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Method for producing melamine

A technology of melamine and its production method, which is applied in the field of melamine production technology, can solve the problems of large energy consumption and consumption, and achieve the effect of saving power consumption

Inactive Publication Date: 2013-03-27
SHANDONG SHUNTIAN CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of consuming a large amount of energy in the tail gas circulation and pressurization process existing in the melamine production process in the prior art. Carried out under the composite process, a new process of saving energy and reducing consumption

Method used

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  • Method for producing melamine
  • Method for producing melamine

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Embodiment Construction

[0019] The molten urea is pumped to the urea adding port of the reactor through the urine pump, atomized under the action of the atomizing gas and enters the reactor. Under the gauge pressure of 1.2MPa and the high temperature of 390°C, the catalyst reacts to form melamine. The heat required for the reaction is provided by a molten salt system. The carrier gas of the fluidized bed comes from the mixed gas of ammonia and carbon dioxide after purification, cooling and preheating. After the reaction, the gas products, by-products and carrier gas pass through the cyclone separator to recover most of the catalyst particles entrained in the gas flow, and then enter the heat exchanger and hot gas filter to filter out solid impurities such as catalyst in the gas flow. The hot gas filter is a bag-type reverse blowing structure, and there are two sets. When the filter resistance rises to the specified value, it can be switched to another spare filter to continue running. The dust-free ...

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Abstract

The invention discloses a method for producing melamine. Aiming to solve the problem of huge energy consumption in a tail gas circular pressurizing process in the production process of the melamine, through an optimized process design, the invention provides the method in which the production of melamine is carried out in different pressure sections and in a composite process of plural circulation and non-circulation, wherein primary tail gas is taken as carrier gas by secondary tail gas, and the secondary tail gas is not pressurized by a compressor and directly enters a reactor by utilizing over-bottom pressure of the tail gas, and thus, the compression process of the part of the gas is omitted, and the power consumption of the part of the gas is correspondingly reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a production process of melamine. Background technique [0002] At present, the liquid phase melamine production technology generally adopted in the world and the domestic one-step gas phase quenching and two-step recrystallization production technology, the synthesis process of melamine is in the same pressure range (referring to the reactor inlet pressure to the tail gas scrubber outlet pressure ) completed under. The production process of the prior art is: the molten urea is pumped to the urea inlet of the reactor through urine pump, atomized under the action of the atomizing gas and enters the reactor, under a gauge pressure of a MPa and a high temperature of 390°C, through Catalyst, the reaction generates melamine. The heat required for the reaction is provided by a molten salt system. The carrier gas of the fluidized bed comes from the mixed gas o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D251/60
Inventor 李东田李日升
Owner SHANDONG SHUNTIAN CHEM GRP
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