EP0000463B1 - "Procédé de séparation du toluène diisocyanate à partir des résidus de fabrication" - Google Patents
"Procédé de séparation du toluène diisocyanate à partir des résidus de fabrication" Download PDFInfo
- Publication number
- EP0000463B1 EP0000463B1 EP78400051A EP78400051A EP0000463B1 EP 0000463 B1 EP0000463 B1 EP 0000463B1 EP 78400051 A EP78400051 A EP 78400051A EP 78400051 A EP78400051 A EP 78400051A EP 0000463 B1 EP0000463 B1 EP 0000463B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tdi
- toluene diisocyanate
- residues
- fabrication process
- temperature
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C263/00—Preparation of derivatives of isocyanic acid
- C07C263/18—Separation; Purification; Stabilisation; Use of additives
- C07C263/20—Separation; Purification
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S159/00—Concentrating evaporators
- Y10S159/10—Organic
Definitions
- the present invention relates to a process for the separation of toluene diisocyanate (TDI) from manufacturing residues.
- TDI toluene diisocyanate
- the Applicant has developed an entirely continuous process for separating TDI from heavy materials, and for extracting these residues in the form of a solid, which has the advantage of being simple, easy to use and reliable. , without foaming or decomposition, the residues containing only low TDI contents.
- the separation takes place in a stirred and scraped type evaporator, such as that described in BF 2,039,628.
- the Applicant has provided a solution to this problem which consists in continuously heating the TDI / heavy products mixture on a wall to a maximum temperature of 260 ° C., to evaporating the TDI at a temperature starting from 100 to 130 ° C. under pressure. from 666.5 to 2666 Pa while stirring the mixture for a time sufficient to promote mass transfer. The mixture is then gradually brought throughout the apparatus to a temperature of approximately 220 to 260 ° C., while it passes from the viscous state to the pasty state then to the solid state.
- Agitation must be sufficient to ensure heat exchange, the progression of the products in the evaporator, the scraping of the solids and the breaking of any foam formed.
- the volume of the device must be such that it allows sufficient residence time to ensure the exchange of materials (from 15 to 45 minutes).
- the outgoing solids contain less than 3% TDI. Their temperature can be without risk of foaming brought to a temperature of 260 ° C at the end of the device to evacuate the last traces of TDI.
- Solid residues in the form of powder or compact granules are taken up by pneumatic transport and sent to an incinerator, while the TDI is condensed in a conventional manner.
- the method of the invention presents the advantages of being able to operate continuously in a fully automatic manner and guaranteeing all non-pollution conditions. In addition, it requires little thermal or mechanical energy and is therefore very economical.
- a device of 20 to 25 m2 and 1,600 liters, followed by an extruder, is sufficient to ensure the continuous separation of heavy and TDI from a unit of 30,000 tonnes / year of TDI.
- a mixture composed of 43% TDI and 57% heavy compounds from the bottom of the concentration column is introduced into the apparatus at a rate of 60 kg / h m2.
- the device has a heated surface of 0.86 m2 and a total volume of 20 liters and has 2 self-cleaning stirring screws rotating at different speeds. Under a pressure of 1600 Pa, the mixture is gradually brought to 215 ° C., and is transformed into a powder containing 2.8% of TDI after a residence time of 15 min.
- the TDI is condensed and collected, and the solid residues are extruded by pressure through a die in the form of granules of 6 mm in diameter and 15 mm in length, at a rate of 30 kg / h.
- Example 3 shows that a minimum residence time, which we have set at 15 min, is required if we want to obtain a low TDI content in the residues.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7721436 | 1977-07-12 | ||
FR7721436A FR2397396A1 (fr) | 1977-07-12 | 1977-07-12 | Procede de recuperation du toluene diisocyanate a partir des residus de fabrication |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0000463A1 EP0000463A1 (fr) | 1979-01-24 |
EP0000463B1 true EP0000463B1 (fr) | 1982-01-06 |
Family
ID=9193273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP78400051A Expired EP0000463B1 (fr) | 1977-07-12 | 1978-07-03 | "Procédé de séparation du toluène diisocyanate à partir des résidus de fabrication" |
Country Status (17)
Country | Link |
---|---|
US (1) | US4216063A (ru) |
EP (1) | EP0000463B1 (ru) |
JP (1) | JPS5419938A (ru) |
AR (1) | AR214462A1 (ru) |
AU (1) | AU522377B2 (ru) |
