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Method and installation for two-step type prodn. of melamine

A melamine and equipment technology, applied in the two-step process and equipment field of melamine, can solve the problems of large consumption of ammonia gas, large energy consumption, long process flow, etc., and achieve reduction in equipment repair and maintenance, reduction in operating points, and production The effect of process simplification

Inactive Publication Date: 2006-04-12
山东海化魁星化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is long, consumes a lot of energy, and the circulating gas consumes a lot of ammonia after being washed and absorbed.

Method used

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  • Method and installation for two-step type prodn. of melamine
  • Method and installation for two-step type prodn. of melamine

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Embodiment Construction

[0011] Such as figure 2 In comparison, the equipment for producing melamine by the two-step method of the present invention comprises a reactor 4, a catcher 1, and an absorption tower 2, and the gas outlet of the catcher 1 is equipped with two gas paths 5,6 to communicate with the absorption tower 2 and the absorber 2 respectively. A reactor 4, wherein a cooler 7, a filter 8, and a hot press 9 are sequentially arranged on the gas path 6.

[0012] The equipment adopting the above structure can have the following working process: the tail gas (the mixture containing ammonia, carbon dioxide and a small amount of melamine low-temperature by-product) from the trap 1 is divided into two paths by the gas path 5 and 6, which are respectively directed to the absorption tower 2 and the reaction 4, the tail gas entering the absorption tower 2 through the gas path 5 enters the absorption tower 2 for washing and absorption, it first absorbs the carbon dioxide in the gas from the concentra...

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Abstract

This invention discloses a two-step preparation method and equipment for tri-poly-cyan-amine, it is characterized by small part of tail gas produced through capture trap going into absorption tower, the rest most part of tail gas out of capture trap being removed impurities and compressed into reactor through hot press. Compared with conventional existing method the process of the invention is greatly simplified, energy consumption decreased and it is convenient to operate.

Description

technical field [0001] The invention relates to the field of chemical engineering, in particular to a two-step process and equipment for melamine. Background technique [0002] In the current two-step process of melamine, such as figure 1 As shown, the gas (high-temperature mixture containing ammonia, carbon dioxide and a small amount of impurities) that comes out after being cooled by 3-5 traps 1 all enters 3-5 packed absorption towers 2 for washing and absorption, mainly absorbing ammonia in the mixed gas , carbon dioxide and a small amount of impurities and cool the hot gas. The gas after absorption is ammonia gas containing a very small amount of carbon dioxide and water. After the gas is cooled by ammonia condenser 3 and water condenser, carbon dioxide and water in the gas are removed. After purification, it is compressed by a compressor, heated to the required temperature and enters the reactor 4. The process is long and consumes a lot of energy, and the circulating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/56C07D251/60
Inventor 杨志诚周善华祝兴奎纪作福
Owner 山东海化魁星化工有限公司
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