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Method for detecting barium content in barium stearate via precipitation method

A technology for barium stearate and barium content, which is applied in the direction of removing certain components and weighing, etc., can solve the problems of consumption of sulfuric acid, impure caustic soda, irregular production process, etc., and achieves easy operation, simple method and high content. accurate effect

Inactive Publication Date: 2013-03-20
FAR EAST CABLE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under the market economy, the production process of barium stearate is not standardized, and the residual caustic soda in the produced barium stearate is not washed clean, which will consume the amount of sulfuric acid titrated during the test, resulting in a virtual barium content
Also, the used 30% caustic soda is impure, if it contains calcium hydroxide, it will produce calcium stearate, and the calcium stearate reacts with the sulfuric acid during detection to produce calcium sulfate and stearic acid. Calcium sulfide is soluble in water and will consume The amount of sulfuric acid titrated during detection also produces a virtual barium content
Therefore, the use of HG2338-92 barium stearate (light) chemical industry standard has been unable to accurately detect the true barium content in barium stearate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Accurately take by weighing 1g (accurate to 0.0001g) barium stearate, put into clean reactor, with the excess sulfuric acid of known concentration, stir reaction 0.5 hour and react with the barium in barium stearate to generate barium sulfate precipitation, use Sodium hydroxide neutralizes the excess sulfuric acid to a pH value of 7, filter the precipitated barium sulfate and separated stearic acid with filter paper, put the filtrate in the filter paper into a muffle furnace for calcination at 700°C, and burn to remove the filter paper, Water, stearic acid 1 hour, the remaining barium sulfate after burning accurately weighs 0.3412g, calculates the content=(137.33*0.3412 / 233.39*1.0000)*100%=20.08% that barium accounts for barium stearate in barium sulfate.

Embodiment 2

[0017] Accurately take by weighing 10g (accurate to 0.0001g) barium stearate, put into clean reactor, with the excess sulfuric acid of known concentration, stir reaction 1 hour and react with the barium in barium stearate to generate barium sulfate precipitation, use Sodium hydroxide neutralizes the excess sulfuric acid to a pH value of 7, filter the precipitated barium sulfate and separated stearic acid with filter paper, put the filtrate in the filter paper into a muffle furnace for calcination at 700°C, and burn to remove the filter paper, Water, stearic acid 1.5 hours, the remaining barium sulfate after burning accurately weighs 3.4452g, calculates the content=(137.33*3.4452 / 233.39*10.0000)*100%=20.27% that barium accounts for barium stearate in barium sulfate.

Embodiment 3

[0019] Accurately take by weighing 10g (accurate to 0.0001g) barium stearate, put into clean reactor, with the excess sulfuric acid of known concentration, stir reaction 2 hours and react with the barium in barium stearate to generate barium sulfate precipitation, use Sodium hydroxide neutralizes the excess sulfuric acid to a pH value of 7, filter the precipitated barium sulfate and separated stearic acid with filter paper, put the filtrate in the filter paper into a muffle furnace for calcination at 700°C, and burn to remove the filter paper, Water, stearic acid 2 hours, the remaining barium sulfate after burning accurately weighs 3.4326g, calculates the content=(137.33*3.4326 / 233.39*10.0000)*100%=20.19% that barium accounts for barium stearate in barium sulfate.

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Abstract

The invention relates to a method for detecting barium content in barium stearate via a precipitation method. The method comprises the steps of weighing the barium stearate accurately, titrating with a acid-base titration method, collecting precipitated barium sulfate, weighing the barium sulfate after being burned; and then calculating the barium content in the barium stearate. The method is simple and easy to operate. The detected barium content is accurate and reliable.

Description

technical field [0001] The invention relates to a method for detecting barium content in barium stearate, in particular to a method for detecting barium content in barium stearate by precipitation method. Background technique [0002] Barium stearate [Ba(C17H35COO)2], also known as barium octadecanoate, is insoluble in water but soluble in hot ethanol, and decomposes into stearic acid and the corresponding barium salt in case of inorganic acid. Barium stearate is used as a light-resistant and heat-resistant stabilizer for PVC cable materials, as a plasticizer for rubber products, etc. The production process is that the stearic acid is put into a reaction barrel and heated and melted in a water bath, and then 30% caustic soda is added for saponification to generate an aqueous solution of sodium stearate. Then, add barium chloride solution under stirring, carry out metathesis reaction, generate barium stearate and sodium chloride. After the reaction is complete, barium stear...

Claims

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Application Information

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IPC IPC(8): G01N5/04
Inventor 顾坤林
Owner FAR EAST CABLE
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