Synthesis of Hexamethylenetetramine (Hexamine)

To a beaker immersed in an ice bath add 200 mL of conc. formaldehyde and start adding slowly 320 mL of 30 % ammonium hydroxide solution, the temperature must be kept below 20°C. Then evaporate the water off by heating the flask in a hot water bath, recrystallize the hexamine in hot ethanol.

Capture

Addition of the ammonia solution

d

Evaporation of the water

u

The dry product

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