Isocyanate production method
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsNobuhisa Miyake, Yuji Kosugi, Yusuke Sakurai, Masaaki Shinohata
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Abstract
An isocyanate production method is characterized by having: a carbamation step in which a carbonic acid ester, an inorganic acid salt of an amino acid derivative, and a basic compound are reacted to obtain a reaction mixture containing a carbamic acid ester derived from the carbonic acid ester, a hydroxy compound derived from the carbonic acid ester, and the carbonic acid ester; and a thermal decomposition step in which the carbamic acid ester is subjected to a thermal decomposition reaction to obtain an isocyanate.
Claims18
A production method of a carbamic acid ester derived from a carbonic acid ester, comprising supplying the carbonic acid ester, an inorganic acid salt of an amino acid derivative, and a basic compound to a carbamation reactor to allow reaction to proceed, wherein the carbonic acid ester comprises 0.001 ppm by mass to 10% by mass of a metallic atom, relative to a total mass of the carbonic acid ester.
Dependencies are inferred from the claim text.