A PROCESS FOR DISTILLATION OF CRUDE ISOCYANATE CONCENTRATES
摘要
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 ashless dispersant; and (B) heating the mixture to an elevated temperature at reduced pressure 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 generally be burned without difficulty.
申请公布号
WO9009990(A1)
申请公布日期
1990.09.07
申请号
WO1990US00815
申请日期
1990.02.21
申请人
THE LUBRIZOL CORPORATION;MOBAY CORPORATION
发明人
DIBIASE, STEPHEN, A.;ARNDT, LARRY, W.;STANSFIELD, GREGORY, M.;RENBAUM, LOUIS, A.