Document e5m6JrbNnywKJZn7ekNmMdQgp

r?i p mHrm-nTusrMT H. M. O'Hars/C. JtflOneaeh J___ AC________ April 28, 1973 ntocmi on pvc mqoklzng srorr: pant 3 PINAL CHECK-OUT OP Tffi SYSTEM BFG TECHNICAL DOCUMENT Ht kaw shewn that a serious VCM diffusion problaa exists la our modeling system. This problaa prohibited us froa asking roal tlaa acasursasnta of VCM diffusion froa PVC nsia. In-depth coosultstlon with thoso sort versed with vis diffusion problsan (Serene, Daniels, Kla) has rasultad la rapid solution to the problaa. Ho caa aw axperlaentally duplicate tha thaoiationl diffusion of VCM la tha 33-gallon druas which will ba used in this study. This development rnnowas tha final concerns wa had about VCM absorption. Final experlaental nodlficatlons ware aada on A/24/73: nodelino studies will begin on 4/28/73 sad will taka approximately 2-3 weeks to ecaplete. Introduction Xa Pert 2 of this series, wa described a series of experimental probleas that had cropped up sad have bean subsequently solved. Ia Part 1* we described a aathnaatlcal nodal that wna dawsloped to predict tha build-up of VCM la a 33-pllau drua. Initial indications warn that wa could saporiaantally duplicate tin uathaaatieal aodal. however, aubsequent work on our systaa indicated tha presence of a anxious problaa. Figaro 1 shews tha theoretical build-up of VCM ia a 33-^llca drua whan a 1 ppa (1000 ppb) VCM ia air mixture ia flowed into tha drua at 1.88 litars/aianta (aaa Appendix far the derivation of tin aathese Ural aadal). Included ia this figure is the sxperlasatal carve obtalaad bp gM chroaatographle sa^lleg of the dnaa. It caa ba aaaa that tha sap erfneats! carve ia displaced significantly free the theoretical carve. Mawtar far aap concentration, tha two curves era displaced exactly 48 mlnates. This aaggaatad either a dlffnalea problaa or aa abaorptioa problaa. ha aheeb this out wa aouatad a snail 3-inch fsn fa the Am md waited the VmtsfNMt. lipn 2 indicates hm mil this 25241001 M. K. 0*Nsre BFG39444 25241003 t lM I U O O A fttfM M 'C 4C 9 1 3 3 Arnwa Dariuatioo of tha 4fnati4l equation Cor thia problea via carried out by I. Kla: C0 - concentration of Incoming air atraaa (lppa) Ct eooeantration la drua at aoy tiaa (t) ? volona of drua a floa into aad oat of dnaa t- aC, ft aCfdt dc d/dt - -Ca'-C* Is ,, dt " At <P - aAr dt .4K' S ^-Jf u *V&- Cj) aAr (t) A . - l, - A . 0, O- A ptifiaa aw written far thU aquation at* tfca fallawlnt pradicfead Ml enlace dataradaad. f a IU tfttm, C, l n, 25241004 BFG39445 (Mlawtes) 10 20 30 40 30 60 70 90 -1 - Theoretical (nob) 81 1S5 223 288 344 397 446 531 Found 77 169 244 309 378 429 484 576 Ann data an plotted in figure 2. While than la an obvious upward bias la tha experlmatal data Tl) this la aaaa as a possible error in the How rate or la the precise aoaeet of settles t - 0 oa the stopwatch, ewertheless, the data correlate salts satisfactorily sad Indicate ao nal problems (dlffualoe, absorption, teabags) la saa^llng. Im rr A. *. 0. tstwsprls K. V. taaashlll A. L. Tools cay 41340 BFG39446