Synthesis of 15N-enriched urea (CO(15NH2)2) from 15NH3, CO, and S in a discontinuous process

Brazilian Journal of Chemical Engineering

C. R. Sant Ana Filho¹  A. L. R. M. Rossete¹  C. R. O. Tavares¹  C. V. Prestes¹  J. A. Bendassolli¹ 

[1] ,University of São Paulo Center for Nuclear Energy Piracicaba SP ,Brazil

关键词: Reactor;    Stable isotope;    15N;    Enriched compounds;   

DOI  :  10.1590/S0104-66322012000400011

来源: SciELO

【 摘 要 】

CO(15NH2)2 enriched with the stable isotope 15N was synthesized based on a reaction involving CO, 15NH3, and S in the presence of CH3OH. The method differs from the industrial method; a stainless steel reactor internally lined with polytetrafluoroethylene (PTFE) was used in a discontinuous process under low pressure and temperature. The yield of the synthesis was evaluated as a function of the parameters: the amount of reagents, reaction time, addition of H2S, liquid solution and reaction temperature. The results showed that under optimum conditions (1.36, 4.01, and 4.48 g of 15NH3, CO, and S, respectively, 40 ml CH3OH, 40 mg H2S, 100 ºC and 120 min of reaction) 1.82 g (yield 76.5%) of the compound was obtained per batch. The synthesized CO(15NH2)2 contained 46.2% N, 0.55% biuret, melting point of 132.55 ºC and did not exhibit isotopic fractionation. The production cost of CO(15NH2)2 with 90.0 at. % 15N was US$ 238.60 per gram.

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