KEM MKC-710 - Preparation of Reagent

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
gecyclohexengtoluene
100
massmolecular ecyclohexen82.15
gecyclohexenmassmolecular bromine159.83
/100g)Br (mg valuelTheoretica
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
/100ggBrsample innumber bromine Expected
gsamplegtoluene
2
2
u
Obtain the dilution coefficient in advance according to the following equation:
 
 
gsample
toluene(g)gsample
Dtcoefficien Dilution
