Determination of Hydroxybenzoic Acids
Determination of Isomeric Cymenes
D. E.
NICHOLSON Humble O i l 8, Refining Co., Baytown, Tex.
CS- 140
D. E. NICHOLSON Humble O i l 8, Refining Co., Baytown, l e x . I
I
No.1
1
Name
,
Formula
%
~
10.4 p-Cymene
'
CloH14
~
-
Sllt
I
~
Concn.
(mml 1 0 0 ml AX o r I g /lengfh
X Bor1 v
Accuracy
Componenf
Av
Pfr.
mm
1 12.78 i' 0.680 1 1 0 . 0 6 0 ~ 1.005 I
1
0-100
_
I
_
f0.4 12.28 0.550
i. 005
~
_ h0.4
0.050p
- ~ _ _ 13.21 0.720 1 0 . 0 6 3 ~ 1.005 ~
0 . 0 4 9 ~ 0.1
benzoic
Inrfrumenf: Perkin-Elmer M o d e l 1 12, NaCl prism Sample Phase: Solution in carbon disulfide Cell Windows: NoCI Absorbance Mearuremenh
Cell Windows: NaCl Absorbance Measurement: Colculafion:
Colculafion: Base line-
Inverse m a t r i r Graphicol-
Inverse m a t r i r Grophical-
P o i n t X
1
2 1
2 3 Material Purity:
13.27~ 0.0064 0.0154 0.0065
Successive a p p r 0 x . X
12.78~ 1.519 0.019 0.022
Componenf/A
11.65~ 0.0127 0.0031 0.0032
P o i n t X
Relative Absorbances-Analyficol Mafrix:
Successive 0 p p r o x . X
Relofive Absorbances-Analyfical Matrix: Component/k
Bore line-
12.9611 0.0057 0.0055 0.0234
98%.
3 Maferial Purity:
12.28~ 0.019 1.819 0.011
13.21~ 0.016 0.009 2.239
99.8%.
Comments: In a plot o f absorbance vs. absorptivity, the largest devia. tions exist for o-cymene-the absorptivity chonges 1.3y0f o r 0.100-increment in absorbance.
Determination of CpAlkylbenzenes 5. H. HASTINGS and D. E. NICHOLSON Humble Oil 8 Refining Co., Baytown, l e x .
CS-141 Inrfrumenf: Perkin-Elmer Model 1 1 2, NaCl prism Sample Phase: Solution in carbon disulfide
1
2
sec-Butylbenzene
4
~
~
Hemimellitene
3 /p-cymene
-I
-__ CloH14 0-100
1
C10H14 ~
lndan
l-l--.-..---
1 2 0 . 5 I 13.18
~ 1 0 . 5 13.04
CgHl?
I
1
CgHlo
Cell Windows: NaCI Absorbance Measuremenf:
~
I
0-100
1 0-100
10.5
' ,
12.28
10.5
13.33 I
~
0.720 1 1 0 . 0 6 3 ~ 1.005 ~ _ 0.720 ' 1 0 . 0 6 4 ~ 1.005
11
0.550 1 0 . 0 5 0 , ~ 1.005 0.800 1 0 . 0 7 1 ~I 1.005
These d a t a represent standard publication and submission is open t o anyone in accordance with regulations of AXALYTICALC H E M I S T R YT. h e Coblents Society is acting only as a n aid t o t h e journal.
Colculafion:
_
Base line-
Inverse m a t r i d Graphical-
P o i n t L Successive approx.--
-
~
~
Relative Absorbances-Analytical Motrix: Component/X 1
2
3
4 Maferiol Purity:
13.21~ 1.084 0.017 0.263 0.009
13.04~ 0.037 2.084 0.020 0.128
12.28~ 0.019 0.017 1.819 0.023
13.33~ 0.012 0.072 0.008 1.507
99.8yC.
T o standardize procedure, AS.ALYTICAL C H E M I S T Rrequests Y t h a t material be sent in quintuplicate t o t h e chairman of the review committee: D. E . Nicholson, Research and Development Division. Humble Oil & Refining Go ,, P. 0. Box 3950, Baytown, Tex.
VOL. 32, NO. 11, OCTOBER 1 9 6 0
1533
