Equipment and process for producing melamine under low pressure

A melamine and low-pressure technology, which is applied in the field of melamine production technology, can solve the problems of steam consumption, difficult treatment of filter residue, and difficult handling, so as to increase the production capacity of the device, reduce the gas circulation volume, and prolong the running time.
CN102584730AActive Publication Date: 2012-07-18ๆŽ้–้“ญ +2
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
ๆŽ้–้“ญ
Publication Date
2012-07-18

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Abstract

The invention discloses equipment and a process for producing melamine under a low pressure. The process comprises the following steps of: (1) atomizing molten urea, introducing into a reactor, and reacting by taking gas ammonia as a reaction carrier gas in a reactor under the condition that the temperature is 380-410 DEG C and the pressure is 0.1-1.4MPa to generate melamine, carbon dioxide, ammonia and a deamination product of melamine; (2) after reacting, crystalizing the deamination product, filtering, cooling the filtered gas with a quenching medium, and separating to obtain a finished product; (3) absorbing the gas left after separation with water to form a methylamine solution and a mixed gas; and (4) rectifying the mixed gas under the condition that the temperature is between 30 DEG C below zero and 30 DEG C to form ammonia gas, and returning the ammonia gas to the step (1) for serving as a reaction carrier gas or / and returning to the step (2) for serving as quenching medium. The invention further discloses equipment for producing melamine under a low pressure. The equipment and the process have the advantages of good product quality, high production efficiency, low energy consumption, environmental friendliness, simple process, and the like.
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Description

technical field

[0001] The invention relates to a melamine production process, in particular to a low-pressure melamine production process, and also relates to low-pressure melamine production equipment. Background technique

[0002] The production process of melamine usually includes three main processes such as polymerization reaction, quenching separation and tail gas treatment.

[0003] Polymerization reaction: urea is used as raw material, converted into melamine at a certain temperature and pressure, and NH is released at the same time 3 and CO 2 .

[0004] Quenching separation: divided into liquid phase quenching method and gas phase quenching method. The liquid phase quenching method usually quenches the reaction product with water or an aqueous solution containing melamine, so that the melamine is completely dissolved in the aqueous solution, or partially dissolved and partially crystallized; the gas phase quenching method is usually used to contain NH 3 and CO ...

Claims

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