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METHOD FOR SEPARATING AN ISOCYANATE, WHICH WAS PRODUCED BY PHOSGENATING A PRIMARY AMINE IN THE GAS PHASE, FROM THE GASEOUS RAW PRODUCT OF THE PHOSGENATION
METHOD FOR SEPARATING AN ISOCYANATE, WHICH WAS PRODUCED BY PHOSGENATING A PRIMARY AMINE IN THE GAS PHASE, FROM THE GASEOUS RAW PRODUCT OF THE PHOSGENATION
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机译:从气相的气态原料中分离出异氰酸酯的方法,该异氰酸酯是通过气相气化初级胺而制得的
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摘要
The present invention relates to a process for separating an isocyanate prepared by reaction of a primary amine with an excess of phosgene in the gas phase from the gaseous crude product obtained in the reaction, wherein (i) the gaseous crude product is partially liquefied by contacting with a quenching liquid, (ii) the gas phase obtained in step (i) is partially condensed, (iii) the condensate obtained in step (ii) is used as the quenching liquid in step (i), (iv) the portions of the gas phase that were not condensed in step (ii) are at least partially liquefied, (v) the liquid phase obtained in step (iv) is likewise used as the quenching liquid in step (i), and (vi) the liquid phase obtained in step (i) is worked up to the pure isocyanate without previously being used as quenching liquid.
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