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Method for purifying antioxidant 2,4-di(n-octyl sulfur methylene)-6-methylphenol

A purification method and technology for antioxidants, which are applied in the field of purification of antioxidants, can solve problems such as color and product odor, and achieve the effects of high quality and simple technical operation.

Inactive Publication Date: 2017-12-15
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But existing method exists the crude product 2,4-bis(n-octylsulfanyl)-6-methylphenol that generates has color, and because mercaptan residue causes product to have the deficiency of these respects of odor

Method used

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  • Method for purifying antioxidant 2,4-di(n-octyl sulfur methylene)-6-methylphenol
  • Method for purifying antioxidant 2,4-di(n-octyl sulfur methylene)-6-methylphenol
  • Method for purifying antioxidant 2,4-di(n-octyl sulfur methylene)-6-methylphenol

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The experiment used the PL-60220 molecular distillation device produced by POPE Company of the United States, as shown in the accompanying drawing. All parts of the whole set of equipment are connected well, and 245.01g of crude product is added in the feed tank. Close all passages to the atmosphere. Turn on the corresponding power supply, and the cooling water of the condenser plate and the cold well condenser.

[0025] Turn on the vacuum system, set the temperature of the heating plate, the preheating temperatures of the feed tank materials are 80°C and 50°C respectively, and the rotating speed of the rotary wiper is 380r / min. When the vacuum degree is maintained at about 1.33kPa, the raw materials are added dropwise, and after 3 minutes, the product flows out from the heavy component outlet, maintaining a stable drop rate. After 45 minutes, the dropwise addition of the material was completed. The molecular distillation device continued to operate for 15 minutes. ...

Embodiment 2

[0028] The experiment used the PL-60220 molecular distillation device produced by POPE Company of the United States, as shown in the accompanying drawing. All parts of the whole set of equipment are connected well, and 135.0g of crude product is added in the feeding tank. Close all passages to the atmosphere. Turn on the corresponding power supply, and the cooling water of the condenser plate and the cold well condenser.

[0029] Turn on the vacuum system, set the temperature of the heating plate, the preheating temperatures of the feed tank materials are 80°C and 50°C respectively, and the rotating speed of the rotary wiper is 380r / min. When the vacuum degree is maintained at about 1.33kPa, the raw materials are added dropwise, and after 4 minutes, the product flows out from the heavy component outlet, maintaining a stable drop rate. After 27 minutes, the dropwise addition of the material was completed. The molecular distillation device continued to operate for 15 minutes....

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Abstract

The invention relates to a method for purifying antioxidant 2,4-di(n-octyl sulfur methylene)-6-methylphenol, that is, a crude product of 2,4-di(n-octyl sulfur methylene)-6-methylphenol of which components with low melting points are removed is decolored and deodorized to remove mercaptan odor by using a molecular distillation device, and then a product which is colorless and transparent and free of odor of n-octyl mercaptan is prepared.

Description

technical field [0001] The present invention relates to a method for purifying antioxidants, specifically a method for purifying liquid hindered phenolic antioxidants 2,4-bis(n-octylthiomethylene)-6-methylphenol using a molecular distillation method . Background technique [0002] The antioxidant 2,4-bis(n-octylthiomethylene)-6-methylphenol, also known as antioxidant 1520, has the molecular formula C 25 h 44 OS 2 , the structural formula is as follows: [0003] [0004] 2,4-bis(n-octylthiomethylene)-6-methylphenol is a hindered phenolic antioxidant containing a thiol alkyl group, which has two functional groups of thioether and hindered phenol in its structure. Two types of groups with synergistic effect together provide antioxidant effect. 2,4-bis(n-octylthiomethylene)-6-methylphenol has the advantages of low toxicity, strong compatibility, and small color pollution; its volatility is very low, and it has strong Extremely low volatile consumption, therefore, its ap...

Claims

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Application Information

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IPC IPC(8): C07C323/16C07C319/28
CPCC07C319/28C07C323/16
Inventor 林富荣周海军仲艳艳
Owner CHANGZHOU UNIV
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