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    • 1. 发明授权
    • Process for distillation of crude isocyanate concentrates
    • 粗异氰酸酯浓缩物的蒸馏方法
    • US5043470A
    • 1991-08-27
    • US532189
    • 1990-06-01
    • Stephen A. DiBiaseLarry W. ArndtGregory M. StansfieldLouis A. Renbaun
    • Stephen A. DiBiaseLarry W. ArndtGregory M. StansfieldLouis A. Renbaun
    • C07C263/20
    • C07C263/20
    • A process is described for the separation and recovery of isocyanate monomers from isocyanate concentrates which leaves a residue which is liquid and burnable. The process for the separation and recovery of isocyanate monomers from isocyanate concentrates formed in the production of isocyanates and comprising a volatile isocyanate monomer and by-products comprises the steps of:(A) preparing a mixture comprising(A-1) the isocyanate concentrate; and(A-2) an oil solution comprising;(A-2-a) a major amount of hydrocarbon oil, and(A-2-b) a minor amount of at least one carboxylic ester obtained by reacting(A-2-b-1) at least one substituted succinic acylating agent with(A-2-b-2) at least one alcohol of the general formulaR.sub.3 (OH).sub.M (I) wherein R.sub.3 is a monovalent or polyvalent organic group joined to the OH groups through carbon bonds, and m is an integer of from 1 to about 10; and(B) heating the mixture to an elevated temperature whereby isocyanate monomer is distilled and recovered leaving a liquid residue.The presence of the oil solution in the mixture facilitates the distillation of the isocyanate concentrate, generally improves the yield of distilled isocyanate monomer, results in a residue which is liquid and easily removed from the distillation apparatus, and the liquid residue can be burned without difficulty.
    • 描述了从异氰酸酯浓缩物分离和回收异氰酸酯单体的方法,其留下液体和可燃的残余物。 在异氰酸酯制备异氰酸酯浓缩物中分离和回收异氰酸酯单体并包含挥发性异氰酸酯单体和副产物的方法包括以下步骤:(A)制备包含(A-1)异氰酸酯浓缩物的混合物; 和(A-2)油溶液,其包含: (A-2-b-1)至少一种取代的琥珀酸酰化剂(A-2-b-1)和(A-2-b) 与(A-2-b-2)至少一种通式R3(OH)M(I)的醇,其中R3是通过碳键连接到OH基上的一价或多价有机基团,m是 从1到约10; 和(B)将混合物加热到升高的温度,由此蒸馏并回收异氰酸酯单体,留下液体残余物。 混合物中的油溶液的存在有利于异氰酸酯浓缩物的蒸馏,通常提高蒸馏的异氰酸酯单体的产率,导致液体并容易从蒸馏装置中除去的残余物,并且液体残余物可以没有困难地被燃烧 。