Method for synthesizing 1, 5-pentamethylene diisocyanate through phosgenation reaction

• Main Authors: LIANG RUIYUAN, LIU YAOZONG, LI XIAOMING, MA WENLI, WEI WENHUI, WANG XINZHI, TAO CHUNXIA, TENG ZHIJUN, CHANG YOUCAI, ZHAO GUIRONG, MA RUIJIN, YANG YUNING, YANG YINGCHAO, WU DAN
• Format: Patent
• Language: Chinese; English
• Published: 07.03.2023
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention relates to a method for synthesizing 1, 5-pentamethylene diisocyanate through phosgenation reaction, which is characterized in that reaction synthesis is carried out through a synthesis device, and the synthesis device comprises a jet reactor, a reaction tower, a reboiler and a condenser; an outlet at the bottom of the jet reactor is connected with the reaction tower, an outlet at the bottom of the reaction tower is connected with the reboiler, a gas-phase outlet at the top of the reaction tower is connected with the condenser, a liquid-phase outlet of the condenser is connected with a reflux liquid-phase inlet at the upper part of the reaction tower, and a gas-phase outlet of the condenser is connected with the treatment system. The method provided by the invention improves the utilization rate of phosgene, shortens the reaction time, prevents solid by-products from being generated to block the ejector, prolongs the operation cycle of the device, and can realize continuous, efficient and stable