METHOD OF PRODUCING AMMONIA FROM NITROGEN AND WATER Russian patent published in 2025 - IPC C25B1/27 C01C1/02 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. Disclosed is a method of producing ammonia using 10–20% aqueous solution of phosphotungstenovanadium heteropoly acid (HPA)

H₅PW₁₀V₂O₄₀. HPA solution is poured into vessel 1, in which compartment 2 is located, separated by partition 3. Using flexible bent tube 5 levels of liquid in vessel 1 and in compartment 2 are leveled. Graphite electrode 6 is lowered into vessel 1, graphite electrode 7 is lowered into compartment 2. Both electrodes are connected to DC power supply 8. Electrode 6 is cathode, and electrode 7 is anode. Vessel 1 is connected by means of second bent tube 9 to another vessel 10. Liquid transfer pump 11 is inserted into the cut of tube 9. Gas outlet tube 12 is lowered into vessel 10 and connected to source of gaseous nitrogen. End of tube 12 is brought under bent graphite perforated electrode 13 with holes with diameter of 1–10 mm. Electrode 13 is connected to positive terminal of second DC power supply 14, and graphite electrode 15 located in vessel 10 is connected to negative terminal of DC power supply 14. Between the wall of vessel 10 and graphite electrode 15 one more tube 16 is lowered, into the cut of which the second liquid pump 17 is installed. Other end of tube 16 is lowered into vessel 1. DC power supply 8 is used to set voltage between cathode 6 and anode 7, as a result of which the HPC located in vessel 1 on the cathode changes into the restored form. Through tube 9 with the help of liquid pump 11 solution of reduced form of HPA is pumped into vessel 10. Gaseous nitrogen supplied through tube 12 to vessel 10 contacts with HPA of reduced form and falls on bent graphite perforated electrode 13, where process of oxidation of reduced form of HPA takes place back to oxidized form. Gaseous ammonia is removed by means of gas outlet tube 18. On graphite electrode 15, the oxidised HPA is partially reduced to the reduced form. Solution containing a mixture of HPA in an oxidised and a reduced form is formed in vessel 10. Through tube 16 aqueous solution containing mixture of HPA of oxidised and reduced form, by means of pump 17 enters vessel 1. HPA molecules of the oxidised form are reduced on graphite electrode 6 to the reduced form. HPA of the restored form is again launched into the process.

EFFECT: invention enables to obtain ammonia from gaseous nitrogen and water.

1 cl, 1 dwg, 3 ex