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    • 7. 发明授权
    • Multiple-step process for the preparation of hexamethylene
diisocyanate-1,6 and/or isomeric aliphatic diisocyanates with six
carbon atoms in the alkylene residue
    • 用于制备在亚烷基残基中具有6个碳原子的六亚甲基二异氰酸酯-1,6-和/或异构脂族二异氰酸酯的多步法
    • US4596678A
    • 1986-06-24
    • US600143
    • 1984-04-13
    • Franz MergerFriedrich TowaeHans HellbachGunther IsbarnWaldemar Koehler
    • Franz MergerFriedrich TowaeHans HellbachGunther IsbarnWaldemar Koehler
    • C07C265/14C07C67/00C07C69/00C07C241/00C07C263/04C07C263/06C07C265/04
    • C07C263/04
    • Hexamethylene diisocyanate and/or isomeric alkylene diisocyanates having 6 carbon atoms in the alkylene radical, preferably 2-methylpentamethylene 1,5-diisocyanate and/or 2-ethyltetramethylene 1,4-diisocyanate are prepared without the use of phosgene in a multiple-step process by means of(a) reacting hexamethylene 1,6-diamine and/or isomeric alkylene diamines having 6 carbon atoms in the alkylene radical with urea and alcohol in the presence of dialkyl carbonate and/or carbamic acid alkyl ester as well as, in some cases, catalysts to form hexamethylene 1,6-dialkylurethane and/or isomeric alkylene dialkylurethanes having 6 carbon atoms in the alkylene radical,(b) separation and return to reaction step (a) of alcohol, dialkyl carbonate, and/or carbamic acid alkyl ester from the reaction mixture(c) evaporation of the hexamethylene 1,6-dialkylurethane and/or isomeric alkylene dialkylurethanes having 6 carbon atoms in the alkylene radical,(d) cleavage of the vaporized diurethanes into hexamethylene diisocyanate and/or isomeric alkylene diisocyanate having 6 carbon atoms in the alkylene radical and alcohol, and(e) fractional condensation of the cleavage products.
    • 在多步法中不使用光气制备在亚烷基中具有6个碳原子的六亚甲基二异氰酸酯和/或异构亚烷基二异氰酸酯,优选2-甲基五亚甲基-1,5-二异氰酸酯和/或2-乙基四亚甲基1,4-二异氰酸酯 通过(a)在碳酸二烷基酯和/或氨基甲酸烷基酯的存在下,使亚烷基中的六亚甲基1,6-二胺和/或具有6个碳原子的异构亚烷基二胺与脲和醇反应,以及在一些 情况下,在亚烷基中形成具有6个碳原子的六亚甲基1,6-二烷基氨基甲酸酯和/或异构亚烷基二烷基氨基甲酸酯的催化剂,(b)分离并返回到醇,碳酸二烷基酯和/或氨基甲酸烷基酯的反应步骤(a) (c)在亚烷基中蒸发具有6个碳原子的六亚甲基1,6-二烷基氨基甲酸酯和/或异构亚烷基二烷基氨基甲酸酯,(d)将汽化的二氨基甲酸酯裂解成h 亚烷基二异氰酸酯和/或亚烷基和醇中具有6个碳原子的异构亚烷基二异氰酸酯,和(e)裂解产物的分级缩合。