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Method for separating sodium chloride and sodium bromide by organic solvent

An organic solvent and sodium bromide technology, applied in the field of separation of halogen salts, can solve the problems of high energy consumption, low yield, and difficulty in obtaining pure products, and achieve low operating costs, high recovery rate, and simple separation equipment Effect

Inactive Publication Date: 2019-03-08
山东金城晖瑞环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is difficult to obtain pure products, it needs repeated recrystallization, and the yield is low, and the energy consumption in the separation process is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Get the mixed salt of analytical pure reagent sodium chloride and sodium bromide, sodium bromide accounts for 70% of the mixed salt quality, add 4 times of anhydrous methanol, stir at room temperature for 2 hours, filter, filter out the insoluble solid, the solid packed for later use;

[0038] (2) Put the filtrate in the step (1) into the evaporator, heat up and evaporate, the solution temperature in the evaporator is 75°C, and the top temperature is 62°C;

[0039] (3) steam out about 20% of methanol, cool down to 20°C, filter, filter out the crystalline salt, and pack the salt for future use;

[0040] (4) the filtrate in the step (3) is squeezed into the evaporator, and continues to heat up and evaporate;

[0041] (5) steam about 80% of methanol, cool to 20° C., filter to obtain finished product sodium bromide, and apply the filtrate mechanically to the filtrate of the next batch of steps (3);

[0042] (6) Repeat the above steps with the filtered salt in steps (1...

Embodiment 2

[0046] (1) Get the company's cyclization waste salt, mainly sodium chloride and sodium bromide, also contain a small amount of sodium carbonate and sodium sulfate, sodium bromide accounts for 80% of the mixed salt quality, add 5 times of methanol, stir at room temperature for 2 Hour; Filter, filter out insoluble solid, this solid is packed for subsequent use;

[0047] (2) Put the filtrate in the step (1) into the evaporator, heat up and evaporate, the solution temperature in the evaporator is 80°C, and the top temperature is 64°C;

[0048] (3) steam about 30% of methanol, cool down to 20°C, filter, filter out the crystalline salt, and pack the salt for future use;

[0049] (4) the filtrate in the step (3) is squeezed into the evaporator, and continues to heat up and evaporate;

[0050] (5) steam about 70% of methanol, cool to 20°C, filter to obtain finished product sodium bromide, and apply the filtrate to the filtrate of the next batch of steps (3);

[0051] (6) Repeat the ...

Embodiment 3

[0055] (1) Get the mixed salt of analytical pure reagent sodium chloride and sodium bromide, sodium bromide accounts for 75% of the mixed salt quality, add 4.5 times of anhydrous methanol, stir at room temperature for 2 hours, filter, filter out the insoluble solid, the solid packed for later use;

[0056] (2) Put the filtrate in the step (1) into the evaporator, heat up and evaporate, the solution temperature in the evaporator is 70°C, and the top temperature is 60°C;

[0057] (3) steam out about 20% of methanol, cool down to 20°C, filter, filter out the crystalline salt, and pack the salt for future use;

[0058] (4) the filtrate in the step (3) is squeezed into the evaporator, and continues to heat up and evaporate;

[0059](5) steam about 80% of methanol, cool to 20° C., filter to obtain finished product sodium bromide, and apply the filtrate mechanically to the filtrate of the next batch of steps (3);

[0060] (6) Repeat the above steps with the filtered salt in steps (...

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Abstract

The invention belongs to the technical field of halogen element salt separation, and particularly relates to a method for separating sodium chloride and sodium bromide by an organic solvent. The organic solvent is added into dry sodium chloride and sodium bromide mixed salt; stirring dissolution is performed at normal temperature; filtering is performed; undissolved salt is filtered out; filteringliquid is heated to be evaporated; methanol is evaporated out; the temperature is lowered for crystallization; filtering is performed; crystallized salt is filtered out; the content of sodium bromidein the salt reaches 90 weight percent or higher; the filtering liquid is continuously heated and evaporated; the rest methanol is evaporated out; the temperature is lowered for filtering; a finishedproduct sodium bromide salt is obtained; all evaporation recovered methanol is used again for next batch of dissolving salt. The method for separating sodium chloride and sodium bromide by the organicsolvent has the advantages that the separation equipment is simple; the operation cost is low; the process is reasonable; the realization is easy; the recovery rate is high; no waste water is generated; no environment pollution exists; the industrialization can be easily realized.

Description

technical field [0001] The invention belongs to the technical field of separation of halogen element salts, and in particular relates to a method for separating sodium chloride and sodium bromide with an organic solvent. Background technique [0002] Halogen salt is an extremely important industrial raw material, especially sodium chloride and sodium bromide are widely used, sodium chloride is used in the inorganic and organic industries to manufacture chlorine, hydrogen, hydrochloric acid, soda ash, caustic soda, chlorate, bleaching powder Raw materials for refrigeration systems, raw materials for organic synthesis and salting-out agents, used as heat treatment agents in the iron and steel industry, for tanning leather in the tanning industry, and for salting-out soap production in the soap making industry; essential to human life Necessities of life; medically, highly refined sodium chloride can be used to make saline, etc., widely used in clinical treatment and physiologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/18C01D3/10C01D3/04
CPCC01D3/04C01D3/10C01D3/18C01P2006/80
Inventor 刘桂昌陈左林周国勇
Owner 山东金城晖瑞环保科技有限公司
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