気相でイソシアネートを調製する方法

Japanese Patent JP7285924

B2

Disclosed is a method for preparing an isocyanate in a gaseous phase, comprising 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 < 1% before being subjected to the preheating and warming up, the substance A being a NCO group-containing substance and/or an olefinic double bond-containing substance. The method of the present invention can reduce the formation of clogging matter in a heat exchanger and a vessel during the preheating and warming of the phosgene and during the reaction process. Accordingly, clogging can be effectively ameliorated, a longer run cycle can be achieved, the frequency of overhaul of the phosgene-containing system can be reduced, and the safety in apparatus operation can be enhanced.

JP5226940	Gas phase phosgenation method
JP6856756	Method for producing aliphatic isocyanate
JP4739798	Polyisocyanate continuous production equipment

華 衛▲キ▼
Lee Dowa
Eika
Grandson Shujo
King Kyo Asahi
Han Kinpira
Li Qiang
Lee Moonbin
Li Jing
Wang Peng Fei
Reigen

JP2021520423A

June 02, 2023

December 26, 2018

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WANHUA CHEMICAL GROUP CO., LTD.
WANHUA CHEMICAL(NINGBO) CO.,LTD.

C07C263/10; C07C265/14

JP2009503022A
JP2008500296A
JP2012532160A
JP2010516640A

WO2010016540A1

Maeda Suzuki International Patent Attorneys Corporation

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