A kind of production method of high-purity thiourea
A production method, pure thiourea technology, applied in the field of preparation of high-purity thiourea, to achieve the effect of improving purity
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Embodiment 1
[0024] at 2m 3 Add 1000Kg of pure water into the reaction kettle and heat to 70°C, add 500Kg of industrial thiourea under stirring, and dissolve to obtain a thiourea solution. The measured specific gravity is 1.06g / ml. Stir and react at 70°C for 2 hours, raise the temperature to 90°C and keep stirring for 2 hours, cool down to 60°C, filter the feed liquid with a polypropylene material filter element with a pore size of 0.22 μm, dilute the filtrate with 720Kg of water, and the specific gravity is 1.025g / ml. to room temperature, pass through 732-type cation exchange resin and 717-type anion-exchange resin in turn at a flow rate of 2BV / h, the solution is filtered again, and the filtrate is put into a concentration kettle and concentrated in vacuum to 1 / 2 volume, stirred and cooled to crystallize, and after crystallization is completed, separate crystals and mother liquor, the resulting crystals are rinsed with pure water, centrifuged to dry, and dried at 80°C to obtain high-purit...
Embodiment 2
[0026] at 2m 3 Add 1000Kg of pure water to the reaction kettle and heat it to 60°C. Add 430Kg of industrial thiourea under stirring to obtain a thiourea solution. The measured specific gravity is 1.05 g / ml. Adjust the pH value of the solution to 9 with ammonia water. Activated carbon, stir and react at 70°C for 2 hours, heat up to 90°C and keep stirring for 2 hours, cool down to 60°C, filter the feed liquid with a polypropylene material filter element with a pore size of 0.22 μm, dilute the filtrate with 600Kg of water, and the specific gravity is 1.026g / ml, lowered to room temperature, passed through 732-type cation exchange resin and 717-type anion-exchange resin in turn at a flow rate of 3BV / h, the solution was filtered again, the filtrate was put into a concentration kettle and concentrated in vacuum to 1 / 2 volume, stirred and cooled to crystallize, and the crystallization was completed Afterwards, the crystals and the mother liquor are separated, and the obtained crystal...
Embodiment 3
[0028] at 2m 3 Add 1000Kg of pure water into the reaction kettle and heat it to 70°C. Add 450Kg of industrial thiourea under stirring to obtain a thiourea solution. The measured specific gravity is 1.05g / ml. Use ammonia water to adjust the pH of the solution to 8. Stir and react at 70°C for 2 hours, raise the temperature to 90°C and keep stirring for 2 hours, dilute the filtrate with 700Kg of water, the specific gravity is 1.025g / ml, cool down to room temperature, and pass through D101 macroporous adsorption resin and 732 cationic resin at a flow rate of 2BV / h Exchange resin and 717-type anion exchange resin, the solution is filtered through a polypropylene material filter element with a pore size of 0.22 μm, the filtrate is put into a concentration kettle and concentrated in vacuum to 1 / 2 volume, stirred and cooled to crystallize, after the crystallization is completed, separate the crystal and mother liquor, The resulting crystals were rinsed with pure water, centrifuged to ...
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Abstract
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