DE2908495A1 - Vinyl chloride monomer removal from PVC - by circulating light-activated chlorine gas diluted with nitrogen - Google Patents
Vinyl chloride monomer removal from PVC - by circulating light-activated chlorine gas diluted with nitrogenInfo
- Publication number
- DE2908495A1 DE2908495A1 DE19792908495 DE2908495A DE2908495A1 DE 2908495 A1 DE2908495 A1 DE 2908495A1 DE 19792908495 DE19792908495 DE 19792908495 DE 2908495 A DE2908495 A DE 2908495A DE 2908495 A1 DE2908495 A1 DE 2908495A1
- Authority
- DE
- Germany
- Prior art keywords
- pvc
- vinyl chloride
- chlorine gas
- nitrogen
- gas diluted
- 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.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/006—Removal of residual monomers by chemical reaction, e.g. scavenging
Abstract
Description
Verfahren und Einrichtung zur Eceiting von Vinylchlorid-Process and device for eceiting vinyl chloride
Restgehalten in Polyv4nolchlorid Gemäß der Hauptanmeldung wird Polyvinylchlorid als Pulver oder in gelöster Form einer Chloreinwirkung unterworfen, wobei die Chlorierungsreaktion in begrenzter Weise in der Polymerkette vor sich geht. Es wird aber eine Korrektur der fehlerhaften Kettenstruktur der PVC-Polymere vorgenommen, indem man die kurzkettige Kettenabzweigungen, die qualitativ als Vinylchlorid gelten können, beseitigt.Residual content in polyvinyl chloride According to the main application, polyvinyl chloride as a powder or in dissolved form is subjected to the action of chlorine, the chlorination reaction taking place in a limited manner in the polymer chain. However, the incorrect chain structure of the PVC polymers is corrected by eliminating the short-chain chain branches, which can qualify as vinyl chloride.
Gleichzeitig findet im begrenzten Umfang die Additionschlorierung von einfach und mehrfach ungesättigten Stellen in der Kette statt, Abbau von Fremdstoffen wie Katalysatorreste, Metallverbindungen usw.At the same time, the addition chlorination takes place to a limited extent of monounsaturated and polyunsaturated points in the chain, degradation of foreign substances such as catalyst residues, metal compounds, etc.
Dies alles bewirkt, daß nach der Verformung von PVC zu Verpackungen für Lebensmittel und deren Lagerung keine Möglichkeiten mehr bestehen, Vinylchlorid oder kurzkettige, quantitativ als Vinylchlorid bei der Analyse erfaßte Vinylchloridpolymere unter Einwirkung von sich in der verpackten Ware oder aber in der Polymerkette befindlichen Katalysatoren oder unter Sonneneinwirkung abzuspalten und physiologisch oder gar toxisch auf den menschlichen Körper einzuwirken.All of this causes after the deformation of PVC to packaging There are no longer any options for food and its storage, vinyl chloride or short chain vinyl chloride polymers quantified as vinyl chloride on analysis under the influence of those in the packaged goods or in the polymer chain Catalysts or split off under the action of the sun and physiologically or even have a toxic effect on the human body.
Nun hat sich aber herausgestellt, daß bei einer großtechnischen Ausführung bestimmte praktische Voraussetzungen eingehalten werden müssen, um den nachbehandelten Produkt die höchste Qualität zu erhalten, die Produktionsapparatur keiner übermäßigen Korrosion auszusetzen und umweltfreundliche Arbeitsbedingungen zu schaffen.But it has now been found that in a large-scale implementation certain practical requirements must be met in order to receive the post-treated Product to get the highest quality, the production equipment no excessive Exposing them to corrosion and creating environmentally friendly working conditions.
Um die durch Wärme hervorgerufene schädigende Einwirkung auf PVC auf ein Mindestmaß zu beschränken, wird eine Arbeitstemperatur von 800 C nicht überschritten, wobei gemäß der vorliegenden Zusatzerfindung, das einwirXende, tro'ckene Chlorgas lichtaktiviert im Bereich 2000 - 4000 Angström, mit trockenem Stickstoff derart verdünnt wird, daß eine Chlorkonzentration zwischen 20 - 100 Vol.-% Chloranteil stattfindet, wobei die Gase im Umkreis gehalten werden, was der Belastung der Atmosphäre nach den gültigen Chlorvorschriften entspräche.To avoid the damaging effects on PVC caused by heat to restrict a minimum, a working temperature of 800 C is not exceeded, wherein, according to the present additional invention, the active, dry chlorine gas light activated in the range 2000 - 4000 angstroms, with dry nitrogen like this is diluted that a chlorine concentration between 20 - 100 vol .-% chlorine content takes place, with the gases being kept in the vicinity, causing pollution of the atmosphere according to the valid chlorine regulations.
