Description: The production of fluorochemicals and PTFE monomers can be summarized with the following chemical reactions (Cedergren et al. 2001): CaF2 + H2SO4 -> CaSO4 + 2HF (1) CH4 + 3Cl2 -> CHCl3 + 3HCl (2) CHCl3 + 2HF -> CHClF2 + 2HCl (3) 2 CHClF2 + heat -> CF2=CF2 + 2 HCl (4) This dataset represents the last reaction step (4). Parts of the production are carried out at high pressure and high temperature, 590 ºC – 900 ºC. The first reaction (1) takes place in the presence of heat and HSO3 - and steam. The inventory for the production of hydrogen fluoride can be found in the report (Jungbluth 2003a). Reaction (2) is used to produce trichloromethane. Reaction 3 for the production of chlorodifluoromethane takes place in the presence of a catalyst. The production of PTFE (4) takes place under high temperature pyrolysis conditions. Large amounts of hydrochloric acid (HCl) are generated as a couple product during the process and are sold as a 30% aqueous solution. A large number of other by-products and emissions is formed in the processes (benzene, dichloromethane, ethylene oxide, formaldehyde, R134a, and vinyl chloride) and small amounts of the highly toxic perfluoroisobutylene CF2=C(CF3)2. The by-products in the production of monomers can harm the processes of polymerisation. Because of this, the refinement of the production of monomers has to be very narrow. This makes the process complex and it contributes to a high cost for the PTFE-laminates. (Cedergren et al. 2001). References: Althaus H.-J., Chudacoff M., Hischier R., Jungbluth N., Osses M. and Primas A. (2007) Life Cycle Inventories of Chemicals. Final report ecoinvent data v2.0 No. 8. Swiss Centre for Life Cycle Inventories, Dübendorf, CH.
Types:
Text {
text_type: Report,
}
Comment: This dataset represents the production of 1 kg of tetrafluoroethylene (TFE). TFE is the most important fluoroolefin; it is used mainly for the production of fluoropolymers such as polyfluoroethylene (PTFE). PTFE resin is used primarily in electrical applications such as insulation, flexible printed circuits, and piezoelectric devices. Tetrafluoroethylene is also used in the production of low molecular mass compounds and intermediates, e.g., for the manufacture of iodoperfluoroalkanes (Siegemund et al. 2016). References: Althaus H.-J., Chudacoff M., Hischier R., Jungbluth N., Osses M. and Primas A. (2007) Life Cycle Inventories of Chemicals. Final report ecoinvent data v2.0 No. 8. Swiss Centre for Life Cycle Inventories, Dübendorf, CH. Siegemund, G., Schwertfeger, W., Feiring, A., Smart, B., Behr, F., Vogel, H., McKusick, B. and Kirsch, P. 2016. Fluorine Compounds, Organic. Ullmann's Encyclopedia of Industrial Chemistry. Gendorf (2016) Umwelterklärung 2015, Werk Gendorf Industriepark, www.gendorf.de.
Origin: /Bund/UBA/ProBas
Tags: Ethylenoxid ? Fluorwasserstoff ? Benzol ? Katalysator ? Salzsäure ? Schwefelsäure ? Wasserdampf ? Formaldehyd ? Schweiz ? Methan ? Pyrolyse ? Vinylchlorid ? Wärmeerzeugung ? Wasserstoffherstellung ? Chemikalien ? Daten ? Nebenprodukt ? Polymerisation ? Abschlussbericht ? Chemische Reaktion ? Manufacture of basic chemicals, fertilizers and nitrogen compounds, plastics and synthetic rubber in primary forms ? Manufacture of chemicals and chemical products ? Manufacture of plastics and synthetic rubber in primary forms ? Manufacturing ?
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Language: Deutsch
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