1,1-二氟乙烷
1,1-二氟乙烷又稱DFE,商品名為R-152a 或HFC-152a,是一種有機氟化合物,分子式C2H4F2。它是無色氣體,用於冷凍。相較其它氟氯烴,它沒有臭氧破壞潛勢、全球暖化潛勢較小、停留時間較短。[2][3]
1,1-二氟乙烷[1] | |||
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IUPAC名 1,1-Difluoroethane | |||
別名 | HFC-152a R-152a DFE | ||
識別 | |||
CAS號 | 75-37-6 | ||
PubChem | 6368 | ||
ChemSpider | 6128 | ||
SMILES |
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InChI |
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InChIKey | NPNPZTNLOVBDOC-UHFFFAOYAM | ||
RTECS | KI1410000 | ||
性質 | |||
化學式 | C2H4F2 | ||
摩爾質量 | 66.05 g·mol−1 | ||
密度 | 900 g/L(25 °C) | ||
熔點 | -117 °C(156 K) | ||
沸點 | -25 °C(248 K) | ||
溶解性(水) | 0.54%(0 °C) | ||
蒸氣壓 | 4020 mmHg/536 kPa(21.1 °C) 5.1 bar/510 kPa(20 °C) | ||
黏度 | 0.00887 cP (8.87 µPa·s)(25 °C) | ||
若非註明,所有數據均出自標準狀態(25 ℃,100 kPa)下。 |
製備
- HCCH + 2 HF → CH3CHF2
用處
1,1-二氟乙烷具有相對較低的全球暖化潛勢(GWP)指數和有利的熱物理性質,所以已被提議作為1,1,1,2-四氟乙烷的環保替代品。雖然可燃,1,1-二氟乙烷的工作壓力和容積冷卻能力(VCC)與1,1,1,2-四氟乙烷類似,可用於大型冷水機[5]或熱導管翅片式熱交換器。[6]
參見
參考資料
- ^ 1,1-Difluoroethane (頁面存檔備份,存於互聯網檔案館) at Sigma-Aldrich
- ^ Changes in Atmospheric Constituents and in Radiative Forcing (PDF). Cambridge University Press: 212. 2007 [2017-05-11]. (原始內容存檔 (PDF)於2007-12-15). dead link 18 February 2019
- ^ Global Warming Potentials of ODS Substitutes. U.S. Environmental Protection Agency. 2010 [2010-09-20]. (原始內容存檔於2010-10-16).
- ^ Siegemund, Günter; Schwertfeger, Werner; Feiring, Andrew; Smart, Bruce; Behr, Fred; Vogel, Herward; McKusick, Blaine. Fluorine Compounds, Organic. Bohnet, Matthias; Bellussi, Giuseppe; Bus, James; et al (編). Ullmann's Encyclopedia of Industrial Chemistry. John Wiley & Sons. 2010. doi:10.1002/14356007.a11_349.
- ^ Longo, Giovanni A.; Zilio, Claudio; Righetti, Giulia. Condensation of the low GWP refrigerant HFC152a inside a Brazed Plate Heat Exchanger. Experimental Thermal and Fluid Science. 2015, 68: 509–515. doi:10.1016/j.expthermflusci.2015.06.010.
- ^ Righetti, Giulia; Zilio, Claudio; Mancin, Simone; Longo, Giovanni A. Heat Pipe Finned Heat Exchanger for Heat Recovery: Experimental Results and Modeling. Heat Transfer Engineering. 2018, 39 (12): 1011–1023. Bibcode:2018HTrEn..39.1011R. S2CID 126263840. doi:10.1080/01457632.2017.1358483.