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Method of separating multi-ammonium compound salt

A separation method and technology of compound salt, which are applied in the preparation of ammonium salt, ammonium sulfate, thiosulfate/dithionite/polythionite, etc., can solve the problem of not described in detail and the purity is not very ideal. and other problems to achieve the effect of ensuring the separation effect

Inactive Publication Date: 2007-08-08
苏州久王环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The scope of application of this method has certain limitations, after separation (NH 4 ) 2 S 2 o 3 and NH 4 The purity of CNS is not very ideal, and some operating conditions are not described in detail, especially for (NH 4 ) 2 S 2 o 3 , NH 4 CNS and (NH 4 ) 2 SO 4 In the case of coexistence, how to separate one of them, etc., has not been disclosed

Method used

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  • Method of separating multi-ammonium compound salt
  • Method of separating multi-ammonium compound salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Polyammonium compound salt 1135g, which contains: NH 4 CNS, 37.62%; (NH 4 ) 2 S 2 o 3 , 46.66%; (NH 4 ) 2 SO 4 , 6.73%; H 2 O, 8.99%. Add 85g of water, dissolve at 70°C-80°C, and obtain 629ml of solution and 340g of solid through liquid-solid separation. The solution contains: NH 4 CNS, 51.16%, (NH 4 ) 2 S 2 o 3 , 27.22%, (NH 4 ) 2 SO 4 , 3.19%; solid contains: NH 4 CNS, 4.48%, (NH 4 ) 2 S 2 o 3 , 75.15%, (NH 4 ) 2 SO 4 , 11.59%.

[0038] The above 629ml solution was added with 135g of finished washing liquid, cooled to 25°C, and 141.6g of ammonium thiocyanate solid was obtained through liquid-solid separation, which contained: NH 4 CNS, 96.72%, (NH 4 ) 2 S 2 o 3 , 0.13%, (NH 4 ) 2 SO 4 , 0.42%, the separated mother liquor returns to dissolve the compound salt or evaporates; the above 340g solid is added with 65g of water, and an appropriate amount of ammonia is added as a stabilizer, dissolved below 95°C, and 257ml of the solution is obta...

Embodiment 2

[0040] Polyammonium compound salt 1000g, which contains: NH 4 CNS, 58.12%; (NH 4 ) 2 S 2 o 3 , 20.48%; (NH 4 ) 2 SO 4 , 12.72%; H 2 O, 8.68%. Add 660g of mother liquor, dissolve at 60°C-70°C, and obtain 1113ml of solution and 249g of solid through liquid-solid separation. The solution contains: NH 4 CNS, 53.42%, (NH 4 ) 2 S 2 o 3 , 22.33%, (NH 4 ) 2 SO 4 , 3.42%; solid contains: NH 4 CNS, 20.74%, (NH 4 ) 2 S 2 o 3 , 10.54%, (NH 4 ) 2 SO 4 , 54.40%.

[0041] The above 1113ml solution was added with 60g of finished washing liquid, cooled to 25°C, and 263.5g of ammonium thiocyanate solid was obtained through liquid-solid separation, which contained: NH 4 CNS, 97.52%, (NH 4 ) 2 S 2 o 3 , 0.07%, (NH 4 ) 2 SO 4 , 0.08%, the separated mother liquor returns to dissolve the compound salt; the above-mentioned 249g solid is added with 35ml of water, dissolved at 30°C-40°C, separated from liquid to solid at normal temperature, to obtain 111.07g of ammonium s...

Embodiment 3

[0043] Polyammonium compound salt 500g, which contains: NH 4 CNS, 47.44%; (NH 4 ) 2 S 2 o 3 , 26.81%; (NH 4 ) 2 SO 4 , 16.54%. Add 360g of mother liquor, dissolve at 60°C-80°C, and obtain 570ml of solution and 129g of solid through liquid-solid separation. The solution contains: NH 4 CNS, 47.85%, (NH 4 ) 2 S 2 o 3 , 27.04%, (NH 4 ) 2 SO 4 , 2.51%; solid contains: NH 4 CNS, 24.24%, (NH 4 ) 2 S 2 o 3 , 18.83%, (NH 4 ) 2 SO 4 , 47.46%.

[0044] The above 570ml solution was added with 84g of finished washing liquid, cooled to 30°C, and 96.7g of solid ammonium thiocyanate was obtained through liquid-solid separation, which contained: NH 4 CNS, 97.32%, (NH 4 ) 2 S 2 o 3 , 0.4%, (NH 4 ) 2 SO 4 , 0.38%, the separated mother liquor returns to dissolve the compound salt; the above-mentioned 129g solid adds 18ml of water, dissolves at 30°C-40°C, and separates the liquid and solid at normal temperature to obtain 49.5g of ammonium sulfate solid, which contains...

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Abstract

The invention discloses a separating method of multi-ammonia composite salt, which comprises the following steps: separating ammonia thiocyanate under low temperature (0-25 deg.c); enriching ammonium thiosulfate and ammonium sulfate under middle temperature (40-65 deg.c); separating ammonium sulfate under high temperature (80-90 deg.c); separating enriched ammonium thiosulfate at 20-40 deg.c; dissolving, crystallizing and separating solid from liquid for several times under different temperature to separate ammonium thiocyanate, ammonium thiosulfate and ammonium sulfate one by one.

Description

technical field [0001] The invention relates to the separation of polyammonium compound salts, in particular to a subsequent separation method for polyammonium compound salts recovered from coke oven gas HPF desulfurization and decyanation wastewater, and belongs to the technical field of separation and recovery of industrial wastewater. Background technique [0002] With the improvement of living standards year by year, people's requirements for quality of life and living environment are also getting higher and higher. Environmental protection is widely valued, all walks of life continue to strengthen the treatment of "three wastes", and the country also puts forward new requirements for green GDP, striving to achieve circular economy, comprehensive utilization, continuously improve production efficiency, and reduce waste of resources. [0003] The HPF method (ammonia liquid phase catalytic method) is a method with high efficiency for desulfurization and decyanation of coke...

Claims

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Application Information

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IPC IPC(8): C01C1/28C01B17/64C01C1/24C01C3/20
Inventor 王宏明
Owner 苏州久王环保科技股份有限公司
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