Hexamine (Liquid Phase Process)

Introduction

Formalin reacts with ammonia in Reactor to yield hexamine solution. Meanwhile heat is released, to continuously remove which and control the reaction temperature lower than 70℃, cooling water is employed, otherwise, oil like polymers will be generated. To shift the equilibrium position towards the formation of hexamine, the pH of reaction solution shall be controlled in the range of 8.5-9 and ammonia shall be excessive by 1.0-1.5%. The obtained hexamine solution is first concentrated by Film Evaporator, and then further dehydrated by Evaporation Pot to produce saturated hexamine crystalline liquor. Finaly the crystals are separated with mother liquor, and then charged for drying to give hexamine product in powder.

Technical Features

In production, in order to shift the equilibrium position towards the formation of hexamine, and at the same time to avoid side reactions which may affect product quality and consumption, it is important to well control the reaction temperature and ensure the excess of ammonia. That is to say, it is necessary to ensure the presence of free ammonia so that counter reactions and the formation of TMA(Trimethylamine) can be inhibited.

owing to the use of Evaporation Pot, the crystals are formed in a relatively long time, thereby hexamine product of bigger size can be obtained, which is popular with the end users.

Hexamine specification

Item	Superior	First grade	Acceptable grade
Appearance	White or lighted colored crystals without visible impurities
Purity, % ≥	99.3	99.0	98.0
Moisture, % ≤	0.50		1.0
Ashes, % ≤	0.03	0.05	0.08
Appearance of aqueous solution	Qualified		/
Heavy metal as per Pb²⁺, % ≤	0.001		/
Chloride as per Cl^-, % ≤	0.015		/
Sulphate as per SO₄^2-, % ≤	0.02		/
Ammonium as per NH₄⁺, % ≤	0.001		/

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Methanol Industry(C1)

Hexamine (Liquid Phase Process)

Introduction

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All Categories

Methanol Industry(C1)

Hexamine (Liquid Phase Process)

Introduction

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