Emil R. Sharafutdinov, Sofia I. Fiterman, Nikolay A. Rudnev, Rishat R. Shiriyazdanov
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REVIEW OF PHOSGENE-FREE TECHNOLOGIES FOR HEXAMETHYLENE-1,6-DIISOCYANATE PRODUCTION
One of the highly sought products for import substitution in Russia are polyurethanes, which are mainly produced from isocyanates. Today, isocyanates are produced using toxic phosgene, and the by-products of this production are hydrogen chloride and other toxic chlorinated derivatives. For this reason, the task of developing phosgene-free isocyanate production technology has been facing researchers for more than a decade.Hexamethylene-1,6-diisocyanate (HDI) is the most commonly used aliphatic isocyanate. With excellent photo-oxidation stability, HDI is a very valuable petrochemical product with high added value.This paper reviews the currently existing phosgene-free technologies for producing HDI, as well as the latest developments in this area.
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