Device for preparing mono-dicyandiamide through thermal cracking

Through the combination of downlink bed reactor and ice-water cooling tank, the problems of high energy consumption and serious pollution in cyandiamide and dicyandiamide production are solved, and high-efficiency, low-pollution and high-purity product preparation are achieved.

CN223249278UActive Publication Date: 2025-08-22SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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Patent Information

Application Number
CN202422500191.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-16
Publication Date
2025-08-22
Estimated Expiration
2034-10-16

AI Technical Summary

Technical Problem

The existing cyanamine and dicyanamine production processes have problems such as high energy consumption, serious pollution and difficulty in product purification, especially when active substances are prone to produce complex reactants at high temperatures, which makes it difficult to control product quality.

Method used

The downlink bed reactor is used to perform thermal cracking of melamine, combined with a gas-solid separator and an ice-water cooling tank, and through rapid high-temperature cracking and rapid cooling, the reaction time and by-product generation are reduced, and the product purity is improved.

Benefits of technology

The efficient production of high-purity cyandiamide and dicyandiamide is achieved, which simplifies the purification process, improves production efficiency and reduces energy consumption and pollution.

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Abstract

The utility model belongs to the technical field of cyanamide production, and particularly relates to a device for preparing mono-dicyandiamide through thermal cracking. The device comprises a heater (1), a catalyst tank (2), a melamine tank (3), a downer reactor (4) and a gas-solid separator (5), a heat source inlet (1-1) and a heat source outlet (1-2) are respectively arranged on the heater (1), and a nitrogen inlet (1-3) is arranged close to the heat source outlet (1-2). A catalyst tank (2) is arranged between the nitrogen inlet (1-3) and the heat source outlet (1-2); the heater (1) is connected with the downer reactor (4), and the melamine charging bucket (3) and the like are arranged between the heater (1) and the downer reactor (4). According to the utility model, melamine is taken as a raw material and passes through the downer reactor, rapid cracking is realized at high temperature, back mixing is reduced, the product purity is improved, re-purification and purification of the product are not needed, the working procedure is shortened, and the production efficiency is improved.
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