Purification process for vulcanization accelerator 2-mercaptobenzothiazole
A technology of mercaptobenzothiazole and vulcanization accelerator, which is applied in the direction of organic chemistry to achieve the effect of shortening the process flow, good effect and ensuring safety
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Embodiment 1
[0025] (1) Pass nitrogen into the extraction kettle of 1500L to replace the air in the kettle, and then add 800Kg of toluene.
[0026] (2) Pass 400kg of crude vulcanization accelerator M melt into the extraction kettle in 20-40 minutes, and at the same time open the valve of the extraction heat preservation medium on the extraction kettle to keep the temperature of the kettle at 45-48°C. Turn on the stirring, the speed is 110-130r / min.
[0027] (3) Immediately after 1.5 hours of extraction, the mixture in the extraction tank was filtered, and the filter cake obtained after filtration was dried at 70° C. under a pressure of -0.05 MPa for 2 hours to obtain 345 Kg with a purity of 98.1%. Accelerator 2- Mercaptobenzothiazole has a melting point of 172°C. Distill the filtrate to recover toluene. During the extraction process, the volatilized toluene is condensed and refluxed, and the non-condensable gas is recycled by activated carbon adsorption.
Embodiment 2
[0029] (1) Pass nitrogen into the extraction kettle of 1500L to replace the air in the kettle, and then add 800Kg of toluene.
[0030] (2) Pass 160kg of crude vulcanization accelerator M melt into the extraction kettle in 10-15 minutes, and at the same time open the valve of the extraction heat preservation medium to keep the temperature of the kettle at 40-45°C. Turn on the stirring, the speed is about 100-120r / min.
[0031] (3) After 1.5 hours of extraction, the mixture in the extraction tank was filtered. The filter cake obtained after filtration was dried at 70°C for 2 hours under a pressure of -0.05MPa to obtain 137Kg of accelerator 2-mercaptobenzothiazole with a purity of 98.4% and a melting point of 172.5°C. Distill the filtrate to recover toluene. During the extraction process, the volatilized toluene is condensed and refluxed, and the non-condensable gas is recycled by activated carbon adsorption.
Embodiment 3
[0033] (1) Pass nitrogen into the extraction kettle of 1500L to replace the air in the kettle, and then add 800Kg of toluene.
[0034] (2) Pass 100kg of crude vulcanization accelerator M melt into the extraction kettle in 8-10 minutes, and at the same time open the valve of the extraction heat preservation medium to keep the temperature of the kettle at 35-40°C. Turn on the stirring, the speed is about 120-130r / min.
[0035] (3) After 1.5 hours of extraction, the mixture in the extraction tank was filtered. The filter cake obtained after filtration was dried at 70° C. for 2 hours under a pressure of −0.05 MPa to obtain 85 kg of accelerator 2-mercaptobenzothiazole with a purity of 98.5% and a melting point of 172.5° C. Distill the filtrate to recover toluene. During the extraction process, the volatilized toluene is condensed and refluxed, and the non-condensable gas is recycled by activated carbon adsorption.
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