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             Calculating N2O Emissions from the Production of Adipic Acid
             Calculation worksheets. December Version 2.0

             Purpose and domain of application

             This guideline is written for plant managers and site personnel to facilitate the measurement and
             reporting of greenhouse gas direct emissions resulting from adipic acid production. A step-by-step
             approach is presented to cover every phase of the calculation process from data gathering to reporting.
             This sector guideline should be applied by the industries whose operations involve the production of
             adipic acid. This document is to be used in conjunction with two additional documents:
             1) ‘Guide to calculation worksheets – Calculating N2O emissions from the production of Adipic Acid, and
             2) ‘GHG Protocol Reporting Standard and Guidance’.

             Process Description and Assumptions

             The primary use of adipic acid is in the manufacturing of 6,6 nylon. Cyclohexane is used to produce a
             ketone-alcohol, which is subsequently oxidized with nitric acid to produce adipic acid. Nitrous oxide (N2
             O) is produced as a by-product of this reaction, with an associated emission factor of 300 g N2O /kg
             Adipic acid produced. This emission factor does not incorporate any reductions associated with
             abatement technologies.

             N2O emissions can be abated by:
             (1) Treating the off-gases in a reductive furnace.
             (2) Thermally decomposing the N2O in a flame reactor (T>900 C) to produce recyclable NO.
             (3) Catalytically decomposing the N2O.
             (4) Consuming the N2O as an oxidation process feedstock.

             The majority of the large adipic acid producers (representing more than 80% of worldwide capacity in
             2000) currently treat N2O emissions.



             Greenhouse gases are also emitted from the fuel combustion process associated with adipic acid
             production. These emissions are not accounted for the guidelines described below. Please see the
             Stationary Combustion guidelines for more details and for the methodology used to estimate these
             emissions.
The intellectual property rights of this calculation tool belong to WRI and WBCSD, unless stated otherwise in any of the tools.
Please cite the original reference when using this tool.


      Direct emissions
      Direct emissions are emissions from sources that are owned or controlled by the reporting entity.

      To calculate direct N2O emissions use Worksheet 1 - DirectEmissions

      You will need to determine the following:
                 Adipic Acid Production (tonnes)
                 Emission Factor (tonnes of N2O/tonnes of adipic acid produced)
                 Fraction Abated (%) – percent of emissions abated by reduction technologies and practices
                 Utilization Factor (%) – percent of time abatement technology was in use

      Default values are provided for the following:
                  Emission Factor (metric tons of N2O/metric ton of adipic acid produced)
                  Fraction Abated (%) – percent of emissions abated by reduction technologies and practices

      Clearly state in the final report if different values than the default factors are used,
      including their source.

      Calculation Steps

              1.1. Enter the amount of adipic acid produced (tonnes) during the
                     reporting period in Column A.
              1.2. Enter the N2O emissions factor (metric tons of N2O /metric ton of adipic acid produced) in Column B. This
                   emission factor should not incorporate any abatement technologies. A default value of 0.3 is provided by
                   IPCC (1996) in Table 1 of Worksheet 1.
              1.3. Calculate N2O emissions by multiplying the amount of adipic acid produced by the N2O emissions factor
                   (Columns A and B). Column C should now display the product of A and B. If this is not the case, press “F9”
                   to calculate.



                   If the facility uses N2O abatement technologies, please follow steps 2.1 through 2.4. Otherwise,
                   please skip to Step 2.5
               2.1 Enter the type of N2O abatement technology in Column A.
               2.2 Enter the percent of N2O that is abated through reduction technologies in Column B. These pollution
                   controls must be specific to reducing N2O emissions.
               2.3 Enter the utilization factor for the N2O abatement technology in terms of the percent of time that technology
                   was used (Column C).
               2.4
                   Estimate N2O emissions by multiplying the potential annual N2O emissions calculated in Step 1 above by
                   one minus the N2O abatement factor (Column B) times the utilization factor (Column C).
               2.5 Please enter the Global Warming Potential (GWP) for N2O in Column D. Currently, the GWP for N2O over a
                   100-year time horizon is 310.
               2.6 Calculate Carbon Dioxide Equivalents by multiplying the potential annual N2O emissions (Column E) by the
                   GWP of N2O (Column F)

      Remember to calculate CO2 emissions from fuel use associated with adipic acid production
      on the Fuel Combustion protocol.
The intellectual property rights of this calculation tool belong to WRI and WBCSD, unless stated otherwise in any of the tools.
Please cite the orginal reference when using this tool.


Cell color code:
Mandatory user entry:
Optional user entry:
Default value:
Auto calculated value:


                            WORSKSHEET 1: Determine Direct Annual Gross Nitrous Oxide Emissions from Adipic Acid Production
                                    Step 1.1              Step 1.2                 Step 1.3
                                        A                      B                       C
                             Annual Adipic             Nitrous Oxide         Potential Annual
                            Acid Production               Emissions           Nitrous Oxide
                              (tonnes/yr)                  Factor               Emissions
                                                        (tonnes N2O/            (tonnes/yr)
                                                       tonnes adipic
                                                            acid)
                                                         See Default                 AxB
                                                                                                 -

                                    Step 2.1              Step 2.2                 Step 2.3                                            Step 2.4             2.5              2.6
                                        A                      B                       C                           D                      E                  F                G
                                N2O Abatement N2O Destruction                 N2O Abatement              Potential Annual           Annual Nitrous         Global      Annual Carbon
                                 Technology       factor                        Technology                 Nitrous Oxide           Oxide Emissions        Warming          Dioxide
                                    Name            (%)                      Utilization Factor              Emissions              (tonnes N2O/yr)       Potential     Equivalents of
                                                                                     (%)                  (tonnes N2O/yr)                               (tonnes CO2/    Nitrous Oxide
                                                                                                                                                        tonnes N2O)       Emissions
                                                                                                                                                                       (t CO2-Equiv./yr)
                                                        See Defaults             See Defaults           Result from Step 1         D x [1 - (B x C)]                         ExF
                                                                                                                 0                         0                310                0

                            Table 1: Default Values            ¶

                                                                                                          Default value                Range
                            Emissions Factors
                            Nitrous Oxide Emissions Factor (t N2O/t adipic acid)                                            0.30          0.27 - 0.33

                            N2O Destruction Factors: by Technology*:
                            None                                                                                            0%                   N/A
                            Catalytic Destruction                                                                       92.50%                90-95%
                            Thermal Destruction                                                                         99.00%                98-99%
                            Recycle to Nitric Acid                                                                      99.00%                98-99%
                            Recycle to feedstock for Adipic acid                                                        94.00%                90-98%

                            N2O Abatement Utilization factors: by Technology*:
                            Catalytic Destruction                                                                       89.00%                80-98%
                            Thermal Destruction                                                                         97.00%                95-99%
                            Recycle to Nitric Acid                                                                      94.00%                90-98%
                            Recycle to feedstock for Adipic acid                                                        89.00%                80-98%

                            Nitrous Oxide Global Warming Potential                                                           310


                            ¶
                                , Source: 2006 IPCC Guidelines for Natinal Greenhouse Gas Inventories
The intellectual property rights of this calculation tool belong to WRI and WBCSD, unless stated otherwise in any of the tools.
Please cite the original reference when using this tool.



             Calculating N2O Emissions from the
             Production of Adipic Acid
             Calculation worksheets.
             Version 1.1 - September 2004
             Rectified formula error in cell F23. The correct value is F23=E17.

             Version 2.0- December 2007
             Updated the emission factors to reflect new guidance issued by the IPCC in its 2006 Guidelines.
wise in any of the tools.




its 2006 Guidelines.

								
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