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Method for purifying hydrocyanic acid from mixed gas containing hydrocyanic acid

A technology containing hydrocyanic acid and mixed gas, applied in the chemical industry, can solve the problems of low purification efficiency of hydrocyanic acid, low concentration of hydrocyanic acid, low absorption temperature, etc., shortening the rectification time, improving purification efficiency and energy consumption reduced effect

Inactive Publication Date: 2012-06-20
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above hydrocyanic acid purification process, the absorption step not only requires a lower absorption temperature (10-15°C), which leads to high energy consumption for cooling down, but also has a low concentration of hydrocyanic acid in the obtained hydrocyanic acid absorption solution (approx. 10g / L), resulting in low purification efficiency of hydrocyanic acid

Method used

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  • Method for purifying hydrocyanic acid from mixed gas containing hydrocyanic acid
  • Method for purifying hydrocyanic acid from mixed gas containing hydrocyanic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1. Pure hydrocyanic acid from the reaction of hydrocytic acid synthesis of hydrocyric acid

[0015] Device schematic diagram figure 1 Show.

[0016] a.Ammonia removal: Add ammonia removal solution to the ammonia removal liquid meter 1 (sulfate solution with pH 4), and the reaction gas of the Anshisa synthesized hydrocyanic acid is passed into the ammonia removal tower 2 from the bottom.2 Spray the ammonia removal liquid at the top, and react with the mixture of the mixture to remove the ammonia contained in the ammonia.After the ammonia liquid is used by the ammonia removal cooler 3, it is used after cooling, and the new ammonia removal solution is replaced regularly;

[0017] b.Absorption: Press the reaction mixture after removing the reaction of ammonia to 0.7MPa, and then cool down through a pressurized mixed gas cooler 6 to 45 ° C to pass the pressure mixed air buffer 7;The pressure hybrid gas in the tank 7 uses a constant pressure 0.7MPa from the bottom of the ...

Embodiment 2

[0019] Example 2. Purify hydrocyanic acid from the reaction of hydrocytic acid synthetic hydrocyanic acid

[0020] The difference between this embodiment and Example 1 is:

[0021] In the absorption step, the pressure of the control pressure absorption tower 8 is 0.3MPa, the temperature is 25 ° C, and finally obtains a hydrocyanic acid absorption solution with a concentration of 52g / L.

Embodiment 3

[0022] Example 3. Purify hydrocyanic acid from the reaction of hydrocytic acid synthesis of hydrocyric acid

[0023] The difference between this embodiment and Example 1 is:

[0024] In the absorption step, the pressure of the control pressure absorption tower 8 is 0.5MPa, the temperature is 28 ° C, and finally obtains a hydrocyanic acid absorption solution with a concentration of 72g / L.

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Abstract

The invention discloses a method for purifying hydrocyanic acid from mixed gas containing the hydrocyanic acid, which comprises an absorption step and a rectification step, wherein in the absorption step, pressurizing the mixed gas containing the hydrocyanic acid to 0.11-1.5 MPa, then cooling to 10-80 DEG C, introducing into a pressure absorption tower, and pressurizing and absorbing the hydrocyanic acid in the mixed gas with absorption liquid, i.e. acidic aqueous solution with a pH value of 1-6 under the conditions that the pressure in the tower is 0.11-1.0 MPa, and the temperature is 0-60 DEG C to obtain hydrocyanic acid absorption liquid. The method has the beneficial effects that the existing atmospheric absorption method is replaced by a pressure absorption method to absorb the hydrocyanic acid in the mixed gas containing the hydrocyanic acid; the absorption temperature can be improved to 60 DEG C; the concentration of the hydrocyanic acid in the hydrocyanic acid absorption liquid can be improved by 3-10 times, so that the purifying efficiency of the hydrocyanic acid can be remarkably improved; and meanwhile, the energy consumption is greatly reduced and can be reduced by 80 percent to a maximum extent.

Description

Technical field [0001] The invention is a chemical industry, involving a method of purifying hydrocyanic acid from the reaction of hydrocyanic acid. Background technique [0002] Hydrocyanic acid is a widely used chemical raw material that can be applied to many fields such as pharmaceutical, pesticides, cosmetics, dyes, fertilizers, electroplating, polymer, photography, mining, metallurgy.The production methods of hydrocyanic acid include the Andrussow method, BMA method, light oil cracking method, and acrylite by -production method.An of the Anh method is to fully mix methane, ammonia, and oxygen in accordance with a certain proportion, and then pass the oxidation reactor. Based on platinum alloy or platinum alloy as a catalyst, it reflects the synthesis of hydrocyric acid under normal pressure and 1000 ° C.The BMA method is a improvement of the An of An of An of Anh. It does not require oxygen to participate in the response. It is based on platinum as a catalyst. The methane a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/04
Inventor 龙晓钦陈敬王友仁贺国伟田庆来任权陈勇邓术清周红龚一贵陈修毅
Owner CHONGQING UNISPLENDOUR CHEM
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