Process of jointly producing melamine and ammonium bicarbonate with limekiln gas

A technology of ammonium bicarbonate and melamine, applied in the chemical industry, can solve the problems of carbon dioxide deficiency and ammonia excess, and achieve the effect of increasing enterprise income

Inactive Publication Date: 2012-09-26
李东田
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of excess ammonia and lack of carbon dioxide in the process of producing melamine, and utilize cheap lime kiln gas as the gas source of carbon dioxide required for the synthesis of ammonium bicarbonate, so that all melamine reaction tail gas can be converted into added value Higher ammonium bicarbonate increases business operating income

Method used

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  • Process of jointly producing melamine and ammonium bicarbonate with limekiln gas

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Embodiment Construction

[0010] In the case that the melamine production line is matched with the continuous calcining lime kiln, the tail gas of the lime kiln is drawn out by a fan, and the oxygen content in the tail gas is controlled to be 0.8%, the carbon dioxide is 30%, the pressure is 480mm water column, and the temperature is 100°C. The gas washed and cooled to 35°C is sent to the gas cabinet, and the gas in the gas cabinet is drawn out by the Roots blower and then subjected to electrostatic dust removal, then pressurized and cooled by the compressor, and then the pressure is controlled at 0.9Mpa and the temperature is 35°C. , react with concentrated ammonia water in the carbonization tower to form ammonium bicarbonate crystals, and the crystal liquid is separated by a thickener and a centrifuge to obtain ammonium bicarbonate products.

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Abstract

The invention discloses a process of jointly producing melamine and ammonium bicarbonate with limekiln gas. The tail gas from limestone calcining is collected and then is washed, purified, lowered in temperarure, dedusted by static electricity, pressurized and cooled, and stronger ammonia water which is prepared by the tail gas of the melamine reacts with the tail gas from the limestone calciningin a carbonizing tower to synthesize the ammonium bicarbonate. The process produces the ammonium bicarbonate with high additional value by using the low-cost lime kiln tail gas. In addition, the process can jointly produce the melamine and the ammonium bicarbonate, thereby increasing the enterprise income, treating the tail gas from the lime production and reducing the emission of CO2.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a production process for producing ammonium bicarbonate by using tail gas produced from melamine. Background technique [0002] Melamine is an important nitrogen-heterocyclic organic chemical raw material, mainly used in the production of melamine-formaldehyde resin, widely used in wood processing, plastics, papermaking, medicine and other industries. At present, the production method of melamine is mainly the urea method, that is, urea in Under the condition of heating and certain pressure, melamine is generated through pyrolysis, and part of ammonia and carbon dioxide are produced by-product, and the amount of ammonia is about twice that of carbon dioxide. The circulating ammonia gas returns to the system after being purified and pressurized, and this part of the reaction tail gas needs to be digested. The current low-pressure process in the industry mainl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/26C07D251/58
Inventor 李东田
Owner 李东田
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