DE2207379C3 - - Google Patents
Info
- Publication number
- DE2207379C3 DE2207379C3 DE2207379A DE2207379A DE2207379C3 DE 2207379 C3 DE2207379 C3 DE 2207379C3 DE 2207379 A DE2207379 A DE 2207379A DE 2207379 A DE2207379 A DE 2207379A DE 2207379 C3 DE2207379 C3 DE 2207379C3
- Authority
- DE
- Germany
- Prior art keywords
- recovery
- polyethers
- approx
- polyether
- urethane
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/14—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with steam or water
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/08—Polyurethanes from polyethers
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Description
Die Erfindung bezieht sich auf ein Verfahren zur Rückgewinnung von Polyäthern aus Polyätherurethan-Kunststoffen. The invention relates to a method for recovering polyethers from polyether urethane plastics.
Polyurethane fallen bei der Herstellung von Schaumkörpern und anderen Formkörpern in verhältnismäßig großen Mengen an. Die Wiederverwendung dieser Abfallstoffe stößt auf Schwierigkeiten. Zur Rückgewinnung der Ausgangsstoffe ist es bereits bekanntgeworden, die Polyurethane einer Erhitzung unter Druck zu unterwerfen. Eine derartige Methode konnte sich in der Praxis jedoch nicht durchsetzen, weil die dabei erhaltenen Spaltprodukte eine umständliche Rückgewinnung notwendig machen, da sowohl die Urethanbindung als auch die Esterbindung dabei verseift werden.Polyurethanes are relatively common in the production of foam bodies and other molded bodies large amounts of. There are difficulties in reusing this waste material. For recovery of the starting materials, it has already become known to heat the polyurethanes under pressure subject. However, such a method could not prevail in practice because it was resulting cleavage products make a cumbersome recovery necessary, since both the urethane bond as well as the ester bond are saponified in the process.
Die anfallenden Glykole und Säuren müssen einer sorgfältigen Vakuumdestillation unterworfen werden, um brauchbare Produkte daraus zu gewinnen. Der Aufwand ist jedoch in der Regel größer als die erhaltenen Produkte dem Wert nach entsprechen.The resulting glycols and acids must be subjected to careful vacuum distillation, in order to obtain useful products from it. However, the effort is usually greater than that products received in terms of value.
Insbesondere bei Schaumstoffen werden in der jüngeren Zeit in großer Zahl Polyätherurethane verwendet Ein thermischer Aufschluß ist bei diesen Erzeugnissen bisher nicht durchgeführt worden, wohl weil die Erfahrungen aus den bisherigen Rückgewinnungsvorgängen ungünstig waren.Polyether urethanes have recently been used in large numbers in the case of foams in particular used A thermal digestion has so far not been carried out on these products because the experiences from the previous recovery processes were unfavorable.
Aus der deutschen Patentschrift 8 61 926 ist ein Verfahren zum Behandeln von Polyurethanabfällen bekannt, bei dem ein Aufschluß mit viel Wasser bei einer Temperatur von über 2500C und bei hohem Druck über mehrere Stunden erfolgt Hierbei tritt wie vorgesehen eine totale Zerlegung der Polyurethanausgangsmasse in Diole und Diamine ein. Dieser Aufschluß führt nur zu Monomeren und läßt sich für eine Rückgewinnung von Polyäthern aus entsprechenden Polyätherurethan nicht anwenden. Ein solches Polymerer wurde, wenn es in dem Ausgangsmaterial enthalten wäre, über die genannten Bedingungen ebenfalls in Monomers aufge-A process for treating polyurethane waste is known from German patent specification 8 61 926, in which digestion takes place with a lot of water at a temperature of over 250 ° C. and at high pressure for several hours and diamines. This digestion only leads to monomers and cannot be used for the recovery of polyethers from the corresponding polyether urethane. Such a polymer, if it were contained in the starting material, would also be dissolved in monomers under the conditions mentioned.
s spalten.s columns.
