发明名称 |
Concentrating method, treating method, concentrating system and treating system for polyisocyanate residues |
摘要 |
A concentrating method and a concentrating system for concentrating polyisocyanate residues that that can effectively concentrate polyisocyanate residues from crude polyisocyanate comprising polyisocyanate and polyisocyanate residues in a short time and can also suppress increase in viscosity to provide stable transport of the residues and prevent blockage of the transport line, and a treating method and a treating system for decomposing the concentrated components to polyamine. The polyisocyanate residues are first heated on the boil by the distiller to be concentrated to a midterm concentrating rate, and then, the polyisocyanate residues are concentrated to the final concentrating rate by evaporation using a evaporator. This can allow the polyisocyanate residues to be decomposed to polyamine to be recovered by setting a Cl content of a high boiling point distillate fraction concentrated to be not more than 2 weight % and then putting the high boiling point distillate fraction into contact with high temperature and high pressure water to be hydrolyzed by the decomposing apparatus.
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申请公布号 |
US8519190(B2) |
申请公布日期 |
2013.08.27 |
申请号 |
US20060988677 |
申请日期 |
2006.07.10 |
申请人 |
SASAKI MASAAKI;YOSHIDA TADASHI;SUZUKI SHIGETOSHI;MITSUI CHEMICALS, INC. |
发明人 |
SASAKI MASAAKI;YOSHIDA TADASHI;SUZUKI SHIGETOSHI |
分类号 |
C07C263/20;C07C265/14 |
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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