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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Sprache: | chi ; eng ; fre |
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