申请人:Akzona Incorporated
公开号:US04203916A1
公开(公告)日:1980-05-20
A process is disclosed for selectively making trans-cyclohexane-1,4-diisocyanate, trans-cyclohexane-1,4-diamine, a trans-cyclohexane-1,4-diurethane, a trans-cyclohexane-1,4-diurea and trans-cyclohexane-1,4-disulphonyl urea by reacting ammonia with a mixture of cis and trans-cyclohexane-1,4-dicarboxylic acid, a lower alkyl ester, a glycol ester, an oligomeric ester or a polyester to make a solid trans-dicarboxylic acid diamide in a first step. The diamide is chlorinated to form cyclohexane-1,4-dicarboxylic acid-bis-N-chloramide. The latter compound is then converted into a (a) trans-cyclohexane-1,4-diamine with an alkali metal hydroxide or alkaline earth metal hydroxide; or into a (b) a trans-cyclohexane-1,4-diurethane by reaction with an alcohol or glycol in a reaction mixture containing an alkali metal hydroxide or alkaline earth metal hydroxide; or into (c) a trans-cyclohexane-1,4-diurea by reaction with a primary or secondary amine in a reaction mixture containing an alkali metal hydroxide or alkaline earth metal hydroxide; or into a (d) trans-cyclohexane-1,4-sulphonyl urea by reaction with a primary sulphonamide in a reaction mixture containing an alkali metal hydroxide and dimethyl formamide and water. The diurea prepared in (c) may be converted into trans-cyclohexane-1,4-diisocyanate with gaseous hydrogen chloride in an inert solvent. The diurethane prepared in (b) and the disulphonyl urea prepared in (d) may be thermally decomposed into trans-cyclohexane-1,4-diisocyanate.
本发明公开了一种选择性制备反式环己烷-1,4-二异氰酸酯、反式环己烷-1,4-二胺、反式环己烷-1,4-二脲、反式环己烷-1,4-二磺酰基脲的方法,其通过将氨与顺式和反式环己烷-1,4-二羧酸、较低烷基酯、甘醇酯、寡聚酯或聚酯混合物反应,制备出固体的反式二羧酸二酰胺。然后将二酰胺氯化形成环己烷-1,4-二羧酸双N-氯化酰胺。再将后者化合成(a)反式环己烷-1,4-二胺,使用碱金属氢氧化物或碱土金属氢氧化物;或使用含有碱金属氢氧化物或碱土金属氢氧化物的反应混合物,通过与醇或甘醇反应制备(b)反式环己烷-1,4-二脲;或通过与一级或二级胺反应制备(c)反式环己烷-1,4-二脲;或通过在含有碱金属氢氧化物和二甲基甲酰胺和水的反应混合物中与一级磺酰胺反应制备(d)反式环己烷-1,4-磺酰基脲。在(c)中制备的二脲可以通过在惰性溶剂中使用气态氢氯酸转化为反式环己烷-1,4-二异氰酸酯。在(b)中制备的二脲和在(d)中制备的二磺酰基脲可以热分解成反式环己烷-1,4-二异氰酸酯。