1,1-二氟乙烷
1,1-二氟乙烷又称DFE,商品名为R-152a 或HFC-152a,是一种有机氟化合物,分子式C2H4F2。它是无色气体,用于冷冻。相较其它氟氯烃,它没有臭氧破坏潜势、全球暖化潜势较小、停留时间较短。[2][3]
1,1-二氟乙烷[1] | |||
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IUPAC名 1,1-Difluoroethane | |||
别名 | HFC-152a R-152a DFE | ||
识别 | |||
CAS号 | 75-37-6 | ||
PubChem | 6368 | ||
ChemSpider | 6128 | ||
SMILES |
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InChI |
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InChIKey | NPNPZTNLOVBDOC-UHFFFAOYAM | ||
RTECS | KI1410000 | ||
性质 | |||
化学式 | C2H4F2 | ||
摩尔质量 | 66.05 g·mol−1 | ||
密度 | 900 g/L(25 °C) | ||
熔点 | -117 °C(156 K) | ||
沸点 | -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) | ||
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。 |
制备
- HCCH + 2 HF → CH3CHF2
用处
1,1-二氟乙烷具有相对较低的全球暖化潜势(GWP)指数和有利的热物理性质,所以已被提议作为1,1,1,2-四氟乙烷的环保替代品。虽然可燃,1,1-二氟乙烷的工作压力和容积冷却能力(VCC)与1,1,1,2-四氟乙烷类似,可用于大型冷水机[5]或热导管翅片式热交换器。[6]
参见
参考资料
- ^ 1,1-Difluoroethane (页面存档备份,存于互联网档案馆) at Sigma-Aldrich
- ^ Changes in Atmospheric Constituents and in Radiative Forcing (PDF). Cambridge University Press: 212. 2007 [2017-05-11]. (原始内容存档 (PDF)于2007-12-15). dead link 18 February 2019
- ^ Global Warming Potentials of ODS Substitutes. U.S. Environmental Protection Agency. 2010 [2010-09-20]. (原始内容存档于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 (编). 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.