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Process and system for preparing high-purity liquid hydrogen cyanide

A hydrogen cyanide, liquid state technology, applied in the field of high-purity liquid hydrogen cyanide production process and system, can solve the problems of inability to meet the use requirements of downstream users and high water content, and achieve the benefits of safe production, smooth production, and alleviation of environmental protection. effect of stress

Active Publication Date: 2016-03-02
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Similar to it is the ammoxidation of methanol. After hydrogen cyanide gas is obtained, ordinary hydrocyanic acid liquid product is obtained after water absorption and purification. The concentration is about 90 (wt)%, some are even lower, and the water content is higher. Increasingly unable to meet the requirements of downstream users
[0008] In recent years, downstream users have continuously improved production and product quality, and put forward higher and higher purity requirements for the purity of hydrocyanic acid. Some require water content below 1000ppm or even lower, so the existing technology can no longer meet the requirements. The requirements of downstream users require the development of a new process for the production of high-purity hydrocyanic acid

Method used

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  • Process and system for preparing high-purity liquid hydrogen cyanide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The gas A containing hydrogen cyanide at 30°C enters the absorption tower 1, and the low-temperature water B at 10°C is sprayed into the top of the absorption tower 1. After absorption, a 3% HCN aqueous solution is obtained in the tower reactor, and the tail gas C after absorption is sent to the top of the tower. into the tail gas absorption device for treatment. The HCN aqueous solution is sent into the three-section rectifying tower 2 for separation and purification, and the HCN aqueous solution is fed between the lower tower 10 and the middle tower 9, and enters the upper tower 8 through the middle tower 9 and the middle condenser 3, and the middle tower 9 part reflux ratio is 10. Finally, the HCN gas is evaporated from the top of the tower, and then enters the reflux condenser 4 and the gas-liquid separator 5, wherein the gas-liquid separator 5 has a baffle 11 that is conducive to the separation of water vapor, and the partially condensed liquid phase is returned to ...

Embodiment 2

[0032] The gas A containing hydrogen cyanide at 40°C enters the absorption tower 1, and the low-temperature water B at 8°C is sprayed into the top of the absorption tower 1. After absorption, a 2.8% HCN aqueous solution is obtained in the tower kettle, and the tail gas C after absorption is sent from the top of the tower. into the tail gas absorption device for treatment. The HCN aqueous solution is sent into the three-section rectifying tower 2 for separation and purification, and the HCN aqueous solution is fed between the lower tower 10 and the middle tower 9, and enters the upper tower 8 through the middle tower 9 and the middle condenser 3, and the middle tower 9 part reflux ratio is 10. Finally, the HCN gas is evaporated from the top of the tower, and then enters the reflux condenser 4 and the gas-liquid separator 5, wherein the gas-liquid separator 5 has a baffle 11 that is conducive to the separation of water vapor, and the partially condensed liquid phase is returned t...

Embodiment 3

[0034] The gas A containing hydrogen cyanide at 20°C enters the absorption tower 1, and the low-temperature water B at 15°C is sprayed into the top of the absorption tower 1, and 2.5% HCN aqueous solution is obtained in the tower kettle after absorption, and the tail gas C after absorption is sent from the top of the tower into the tail gas absorption device for treatment. The HCN aqueous solution is sent into the three-section rectifying tower 2 for separation and purification, and the HCN aqueous solution is fed between the lower tower 10 and the middle tower 9, and enters the upper tower 8 through the middle tower 9 and the middle condenser 3, and the middle tower 9 part reflux ratio is 10. Finally, the HCN gas is evaporated from the top of the tower, and then enters the reflux condenser 4 and the gas-liquid separator 5, and the partially condensed liquid phase returns to the tower as reflux, with a reflux ratio of 15, and the uncondensed HCN gas enters the finished product ...

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Abstract

The present invention provides a method for producing a high-purity liquid hydrogen cyanide for hydrogen cyanide gas obtained by ammoxidation. The liquid hydrogen cyanide of a low water content is obtained by absorption of low-temperature water in an absorbing tower and operation of a three-stage distillation tower and a gas-liquid separator. The process and method have the beneficial effects that by virtue of adoption by low-temperature water, the absorption efficiency of HCN gas is improved, the load on subsequent exhaust gas processing facilitates is alleviated, and the environmental protection pressure is relieved. Refined by the process disclosed by the invention, the content of a finished product hydrogen cyanide water can reach below 50 ppm, thereby sufficiently satisfying the using requirements on downstream users; the leakage risk of the hydrogen cyanide is effectively avoided, thereby more facilitating the safe production; and self-polymerization of hydrogen cyanide can be further slowed, so that production is more smooth and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a process and system for preparing high-purity liquid hydrogen cyanide. Background technique [0002] Hydrocyanic acid is a versatile chemical used in the manufacture of nylon, pesticides, acrylonitrile and acrylic resins, among others. Especially the demand for hydrocyanic acid from hexanediol and methacrylate resins shows great market demand. [0003] However, the physical properties of hydrogen cyanide are quite special, it is a highly toxic chemical, it is easy to diffuse under normal temperature and pressure, it is miscible with water, it can be miscible with ethanol, ether, glycerin, benzene, chloroform, etc. Polymerization, blockage of pipelines and equipment, affecting the production of this device and even downstream devices. [0004] The process for producing hydrocyanic acid is mainly the Andrussow method (Andrussow method, Angle method), and ...

Claims

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Application Information

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IPC IPC(8): C01C3/04
CPCC01C3/04
Inventor 张红柳王聪李荣杨克俭赵敏伟梁军湘谢蕊闫伟兰杰刘晶赵斌赵丽丽屈阁许景洋郭启迪霍瑜姝
Owner CHINA TIANCHEN ENG
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