BR (1) | BR7804465A (ru) |
CA (1) | CA1094090A (ru) |
DD (1) | DD138314A5 (ru) |
DE (1) | DE2861504D1 (ru) |
DK (1) | DK154426C (ru) |
ES (1) | ES471637A1 (ru) |
FR (1) | FR2397396A1 (ru) |
IE (1) | IE47024B1 (ru) |
IN (1) | IN148484B (ru) |
IT (1) | IT1111627B (ru) |
PT (1) | PT68171A (ru) |
SU (1) | SU1264840A3 (ru) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2915830A1 (de) * | 1979-04-19 | 1980-10-23 | Basf Ag | Gewinnung von toluylendiisocyanat und/oder hoehersiedenden loesungsmitteln im wirbelbett aus destillationsrueckstaenden der toluylendiisocanat-herstellung |
FR2625742B1 (fr) * | 1988-01-13 | 1990-06-22 | Rhone Poulenc Chimie | Procede de separation du toluene diisocyanate contenu dans les residus de sa fabrication |
JPH02138567U (ru) * | 1989-04-21 | 1990-11-19 | ||
US5051152A (en) * | 1989-09-26 | 1991-09-24 | Air Products And Chemicals, Inc. | Preparation of urethane prepolymers having low levels of residual toluene diisocyanate |
JP2504851Y2 (ja) * | 1990-02-07 | 1996-07-24 | 株式会社シマノ | 釣り用リ―ルのリ―ドスイッチ取り付け構造 |
DE4317669A1 (de) * | 1993-05-27 | 1994-12-01 | Bayer Ag | Verfahren zur Herstellung von Isocyanaten und kontinuierlichen Aufarbeitung des Rückstandes |
DE4430951C1 (de) * | 1994-08-31 | 1996-05-23 | Bayer Ag | Verfahren und Vorrichtung zur Abtrennung eines festen Rückstandes aus seiner Lösung im gerührten Gutbett |
US5962728A (en) * | 1997-10-31 | 1999-10-05 | Arco Chemical Technology, L.P. | Isocyanate residue purification |
DE10260092A1 (de) * | 2002-12-19 | 2004-07-01 | Basf Ag | Verfahren zur Reinigung von Isocyanaten |
JP5254020B2 (ja) * | 2005-09-29 | 2013-08-07 | ビーエーエスエフ ソシエタス・ヨーロピア | イソシアネート含有残留物を精製する方法 |
CN102408354A (zh) * | 2011-10-24 | 2012-04-11 | 天津大学 | 一种回收甲苯二异氰酸酯的方法及装置 |
EP2872481B1 (de) * | 2012-07-11 | 2016-08-24 | Covestro Deutschland AG | Verfahren zur aufarbeitung von destillationsrückständen aus der isocyanatherstellung |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2706169A (en) * | 1954-03-04 | 1955-04-12 | Du Pont | Flash distillation of 2,4-tolylene diisocyanate |
US2974725A (en) * | 1954-05-04 | 1961-03-14 | Bayer Ag | Process and apparatus for continuously obtaining dry materials |
US3457291A (en) * | 1965-04-01 | 1969-07-22 | Union Carbide Corp | Production of isocyanates |
US3405040A (en) | 1965-08-31 | 1968-10-08 | Mobay Chemical Corp | Method for recovering tolylene diisocyanate |
US3542112A (en) * | 1968-06-05 | 1970-11-24 | Artisan Ind | Thin-film evaporator having multi-zone temperature control jacket |
CA998060A (en) | 1970-05-22 | 1976-10-05 | Carl F. Irwin | Recovery of organic isocyanate |
DD130143B1 (de) * | 1975-08-15 | 1979-12-27 | Guenter Muecke | Verfahren zur kontinuierlichen thermischen abtrennung organischer isocyanate aus fluessigem destillationsrueckstand |
-
1977
- 1977-07-12 FR FR7721436A patent/FR2397396A1/fr active Granted
-
1978
- 1978-06-15 PT PT68171A patent/PT68171A/pt unknown
- 1978-06-20 IN IN453/DEL/78A patent/IN148484B/en unknown
- 1978-06-23 IT IT68483/78A patent/IT1111627B/it active
- 1978-06-23 US US05/918,581 patent/US4216063A/en not_active Expired - Lifetime
- 1978-06-30 AR AR272793A patent/AR214462A1/es active
- 1978-07-03 DE DE7878400051T patent/DE2861504D1/de not_active Expired
- 1978-07-03 EP EP78400051A patent/EP0000463B1/fr not_active Expired
- 1978-07-07 IE IE1366/78A patent/IE47024B1/en not_active IP Right Cessation
- 1978-07-10 AU AU37902/78A patent/AU522377B2/en not_active Expired
- 1978-07-10 DD DD78206629A patent/DD138314A5/xx unknown
- 1978-07-11 BR BR7804465A patent/BR7804465A/pt unknown
- 1978-07-11 DK DK310578A patent/DK154426C/da not_active IP Right Cessation
- 1978-07-11 CA CA307,196A patent/CA1094090A/fr not_active Expired
- 1978-07-11 ES ES471637A patent/ES471637A1/es not_active Expired
- 1978-07-12 SU SU782634047A patent/SU1264840A3/ru active
- 1978-07-12 JP JP8412978A patent/JPS5419938A/ja active Granted
Also Published As
Publication number | Publication date |
---|---|
US4216063A (en) | 1980-08-05 |
BR7804465A (pt) | 1979-03-20 |
CA1094090A (fr) | 1981-01-20 |
PT68171A (fr) | 1978-07-01 |
AU522377B2 (en) | 1982-06-03 |
IT7868483A0 (it) | 1978-06-23 |
AR214462A1 (es) | 1979-06-15 |
SU1264840A3 (ru) | 1986-10-15 |
JPS612057B2 (ru) | 1986-01-22 |
DK154426C (da) | 1989-04-10 |
DE2861504D1 (en) | 1982-02-25 |
DK310578A (da) | 1979-01-13 |
ES471637A1 (es) | 1979-02-01 |
FR2397396A1 (fr) | 1979-02-09 |
IT1111627B (it) | 1986-01-13 |
IE47024B1 (en) | 1983-11-30 |
AU3790278A (en) | 1980-01-17 |
IN148484B (ru) | 1981-03-07 |
DK154426B (da) | 1988-11-14 |
IE781366L (en) | 1979-01-12 |
EP0000463A1 (fr) | 1979-01-24 |
FR2397396B1 (ru) | 1980-01-18 |
JPS5419938A (en) | 1979-02-15 |
DD138314A5 (de) | 1979-10-24 |
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