Preparation method of thiourea dioxide

The preparation of thiourea dioxide belongs to the field of peroxide preparation technology in organic chemistry, which is characterized by adding water in the reactor in advance, and then putting the raw material thiourea in batches, and adding hydrogen peroxide solution containing stabilizer (commonly known as hydrogen peroxide) at the same time to prepare thiourea dioxide.

After the reaction, the thiourea dioxide solution is filtered and dried to obtain thiourea crystalline powder. The addition amount of stabilizer can be 0.1~5% of the weight of thiourea, and the amount of crystal accustomizer can also be 0.005%~2% of the weight of thiourea in pre-added water.

The present invention through the innovation and improvement of the existing water solvent thiourea production process conditions, thiourea is added to the reaction kettle in batches, and organic phosphonic acid and citrate are added to the hydrogen peroxide solution as stabilizers, and organic polymers are added in pre-added water as crystal habit improvers, the crystallization state of thiourea dioxide has been effectively improved, the purity of the product has been improved, and the process is simple, and it is suitable for large-scale industrial production.

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