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CLENTF-AL
CHXRACT ERISATION OF ACTIVE CX-MNS: PART 11
REEPoFri NO. RD.461-E
2) 3.1 OA7.
'IROj'_
-7 :37: 3400
ATJT',Ii'OR: Yxs. S.L. Vekris
-S,Tiz7:-,) BY: 1.W. Hughes
-;.S.:-'. "Hobson, Esq. Copy No.
~r Charles ---"-!is
S 1 2
Dr. S.J. Green 3
Dr. R.B. Griffith 4,- 5, 6
AIX. Lapome, Esq. H 11
7,
8, 9
W.W. Reid, Esq. 10, 11
Herrn E.H. S8ring 12, 13, 14
E.C. Fieldsend, Esq. 15, 16, 1T
R. & D.E. Library 18, 19
R. & D.E. File No. 46B-11 20
Co-.- 'No: -as
PIL-ca
BATCo document for Province of BritiSh Columbia 9
November 1999


Research & Development Establis~=,ent,
British-A.merican Tobacco Co. Ltd.,
SOUTHAJV2TON.
sr-y/~-ac/46B-11 2rd March, 1967.
CHAR ACTERIS K.'LION OF ACTIVE CARBONS: PAIK II
(Report No. RD.461-R)
S*,;,';:.'-.RY AJ%M CONCLUSIONS
Adsorption isotherms of five substances on various
active carbons were measured
For each carbon, adsorption. capacities and
surface areas were calculated.
An attempt was made to correlate adsorption
properties with cigarette smoke
filtration efficiencies for the same substance on
the same carbon. There was no
direc-:~ relationship between any single
adsorption parameter and the filtration
effic-4ency. Thus it was concluded that the
presence of other smoke components
affe---.s *the filtration of any single component.
Two factors may contribute to
this effect:
(1) Multicomponent physical adsorption: The
adsorption of any smoke component
is strorZly influenced by the physical adsorption
of other components. Thle
multicomponent adsorption theory of Vyers and
Prausnitz (5) leads to prediction
of selective adsorption from mixtures of hydrogen
sulphide and ace-~Aidehyde
which are in qualitative agreement with filtration
efficiencies measured
using cigarette smoke.
(2) Chemical reaction between smoke components on
the darbon surface: For
example, hydrogen sulphide reacts with. air to
produce elemental sulphurr on zhe
surface of carbon.
P6 xther work is planned to investigate these two
effects in more detail. in
LP
order to achie--e a better understanding of the
selective filtration obtainable -j
with carbon, and with the ultimate aim of
designing filters with specific selective+
proper-,11es.
BATCo document for Province of British Columbia 9
November 1999