Method for making methylene dianiline and polymethylene polyanilines using molecular organic frameworks as an aminal rearrangement catalyst
The use of MOFs and homogeneous catalysts in a two-step process addresses the inefficiencies of mineral acid-based methods, achieving controlled isomer ratios and complete conversion of methylene dianiline and polymethylene polyanilines, enhancing industrial production efficiency and reducing costs.
WO2026128798A1PCT designated stage Publication Date: 2026-06-18DOW GLOBAL TECHNOLOGIES LLC
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- DOW GLOBAL TECHNOLOGIES LLC
- Filing Date
- 2025-12-12
- Publication Date
- 2026-06-18
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Figure US2025059374_18062026_PF_FP_ABST
Abstract
Mixtures of methylene dianiline isomers and polymethylene polyanilines are made with controllable methylene dianiline isomer ratios. Aniline and formaldehyde are reacted to produce N,N'-diphenylmethylene diamine (aminal), which is then partially rearranged to a mixture of aminobenzyl aniline isomers and methylene dianiline isomers in the presence of certain MOF catalysts. Further rearrangement may be performed in the presence of a homogeneous catalyst to convert the remaining aminobenzyl aniline isomers and any residual aminal to methylene dianiline and polymethylene polyanilines.
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