Title:
ポリイソシアネート残渣の濃縮方法、処理方法、濃縮装置および処理装置
Document Type and Number:
Japanese Patent JP5116954
Kind Code:
B2
Abstract:
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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Inventors:
Yuuki Sasaki
Yoshida Tadashi
Shigetoshi Suzuki
Yoshida Tadashi
Shigetoshi Suzuki
Application Number:
JP2005203221A
Publication Date:
January 09, 2013
Filing Date:
July 12, 2005
Export Citation:
Assignee:
Mitsui Chemicals, Inc.
International Classes:
C07C263/20
Domestic Patent References:
| JP54000906B1 |
Foreign References:
| GB1398975A | ||||
| WO2004056761A1 | ||||
| US3410888 |
Attorney, Agent or Firm:
Hiroyuki Okamoto