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cf4 control of emissions Quantitative

cf4 control of emissions Quantitative

Tetrafluoromethane, also known as carbon tetrafluoride or R-14, is the simplest perfluorocarbon (C F 4).As its IUPAC name indicates, tetrafluoromethane is the perfluorinated counterpart to the hydrocarbon methane.It can also be classified as a haloalkane or halomethane.Tetrafluoromethane is a useful refrigerant but also a potent greenhouse gas. It has a very high bond strength due to the ...

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  • Protocol for Measurement of Tetrafluoromethane (CF4) and

    Rearranging in the form to calculate the facility specific AEO factor: Equation 4: CF4Overvoltage factor, FOV= EFCF4(kg CF4/metric ton Al) ×CE/AEO. For all facilities, whether using the slope method or overvoltage method, C2F6emission factors are determined as a weight fraction of

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  • A Carbon Arc Process for Treatment of CF4 Emissions

    Light perfluorocarbons, such as carbon tetrafluoride, are produced or emitted from a variety of processes, including manufacture of aluminum and processing of semiconductor devices. At the same time, the long atmospheric lifetime and high global warming potential of such compounds makes them an environmental concern. A new process for the abatement of perfluorocarbon emissions using a carbonCited by: 13

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  • Carbon tetrafluoride - Wikipedia

    Tetrafluoromethane, also known as carbon tetrafluoride or R-14, is the simplest perfluorocarbon (C F 4).As its IUPAC name indicates, tetrafluoromethane is the perfluorinated counterpart to the hydrocarbon methane.It can also be classified as a haloalkane or halomethane.Tetrafluoromethane is a useful refrigerant but also a potent greenhouse gas. It has a very high bond strength due to theChemical formula: CF₄

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  • ACP - Inverse modelling of CF4 and NF3 emissions in East Asia

    We calculate emissions of CF 4 to be quite constant between the years 2008 and 2015 for both China and South Korea, with 2015 emissions calculated at 4.33 ± 2.65 Gg yr-1 and 0.36 ± 0.11 Gg yr-1, respectively. Emission estimates of NF 3 from South Korea could be made with relatively small uncertainty at 0.6 ± 0.07 Gg yr-1 in 2015.Cited by: 6

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  • CF4 and C2F6 in the atmosphere - Fabian - 1987 - Journal

    They show CF4 decreasing from about 67 parts per trillion by volume (pptv) in the troposphere to 60 pptv at 35 km, while C2F6 falls off... CF4 and C2F6 in the atmosphere - Fabian - 1987 - Journal of Geophysical Research: Atmospheres - Wiley Online LibraryCited by: 32

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  • Continuous Emission Monitoring of Tetrafluoromethane

    This methodology involves the use of tunable diode laser absorption spectroscopy (TDLAS) to monitor CF4 and C2F6 emission levels in the ducts leading from the potrooms.

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  • Tuning characteristics of an optically pumped CF4 laser

    Aug 15, 1982The operation of a 16 μm pulsed CF4 laser optically pumped by a fine-tuned, frequency-narrowed, high-power CO2 laser is reported. Seventeen emission l…

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  • Main sources of fluorinated gas emissions | Whats Your Impact

    Less than 0.1% of total PFC emissions is caused by natural sources. Small amounts of CF4 are found in fluorite, granite and natural gas deposits. Geochemical reactions in the lithosphere cause these emissions. Natural sources are estimated to produce 10 tonnes of CF4 annually.7. Fluorinated gas emissions:

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  • PFC Emissions Monitoring by FT-IR in LCD Manufacturing

    Ai,p = Fraction of gas volume fed into processes with emission control technologies Ci,p= Use rate (fraction destroyed or transformed) for each gas i and CF4 ##Process Chemical ~8,000ppm 2 CF4_Z3A, _15A, 2CF429, 59 On Site Quantitative Analysis of all PFCs and most of the HAPs

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  • Chapter 6: Emissions in an Internal Combustion Engine

    UNDESIRABLE EMISSIONS IN INTERNAL COMBUStion engines are of major concern beause of their negative impact on air quality, human health, and global warming.Therefore, there is a concerted effort by most governments to control them. Undesirable emissions include unburned hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx), and particulate matter (PM).

