Do you mean you want to substitute these BTEX components with paraffinic equivalents (based on their identical carbon number) to make the compositional analyses comparable? What parameters of the streams do you want to compare?
Junior Member
Do you mean you want to substitute these BTEX components with paraffinic equivalents (based on their identical carbon number) to make the compositional analyses comparable? What parameters of the streams do you want to compare?
Junior Member
In the GC composition, C7 would represent all isomers including nC7. This is true for other Carbon Numbers as well. I have cryogenic flash composition data for some samples and they have BTEX compositions. Standard Single Stage Flash (SSF) composition for other samples doesn't include these BTEX composition. They have been reported as C7 total, C8 total...
So when I have to compare different samples to understand compositional variation, they have different composition scheme. I just proposed the above composition to make two different sets of compositions to have a unified composition scheme.
I would like to know whether I need to follow some other procedure.
Junior Member
In the GC composition, C7 would represent all isomers including nC7. This is true for other Carbon Numbers as well. I have cryogenic flash composition data for some samples and they have BTEX compositions. Standard Single Stage Flash (SSF) composition for other samples doesn't include these BTEX composition. They have been reported as C7 total, C8 total...
So when I have to compare different samples to understand compositional variation, they have different composition scheme. I just proposed the above composition to make two different sets of compositions to have a unified composition scheme.
I would like to know whether I need to follow some other procedure.
Junior Member
Solution-
CN is defined on boiling point criteria. Following are the boiling point range for C7, C8 and C9 (ref:Phase Behaviour of Petroleum Reservoir Fluids-Pederson)
from table 2.1
C7: 69.2-98.9 (degC)
C8: 98.8-126.1 (deg C)
C9: 126.1-151.3 (deg C)
and boling point for Benzene, Toulene, Ethyl Benzene, O/M/P-Xylene are as (ref: table 2.2- PEDERSON)
Benzene: 80.2 (deg C)
Toulene: 110.7 (deg C)
Ethyl Benzene: 136 (deg C) (source-Wikipedia)
m+p-Xylene: 138.8 (deg C)
o-Xylene: 144.5 (deg C)
So accordingly Benzene can be added to C7, Toulene to C8 and Ethyl Benzene, O/M/P-Xylene to C9.
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