Technological method for jointly preparing liquid hydrogen cyanide and bisisobutyronitrile hydrazine

A technology for the combined preparation of diisobutyronitrile, which is applied in the direction of cyanic acid/isocyanic acid, hydrogen cyanide addition preparation, organic chemistry, etc., can solve the problem of complicated hydrogen cyanide purification process, low utilization rate of hydrogen cyanide, energy Consumption and other problems, to avoid pollution and its harm to the human body, high utilization rate, low energy consumption effect

Active Publication Date: 2015-06-24
枣阳市金鹿化工有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

But because the preparation of acetone cyanohydrin needs to use the liquid hydrocyanic acid of high purity, so its cost of preparing diisobutyronitrile hydrazine by acetone cyanohydrin method is higher
[0005] The above methods have complex hydrogen cyanide purification process, high cost, high energy consumption; or low utilization rate of hydrogen cyanide, etc., which are difficult to accept in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Ammonia removal: add 35% sulfuric acid aqueous solution into the dilute sulfuric acid metering tank as an ammonia removal agent, pass the hydrogen cyanide gas mixture obtained from the cracking of light oil into the ammonia removal tower from the bottom, and spray it into the ammonia removal tower at the same time The mixed gas of dilute sulfuric acid and hydrocyanic acid is countercurrently absorbed by the ammonia removal liquid to remove the ammonia contained in it, and then comes out from the top of the ammonia removal tower; the ammonia removal liquid after absorbing ammonia can be recycled after being cooled, and new dilute sulfuric acid is replaced regularly.

[0029](2) Water removal: The mixed gas of hydrocyanic acid from the top of the ammonia removal tower is passed into the cooling tower from the bottom. The cooling temperature of the cooling tower is 10°C to 20°C. Turn into condensed water and return it to the bottom of the tower with a pipeline, and the ...

Embodiment 2

[0033] The difference between this embodiment and embodiment 1 is:

[0034] Cancel the cooling water removal before the sulfuric acid water removal.

[0035] (1) Ammonia removal: Add 35% dilute sulfuric acid aqueous solution into the dilute sulfuric acid metering tank, pass the hydrocyanic acid mixture gas obtained from light oil cracking into the ammonia removal tower from the bottom, and spray dilute sulfuric acid from the top of the ammonia removal tower at the same time, The reaction mixture is absorbed by the ammonia removal liquid countercurrently to remove the ammonia contained in it, and then comes out from the top of the ammonia removal tower; the ammonia removal liquid after absorbing ammonia is cooled and recycled, and replaced with new dilute sulfuric acid regularly.

[0036] (2) Dehydration: Add 70% sulfuric acid into the sulfuric acid metering tank as a dehydrating agent, and the mixed gas from the top of the cooling tower is passed into the dehydration tower fro...

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Abstract

The invention provides a technological method for jointly preparing liquid hydrogen cyanide and bisisobutyronitrile hydrazine. The technological method comprises the steps that a light oil cracking hydrogen cyanide gas mixture is used as a raw material and undergoes an ammonia removal process and a cryogenic process to obtain liquid hydrogen cyanide, wherein in the ammonia removal process, the hydrogen cyanide gas mixture is absorbed with a sulfuric acid aqueous solution; in the cryogenic process, the hydrogen cyanide gas mixture is cooled to minus 10-minus 20 DEG C, after the hydrogen cyanide gas mixture is cooled, a part of the hydrogen cyanide gas becomes liquid to obtain liquid hydrogen cyanide, and the other part of the hydrogen cyanide gas is the tail gas containing hydrogen cyanide; the tail gas containing hydrogen cyanide, which undergoes cryogenic treatment, is absorbed with a ketazine aqueous solution to obtain an aqueous solution containing bisisobutyronitrile hydrazine, and the aqueous solution containing bisisobutyronitrile hydrazine undergoes cooling, crystallization and centrifugal filtration to obtain a bisisobutyronitrile hydrazine crystalline solid. By adopting the technological method, the purification efficiency and the utilization efficiency of hydrogen cyanide can be obviously improved, meanwhile, the energy consumption in the hydrogen cyanide purification process is greatly reduced and can be reduced by 90% at most, and the utilization rate of hydrogen cyanide is more than 99.9%.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a method for purifying hydrocyanic acid from a reaction mixture gas produced by cracking light oil and producing diisobutyronitrile hydrazine by utilizing tail gas. Background technique [0002] Hydrocyanic acid is a widely used chemical raw material, which can be used in many fields such as medicine, pesticides, cosmetics, dyes, fertilizers, electroplating, polymer materials, photography, mining, metallurgy, etc. At present, the main production methods of hydrocyanic acid mainly include light oil cracking method, Andrussow method, BMA method and acrylonitrile by-product method. Light oil cracking is a production method in which light oil (or gasoline), liquid ammonia and caustic soda are used as the main raw materials, and petroleum coke particles and nitrogen are used as auxiliary raw materials. Mixing, preheating to 280°C, immersing the petroleum coke particle layer through the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/14C07C255/66
CPCC01C3/14C07C253/08C07C255/66
Inventor 刘海艳王友仁杨卓华詹勇
Owner 枣阳市金鹿化工有限公司
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