Toluene diisocyanate (TDI) is an organic compound with the formula CH3C6H3(NCO)2 and a  member of Isocyanates, which is chemically related to polyurethanes. To sensitize TDI, 2,4-TDI is prepared in three steps from toluene via dinitrotoluene and 2,4-diaminotoluene (TDA). Finally, the TDA is subjected to phosgenation, i.e., treatment with phosgene to form TDI. This final step produces HCl as a byproduct and is a major source of industrial hydrochloric acid. TDA, in turn, reacts with carbonyl dichloride (CDC) to produce toluene diisocyanate (TDI). Toluene diisocyanate produced in Karun is an 80/20 mixture of 2,4-TDI (CAS: 584-84-9) and 2,6-TDI (CAS: 91-08-7) isomers with purity of at least 99.5%. Methylene Diphenyl Diisocyanate (MDI), most often abbreviated as MDI, is an aromatic diisocyanate. Three isomers are common, varying by the positions of the isocyanate groups around the rings: 2,2'-MDI, 2,4'-MDI, and 4,4'-MDI. The 4,4' isomer is most widely used, and is also known as 4,4'-diphenylmethane diisocyanate. This isomer is also known as Pure MDI. MDI reacts with polyols in the manufacture of polyurethane.

TDI & MDI

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