants showed additional emissions of sesquiterpenes. In the case of Amazonian plants no sesquiterpenes were detected. However, missing of sesquiterpenes may also be due to a lack of sensitivity of the measuring systems. Furthermore, our screening activities cover only 1% of tree species of such tropical areas as estimated based on recent biodiversity reports. Methanol emissions, an indicator of growth, were found to be common in most of the tropical and Mediterranean species. A few species from both ecosystems showed acetone emissions. The observed heterogeneous emissions, including reactive VOC species which are not easily detected by flux measurements, give reason to perform more screening at leaf level and, whenever possible, within the forests under ambient conditions.

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