Physicochemical properties and preparation method of hexamethylenetetramine

Hexamethylenetetramine

[Structural formula]

[Physical and chemical properties] Also known as urotropine, cyclohexamethylenetetramine, hexamethylenetetramine

[Preparation]

① Preparation method 1

Take 200 mL of a solution with a formaldehyde content of 30% to 40% in a container, and pass ammonia water under constant stirring.

Heat the above reaction mixture and filter if there is precipitation.

② Preparation method 2

After cooling, the formaldehyde gas obtained by oxidation of methanol undergoes an acetal reaction with ammonia gas in the mother liquor at a temperature of 68-73℃ in the reactor to produce urotropine.

③ Preparation method 3

Chen Minsheng et al.

The power of the continuous CO ₂ laser used in the experiment is 15W, and the power density at the focal spot is about 2000W/cm ² after focusing

The production process of urotropine is shown in Figure 6-2

Figure 6-2 The production process of urotropine

The aqueous formaldehyde solution is sent from the formaldehyde storage tank to the high-level formaldehyde tank with a formaldehyde pump

Ammonia gas is sent in from outside, and after a certain flow rate is controlled by a regulating valve, it also enters the bottom of the reactor for bubbling reaction, and the temperature is controlled at about 60°C

The mass fraction of hexamine concentrate is controlled by the feed volume and heating steam.

The dehydrated hexamine containing 3% to 5% of water content (mass fraction) is sent to the drying system, and the hexamine is dried by air flow to produce hexamine with a mass fraction of 99.

A small amount of hexamine powder is drawn into the cyclone separator by the induced draft fan for separation, and then enters the bag filter.

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