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Method for treating sodium hydroxide solution

A technology of sodium hydroxide and solution, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of long cycle, low efficiency, large evaporation and concentration, etc., and achieve simple operation Effect

Inactive Publication Date: 2014-01-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned processes generally have the following problems: (1) large amount of evaporation and concentration; (2) high energy consumption; (3) long cycle and low efficiency; (4) cumbersome recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Take 1000g of sodium hydroxide solution (the mass percentage of sodium hydroxide is 35%), add 650mL of acetone to the sodium hydroxide solution, stir while adding, continue to stir for 3 minutes after the addition, let it stand for 10 minutes, and separate the layers. The solution was 730g of concentrated sodium hydroxide solution (47.95% by mass of sodium hydroxide), the upper layer solution was distilled at 57°C, 649.7mL of distilled gas was collected, and the remaining aqueous solution was 270mL.

example 2

[0029] Take 1000g of sodium hydroxide solution (the mass percentage of sodium hydroxide is 35%), add 1950mL of acetone to the sodium hydroxide solution, stir while adding, continue to stir for 10min after the addition, let stand for 30min, separate layers, the lower layer The solution is 648g of concentrated sodium hydroxide solution (54% by mass of sodium hydroxide), the upper layer solution is distilled at 60°C, 1948.5mL of distilled gas is collected, and the remaining aqueous solution is 352mL.

example 3

[0031] Take 1000g of sodium hydroxide solution (the mass percentage of sodium hydroxide is 35%), add 800mL of acetone to the sodium hydroxide solution, stir while adding, continue to stir for 4 minutes after the addition, let stand for 8 minutes, and separate the layers. The solution is concentrated sodium hydroxide solution 710g (sodium hydroxide mass percentage is 49.3%), the upper solution is distilled at 62°C, 799.5mL of distilled gas is collected, and the remaining aqueous solution is 290mL.

[0032] In summary, the method of the present invention obtains a high-concentration sodium hydroxide solution by efficiently extracting water in a sodium hydroxide solution with an organic solvent, and simultaneously adopts low-boiling point evaporation and concentration to collect and recycle the organic solvent. It has the characteristics of simple operation, shortened evaporation treatment time and high concentration of sodium hydroxide solution.

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PUM

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Abstract

The invention provides a method for treating a sodium hydroxide solution. The method comprises the following steps: an organic solvent is added into a sodium hydroxide solution to be treated, and the extraction is performed, wherein the organic solvent can be soluble in water mutually and cannot dissolve sodium hydroxide; after layering, the high-concentration sodium hydroxide solution can be obtained through separation. According to the method provided by the invention, the organic solvent is added into the sodium hydroxide solution, sodium hydroxide and water are separated by utilizing the characteristics of mutual solubility of the organic solvent and an aqueous solution and non-solubility of sodium hydroxide in the organic solvent, and meanwhile the organic solvent can be recycled for use. The method has the characteristics of simplicity in operation, capability of shortening the evaporation treatment time and high concentration of the obtained sodium hydroxide solution.

Description

technical field [0001] The invention relates to the field of chemical industry, and more specifically relates to a method for increasing the concentration of sodium hydroxide solution. Background technique [0002] Sodium hydroxide is a commonly used chemical reagent, and electrolytic NaCl is generally used in industrial production. 2 prepared by the method, the laboratory can also use Ca(OH) 2 +NaCO 3 +H 2 O→NaOH+CaCO 3 ↓ prepared by the method. The sodium hydroxide solution therein reaches the required concentration range through evaporation and concentration. [0003] At present, the concentration of sodium hydroxide decreases after use in industry, and the way of recycling is to evaporate and concentrate the recovered sodium hydroxide aqueous solution to obtain the sodium hydroxide solution in the required concentration range. The above-mentioned processes generally have the following problems: (1) large amount of evaporation and concentration; (2) high energy cons...

Claims

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Application Information

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IPC IPC(8): C01D1/34
Inventor 伍珍秀孙朝晖杜光超高官金殷兆迁汪超
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP