کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
49743 | 46764 | 2014 | 5 صفحه PDF | دانلود رایگان |

• A new route of synthesizing MDT catalyzed by zeolites replacing mineral acids
• The catalytic activity varied with the order of Hβ > HY > HZSM-5
• High MDT yield of 87.5% by Hβ under optimal reaction conditions
• N, N′-di-o-tolyl-methanediamine found to be a key reaction intermediate
Synthesis of 3,3′-dimethyl-4,4′-diaminodiphenylmethane (MDT) from o-tolylamine and formaldehyde over zeolites was investigated. Among the three tested zeolites, Hβ showed higher catalytic activity than HY and HZSM-5 for MDT synthesis. In the case of Hβ as a catalyst, the effects of feed composition, reaction time and temperature on the yield and selectivity of product MDT were further examined to optimize process conditions. In an o-tolylamine:formaldehyde = 8:1 molar ratio, the two-step reaction running at 413 K for 0.5 h and then 433 K for 0.5 h gave the MDT yield of 87.5%.
Overview of reaction sequence for MDT synthesis over Hβ zeolite.Figure optionsDownload as PowerPoint slide
Journal: Catalysis Communications - Volume 45, 5 February 2014, Pages 69–73