title: Experimental plant for simultaneous production of (14)N and (15)N by (15)N/(14)N exchange in NO, NO(2)-HNO(3) system under pressure.
abstract: An experimental study on (14)N and (15)N simultaneous separation using the chemical exchange in NO, NO(2)-HNO(3) system under pressure is presented. The influence of the pressure and of the interstage 10 M HNO(3) flow rate on the separation of (14)N and (15)N was measured on a packed column with product and waste refluxers. At steady state and 1.8 atm (absolute), the isotopic concentration at the bottom of the separation column was 0.563 at% (15)N, and in the top of the column was 0.159 at% (15)N. The height equivalent to a theoretical plate and interstage 10 M HNO(3) flow rate values, obtained in these experimental conditions, allows the separation of (14)N highly depleted of (15)N and of (15)N at 99 at% (15)N concentration.
authors.affiliation: National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania. axente@itim-cj.ro
authors.forename: Damian
authors.initials: D
authors.lastname: Axente
authors.forename: Cristina
authors.initials: C
authors.lastname: Marcu
authors.forename: Ancuţa
authors.initials: A
authors.lastname: Muresan
authors.forename: Martin
authors.initials: M
authors.lastname: Kaucsar
authors.forename: Ioan
authors.initials: I
authors.lastname: Misan
authors.forename: Gabriel
authors.initials: G
authors.lastname: Popeneciu
authors.forename: Nicolae
authors.initials: N
authors.lastname: Gligan
authors.forename: Gabriela
authors.initials: G
authors.lastname: Cristea
mesh_terms: D002849:Chromatography, Gas / Q000295:instrumentation* / Q000379:methods*; D017942:Nitric Acid / Q000737:chemistry*; D009584:Nitrogen / Q000302:isolation & purification*; D009587:Nitrogen Isotopes / Q000302:isolation & purification*; D009589:Nitrogen Oxides / Q000737:chemistry*; D011312:Pressure; D013997:Time Factors
chemical_list: D009587:Nitrogen Isotopes; D009589:Nitrogen Oxides; D017942:Nitric Acid; D009584:Nitrogen