Determination of 1,3- and 1,CDimethylbenzenes in Benzonitrile
Determination of Anhydrides Derived from Dimethylbenzoic Acids
D. E. NICHOLSON a n d S. H. HASTINGS, Humble O i l 8 Refining Co., Baytown, l e x . CS-108
D. E. NICHOLSON, Humble O i l 8 Refining Co., Bayfown, Tex.
Componenf Name Formula
-I
i
1
Benzonitrile
2
i
1~ j yo
No./
1,3-Dimethylbenzene
1 ~
Ronge
CiHbN 10-100
1
0-100
CsHlo
1,4-Dimethyl- I-CgHlo 10-100 1 benzene
3
Concn. g/lifer length
Slit
X or v
Accuracy
7,
1
IhO.5
I
0.1. Pts.
h0.5
~
'
(mml
AX o r Av
mm --
-I
1 1 .oo
4 . 4 6 ~10.100 0.021p
Calculation:
-1
1 2,5-Dimethylbenzoic anhydride
1
1 1 1 . 4 2 ~ 0.550 1 0 . 0 5 2 ~ 1 .oo
1
h O . 5 1 1 2 . 5 9 ~10.630 0 . 0 5 7 ~I 1 1.00
~
~
Base line-
Inverse m a t r i x Graphical-
benzoic anhydride
3 3,5-Dimethylbenzoic anhydride
Instrument: Perkin-Elmer M o d e l 11 2, NaCl prism Sample Phase: Solution in carbon disulflde Cell Windows: NaCl Absorbance Measurement:
no.^
Matrix:
11.42~ 0.000 0.020 0.001
0.031 0.000 0.000
1 2
3 Material Purity:
racy
X or v
(mm)
8.1.
AX or
gllifer length
Pts.
Av
mm
~ C1gH1803 0-100 1 1 . 5 8 . 0 6 ~0.095
1 0 . 0 2 6 ~ 0.100
1 1
0-100
1
1
1 1 . 5 12. lop 0.213 1 0 , 0 4 1 ~0.100
I ~~
C18HI8O3 0 - i o o l f 1 . 5
Cell Windows: NaCl Absorbance Measuremenf:
Successive a p p r o x L
4.46~
Component/X
'
% I %
Range
1 3 . 3 2 ~0.290 1 0 . 0 5 4 ~ 0.100
Instrument: Perkin-Elmer Model 1 12, NaCl prism Sample Phase: Solution in carbon disulfide
P o i n t X
Calculation: Relative Absorbances-Analytical
1 Accu-
Component -~ Name Formula
CS-109
12.59~ 0.002 0.002 0.278
P o i n t X
Inverse matrixGraphical-
Successive a p p r 0 x . X
Relative AbsorbancerAnalyfical Matrix:
8.06~ 0.159 0.028 0.007
Component/X 1 2 3
1,3- and 1,I-dirnethylbenzenes, 99.5%; benzonitrile,
98%
Base line-
13.32~ 0.020 0.001 0.119
12.10p 0.015 0.041 0.010
99%
Maferial Purify:
Determination of Isomeric Ca Alkylbenzenes 5. H. HASTINGS and D. E. NICHOLSON Humble Oil 8 Reflnfng Co., Baytown, l e x .
cs-110 Slif
-1
1
2
1
i
Range
h0.7
1,3,5-Trimethylbenzene
_
1
f0.7
4 1 1-Methyl1 4-ethylbenzene
CgHi?
1
1 0.100
_ ~ 1 6 . 9 8 ~ 0.238 1 I 0.100
2-ethylbenzene Con12
,
1 9 . 4 0 ~ 0.323 ~
1 -Methyl3-ethylbenzene
3
mm
~
1 1-Methyl-
-
Av
(mm)
Componl f Name
No. '
AA o r
Concn. g/liter length
1 0-100
f0.7
1
2 2 . 8 0 ~ 0.520
~
Determination of Isomeric Methyl Benzyl Benzoates cs-1 11
D. E. NICHOLSON, Humble Oil 8 Refining Ca., Baytown, Tex.
Component Name
No. -
Range
Accuracy
%
%
1
1 2,5-Dimethyl- C1gH2~07 0-100 benzyl-2,5-1 dimethyl benzoate
1-
1 0.100 ~
~
3,5-Dimethyl- 1 ClsH?oO? 0-100 benzyI-2,4-' dimethyl benzoate
or v
B.I.
AX or
Pts.
AV
I ~
length mm
1 1
12.80~10.250 1 1 0 . 0 4 7 ~ 0.027
h1
1 2 . 9 8 ~0.262 1 1 0 . 0 4 8 ~ 0.027
I
i
X
~~
~
1
~
-I-
0.290 1-1 1 0.100
0-100
1
Instrument: Perkin-Elmer Model 1 12, CsBr prism Sample Phase: Solution in carbon tetrachloride Cell Windows: CsBr Absorbance Measuremenf:
Base line-
P o i n t X
Inverse matrix-Successive a p p r 0 x . X GraphicalRelative AbsorbanceiAnalyticaI Matrix:
1
2 3
4 Material Purity:
2108
19.40~ 0.284 0.054 0.054 0.110 99.9%
ANALYTICAL CHEMISTRY
16.98~ 0.029 0.356 0.076 0.069
~
Instrumenf: Perkin-Elmer Model 2 1, NaCl prism Sample Phase: Solution in carbon disulflde
Calculation:
Component/X
1 13.061.1 0.263 0.049p, 0.027
3 '2,d-Dimethyl- ClsH?aOz 0-100 benzyl-3,5.' ' dimethyl 1 1 benzoate 1
22.80~ 0.023 0.460 2.060 0.099
18.58~ 0.037 0.073 0.044 3.200
Cell Windows: NaCl Absorbance Measurement: Graphical-
Base line-
P o i n t X
Relative Absorbances-Analytical Mafrix: Component/X
1 2 3 Material Purity:
12.80~ 0.0152 0.0033 0.0059
12.98~ 0.0027 0.0285 0.0070
Minimum purity of 98 wt. ponents
13.06~ 0.0020 0.0090 0.0220
% of each of the three
com-
