Sodium cyanide evaporation and concentration device and method

An evaporation concentration, sodium cyanide technology, applied in metal cyanide, simple alkali metal cyanide, chemical industry and other directions, can solve the problems of affecting product quality, end-point temperature rise, high energy cost

Active Publication Date: 2013-12-25
CHONGQING UNISPLENDOUR CHEM
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Problems solved by technology

[0004] In the prior art, a single-effect evaporator is used to evaporate the sodium cyanide material concentration process, which requires high vacuum in the system, and the temperature at the end point of the material rises, which leads to the hydrolysis of sodium cyanide and affects the product quality. At the same time, the disadvantage of the existing method is steam consumption. High volume, high energy costs

Method used

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  • Sodium cyanide evaporation and concentration device and method

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Embodiment 1

[0027] Sodium cyanide liquid material (31-38% sodium cyanide, water 69-62%, temperature: 40°C, flow rate: 3.3-4.0t / h) starts from the raw material storage tank 7 and enters the heat exchanger 10 through the liquid pump 9 , enter from the lower port of the heater A 2 tube layer, when the liquid level in the tower reaches the specified level, start the forced circulation pump 6, and the material is pumped from the nozzle into the crystallizer 1 for flash evaporation (evaporating temperature 40-42°C), The concentrated liquid and the secondary steam are separated into vapor and liquid in the crystallizer 1, the top pressure of the crystallizer 1 is 30-80Mpa, and the temperature is 30-40°C.

[0028] The secondary steam after gas-liquid separation enters the reboiler 4 shell layer, and the working medium (freon or liquid ammonia) enters the reboiler 4 tube layer from the working medium tank, and the working medium circulates in the tube layer through the circulation pump 11, and ...

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Abstract

The invention discloses a sodium cyanide evaporation and concentration device and method. On the basis of the prior art, a vapor compressor, a reboiler and other main equipment are added, secondary steam generated in the material evaporation process and a working medium circulating in the reboiler are subject to heat exchange, and the working medium steam is compressed to heat the sodium cyanide liquid material so as to achieve the purposes of evaporation and concentration. The method can remarkably lower the steam consumption, has an obvious energy-saving effect, achieves evaporation and concentration under the condition of relatively low temperature, can effectively improve the product quality and is an efficient and economical method.

Description

technical field [0001] The invention relates to post-processing equipment and techniques for the synthesis reaction of sodium cyanide, in particular to an evaporation concentration device and method for sodium cyanide aqueous solution. Background technique [0002] my country's sodium cyanide products are mainly used in metal smelting, chemical synthesis, pesticides, medicine, and electroplating industries. The metallurgical industry is mainly used for the extraction of precious metals such as gold, silver, copper, and zinc; the pharmaceutical industry is mainly used as a part of pharmaceutical additives, such as the production of caffeine, berberine, cocaine, aminophylline, pyrimethamine, etc.; chemical synthesis It is mainly used for the synthesis of cyanuric chloride, EDTA, cyanoacetic acid, methyl malonate, hydroxyacetonitrile, etc.; the electroplating industry is mainly used as a complexing agent for copper plating, silver, cadmium, and zinc; the pesticide industry is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/10
CPCY02P20/10
Inventor 韦异勇覃玉芳徐洪金海琴
Owner CHONGQING UNISPLENDOUR CHEM
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