Auch nach der deutschen Patentschrift 9 67 601 tritt durch die alkalische Verseifung bei hoher Temperatur und bei hohem Druck in wäßriger Phase ein vollständiger Abbau zu Dioden und Diaminen ein. Auch auf diesem Wege konnten die Polyäther aus entsprechenden Polyätherurethan ebenfalls nicht zurückgewonnen werden, weil die Arbeitsbedingungen für die Rückgewinnung zu hart sind. Darüber hinaus führt ein alkalischer Aufschluß zu erheblichen Nachteilen bei der späteren Isolierung von Polyäthern.Also according to the German patent 9 67 601 occurs through the alkaline saponification at high temperature and complete degradation to diodes and diamines occurs at high pressure in the aqueous phase. Even In this way, the polyethers could not be recovered from the corresponding polyether urethane either because the working conditions are too harsh for recovery. It also introduces alkaline digestion leads to considerable disadvantages in the subsequent isolation of polyethers.
Die Erfindung besteht in einem Verfahren zur Rückgewinnung von Polyethern aus Kunststoffen auf
Basis Polyätherurethan durch längeres Erhitzen auf 150 bis 220° C in einem geschlossenem Behälter in Gegenwart
von Wasser bei einem Druck von ca. 20 atü. das dadurch gekennzeichnet ist, daß der Aufschluß bei einer
Dauer von ca. 100 Minuten in Wasserdampf erfolgt, die
Spaltprodukte in Toluol oder einem anderen organischen Lösungsmittel aufgenommen, mit 5%iger SaIzsäure
behandelt werden und nach dem Dekantieren der wäßrigen Phase das Lösungsmittel abgedampft wird.
In dem angegebenen Temperaturinterval wird zwarThe invention consists in a process for the recovery of polyethers from plastics based on polyether urethane by prolonged heating to 150 to 220 ° C in a closed container in the presence of water at a pressure of about 20 atmospheres. which is characterized in that the digestion takes place in steam for about 100 minutes, the cleavage products are taken up in toluene or another organic solvent, treated with 5% hydrochloric acid and, after decanting the aqueous phase, the solvent is evaporated.
In the specified temperature interval
■ ebenfalls die Urethangruppe gespalten, jedoch bleibt die Äthergruppe der Polyätherurethane weitgehend unverändert erhalten. Es ist nur eine geringfügige Erhöhung der Hydroxylzahl festzustellen. Der auf diese Weise erhaltene Polyäther kann in kontinuierlicher Arbeitsweise aufgearbeitet und wieder verwendet werden. Auch die erhaltenen Amine können als Ausgangsstoffe für die Diisocyanate auf bekannte Weise wieder verwendet werden.■ also split the urethane group, but the ether group of the polyether urethanes remains largely unchanged obtain. There is only a slight increase in the hydroxyl number. That way Polyether obtained can be worked up and reused in a continuous procedure. The amines obtained can also be used as starting materials for the diisocyanates in a known manner be used.
In einen Autoklav von 501 Inhalt werden 5 kg Polyätherurethan gegeben. Unter direktem Dampfdruck von 20 atü wird das Polyätherurethan auf 180° für ca. 100 Minuten erwärmt Nachdem die so behandelte Masse aus dem Autoklaven entnommen ist, wird sie in organische Lösungsmittel, wie z. B. Toluol gelöst, mit 5°/oiger Salzsäure versetzt, so daß die aus der Urethangruppenspaltung enstandenen Amine durch Dekantieren entfernt werden können. Die organische Lösung wird eingedampft, filtriert und als Rückstand ein Polyäther erhalten, der ein Molgewicht von ca. 3000 und so eine Hydroxylzahl von ca. 40 aufweistAn autoclave with a capacity of 501 contains 5 kg Given polyether urethane. Under direct vapor pressure of 20 atmospheres, the polyether urethane is heated to 180 ° for heated for approx. 100 minutes After the mass treated in this way has been removed from the autoclave, it is in organic solvents, such as. B. toluene dissolved with 5% hydrochloric acid added, so that the amines formed from the cleavage of urethane groups through Decanting can be removed. The organic solution is evaporated, filtered and concentrated as a residue Polyether obtained which has a molecular weight of about 3000 and thus a hydroxyl number of about 40
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2207379A DE2207379B2 (en) | 1972-02-17 | 1972-02-17 | Process for the recovery of polyethers from polyether urethane plastics |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2207379A DE2207379B2 (en) | 1972-02-17 | 1972-02-17 | Process for the recovery of polyethers from polyether urethane plastics |
