### Global Warming Potential

Perfluoromethyl Morpholine (PMM) (CAS Number: 382-2 8-5)

Summary: This document describes analysis conducted by 3M to determine a Global Warming Potential (GWP) for 

### perfluoromethyl morpholine . The format of this report is consistent with submittals to EPA for the use of Provisional GWPs. The Mandatory Reporting Rule requires facilities to monitor and report CO 2 -equivalent F-GHG process vent emissions, if those emissions exceed a threshold of 10,000 metric tons CO 2 -equivalent per year. [1] Estimated CO 2 -equivalent emissions are obtained by multiplying t he F-GHG mass emissions by the Global Warming Potential (GWP) for the individual f luorinated gases that comprise the flow. EPA has provided a table of 100-year time horizon G WP values for about 70 individual FGHG, and specifies that these values are to be used for the purpose of computing CO 2

- equivalent emissions. [2] Default GWPs can be used for any fluorinated-GHG not listed in Table A-1. The regulation allows a facility to requ est a lower provisional GWP when clear scientific evidence exists to support such a lower value. Table A–1 does not list a GWP for perfluoromethyl m orpholine (PMM). As described in greater detail in a subsequent section, the atmosph eric lifetime of perfluoromethyl morpholine has been estimated as 1600 years [3, 4]; the radiative forcing of perfluoromethyl morpholine has been estimated [3, 4] and using thes e data, the GWP of perfluoromethyl morpholine has been estimated as 9500 relative to C O 2 with a 100-year integration time horizon.

Evidence Supporting Request: F-GHG Identity: perfluoromethyl morpholine (PMM)

Chemical Formula: C 5 F 11 NO

CAS Number: 382-28-5

Estimated GWP: 9500 relative to CO 2 with a 100-year integration time horizon Data and analysis: Radiative forcing: Band by band absorption cross-se ctions were obtained from averaged IR spectra. Radiative forcing was calculated by the c onsultant using an internal model (AER 1- D RC) [3] and used to calculate a direct, equilibri um surface temperature response ( ∆ T) assuming a 1 ppbV introduction. The corresponding value relative to CFC-11 on a permolecule basis was reported as 0.27/0.15 = 1.8. In AR4 the radiative forcing of CFC-11 is reported as 0.25 W/m2/ppbV. The radiative forcing for PMM is therefore 1.8 × 0.25 = 0.45 W/m2/ppbV. Atmospheric lifetime: The atmospheric lifetime for PMM was derived from kinetic data reported by Ko [3]. Ko reported lower limits of at mospheric lifetime due to reaction with hydroxyl radical and O(1D) oxygen. These lower lim its were used to estimate a totalatmospheric lifetime of >1600 years. This value wa s used as a minimum value in GWP

calculations. Using these data in the equation referenced by the IPCC [4] to determine the GWP of a given substance, a GWP of 9500 relative to CO 2 with a 100-year integration time horizon was established.

1. "Mandatory Reporting of Greenhouse Gases: Additiona l Sources of Fluorinated GHGs; Final Rule" , Federal Register 75:230 (December 1, 2010) p.7477 4.

2. "Table A-1 to Subpart A of Part 98—Global Warming P otentials" : Table A-1 in 40 CFR part 98, subpart A. 3. Ko, M.K.W. and D.T. Chang, Estimates of the Global Warming Potential of Propos ed Chemical Compounds. 1992, Atmospheric and Environmental Research, Inc. : Cambridge, MA. 4. IPCC, 2007: Climate Change 2007: Impacts, Adapt ation and Vulnerability. Contribution of Working Group II to the Fourth Assessment. Repor t of the Intergovernmental Panel on Climate Change, M.L. Parry, O.F. Canziani, J.P. Pal utikof, P.J. van der Linden and C.E. Hanson, Eds., Cambridge University Press, Cambridge , UK, 976pp.