1,6-Hexanediamine for industrial use (2)

5 Test method

5.

Some test procedures specified by the test method may lead to dangerous situations

5.

Unless otherwise specified, only reagents confirmed to be analytically pure and grade 3 water specified in GB/T6682-1992 are used in the analysis

The standard titration solutions, standard solutions for impurity determination, preparations and products used in the test methods are all prepared in accordance with GB/T601-2002 and GB/T603-2002 when other requirements are not specified

5.

Take an appropriate amount of laboratory samples, melt them below 60°C, pour them into a colorimetric tube, place the colorimetric tube in a 42°C～45°C water bath, and check immediately to see if it is a colorless and transparent liquid

5.

5.

Use methyl red as indicator and titrate with hydrochloric acid standard titration solution

5.

5.

5.

5.

Weigh 1.

5.

The mass fraction w _{1 of} 1,6-hexamethylene diamine (C ₆ H ₁₆ N ₂ ) , the value is expressed in %, calculated according to formula (1):

Where:

V— The value of the volume of the hydrochloric acid standard titration solution (5.
4.
2.
1), the unit is milliliters (mL);

c— The exact value of the concentration of the hydrochloric acid standard titration solution, in moles per liter (mol/L);

m—The value of the mass of the sample, in grams (g);

M—The value of the molar mass of 1,6-hexamethylene diamine, in grams per mole (g/mol) [M(1/2C ₆ H ₁₆ N ₂ )=58.
1]
.

Take the arithmetic average of the two parallel determination results as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.
1%
.

5.
5 Determination of chromaticity of aqueous solution

According to the provisions of GB/T3143-1982
.
Weigh (70±0.
1)g of the laboratory sample in the molten state, dissolve it in water, and dilute to 100mL
.

5.
6 Determination of moisture

According to the provisions of GB/T6283-1986
.
Add 5 mL of glacial acetic acid to the titration cell, and put the titration cell in an ice water bath
.

Take the arithmetic mean of the two parallel determination results as the determination result, and the absolute difference between the two parallel determination results shall not be greater than 15% of the arithmetic mean of the two determination values
.

5.
7 Determination of crystallization point

According to the provisions of GB/T7533-1993
.
The main thermometer allows the use of local immersion thermometers
.

Take the arithmetic mean of the two parallel determination results as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.
05°C
.