5. Function Tools
60
5-2-1.Preparation of reagent
Prepare the reagents and samples for measurement of bromine number and bromine index.
<
Preparation of reagent
>
Use the following reagent for measurement of bromine number or index:
Anode reagent
：
Mixture of Acetic acid (high grade) 600mL; Methanol (high grade) 260mL;
1M-Potassium bromide solution 140mL. Blend it well and use
100mL each time.
Cathode reagent
：
0.2M-Potassium chloride solution. Use 5mL each time.
Check solution
：
0.05Wt-Cyclohexene
toluene mixture (Approx. 93 ~
102mgBr
2
/100g). Theoretical value is calculated by the below
formula:
1000
g
e
cyclohexen
g
toluene
100
mass
molecular
e
cyclohexen
82.15
g
e
cyclohexen
mass
molecular
bromine
159.83
/100g)
Br
(mg
value
l
Theoretica
2
u
u
u
）
（
）
（
< Prepare reagent >
Refer to the below chart for sample size:
Bromine index
(mg/100g)
Sample size (g)
Below 10
10 ~ 15
10 ~ 50
5 ~ 10
50 ~ 100
3 ~ 5
100 ~ 200
1 ~ 3
More than 200
~ 1
For bromine number, a sample is diluted with toluene to Bromine number 0.2 (g/100g),
and approximately 1g is used for measurement. Calculate the toluene to be used for
diluting to Bromine number 0.2 (g/100g) with the following equation:
/100g)
0.2(gBr
/100g
gBr
sample
in
number
bromine
Expected
g
sample
g
toluene
2
2
u
Obtain the dilution coefficient in advance according to the following equation:
g
sample
toluene(g)
g
sample
D
t
coefficien
Dilution
