Method for preparing high-purity and high-stability isocyanate with high yield

• Main Authors: LI JIANFENG, WANG PENGFEI, SHANG YONGHUA, SHI BIN, LI YUAN, LIU WEIJIE, WU QIAN, CAO NA, LI QIANG, BA LONGHAN
• Format: Patent
• Language: Chinese; English
• Published: 25.02.2022
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention relates to a method for preparing high-purity and high-stability isocyanate with high yield. According to the method, an iron compound additive and an organic sulfate salt or an organic sulfate additive are added in the process of preparing isocyanate through phosgenation of amine or amine salt, so that side reactions are effectively inhibited, and the isocyanate composition which is controllable in hydrolytic chlorine index and stable in storage is obtained through separation on the basis, and therefore, the high-purity and high-stability isocyanate composition is obtained. 本发明涉及一种高收率制备高纯度高稳定性异氰酸酯的方法。该方法在胺或胺盐光气化制备异氰酸酯过程中添铁化合物添加剂以及有机硫酸酯盐或有机硫酸盐添加剂，有效抑制副反应发生，在此基础上分离得到水解氯指标可控，且储存稳定的异氰酸酯组合物，从而获得高纯度高稳定性的异氰酸酯组合物。