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Determination of isomer ratio of TDI using NMR technique

S.Nandagopal, Mehilal, S.N.Jawalkar, B.Bhattacharya

Commercially available toluene diisocyanate (TDI) contains 2, 4-and 2, 6- isomer of TDI. Successful attempts have beenmade to determine the 2, 4- and 2, 6- isomer ratio of TDI using proton NMR technique at 300 MHz. The percentage of 2, 4-and 2, 6-isomer of TDI has been calculated based on the methyl protons as well as aromatic protons. The analysis data indicate that the value of 2, 4- &2, 6 isomers are in ratio of 80:20 having ±0.5 % tolerance. Further, the developed technique does not require any reference sample as other methods.