Process for jointly producing cyanuramide, sodium carbonate and ammonium chloride by using carbamide

A joint production and ammonium chloride technology, which is applied in the field of melamine production, joint production of melamine, soda ash and ammonium chloride, can solve the problem that melamine tail gas cannot fully utilize the waste heat steam, and achieve the effect of energy saving

Active Publication Date: 2009-09-02
BEIJING EDGEIN TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The second technical problem to be solved by the present invention is that the treatment of melamine tail gas in the prior art cannot fully utilize a large amount of waste heat steam in the melamine preparation process, and then provide a honeycomb that can make full use of the above waste heat steam Amine Combined Production of Soda Ash and Ammonium Chloride Process

Method used

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  • Process for jointly producing cyanuramide, sodium carbonate and ammonium chloride by using carbamide

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Embodiment 1

[0050] The preparation method for melamine in this embodiment is a low pressure gas phase quenching method. It selects molten urea with water content not higher than 0.5wt%, and sends it to the fluidized bed reactor by a molten urea pump, sets the reaction pressure in the fluidized bed to 0.1MPa (gauge pressure), and the reaction temperature to 390°C. Under the action of catalysts containing aluminum silicate, aluminum oxide, silicon oxide, titanium oxide, etc., urea, which accounts for 95wt% of the reactor, undergoes a series of physical and chemical reactions to generate melamine and release NH at the same time. 3 , CO 2 gas. The heat required for this reaction is indirectly provided by the high temperature molten salt in the fluidized bed reactor. The mixed gas generated by the reaction is cooled to 325°C and filtered to remove mechanical impurities such as deamination products and catalysts.

[0051] The mixed gas after high-temperature filtration enters the melamine cr...

Embodiment 2

[0059] The preparation method for melamine in this embodiment is a low pressure liquid phase quenching method. The molten urea with water content not higher than 0.5wt% is pumped to the fluidized bed reactor by the molten urea pump, the reaction pressure in the fluidized bed is set to 0.60MPa (gauge pressure), the reaction temperature is 390°C, and the Under the action of catalysts such as aluminum, aluminum oxide, silicon oxide, and titanium oxide, the urea, which accounts for more than 95% of the input into the reactor, undergoes a series of physical and chemical reactions to generate melamine and release NH at the same time. 3 , CO 2 gas. The heat required for this reaction is indirectly provided by the high temperature molten salt in the fluidized bed reactor.

[0060] The reaction product gas flowing out from the top of the reactor contains melamine, CO 2 , NH 3 , a small amount of by-products and some catalyst dust are sprayed and quenched by the overflow clear liqui...

Embodiment 3

[0070] The preparation method for melamine in this embodiment is a high-pressure liquid phase quenching method. The molten urea with water content not higher than 0.5wt% is sent to the high-pressure gas-liquid reactor by the molten urea pump, the reaction pressure is set to 8.0MPa (gauge pressure), the reaction temperature is 380°C, and the reaction does not require a catalyst, then more than 90wt% The urea produces melamine through a series of physical and chemical reactions, and releases NH at the same time 3 , CO 2 gas. The heat required for the reaction is indirectly provided by the high-temperature molten salt in the vessel.

[0071] The discharge from the top of the reactor contains melamine, NH 3 , CO 2 And a small amount of gas-liquid mixture of by-products, the gas mixture is sprayed and quenched in the urea quenching tower by the methylammonium liquid sent by the subsequent absorption tower, the temperature drops to 160 ° C, and the gas is washed by the scrubber,...

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Abstract

The invention relates to a process for jointly producing cyanuramide, sodium carbonate and ammonium chloride by using carbamide, which comprises the steps of producing the cyanuramide, refining bittern or brine and absorbing tail gas, acidulating sodium bicarbonate to separate base out, separating the sodium carbonate, decomposing, rectifying and denitrifying the mother liquor of the sodium bicarbonate, steaming and concentrating deamination liquor to separate sodium chloride, and separating ammonium chloride from the clear solution of salt. The total utilization of the carbamide can be up to 100 percent, the tail gas and considerable afterheat and steam generated in the cyanuramide production process can be fully utilized and the energy is saved.

Description

technical field [0001] The invention relates to a process for producing melamine, soda ash and ammonium chloride, in particular to a process for jointly producing melamine, soda ash and ammonium chloride by using urea as a raw material, and belongs to the field of production and preparation of melamine, soda ash and ammonium chloride. Background technique [0002] The chemical name of soda ash is sodium carbonate (NaCO3), also known as soda and soda ash (Soda Ash), which is an important and large-tonnage basic inorganic chemical raw material. Soda ash has a wide range of uses and can be used to make glass, such as flat glass, bottle glass, optical glass and high-grade utensils; it can also use fatty acids to react with soda ash to make soap; Industrial removal of sulfur and phosphorus impurities, ore dressing, and preparation of copper, lead, nickel, tin, uranium, aluminum and other metals, chemical industry preparation of sodium salts and metal carbonates, bleaching agents,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/60C01D7/12C01C1/16C05C3/00
Inventor 唐印王以贵易江林刘文信龚元德钱怀国陈辉苏刚
Owner BEIJING EDGEIN TECH
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