Continuous crystallization process for preparing nitroguanidine through nitric acid method

• Main Authors: XU QIPENG, ZHANG LIANG, LUO ZHILONG, ZOU GAOXING, LI MENG, LI FEI, CHEN SONG, LEI QUANHU, CHEN JI, KANG CHAO, YANG YI, WANG XIAODONG
• Format: Patent
• Language: English
• Published: 26.08.2015
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention relates to a continuous crystallization process for preparing nitroguanidine through a nitric acid method. The process is applied to continuous crystallization for preparing single-compound explosive nitroguanidine and belongs to the technical field of preparation processes of explosives and powder. According to the process disclosed by the invention, the nitroguanidine is dissolved in a nitric acid solution, the synthetic process is optimized by virtue of a micro-tube reactor, the requirement of the reaction system on the nitric acid concentration is reduced, and the product yield is improved. A continuous crystallizer and a filter are arranged behind the micro-tube reactor, the continuous crystallization and filtration process is established, the manual operation is reduced, and the production efficiency of the product is improved; and moreover, with the adoption of ultrasonic oscillating and washing, the washing frequency is reduced, and wastewater emission is reduced. The process disclosed by the invention has the advantages of simplicity, high continuity, high product yield, small wastewater emission amount and the like and is particularly suitable for continuous crystallization for preparing single-compound explosive nitroguanidine.