Publications (3)
Publication Number | Publication Date |
---|---|
DE2207379A1 DE2207379A1 (en) | 1973-08-30 |
DE2207379B2 DE2207379B2 (en) | 1978-06-22 |
DE2207379C3 true DE2207379C3 (en) | 1979-03-22 |
Family
ID=5836183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2207379A Granted DE2207379B2 (en) | 1972-02-17 | 1972-02-17 | Process for the recovery of polyethers from polyether urethane plastics |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2207379B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4399236A (en) | 1980-09-13 | 1983-08-16 | Bayer Aktiengesellschaft | Process for separating polyurethane hydrolyzates into polyether and diamine |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1601787A (en) * | 1977-08-22 | 1981-11-04 | Ford Motor Co | Hydrolytic decomposition method and apparatus |
DE2854940A1 (en) * | 1978-12-20 | 1980-07-10 | Bayer Ag | METHOD FOR SEPARATING POLYURETHANE FOAM HYDROLYSATES IN POLYOL AND DIAMINE |
DE4028724C2 (en) * | 1990-09-10 | 1997-04-30 | Eisenmann Kg Maschbau | Process and device for the disposal and incineration of production residues from polyurethane foams |
WO2023083968A1 (en) | 2021-11-12 | 2023-05-19 | Covestro Deutschland Ag | Method for recovering raw materials from polyurethane products |
-
1972
- 1972-02-17 DE DE2207379A patent/DE2207379B2/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4399236A (en) | 1980-09-13 | 1983-08-16 | Bayer Aktiengesellschaft | Process for separating polyurethane hydrolyzates into polyether and diamine |
Also Published As
Publication number | Publication date |
---|---|
DE2207379A1 (en) | 1973-08-30 |
DE2207379B2 (en) | 1978-06-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE1595321A1 (en) | Process for the decomposition of polyether urethanes | |
DE1618795A1 (en) | Liquid mixtures of 4,4'-methylene bis (cyclohexyl isocyanate) isomers | |
DE2207379C3 (en) | ||
DE861926C (en) | Process for the treatment of polyurethane waste | |
DE1110405B (en) | Process for the processing of polyurethane foam waste | |
DE967601C (en) | Process for the recovery of higher molecular weight cleavage products which can be crosslinked to form plastics from waste crosslinked nitrogenous polycondensation products | |
DE857960C (en) | Process for the preparation of cyclohexenyl-cyclohexanone by condensation of cyclohexanone | |
DE2249459A1 (en) | PROCESS FOR THE PRODUCTION OF ISOCYANATES | |
EP0013350B1 (en) | Process for splitting up polyurethane hydrolysis products into polyol and polyamine | |
US2680131A (en) | Trans vinylene diisocyanate and method of preparation | |
DE1570249A1 (en) | Process for the recovery of polyol and amine derivatives by the decomposition of polyurethane substances | |
DE3036423A1 (en) | DITERTIA AMINES AND METHOD FOR CURING POLYURETHANE FOAMS USING THESE AMINES AS CURING CATALYSTS | |
DE637258C (en) | Process for the production of ascorbic acid | |
DE1160427B (en) | Process for the production of nitric acid esters of polyhydric alcohols | |
DE953115C (en) | Process for the production of high molecular weight, crosslinked plastics from linear or predominantly linear polyesters, diisocyanates and glycols | |
AT237608B (en) | Process for the preparation of perchlorinated aryl isocyanates | |
AT205494B (en) | Process for the production of dimethyl terephthalate of extremely high purity | |
DE484904C (en) | Process for the preparation of ester mixtures | |
DE274856C (en) | ||
DE933783C (en) | Process for the production of high molecular weight, crosslinked plastics | |
DE1595321C3 (en) | Process for the recovery of the polyethers and polyisocyanates which are used as starting materials for the production of polyether urethanes | |
DE1618845C (en) | ||
DE1493504A1 (en) | Process for the preparation of 2-aminoalkyl-sulfuric acid esters | |
DE1962598C (en) | Process for the recovery of aromatic diisocyanates | |
DE857962C (en) | Process for the hydrogenation of isocyclic o-dioxy compounds to give the corresponding alicyclic o-diols |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
OGA | New person/name/address of the applicant | ||
C3 | Grant after two publication steps (3rd publication) | ||
8339 | Ceased/non-payment of the annual fee |