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    Multiprocess manufacture of fatty diisocyanate of isomer having six carbon atomes in alkylene group and/or hexamethylene-diisocyanate-1,6
    49.
    发明专利
    Multiprocess manufacture of fatty diisocyanate of isomer having six carbon atomes in alkylene group and/or hexamethylene-diisocyanate-1,6 失效
    在亚烷基和/或十六烷基二异氰酸酯-1,6中的六个碳原子的异构体的脂肪二异氰酸酯的多功能性制造

    公开(公告)号：JPS59205352A

    公开(公告)日：1984-11-20

    申请号：JP8036284

    申请日：1984-04-23

    Applicant: Basf Ag

    Inventor： FURANTSU MERUGAA ,  FURIIDORIHI TOBUE ,  HANSU HERUBATSUHA ,  GUNTAA ISUBARUN ,  BUARUDEMARU KEERAA

    IPC: C07C265/14 ,  C07C67/00 ,  C07C69/00 ,  C07C241/00 ,  C07C263/04 ,  C07C263/06 ,  C07C265/04

    CPC classification number: C07C263/04 ,  C07C265/14

    Abstract: 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.

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