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Towards an industrial synthesis of diamino diphenyl methane (DADPM) using novel delaminated materials: A breakthrough step in the production of isocyanates for polyurethanes

Paper ID Volume ID Publish Year Pages File Format Full-Text
41604 45894 2011 7 PDF Available
Title
Towards an industrial synthesis of diamino diphenyl methane (DADPM) using novel delaminated materials: A breakthrough step in the production of isocyanates for polyurethanes
Abstract

Delaminated materials ITQ-2, ITQ-6 and ITQ-18 are very efficient catalysts of zeolitic nature for the synthesis of diamino diphenyl methane (DADPM), the polyamine precursor in the production of MDI for polyurethanes. The exfoliation process results in excellent accessibility of their active sites to reactant molecules as well as fast desorption of products. These catalysts present higher activity and slower rates of deactivation than their corresponding zeolites. Moreover, the topology of the delaminated structure imposes a precise control of the isomer distribution, offering an additional flexibility in the synthesis of DADPM. By optimizing the process conditions it is possible to achieve final DADPM crude under industrial production specifications with ITQ-18. This catalyst represents a real chance for replacing HCl in the industrial production of DADPM.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (74 K)Download as PowerPoint slideHighlights► ITQ-2, ITQ-6 and ITQ-18 are very efficient catalysts for the synthesis of DADPM. ► Delaminated structure topology imposes precise control of isomer distribution. ► It is possible to achieve DADPM crude under industrial specifications with ITQ-18. ► ITQ-18 is a real chance for replacing HCl in the industrial production of DADPM.

Keywords
Aniline–formaldehyde condensation; Aminal; Diamino diphenyl methane; Solid acids; Delaminated zeolites
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Towards an industrial synthesis of diamino diphenyl methane (DADPM) using novel delaminated materials: A breakthrough step in the production of isocyanates for polyurethanes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 398, Issues 1–2, 15 May 2011, Pages 143–149
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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Online Support
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