METHOD FOR DECOMPOSITION OF TOLYLENE DIISOCYANATE-BASED POLYUREA COMPOUNDS

摘要

Provided is a method for the decomposition of tolylene diisocyanate (TDI)-based polyurea compounds, by which reusable tolylenediamine (TDA) can be recovered from a residue containing TDI-based polyurea compounds without adding a hydrolysis accelerator such as alkali thereto, said residue being a residue which is formed as a by-product in producing TDI and which has hitherto helplessly been disposed of. The method overcomes the problem of corrosion of a reactor. A method for the decomposition of TDI-based polyurea compounds, characterized by hydrolyzing TDI-based polyurea compounds in supercritical or subcritical carbon dioxide.