[EN] PHENYL ISOCYANATE CONVERSION PROCESS<br/>[FR] PROCÉDÉ DE CONVERSION D'ISOCYANATE DE PHÉNYLE
申请人:DOW GLOBAL TECHNOLOGIES LLC
公开号:WO2020163092A1
公开(公告)日:2020-08-13
Phenyl isocyanates are removed from a solvent stream obtained from an MDI and/or PMDI manufacturing process by reaction in the presence of a carbodiimidization catalyst to form the corresponding N,N-diphenylcarbodiimides. The N,N-diphenylcarbodiimides can be recycled into the MDI and/or PMDI manufacturing process where they can react with MDI and/or PMDI to form uretonimines. The uretonimines have at most minimal effect on the properties and usefulness of the MDI and/or PMDI product and so can be left in the MDI and/or PMDI product.