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发明授权
CN104974010B 一种光气法制异氰酸酯的溶剂精制方法及所使用的装置 有权

一种光气法制异氰酸酯的溶剂精制方法及所使用的装置
摘要：
本发明公开了一种光气法制备异氰酸酯的溶剂的精制方法以及该方法所采用多级吸收塔。通过本发明的方法和多级吸收塔处理含有水分、铁分、和/或光气、氯化氢、以及其它带色物质的待精制溶剂，能有效防止干燥剂吸水板结，塔内局部过热以及沟流的产生，同时有效降低压降；此外，精制后的溶剂中水分≤50ppm，铁分含量≤5ppm，光气和氯化氢含量≤20ppm，铂‑钴色号≤20，可作为光气法制备异氰酸酯的溶剂使用，能够明显提高异氰酸酯的L色。采用本发明的方法，通过对溶剂的精制和循环利用，能大大减少溶剂损耗，降低生产成本，工艺可操作性强，连续性与稳定性好。
摘要（英）：

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 absorbing towers, which can effectively prevent a drying agent from absorbing water and hardening, partial overheating in the tower and generating channeling. Meanwhile, the pressure drop is effectively lowered. In addition, the content of water is ≦50 ppm, the content of iron is ≦5 ppm, the content of phosgene and hydrogen chloride is ≦20 ppm, Pt—Co chroma is ≦20 in the refined solvent. Therefore, the refined solvent can be used as the solvent for preparing isocyanate in the phosgene method and remarkably improve an L color of isocyanate.

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