JPS54130525A - Recovery of amine - Google Patents
Recovery of amineInfo
- Publication number
- JPS54130525A JPS54130525A JP3675078A JP3675078A JPS54130525A JP S54130525 A JPS54130525 A JP S54130525A JP 3675078 A JP3675078 A JP 3675078A JP 3675078 A JP3675078 A JP 3675078A JP S54130525 A JPS54130525 A JP S54130525A
- Authority
- JP
- Japan
- Prior art keywords
- amine
- nco
- recover
- hydrolysis
- phosgenation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To recover an organic amine by a simple process and in high yield, using a reactor having relatively low pressure resistance, by the hydrolysis of an organic isocyanate compound under comparatively mild conditions using a specific amount of Ca(OH)2.
CONSTITUTION: A mixture of Ca(OH)2, water, a distillation residue of an organic isocyanate, e.g. monoisocyanate of formula R-NCO (R=phenyl, tolyl, etc.), diisocyanate of formula OCN-R' -NCO (R'=1,3-phenylene, 2,4-tolylene etc.) etc., and a caustic alkali in option, is allowed to react at 140W280°C for 10 minW20 hr and hydrolyzed to recover the corresponding amine. The amount of the hydroxide used should be large enough for the absorption of the total amount of CO2 which is liberated during the hydrolysis as a carbonate. The amine may be used in the phosgenation process after extaction with a solvent suitable for phosgenation and dehydration of the extract.
EFFECT: The cost of equipment can be reduced.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3675078A JPS5848538B2 (en) | 1978-03-31 | 1978-03-31 | Amine recovery method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3675078A JPS5848538B2 (en) | 1978-03-31 | 1978-03-31 | Amine recovery method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54130525A true JPS54130525A (en) | 1979-10-09 |
JPS5848538B2 JPS5848538B2 (en) | 1983-10-28 |
Family
ID=12478399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3675078A Expired JPS5848538B2 (en) | 1978-03-31 | 1978-03-31 | Amine recovery method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5848538B2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0099537A2 (en) * | 1982-07-21 | 1984-02-01 | Bayer Ag | Single step process for producing polyamines from NCO prepolymers |
WO1998034904A1 (en) * | 1997-02-05 | 1998-08-13 | Kabushiki Kaisha Kobe Seiko Sho | Apparatus and method for decomposing and recovering isocyanate compound |
WO2000068180A1 (en) * | 1999-05-05 | 2000-11-16 | The Dow Chemical Company | A process for recovering toluene diamine from toluene diisocyanate distillation residues |
WO2004108656A1 (en) * | 2003-06-09 | 2004-12-16 | Hanwha Chemical Corporation | Method for recovering toluene diamine from high boiling tar residue discharged from toluene diisocyanate preparation process |
CN110511132A (en) * | 2019-09-20 | 2019-11-29 | 兰州理工大学 | A kind of TDI residue method for hydrolysis for using dolomite as catalyst |
CN111183131A (en) * | 2017-12-27 | 2020-05-19 | 旭化成株式会社 | Method for recovering organic amine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023080257A1 (en) | 2021-11-08 | 2023-05-11 | 旭化成株式会社 | Method for producing isocyanate compounds, method for producing carbamate compounds, method for recovering amine compounds, and isocyanate composition |
-
1978
- 1978-03-31 JP JP3675078A patent/JPS5848538B2/en not_active Expired
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0099537A2 (en) * | 1982-07-21 | 1984-02-01 | Bayer Ag | Single step process for producing polyamines from NCO prepolymers |
WO1998034904A1 (en) * | 1997-02-05 | 1998-08-13 | Kabushiki Kaisha Kobe Seiko Sho | Apparatus and method for decomposing and recovering isocyanate compound |
US6630517B2 (en) | 1997-02-05 | 2003-10-07 | Kabushiki Kaisha Kobe Seiko Sho | Process for hydrolyzing and recycling a polyurethane |
WO2000068180A1 (en) * | 1999-05-05 | 2000-11-16 | The Dow Chemical Company | A process for recovering toluene diamine from toluene diisocyanate distillation residues |
US6429336B2 (en) | 1999-05-05 | 2002-08-06 | The Dow Chemical Company | Process for recovering toluene diamine from toluene diisocyanate distillation residues |
WO2004108656A1 (en) * | 2003-06-09 | 2004-12-16 | Hanwha Chemical Corporation | Method for recovering toluene diamine from high boiling tar residue discharged from toluene diisocyanate preparation process |
CN111183131A (en) * | 2017-12-27 | 2020-05-19 | 旭化成株式会社 | Method for recovering organic amine |
CN111183131B (en) * | 2017-12-27 | 2022-06-28 | 旭化成株式会社 | Method for recovering organic amine |
US11578030B2 (en) | 2017-12-27 | 2023-02-14 | Asahi Kasei Kabushiki Kaisha | Organic amine collection method |
CN110511132A (en) * | 2019-09-20 | 2019-11-29 | 兰州理工大学 | A kind of TDI residue method for hydrolysis for using dolomite as catalyst |
Also Published As
Publication number | Publication date |
---|---|
JPS5848538B2 (en) | 1983-10-28 |
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