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Method for removing iron ions from sodium thiomethoxide solution

A technology of sodium methyl mercaptide and iron ions, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as reddening, removal of iron ions, and insignificant effects, and achieve cost reduction and simple operation. Effect

Active Publication Date: 2013-10-16
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Directly adding reducing agents such as hydrosulfite or thiourea dioxide, although it can remain colorless for 8 hours, it turns red again after 8 hours
However, other existing complexing agents or reducing agents have no obvious effect under this alkaline condition, and cannot achieve a good effect of removing iron ions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Add 100.12g of sodium methyl mercaptide solution (mass fraction about 20%) and 3.33g of complexing agent triethanolamine into a 250mL four-neck flask equipped with a stirrer and a thermometer. After sealing, start stirring while raising the temperature, and when the temperature reaches 60°C, stir for 24 hours.

[0022] (2) Stop stirring, let it settle for 8 hours at 15°C, filter, and the filtrate is the product.

[0023] The obtained sodium methyl mercaptide solution is colorless and transparent, and does not turn red after exposure to air. The content of sodium methyl mercaptide in the raw material is 21.98%, the content of sodium hydroxide is 0.7%, and the concentration of iron ions is 79ppm; the content of sodium mercaptan after treatment is 21.41%, the content of sodium hydroxide is 0.95%, and the concentration of iron ions is 6.9ppm.

Embodiment 2

[0025] (1) Add 100.12g of sodium methyl mercaptide solution (mass fraction about 20%) and 1.01g of complexing agent triethanolamine into a 250mL four-neck flask equipped with a stirrer and a thermometer. After sealing, start stirring while raising the temperature. When the temperature reaches 50° C., stir for 1 hour.

[0026] (2) Stop stirring, let it settle at 25°C for 8 hours, filter, and the filtrate is the product.

[0027] The obtained sodium methyl mercaptide solution is colorless and transparent, and does not turn red after exposure to air. The content of sodium methyl mercaptide in the raw material is 21.98%, the content of sodium hydroxide is 0.7%, and the concentration of iron ions is 164ppm; the content of sodium mercaptan after treatment is 21.89%, the content of sodium hydroxide is 0.85%, and the concentration of iron ions is 1.92ppm.

Embodiment 3

[0029] (1) Add 100.23g of sodium methyl mercaptide solution (mass fraction about 20%) and 0.5g of complexing agent triethanolamine into a 250mL four-neck flask equipped with a stirrer and a thermometer. After sealing, start stirring while raising the temperature. When the temperature reaches 30° C., stir for 1 hour.

[0030] (2) Stop stirring, let it settle at 30°C for 8 hours, filter, and the filtrate is the product.

[0031] The obtained sodium methyl mercaptide solution was colorless and slightly yellowish, and no longer turned red after exposure to air. The content of sodium methyl mercaptide in the raw material is 21.98%, the content of sodium hydroxide is 0.7%, and the concentration of iron ions is 88ppm; the content of sodium mercaptan after treatment is 21.39%, the content of sodium hydroxide is 0.77%, and the concentration of iron ions is 9.75ppm.

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PUM

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Abstract

The invention discloses a method for removing iron ions from a sodium thiomethoxide solution. The method for removing iron ions from the sodium thiomethoxide solution comprises the following steps: adding appropriate complexing agent iron ions into an alkaline solution, heating to a certain temperature, stirring at constant temperature for an appropriate period of time, standing, settling for a certain period of time and filtrating. The iron ion content in the alkaline solution treated by the method is obviously reduced, namely the solution is changed from red to be colorless and transparent, does not become red any longer after exposure to air and has an basically unchanged content. The method for removing iron ions from the sodium thiomethoxide solution is easy to operate, readily available in raw materials, and is applicable to industrial treatment.

Description

technical field [0001] The invention relates to a method for removing iron ions in a solution, in particular to a method for removing iron ions in a sodium methylmercaptan solution. Background technique [0002] Sodium methyl mercaptide is a colorless and transparent liquid with an odor, and is a strong alkaline liquid. It can be used as a raw material for pesticides, medicines, and pigment intermediates, such as pesticides xicaomin, methomyl, and organic intermediates. Raw materials; food additives methionine, vitamin U, raw materials for rubber vulcanizing agents; antidotes for hydrogen sulfide poisoning; odorants for gas and natural gas, etc. [0003] The unique strong reducibility of sodium methyl mercaptide itself, coupled with the contact with iron-containing containers, reactors, pipelines, etc. during the production process, can easily generate a red sodium methyl mercaptide solution containing traces of iron ions. When the iron ion concentration is 58-164ppm, the s...

Claims

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Application Information

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IPC IPC(8): C07C319/28C07C321/04
Inventor 刘龙飞许倩倩王肖张建林吴志红
Owner CHAMBROAD CHEM IND RES INST CO LTD
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