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i/U>~ti*- oo: Dr. GrahamEdigar ETHYL CORPORATION RESEARCH LABORATORIES 1 6 0 0 W EST EIGHT MILE ROAD FERN DALE DET ROIT , MICHIGAN 20, Feb r u ar y 1 2 , 1944 D r , R o b e r t A . Kehoe Co lle ge o f Med icin e Un ive r s ity o f Cin cin n a ti Ed e n Aven u e Cin c in n a t i 1 9 , Ohio De a r Bob : With r e fe r e n c e t o t h e e v a p o r a t io n o f g a s o lin e con t a in in g t e t r a e t h y lle a d , I am s e n d in g yo u h e r e w it h a b r i e f memorandum and t w o g r a p h s . As i n d i c a t e d in t h e memorandum, t h e fig u r e s a r e c o n s id e r e d q u it e r e l i a b l e up t o 90% e v a p o r a t i o n , b e yon d t h a t i t seem s l i k e l y t h a t t h e p r e s e n c e o f CS w ou ld a ffe c t the shape o f the cu r ve , I s h a ll b e g la d t o h e a r fr om yo u r e g a r d in g w h e t h e r t h is is a ll you need a t th e p r e se n t, or whether you have any s u g g e s t io n s a s t o some e xp e r im e n t a l work i n t h e fie ld C:C En e l, 0002354 Memorandum t o : D r . H .A. B e a t t y February 2 , 1944 EVAPORATION OF LEADED FUELS The a t t a c h e d tw o cu r v e s h e e t s show t h e d i s t r i b u t i o n o f t e t r a e t h y l le a d in th e e va p o r a tio n o f th r e e le a d e d g a s o lin e s : ( a ) Army A l l P u r p o s e 8 0 -Qct a n e G a s o li n e , Type A , 3 c c . T E L/ g a l. ( b ) Army A l l P u r p o s e 8 0 -0 c t a n e G a s o li n e , Typ e C ( A r c t i c ) 3 c c . T E L/ g a l. ( c ) A t y p ic a l 1 0 0 -0 ct a n e Av ia t io n F u e l, 4 .6 c c . T E L/ g a l. The r e s u lt s a r e shown a s p e r ce n t o f t h e t o t a l le a d e v a p o r a t e d a t t h e c o r r e s p o n d in g p e r ce n t a ge o f t h e fu e l e v a p o r a t e d , and a ls o as grams Pb p e r 10 c u . m . fu e l va p o r fo r th e fu e l v a p o r iz e d . The c a lc u la t io n s were made u s in g th e same m o le c u la r volum e v s . b o i li n g p o in t c o r r e la t io n u s e d s u c c e s s fu lly in s im ila r c a l c u l a t i o n s i n LTD 3 9 -2 1 and LTD 4 1 -5 3 fo r t h e p r e d i c t io n o f t h e d i s t r i b u t i o n o f le a d a l k y l s . The o ld cu r v e for Re d Crown g a s .o lin e shown fo r co m p a r is o n i s b a s e d on t h e e x p e r im e n t a l m e a s u r e m e n t s i n LTD 3 9 -2 1 . . Vih ile some e x p e r im e n t a l w or k may be d e s ir a b le t o ch e ck t h e c a l c u l a t i o n s i t is n ot b e lie v e d t h a t th e e r r o r w ill be gr e a te r th an t h a t cor r esp on d in g to -Z% i n t h e volu m e p e r c e n t o ve r fo r t h e d i s t r i b u t i o n o f t h e l e a d . The r e s u lt s fo r t h e c o n c e n t r a t io n o f t h e le a d i n t h e v a p o r a r e i n much g r e a t e r d o u b t b e ca u s e o f t h e u n c e r t a in t y in t h e m o le cu la r volu m es a ssu m e d . A d is c u s s io n w it h Dr . Keh oe i s i n o r d e r b e fo r e m or e c a l c u l a t i o n s a r e d on e o r e ve n a t e n t a t i v e e x p e r i m en tal program is la id o u t . The e f f e c t o f a d d in g a s m a ll am ount (u p t o 5%) of CS t o t h e g a s o lin e w i l l h a ve p r a c t i c a l l y no e f f e c t on th e r e s u lt s a t l e a s t up t o t h e 90% e v a p o r a t e d p o in t. Ge o r ge W. Thomson T :0 K 0002957