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公开(公告)号：US20220024863A1
公开(公告)日：2022-01-27
申请号：US17295806
申请日：2018-12-26
发明人： Weiqi HUA , Tonghe LI , Yonghua SHANG , Shuchang SUN , Jingxu WANG , Jinping HAN , Qiang LI , Wenbin LI , Jing LI , Pengfei WANG , Yuan LI
IPC分类号： C07C263/10
摘要： A method for preparing an isocyanate in a gaseous phase by feeding, in the presence or absence of an inert gas, an amine-containing gas stream and a phosgene-containing gas stream into a reaction region, allowing the amine and the phosgene to contact in gaseous forms and undergo a phosgenation reaction in the reaction region, thus preparing the target isocyanate in a gaseous form in the reaction region. The phosgene-containing stream is subjected to preheating and warming before being fed into the reaction region, and the phosgene-containing stream comprises a substance A at a mass fraction of
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