1

T e c h n i c a l Memorandum

Date: March 3 0 , 2011

Subject: Summary of U.S. EPA Discussions with Zeon Chemicals L.P. Representatives to

Discuss the Polymers and Resins I Portion of the 2 0 10 RTR Proposal/Supplemental Proposal

F r o m : N i c k P a r s o n s

, E P A / O A R / O A Q P S / S P P D / R C G

The purpose of this memorandum is to summarize a series of discussions between

representatives of the U.S. Environmental Protection Agency (EPA) and Ze o n Chemicals L.P.

The topic of these discussions was the proposed revisions to the National Emission Standards for

Hazard Air Pollutants (NESHAP) for Po lymers and Resins I (40 CFR p a r t 63, subpart U),

specifically for the Epichlorohydrin and Nitrile Butadiene Rubber P roduction source categories.

Participants

Nick Parsons, U.S. EPA

Tom Herman, Zeon Chemicals

Bill Simpson, Zeon Chemicals

Dates of Discussions

J anuary 21, 2011

January 28, 2011

January 31, 2011

March 4, 2011

Summary of Discussions

The purpose of these meetings was to discuss Zeon Chemical s ’ comments on the October

21, 2010 proposal/supplemental proposal for several source categories, including the

Epichlorohydrin E l a s t o m e r and Nitrile Butadiene Rubber ( N B R ) Production source categories of

the Polym ers and Resins I MACT (75 FR 65068).

Zeon Chemical s representatives presented their concerns with the proposed requirements

for the Epichlorohydrin and Nitrile Butadiene Rubber production source categories. The key

issue of concern for the company was that the proposed back

- end emission limits for the source

categories did not take into account process variability ( i

. e

. , d i f f e r e n t p r o d u c t m i x e s ) t h a t w o u l d

l e a d t o v a r y i n g l e v e l s o f o r g a n i c H A P e m i s s i o n s p e r a m o u n t o f elastomer p r o d u c e d

.

Based on these discussions, Zeon Chemical s submitted additional process and production

information to be considered in setting the back

- end emis sion limit

, i n c l u d i n g s e v e r a l years o f2

h i s t o r i c a l e m i s s i o n s f

o r t h e i r N B R p l a n t

. W h i l e t h i s t yp e o f i n f o r m a t i o n s h o w i n g e m i s s i o n s

v a r i a b i l i t y d u e t o v a r i e d p r o d u c t m i x w a s n o t a v a i l a b l e f o r t h e i r E p i c h l o r o h y d r i n E l a s t o m e r p l a n t

,

Z e o n C h e m i c a l s r e p r e s e n t a t i v e s p r o v i d e d t h e f o l l o w i n g r a t i o n a l e f

o r w h y i t w a s a p p r o p r i a t e t o

i n c o rp o r a t e t h e v a r i a b i l i t y f r o m t h e N B R p l a n t i n s e t t i n g t h e M A C T f l o o r l i m i t f

o r t h e

E p i c h l o r o h y d r i n E l a s t o m e r s s o u r c e c a t e g o r y :

The processes which contribute to the majority of the back

- end emissions are very

comparable between the KY Plant NBR and MS Plant ECO (Epi) manufacturing

operations. The two ECO drying processes at the MS Plant are apron

- type dryers, where

heated air is p assed over and through the wet crumb rubber as it passes down through an

oven

- like chamber on a moving perforated stainless steel apron conveyor. The two main

NBR drying processes at the KY Plant are also apron dryers. As product mix varies, so

can residua l monomer and/or residual solvent vary and, as a result, so can HAP

emissions vary. Recent product mix variability has not been as great at the MS Plant as it

has at the KY Plant. Nevertheless, the potential for variability is there at the MS Plant.

To off set this lack of recent data to represent the MS Plant and its ECO manufacturing

variability, we propose to use the same variability factor for ECO manufacturing as has

been developed for NBR manufacturing.

E P A a g r e e d w i t h Z e o n C h e m i c a l s r a t i o n a l e t h a t the b a c k

- e n d p r o c e s s e s f r o m t h e N B R

p l a n t a r e s i m i l a r t o t h e E p i c h o l o r h y d r i n p l a n t

, a n d i n c o rp o r a t e d t h e s a m e e m i s s i o n s v a r i a b i l i t y

f a c t o r i n s e t t i n g the M A C T f l o o r f o r b o t h t h e N B R a n d E p i c h l o r o h y d r i n s o u r c e c a t e g o r i e s

.3 Appendix

Supplemental Emissions Information4 

## Zeon Chemicals L.P.

Kentucky Plant

MACT Polymers & Resins I (Subpart U) Back

- End Emissions

Nitrile Butadiene Rubber Production

114 Questionnaire Supplemental Information

Year Back

- End

1,3

- B utadiene

Emissions (TPY) Back

- End

Acrylonitrile

Emissions (TPY) Nitrile Rubber

Production (TPY) Nitrile Latex

(dry basis)

Production (TPY)

2005 3.489 12.18 Confidential Confidential

2006 2.625 11.92 “ “

2007 2.796 11.50 “ “

2008 0.547 4.046 “ “

2009 0.308 1.454 “ “

The above emissions were totaled from the following Emission Release Point ID’s, ordered by

appearance on the 114 Questionnaire response spreadsheet:

BT3134 BT3537 DRYNCW PBL2 PBL3 PBL5

SD1BLT SD2BLT SDR1SD T45678 BT3839 PBL1

PBL6 S DNDR2 SDR2SD SD2RTO BT1920 BT2126