发明名称 |
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 |
US5786506(A) |
申请公布日期 |
1998.07.28 |
申请号 |
US19920986878 |
申请日期 |
1992.12.04 |
申请人 |
THE LUBRIZOL CORPORATION;MILES INC. |
发明人 |
DIBIASE, STEPHEN A.;ARNDT, LARRY W.;STANSFIELD, GREGORY M.;RENBAUM, LOUIS A. |
分类号 |
C07C263/20;(IPC1-7):C07C251/00 |
主分类号 |
C07C263/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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