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A method of reclaiming tdec

A technology of alkaline conditions and leaching solution, applied in the direction of organic chemistry, etc., can solve the problems of improper operation of harmful gases, complicated preparation process, serious solid waste discharge, etc., and achieve the effect of simple and easy preparation process, reducing environmental hazards and reducing emissions

Active Publication Date: 2019-06-25
昆明先导新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this preparation method, raw materials such as pure tellurium and tellurium oxide are expensive, and the preparation process is complex and demanding, and improper operation may easily cause harmful gas generation.
In addition, it is inevitable that a large amount of TDEC waste will be generated during the preparation of TDEC, and the discharge of solid waste is serious.

Method used

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  • A method of reclaiming tdec

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 500mL of water and 10g of industrial-grade sodium hydroxide to 100g of TDEC waste, stir and impregnate at 90°C for 4 hours, filter and separate and collect the leaching solution; add hydrochloric acid reagent to the obtained leaching solution, stop adding when the pH value drops to 10, and the reaction turns orange. The precipitate was then filtered to obtain an orange precipitate, which was washed with pure water and dried to obtain 75.15 g of TDEC product. Its recovery rate is 82.70%, and its purity is 97.92%. The production and recovery process of TDEC in this embodiment can be found in figure 1 , figure 1 It is a flow chart of reclaiming TDEC in Example 1.

Embodiment 2

[0040] Add 500mL of water and 7.5g of industrial grade sodium hydroxide to 100g of TDEC waste, stir and impregnate at 90°C for 4h, filter and separate and collect the leaching solution; add hydrochloric acid reagent to the obtained leaching solution, stop adding when the pH value drops to 10, and the reaction produces orange After the yellow precipitate was filtered, an orange precipitate was obtained, which was washed with pure water and dried to obtain 70.65 g of TDEC product. Its recovery rate is 77.81%, and its purity is 97.01%.

Embodiment 3

[0042] Add 500mL of water and 10g of industrial grade sodium hydroxide to 100g of TDEC waste, stir and impregnate at 75°C for 4h, filter and separate and collect the leaching solution; add hydrochloric acid reagent to the obtained leaching solution, stop adding when the pH value drops to 10.5, and the reaction turns orange The precipitate was then filtered to obtain an orange precipitate, which was washed with pure water and dried to obtain 73.65 g of TDEC product. Its recovery rate is 81.11%, and its purity is 97.63%.

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Abstract

The invention provides a method for recycling TDEC (tellurium diethyl dithiocarbamate). The method comprises the following steps: a) under an alkaline condition, dipping TDEC waste into water and collecting leaching solution; b) regulating the pH value of the leaching solution to 9-11 and generating the TDEC. Compared with the former chemical synthesis method, in the method provided by the invention, the TDEC is prepared and recycled by taking the TDEC waste as a raw material, so that the cost is greatly lowered; in addition, the method does not need a complex operation process and is simple and easy in the recycling and preparation process, so that the method is suitable for large-scale production, and no toxic gas is generated easily in the preparation process; meanwhile, the recycling method provided by the invention is also good in yield and purity.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for recovering TDEC. Background technique [0002] Adding an accelerator to the rubber can greatly promote the reaction between the rubber and the vulcanizing agent, increase the vulcanization speed, lower the vulcanization temperature and reduce the amount of vulcanizing agent. Tellurium diethyldithiocarbamate, referred to as TDEC, belongs to dithiocarbamate rapid vulcanization accelerator, is a super accelerator with very high activity, mainly used in seals and other industries downstream of the rubber industry, especially Applied to high-end rubber products, especially for rapid vulcanization and low-temperature vulcanization products, such as natural rubber, EPDM rubber, butyl rubber and styrene-butadiene rubber, etc. It can not only improve vulcanization efficiency, reduce energy consumption, but also Improve the foaming uniformity and mechanical strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C333/16
CPCC07C333/16
Inventor 石志林殷亮熊平朱刘
Owner 昆明先导新材料科技有限责任公司