Process for preparing tetra-benzyl thiram disulfide

A technology of tetrabenzylthiuram disulfide and carbon disulfide, applied in the direction of organic chemistry, etc., can solve the problems of unsuitable tetrabenzylthiuram disulfide, high equipment requirements, unfavorable environmental protection, etc., and achieve easy industrial implementation and environmental protection No pollution, easy operation effect

Inactive Publication Date: 2006-09-06
乐清超微细投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are significant defects in the above-mentioned method, and the process condition in Chinese Patent Publication No. CN1341097A needs certain pressure, and the requirement to equipment is higher; Use isopropanol as solvent in Patent Publication No. CN1316422A, and cost is higher and is unfavorable for environmental protection, therefore Not suitable for the preparation of tetrabenzylthiuram disulfide

Method used

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  • Process for preparing tetra-benzyl thiram disulfide
  • Process for preparing tetra-benzyl thiram disulfide
  • Process for preparing tetra-benzyl thiram disulfide

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Add 10.1g of sodium hydroxide and 300g of water into the reactor and stir to dissolve, then add 49.3g of dibenzylamine, stir evenly, start to add 20g of carbon disulfide dropwise, control the reaction temperature at 40°C, and continue stirring for 4h after the dropwise addition is completed. Dilute 19g of 27.5% hydrogen peroxide to 100g with water, and dilute 16g of 98% sulfuric acid to 200g with water, then add sulfuric acid and hydrogen peroxide dropwise at the same time, and control the temperature at 65°C. The pale yellow precipitate was filtered and dried to obtain 65 g of tetrabenzylthiuram disulfide. The yield is 95%, and the product purity is 97%.

Embodiment 2

[0022] Add 10.1g of sodium hydroxide and 300g of water into the reactor and stir to dissolve, then add 49.3g of dibenzylamine, stir evenly, start to add 20g of carbon disulfide dropwise, control the reaction temperature at 40°C, and continue stirring for 2h after the dropwise addition is completed. 6g of sodium hypochlorite is formulated into a solution with a concentration of 6%, and 16g of sulfuric acid with a concentration of 98% is diluted to 200g with water, then the solution of sulfuric acid and sodium hypochlorite is added dropwise at the same time, and the temperature is controlled at 55°C. After the dropwise addition, the generated The pale yellow precipitate was filtered and dried to obtain 62 g of tetrabenzylthiuram disulfide.

[0023] The yield is 91%, and the product purity is 97%.

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Abstract

The invention relates to a method for preparation of tetrabenzylthiuram disulfide. The said method includes the following steps: adding the carbon bisulphide into the mixture of dibenzylamine and caustic lye of soda, reacting, afterwards, adding oxidant and sulfuric acid solution simultaneously, reacting, collecting the said tetrabenzylthiuram disulfide from the reaction products. The method of this invention is of simple operation, moderate reaction condition, high purity of the product, so it is suitable for industrial administration.

Description

technical field [0001] The invention relates to a method for preparing tetrabenzylthiuram disulfide, in particular to a method for preparing tetrabenzylthiuram disulfide in the presence of dibenzylamine, sodium hydroxide and carbon disulfide in the presence of hydrogen peroxide and acid. Background technique [0002] Tetrabenzylthiuram disulfide is generally abbreviated as TBzTD, and its structural formula is: [0003] [0004] TBzTD is a rubber vulcanization accelerator with excellent performance. It is based on high molecular weight, low volatility secondary amines that do not generate nitrosamines as easily as low molecular weight secondary amines. Therefore, it has better processing safety and has a longer scorch time than tetramethylthiuram disulfide (TMTD), and can replace TMTD as the main accelerator for rapid vulcanization of natural rubber, nitrile rubber and styrene-butadiene rubber Or co-accelerator, can effectively improve the vulcanization efficiency and vu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C333/32
Inventor 连加松连千荣周文平丁林
Owner 乐清超微细投资有限公司
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