The invention discloses an amino complex compound and a preparation method and application thereof. The components of the amino complex compound are MX (NH3)n, wherein, M is one or a plurality of Li, Mg, Al, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Ba, Sn; X is one or a plurality of F, Cl, Br, NO3, SO4; m is determined according to chemical valence, which is less than or equal to 5 and more than or equal to 1; n is determined according to
coordination number, which is less than or equal to 15 and more than or equal to 1. The amino complex compound is used as an absorbent of amino after
deamination and realizes separation, purification, storage and transporting of
ammonia gas through low-temperature
ammonia absorption and high-temperature
ammonia discharge. The ammonia in circulating gas used in a synthetic ammonia technique of the invention has fast separation speed and the ammonia content entering into a
tower can be reduced below 0.1 percent, thus remarkably promoting the ammonia net value and improving the
transformation efficiency of the synthetic ammonia technique; furthermore, the invention can be suitable for different ammonia synthesis systems, in particular to a low-pressure ammonia
synthesis system and realize the solidification of the
ammonia gas during storage and transporting processes; the
ammonia storage quantity can reach 40 to 70wt percent with safety and high efficiency.