Description of rated indices

Rate for grade, synthesis

Superior quality

First quality

Density at 20°C (g/cm3)

0.877-0.880

0.877-0.880

Distillation range: 95% volume from boiling point is distilled within the following temperature range, oC, not more than (including pure benzol boiling temperature 80.1°C)

0.6

0.6

Crystallization temperature (°C, not lower than)

5.3

5.3

Impurities fractions (of total mass) are as follows (%, not more than):

 

 

N/heptane

-

-

Methyl cyclohexane + toluene

-

-

Sulphuric acid coloring (reference scale number, not more than)

0.1

0.1

Bromine absorption number (g/100 cm3 of benzol, not more than)

-

-

Fractions (of total mass) are as follows (%, not more than):

 

 

Hydrogen sulphide

0.00007

0.0001

Thiophene

0.0002

0.0004

Hydrogen sulphide and mercaptans

-

-

Total sulphur

0.0001

0.00015

Copper strip test

Withstands

Water extract reaction

Neutral

 



  Coal tar naphtha (benzol), GOST 8448-78

 

Field of application: Raw material for organic synthesis.

External appearance and color.
Transparent liquid containing no foreign impurities, including water, suspended and settled to the bottom; the liquid is not darker than color of 0.003 g of K2Cr2O7 solution in 1 dm3 .