CS-109 Determination of Anhydrides Derived from Dimethylbenzoic

CS-109 Determination of Anhydrides Derived from Dimethylbenzoic Acids. D E. Nicholson. Anal. Chem. , 1959, 31 (12), pp 2108–2108. DOI: 10.1021/ ...
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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

3 ~ 0 . 51 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-