1,1-二氟乙烷

1,1-二氟乙烷,又称DFE,是一种有机氟化合物分子式 C2H4F2。它是一种无色气体,被用来冷冻。商品名为R-152aHFC-152a 。相较其它氟氯烃,它没有臭氧破坏潜势 ,较小的全球暖化潜势 (124)和较短的停留时间(1.4 年)。[2][3]

1,1-二氟乙烷[1]
别名 Difluoroethane
Freon 152a
Ethylidene difluoride
Ethylidene fluoride
HFC-152a
R-152a
DFE
识别
CAS号 75-37-6  ✓
PubChem 6368
ChemSpider 6128
SMILES
InChI
InChIKey NPNPZTNLOVBDOC-UHFFFAOYAM
RTECS KI1410000
性质
化学式 C2H4F2
摩尔质量 66.05 g/mol 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 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,所有数据均出自一般条件(25 ℃,100 kPa)下。

制备编辑

可由氟化氢乙炔在汞催化下化合生成:[4]

HCCH + 2 HF → CH3CHF2

用处编辑

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]热导管翅片式热交换器。[6]

参考资料编辑

  1. ^ 1,1-Difluoroethane页面存档备份,存于互联网档案馆) at Sigma-Aldrich
  2. ^ Changes in Atmospheric Constituents and in Radiative Forcing (PDF). Cambridge University Press: 212. 2007 [11 May 2017]. (原始内容存档 (PDF)于2007-12-15).  dead link 18 February 2019
  3. ^ Global Warming Potentials of ODS Substitutes. U.S. Environmental Protection Agency. 2010 [20 September 2010]. (原始内容存档于2010-10-16). 
  4. ^ 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. 
  5. ^ 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. 
  6. ^ 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. 

参见编辑