SOLVENT REFINING METHOD FOR ISOCYANATE PREPARED BY PHOSGENE METHOD AND DEVICES USED IN SAME

Disclosed are a solvent refining method for isocyanate prepared by the phosgene method and multistage absorbing towers used in same. Solvent to be refined which contains water, iron, and/or phosgene , hydrogen chloride and other materials with color is dealt by the present method and multistage abso...

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Hauptverfasser: XU, DAN, WANG, YANG, YAO, YU, CHEN, BIN, SHI, QILE, ZHANG, HONGKE, CHEN, QINGLONG, SHI, DEKAI, HUA, WEIQI, ZHAO, DONGKE
Format: Patent
Sprache:chi ; eng ; fre
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