1 / 4

Report of the Scientific Assessment Panel

Report of the Scientific Assessment Panel. Cl. OEWG, 33 rd meeting, Bangkok , 24–28 June 2013. ODP and GWP of 1,2-dichlorohexafluoro-cyclobutane (c-C 4 F 6 Cl 2 , RC-316c). Cl. Commercial R-316c is as a mixture of 52% ( E )- and 48% ( Z )- isomers. ( Z )-R-316c. ( E )-R-316c.

kobe
Télécharger la présentation

Report of the Scientific Assessment Panel

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Report of the Scientific Assessment Panel Cl OEWG, 33rdmeeting, Bangkok, 24–28 June 2013 ODP and GWP of 1,2-dichlorohexafluoro-cyclobutane (c-C4F6Cl2, RC-316c) Cl • Commercial R-316c is as a mixture of 52% (E)- and 48% (Z)- isomers (Z)-R-316c (E)-R-316c • lifetime primarily determined by photolysis in the stratosphere • Isomers have different atmospheric photolysis rates and, hence, different atmospheric lifetimes, ODP, and GWP • Both isomers are long-lived; have high ODP and GWP Cl Cl OEWG Bangkok June 2013 R316c

  2. UV absorption cross sections of RC-316c Burkholder et al., 2013 (recent work) Temperature (K) 296 233 • Absorption cross sections of the individual isomers have been measured. • Absorption cross sections were measured as a function of temperature • The E-isomer absorbs UV more than the Z-isomer 273 213 253 (Z)-R-316c Cl Cl (E)-R-316c Cl Cl Atmos. l Range OEWG Bangkok June 2013 R316c

  3. Infrared cross section of RC-316c Burkholder et al., 2013 (recent work) Calculated Radiative Efficiency(W m-2 ppb-1) (Z)-R-316c 0.282 Cl Cl (E)-R-316c 0.310 Cl • Measured IR cross sections are slightly different • Calculated radiative efficiency differ by ~10% Cl OEWG Bangkok June 2013 R316c

  4. ODP and GWP of RC-316c Cl Cl (E)-R-316c (Z)-R-316c Atmospheric Lifetime (2-D model) Fleming et al., 2013 114 years 75 years ODP (semi-empirical) ~0.6-0.7 ~0.5 GWP-20 4885 5615 Cl GWP-100 4360 5800 Cl Bottom Line: ODP and GWP of R-316c is similar to, and slightly smaller than, CFC-11 and CFC-12 OEWG Bangkok June 2013 R316c

More Related