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  • Natural CF4 and SF6 on Earth - Harnisch - 1998

    Jerry Marks, Reduction of perfluorinated carbon compound emissions from primary aluminum production, Non-CO2 Greenhouse Gases: Scientific Understanding, Control and Implementation, 10.1007/978-94-015-9343-4, (369-376), (2000).

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  • Jochen HARNISCH | Head of Division | Ph.D. | Climate and

    The occurrence of CF4 and SF6 in natural fluorites (CaF2) is reported. Contents are found to be typically 200–2000 ppt-mass for CF4 and 50–100 ppt-mass for SF6.

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  • EMF 12: Controlling Global Carbon Emissions - Cost and

    Thus, if only the OCED countries control emissions, that may have only a very minor impact on world emissions and world climate. If only part of the OCED participates the impact would be even less. The twelfth Energy Modeling Forum (EMF) working group met five times from September 1990 to May 1992 to compare alternative projections of the

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  • Quantitative assessment of atmospheric emissions of toxic

    rate for various air pollutant control devices (APCDs). 2 Methodologies, data sources and key assumptions We estimate the atmospheric emissions of the 12 target HMs (Hg, As, Se, Pb, Cd, Cr, Ni, Sb, Mn, Co, Cu, and Zn) from primary anthropogenic sources by combining the specific an-nual activities and dynamic emission factors by source cate-

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  • Developing a Reliable Fluorinated Greenhouse Gas (F-GHG

    CF4 emission volumes were determined per wafer for two etch processes, trench and via etch, on each chamber. Figure 6 shows the CF4 emission profile observed for the monitored Back End (BE) trench etch for several wafers monitored on each chamber. Integration of the CF4 emission peaks yielded volumes contained in Table V.

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  • FACTORS AFFECTING PFC EMISSIONS FROM COMMERCIAL

    emission rate as a function of time on AE was made to better understand differences in emission rates between facilities operating with similar technologies and those operating with different technology types. The effects of cell design and control strategies on PFC emissions were considered. In addition, the

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  • A model-based technique for real-time estimation of

    argon dilution and requires only optical emission spectros-copy and total pressure measurements. This work is a portion of a larger effort in the University of Michigan Electronics Manufacturing and Control Systems Laboratory to apply real-time control to semiconductor manufacturing.8,9,18,28 Because actinometry is an in situ, non-

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  • Quantitative impacts of meteorology and precursor emission

    Abstract. China is experiencing increasingly serious ambient ozone pollution, including the economically developed Pearl River Delta (PRD) region. However, the underlying reasons for the ozone increase remain largely unclear, leading to perplexity regarding formulating effective ozone control strategies. In this study, we quantitatively examine the impacts of meteorology and precursor

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  • Historical Emissions of HFC-23 (CHF3) in China and

    Trifluoromethane (CHF3, HFC-23) is one of the hydrofluorocarbons (HFCs) regulated under the Kyoto Protocol with a global warming potential (GWP) of 14 800 (100-year). China’s past, present, and future HFC-23 emissions are of considerable interest to researchers and policymakers involved in climate change. In this study, we compiled a comprehensive historical inventory (1980–2012) and a

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  • Stack Emission Monitoring Stack Emission Testing

    Stack Emission Monitoring Testing Services by our Company. Perfect Pollucon Services offer Stack emission testing and Source Emission monitoring services to keep a check on industrial waste stream that is released into the atmosphere. Every industry or manufacturing company has to notify their stack emission levels to the pollution control board.

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  • Effect of CO and CO2 addition to the CF4/O2 gas

    The effect of CO and CO2 addition to a CF4/O2 plasma on the etching characteristics of a low‐pressure chemical vapor deposition tungsten film has been studied in a reactive ion etching reactor.

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  • David Branken - Chair holder: Eskom Power Plant Institute

    My research within the chair, also known as the EPPEI Specialisation Centre for Emissions Control, is focused on post-combustion flue gas treatment, i.e. flue gas desulfurization (wet, dry andTitle: Chair: Eskom-EPPEI

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