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Method for purification of sodium bromate by energy-saving method

A technology of sodium bromate and sulfate, which is applied in the direction of bromine oxy compounds, can solve the problems of poor color treatment effect, more steam consumption, and low purity, and achieve the effects of good product color, water saving, and steam saving

Inactive Publication Date: 2009-03-25
潍坊强源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the purification method of sodium bromate generally adopts the method of dissolving at room temperature, adding activated carbon for decolorization, filtering, and distilling and concentrating. The disadvantage of this method is that the water consumption for dissolving at room temperature is large, and recrystallization requires secondary evaporation and concentration, and more consumption is required for evaporation and concentration. Steam, cannot remove sulfates, heavy metal components, poor color treatment, low purity

Method used

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  • Method for purification of sodium bromate by energy-saving method
  • Method for purification of sodium bromate by energy-saving method
  • Method for purification of sodium bromate by energy-saving method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Pour 1000L of deionized water into a 2000L glass-lined reactor with a stirrer (called No. 1 kettle), then add 75 kg of crude product sodium bromate to the reactor, stir and heat up to 90 degrees at the same time. The sodium bromate was completely dissolved.

[0018] 2. Add 4.5 kg of barium hydroxide, 1.2 kg of 80-mesh chitosan, and 4 kg of activated carbon into the reaction kettle, stir and dissolve for 50 minutes, so that the sulfate radical is precipitated as barium sulfate salt, the color is absorbed by activated carbon and chitosan, and the heavy metal is absorbed. Chitosan adsorption and chelation.

[0019] 3. Filter the feed liquid quickly through a filter with a 200-mesh filter cloth, and then pass through a sand filter for a second time and then transfer it to another 2000L glass-lined reaction kettle with a 30 rpm stirrer (No. 2 kettle) .

[0020] 4. Put circulating water into the jacket to cool, and start stirring at the same time, until the temperature o...

Embodiment 2

[0029] 1. Pour 1000L of deionized water into a 2000L glass-lined reactor with agitator (called No. 1 kettle), then add 75 kg of sodium bromate to be purified into the reactor, stir and heat up to 88 degree to completely dissolve the sodium bromate.

[0030] 2. Add 5.5 kg of barium hydroxide, 1.8 kg of 80-mesh chitosan, and 2.6 kg of activated carbon into the reaction kettle, stir and dissolve for 40 minutes, so that the sulfate radical is precipitated as barium sulfate salt, the color is absorbed by activated carbon and chitosan, and the heavy metal is absorbed. Chitosan adsorption and chelation.

[0031] 3. Filter the feed liquid quickly through a filter with a 150-mesh filter cloth, and then pass through a sand filter for a second time and then transfer it to another 2000L glass-lined reaction kettle with a 30 rpm stirrer (No. 2 kettle) .

[0032] 4. Put circulating water into the jacket to cool, and start stirring at the same time until the temperature of the feed liquid ...

Embodiment 3

[0041] 1. Pour 1000L deionized water into a 2000L glass-lined reactor with a stirrer (called No. 1 kettle), then add 75 kg of sodium bromate to be purified into the reactor, stir and heat up to 85 degree to completely dissolve the sodium bromate.

[0042] 2. Add 4.0 kg of barium hydroxide, 1.5 kg of 80-mesh chitosan, and 3.0 kg of activated carbon into the reaction kettle, stir and dissolve for 45 minutes, so that the sulfate radical is precipitated as barium sulfate salt, the color is absorbed by activated carbon and chitosan, and the heavy metal is absorbed. Chitosan adsorption and chelation.

[0043] 3. Filter the feed liquid quickly through a filter with a 180-mesh filter cloth, and then pass through a sand filter for a second time and then transfer it to another 2000L glass-lined reaction kettle with a 35 rpm stirrer (No. 2 kettle) .

[0044] 4. Put the circulating water into the jacket to cool, and start stirring at the same time, until the temperature of the material ...

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Abstract

The invention relates to an energy-conserving sodium bromate purifying method. The method includes the following steps: (1) the raw sodium bromate is dissolved; (2) barium hydroxide, chitosan and active carbon are added and then the solution is stirred and dissolved for 40 to 50 minutes to lead sulfate to be separated out in the barium sulfate salt form, the color to be absorbed by active carbon and the chitosan and heavy metals to be absorbed and chelated by the chitosan; (3) the solution is filtered; (4) the solution is cooled and stirred; (5) solids and liquid are separated under eccentric effect; (6) after the separation between solids and liquid, the liquid is replaced into the No1 reaction kettle and the steps are repeated. The method is characterized in that: dissolving degree of the sodium bromate under special temperatures is utilized to obtain the corresponding supersaturate solution and then the required product can be obtained through decoloring, impurity-removing, filtering, cooling, crystallizing and drying. Compared with the prior purifying method, the method has the advantages that second-time evaporation is avoided; water and stream can be conserved; the color of product is better, the purity is high and the like. The method is ideal for the bromate purification in the modern industrial manufacturing.

Description

technical field [0001] The invention relates to a method for purifying sodium bromate, in particular to an energy-saving method for purifying sodium bromate. Background technique [0002] At present, the purification method of sodium bromate generally adopts the method of dissolving at room temperature, adding activated carbon for decolorization, filtering, and distilling and concentrating. The disadvantage of this method is that the water consumption for dissolving at room temperature is large, and recrystallization requires secondary evaporation and concentration, and more consumption is required for evaporation and concentration. Steam, cannot remove sulfate, heavy metal components, poor color treatment effect, low purity. Contents of the invention [0003] In order to solve the deficiencies in the prior art, the invention discloses an energy-saving method for purifying sodium bromate, which does not require secondary evaporation, has good energy-saving effect, high pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/20
Inventor 石勇刘英军刘兴祥袁义信袁彦明
Owner 潍坊强源化工有限公司
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