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Environment-friendly clean production method for high purity sodium cyanide

A production method and sodium cyanide technology, applied in the direction of metal cyanide, simple alkali metal cyanide, etc., can solve the problems of increasing equipment investment, energy consumption and raw material consumption, and achieve environmental clean production, effective environmental clean production, and equipment Corrosion improvement effect

Inactive Publication Date: 2013-05-01
龙智
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This process increases equipment investment, energy consumption and raw material consumption

Method used

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  • Environment-friendly clean production method for high purity sodium cyanide

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Experimental program
Comparison scheme
Effect test

Embodiment

[0035] Embodiment: the synthetic gas of hydrogen cyanide is synthesized by the ammoxidation of natural gas by Angle's method, and the high-purity sodium cyanide aqueous solution is obtained directly by the absorption reaction of the sodium hydroxide aqueous solution without going through the ammonia removal process, and the free ammonia remains in the tail gas;

[0036] The composition of a certain synthesis gas before the absorption reaction is as follows:

[0037] serial number

[0038] 2

[0039] Sodium cyanide aqueous solution quality table:

[0040] Exterior

[0041] High-purity liquid sodium cyanide products are obtained through cooling and deployment; high-purity solid sodium cyanide products are obtained through concentration, crystallization and centrifugation of high-purity sodium cyanide aqueous solutions;

[0042] Solid sodium cyanide product quality table:

[0043] Exterior

[0044] The components of exhaust gas are as ...

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Abstract

The invention provides an environment-friendly clean production method for high purity sodium cyanide. The production method comprises the following steps that: without removal of ammonia, hydrocyanic acid synthetic gas synthesized through ammoxidation is directly absorbed by and reacts with an aqueous sodium hydroxide solution to obtain a high purity aqueous sodium cyanide solution, and free ammonia remains in tail gas; the aqueous sodium cyanide solution is cooled and blended to obtain a high purity liquid sodium cyanide product, the high purity liquid sodium cyanide product undergoes condensation, crystallization and centrifugation to obtain a high purity solid sodium cyanide product, and mother liquor is indiscriminately used in liquid alkali absorption liquor; phosphoric acid or ammonium biphosphate is employed as a carrier for repeated cyclic indiscriminate application of ammonia so as to recover ammonia in the tail gas; and after recovery of ammonia, the tail gas is purified and absorbed with water or the aqueous sodium hydroxide solution, a small amount of the aqueous hydrocyanic acid solution or a crude aqueous sodium cyanide solution product is obtained while the tail gas is purified, the purified tail gas is burned with a tail gas boiler, and the aqueous hydrocyanic acid solution or the crude aqueous sodium cyanide solution product is indiscriminately used in the liquid alkali absorption liquor.

Description

technical field [0001] A production method involving sodium cyanide refers to an environmentally friendly and clean process production method for obtaining high-purity sodium cyanide by directly reacting the mixed gas of hydrocyanic acid synthesized by ammonia oxidation with ammonia as the ammonia source, and directly reacting with aqueous sodium hydroxide solution. Considering the recovery and recycling of ammonia and the environmental protection of the process, it belongs to the technical method of circular economy, environmental protection and clean production. Background technique [0002] The reaction of ammoxidative synthesis of hydrocyanic acid is a well-known process. It uses ammonia and oxygen to convert organic matter that can be ammoxidized into hydrocyanic acid at high temperature in the presence of an ammonia oxidation catalyst; the technical value application of ammoxidative synthesis of hydrocyanic acid Wider range: there are mainly methane ammoxidation to pre...

Claims

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Application Information

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IPC IPC(8): C01C3/10
Inventor 龙智李宽义曾雯娟童有鹏
Owner 龙智
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