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Energy-saving technology for producing melamine by one-step method

A melamine and process technology, which is applied in the energy-saving production process of melamine, can solve the problems that waste heat cannot be recycled by the system, high power operation costs, and large heat loss, etc., to achieve continuous and automatic production, saving investment and operating costs , The effect of low investment and operation costs

Inactive Publication Date: 2012-06-13
徐建华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 1. The thermal efficiency of the molten salt heating system is low, the heat loss is large, the fuel consumption is high, and the waste heat cannot be recycled by the system, resulting in a large waste of heat; in addition, the molten salt needs to rely on power cycle, which consumes a lot of energy
[0012] 2. The liquid urine cooling and washing tower is made of stainless steel, which requires a large investment, takes up a large amount of production space, and has high operating costs such as electricity; and the liquid urine will not only cause a large amount of power consumption during the long-term forced circulation process, but also cause partial shrinkage. Urea, this part of biuret will not be converted into triamine during the reaction process, which increases the consumption of urea;
[0013] 3. The air-conditioning fan circulates on the total air path, the circulating air volume is large, and the inlet temperature is high, which makes the fan expensive and power consumption high

Method used

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  • Energy-saving technology for producing melamine by one-step method
  • Energy-saving technology for producing melamine by one-step method
  • Energy-saving technology for producing melamine by one-step method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1, the fluidized working gas of the fluidized bed is the mixed gas of ammonia and carbon dioxide provided by the circulating compressor.

[0037] The first step: the production of melamine

[0038] (1) Melt solid urea into liquid urine at about 135°C in the urine melting tank or send the liquid urine drawn from the urea system into the fluidized bed reactor for normal or low pressure reaction under the catalysis of silica gel, and the reaction gauge pressure Choose within the range of 20-1000Kpa, and control the temperature within the range of 380-398°C;

[0039] The above-mentioned fluidized bed reactor is heated by a superconducting liquid heating furnace, and the heating temperature of the furnace is required to be controlled within the range of 400-450°C;

[0040] (2) Fill the system with ammonia gas as the initial circulating working gas. Under the action of ammonia gas, liquid urine decomposes and reacts in the fluidized bed reactor to generate gaseous...

Embodiment 2

[0044] Embodiment 2, the fluidized bed fluidized working gas is the pure ammonia working gas provided by the synthetic ammonia section of the synthetic ammonia soda ash plant or the synthetic ammonia ammonium bicarbonate plant or the synthetic ammonia ammonium nitrate plant.

[0045] The process route of embodiment two and embodiment one is basically the same, the difference is: the one, when melamine is made, the pure ammonia gas provided by the synthetic ammonia workshop section of synthetic ammonia soda ash plant or synthetic ammonia ammonium bicarbonate plant or synthetic ammonia ammonium nitrate plant is used as working gas, the table The pressure is about 100-300Kpa; the second is that the mixed tail gas of purified ammonia and carbon dioxide enters the synthetic ammonia soda ash plant or the synthetic ammonia ammonium bicarbonate plant or the synthetic ammonia ammonium nitrate plant to provide raw materials for recycling.

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Abstract

The invention discloses an energy-saving technology for producing melamine by a one-step method, mainly comprising the following steps: supplying heat to a fluidized bed reactor by a superconducting liquid heating furnace or a heat pipe heating furnace; cooling produced gas-state melamine and a high-temperature mixed gas of ammonia and carbon dioxide by a heat pipe exchanger; and then filtering, crystallizing and separating to obtain a finished product solid melamine, wherein the rest mixed gas of the ammonia and the carbon dioxide can be circularly used for supplying a working gas for a system after being purified and can also enter a synthesis ammonia soda ash device or a synthesis ammonia ammonium carbonate device or a synthesis ammonia nitramine device to be used for supplying a raw material for the system. Compared with the traditional one-step method, the energy-saving technology can reduce the fuel consumption by 40 percent and the electric power consumption by 30 percent.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to an energy-saving production process of melamine. Background technique [0002] At present, the production process of melamine includes normal pressure one-step method and normal pressure two-step method, and low-pressure one-step method and high-pressure one-step method. Relevant to the present invention are atmospheric pressure one-step process and low pressure one-step process. [0003] The main production process of the atmospheric pressure one-step method is to use the salt melting furnace as the heat source and urea as the raw material. The liquid urea reacts endothermicly under the action of the catalyst in the fluidized bed reactor to form a mixed gas of melamine, ammonia and carbon dioxide. The mixed gas After cooling, filtering, crystallization and separation, the finished melamine is obtained; the separated ammonia and carbon dioxide mixed gas is cooled and washed by t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D251/60
CPCY02P20/10
Inventor 徐建华郑小川
Owner 徐建华
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