An Improved Process for Industrial Production of Isosorbide-5-mononitrate: Recycling of Wastes
journal contributionposted on 24.07.2018 by Shi-Guo Zhu, Jiang-Tao Yang, Gui-Min Zhang, Cheng-Fu Chen, Fu-Li Zhang
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Different schemes were studied for the recovery of wastes generated during the industrial production of isosorbide-5-mononitrate (IS-5-MN). For the wastewater, disposal was achieved by hydrolysis of isosorbide-2-mononitrate (IS-2-MN) to the starting material isosorbide (IS) utilizing its alkaline environment, where NaOAc was also recovered effectively in the form of the trihydrate. For the solid waste, two different schemes were investigated: direct crystallization and catalytic hydrogenation. The former afforded useful isosorbide dinitrate (ISDN) efficiently, and the latter provided an efficient and scalable route to synthesize IS-5-MN from ISDN. The combinations of unit operations were evaluated on a 100 kg scale and proved to be feasible and robust. The waste recycling strategy provides an eco-friendly complement for the industrial-scale preparation of IS-5-MN, which minimizes waste emission during the process.