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Preparation method for preparing alkali metal or alkali earth metal cyanide with high purity and high yield

A technology of alkaline earth metal and cyanide, applied in simple alkali metal cyanide, metal cyanide, chemical industry, etc., can solve the problem of high power consumption, and achieve the effect of high product purity, high production efficiency and simple process

Active Publication Date: 2012-06-20
NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium cyanide is produced by light oil cracking method. Light oil and ammonia need to be cracked at a high temperature of 1300-1500°C. The heat required is provided by the exothermic heat of three-phase electrodes, and the power consumption is extremely high. The power consumption per ton of sodium cyanide is about 3000KWH. It is a high-energy-consuming production process. At present, only the light oil cracking method is used in China to produce sodium cyanide.

Method used

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  • Preparation method for preparing alkali metal or alkali earth metal cyanide with high purity and high yield
  • Preparation method for preparing alkali metal or alkali earth metal cyanide with high purity and high yield
  • Preparation method for preparing alkali metal or alkali earth metal cyanide with high purity and high yield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In a set of industrial reaction device, natural gas, ammonia and air are reacted to synthesize HCN in the reactor by Angle’s method. The initial temperature of HCN synthesis gas is controlled at 150-200°C, and its main components are as follows:

[0044] components

N2

H2O

HCN

CO

NH3

CO2

H2

CH4

Mass fraction / wt%

64.42

18.51

8.52

4.45

1.73

1.37

0.84

0.16

[0045] A kind of adopting above-mentioned HCN synthesis gas to prepare sodium cyanide, hydroxyacetonitrile: add 5m in advance in the sodium cyanide circulation tank 4 The liquid sodium cyanide product, after testing liquid sodium cyanide content is 30.53%wt; Add 2m3 industrial formaldehyde in the acetonitrile circulation tank in advance, and the content of formaldehyde is 37%wt after testing.

[0046] Start the sodium cyanide circulation pump for circulation, and start the hydroxyacetonitrile pu...

Embodiment 2～7

[0050] Embodiment 2~7: be continuous production process, make sodium cyanide or potassium cyanide by following steps and process, all the other are with embodiment 1.

[0051]

[0052]

[0053] In the sodium cyanide or potassium cyanide liquid product that makes by example 2~7, sodium carbonate or salt of wormwood content have been controlled at extremely low level, at 0.30~0.45%wt, sodium hydroxide or potassium hydroxide (free alkali ) content is controlled at 0.2-0.8%wt, sodium formate or potassium formate is controlled at 0.1-0.15%wt, the product sodium cyanide or potassium cyanide is at 20-40%wt, and the product has good quality and high purity.

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Abstract

The invention relates to a preparation method for preparing alkali metal or alkali earth metal cyanide with high purity and high yield, which comprises the following steps of: mixing, absorbing and reacting HCN (hydrogen cyanide) synthetic gas synthesized by an Andrussow method with absorption liquid containing alkali and then carrying out gas-liquid separation and cooling to prepare the alkali metal or the alkali earth metal cyanide. The absorption and reaction contact time of the HCN synthetic gas with the absorption liquid containing the alkali can be controlled within 0.1-2.0 seconds; the concentration of free alkali in the absorption liquid containing the alkali can be controlled within 0.1-20 percent by weight; and the mass ratio of circulation fluid of the cyanide to product liquid is 2-40:1. The invention has the beneficial effects that the alkali metal or the alkali earth metal cyanide prepared by the preparation method is high in purity; the total content of carbonate can be controlled within below 0.45 percent by weight, the content of formate can be controlled within below 0.15 percent by weight, and the content of ocyhydrate (free alkali) can be controlled within 0.1-2.0 percent by weight; and the alkali metal or the alkali earth metal cyanide is good in color and is colorless transparent liquid.

Description

technical field [0001] The invention relates to a method for preparing alkali metal or alkaline earth metal cyanides with high purity and high yield, in particular to a method for preparing alkali metal or alkaline earth metal cyanides from hydrocyanic acid synthesis gas prepared by the Angle method, which belongs to chemical production field. Background technique [0002] Alkali metal or alkaline earth metal cyanide mainly includes sodium cyanide, potassium cyanide, calcium cyanide, etc. Among them, sodium cyanide and potassium cyanide, as an important chemical product, have multiple uses and can be widely used in electroplating, metal Surface treatment, extraction and recovery of precious metals, manufacture of pesticides, organic synthesis, heat treatment, etc. The products are liquid and solid. Potassium cyanide and calcium cyanide are often used in gold mines and rare metal smelting industries. [0003] At present, the production process of alkali metal cyanide or alka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/08C01C3/10
CPCY02P20/10
Inventor 郑道敏郑伯川孙文兵方善伦陶继强徐代行刘希望何铁春杨平
Owner NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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