A kind of method that recrystallization prepares HNS-II in nitric acid

The present invention relates to energy-containing compound preparing technical field, be specifically related to a kind of method recrystallizing in nitric acid and preparing HNS II, including: the initial liquid of preparation crystallization；HNS I is joined stirring in initial liquid and obtains mixed liquor；After mixed liquor is heated to predetermined temperature, keeps constant temperature to make HNS I all dissolve or be partly dissolved, obtain lysate；The lysate all dissolved by HNS I carries out constant temperature growing the grain after being cooled to crystallization point with set rate, continue after the growing the grain scheduled time to be cooled to room temperature with set rate, or directly partly soluble for HNS I lysate is cooled to room temperature with set rate, obtain crystallization solution；Gained crystallization solution is filtered, obtains filter cake；Gained filter cake is carried out hot wash, is dried, obtain HNS II crystal.The method uses inexpensive nitric acid to make solvent, low cost, and crystallisation by cooling process is simple, can directly obtain the higher HNS of bulk density II.