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    • 38. 发明授权
    • Multistage continuous preparation of cycloaliphatic disocyanates
    • 多级连续制备脂环族异氰酸酯
    • US07557242B2
    • 2009-07-07
    • US11100603
    • 2005-04-07
    • Stephan KohlstrukManfred KreczinskiHans-Werner Michalczak
    • Stephan KohlstrukManfred KreczinskiHans-Werner Michalczak
    • C07C251/00
    • C07C263/04C07C265/14
    • Cycloaliphatic diisocyanates can be prepared continuously and phosgene-free by reacting at least one cycloaliphatic diamine with at least one carbonic acid derivative and at least one alcohol to give a cycloaliphatic diurethane; freeing the cycloaliphatic diurethane of a low boiler, a medium boiler and mixtures thereof; thermally cleaving the cycloaliphatic diurethane in a cleavage apparatus to give a cycloaliphatic diisocyanate and a cleavage residue; continuously discharging a portion of the cleavage residue from the cleavage apparatus; removing the high boiler components from the discharge to obtain a purified discharge; reurethanizing the purified discharge with alcohol to obtain a reurethanized discharge; and recycling the reurethanized discharge into the process.
    • 环脂族二异氰酸酯可以通过使至少一种脂环族二胺与至少一种碳酸衍生物和至少一种醇反应而连续制备和无光气,得到脂环族二氨基甲酸酯; 释放低锅炉,中等锅炉及其混合物的脂环族二氨基甲酸酯; 在切割装置中热裂解脂环族二氨基甲酸酯以得到脂环族二异氰酸酯和裂解残基; 从裂解装置连续排出一部分裂解残基; 从放电中除去高锅炉组分以获得净化的排放物; 用乙醇对纯化的排出物进行氨基甲酸乙酯化,得到氨基甲酸酯化的排出物; 并将再生氨化的排放物回收到该过程中。