Nach der Nachbehandlung, die ca. 15 - 20 Minuten dauert, wird das im Umkreis gehaltene Gas über alkalische Lösungsmittel in die Atmosphäre abgeblasen. Die durch Wärme hervorgerufene schädigende Einwirkung wird auch dadurch weiterhin begrenzt, daß man vorteilhafterweise eine Chlorbehandlung als Prozeßstufe in dem Trocknungsprozeß der PVC-Herstellung nachschaltet, wobei das Endprodukt-PVC-Pulver auf Temperatur von 50 - 600 C prozeßseitig erwärmt wird. Dadurch beugt man einer Adsorption von Feuchtigkeit an der porösen Oberfläche von PVC während der Lagerung vor, was sonst eine übermäßige Korrosion während der Behandlung infolge der HCL-Entwicklung und oxidierenden Einwirkung von hypochloriger Säure zur Folge haben könnte, Bekanntlich fällt der Feuchtigkeitsgehalt von PVC in der ersten Zeit der Lagerung, um dann wieder allmählich anzusteigen.After the follow-up treatment, which lasts approx. 15-20 minutes, this will be Gas held in the vicinity is blown into the atmosphere via alkaline solvents. The damaging effect caused by heat will continue to do so limited that one advantageously a chlorine treatment as a process stage in the Downstream of the PVC production drying process, the end product being PVC powder is heated to a temperature of 50 - 600 C on the process side. This is how you bend one Adsorption of moisture on the porous surface of PVC during storage before what else is excessive corrosion during treatment as a result of HCL development and oxidizing action of hypochlorous acid, as is well known The moisture content of PVC falls during the first period of storage and then again to increase gradually.
E8 ist bekannt, daß Eisenverbindungen bei erhöhter Temperatur bei PVC eine Katalysatorrolle spielen und eine HCL-Abspaltung bewirken. Die dadurch entstehenden, kumulierten Doppelbindungen in der PVC-Polymer-Kette bewirken ihrerseits die gelbliche Verfärbung von PVC-Fertigprodukten. Normalerweise werden Eisenchloride mit Chlorstrom in die Reaktionszone hineingebracht.E8 is known that iron compounds at elevated temperature at PVC play a catalyst role and cause HCL to be split off. The thereby The resulting, accumulated double bonds in the PVC polymer chain are responsible for their part the yellowish discoloration of finished PVC products. Usually iron chlorides brought into the reaction zone with a stream of chlorine.
Die Eisenchloride sind nämlich die Korrosionsprodukte von Rohrleitungen.The iron chlorides are the corrosion products of pipelines.
Es ist deshalb unentbehrlich, die Rohrleitungen nach dem Chlorverteilerrohr wenigstens 10 - 15 Meter vor dem Reaktionsraum aus einem Nichteisenwerkstoff, z.B. Polyvinylchlorid oder Polyäthylen, herzustellen und noch kurz vor dem Reaktionsraum den Chlorstrom intensiv zu filtrieren.It is therefore essential to install the pipes after the chlorine distribution pipe at least 10-15 meters in front of the reaction space made of a non-ferrous material, e.g. Polyvinyl chloride or polyethylene to produce and just before the reaction chamber intensively filter the stream of chlorine.
Die Apparatur der Behandlungsstufe ist nach den Regeln der PVC-Herstellung aus Edelstahl hergestellt, die Rohrleitung und Armaturen aus dem Nachbehandlungsreaktor müssen aber aus einem indifferenten, temperaturbeständigen Kunststoff z.B. Polyäthylen, Polypropylen oder nachchlorierte PVC bestehen.The equipment of the treatment stage is according to the rules of PVC production made of stainless steel, the pipeline and fittings from the aftertreatment reactor but must be made of an indifferent, temperature-resistant plastic e.g. polyethylene, Polypropylene or post-chlorinated PVC.
Das erfindungsgemäß hergestellte, nachbehandelte Polyvinylchlorid weist nach dem Einsatz eines GascbGmatographen kombiniert mit der wHead-Space"-Technik ausgeführten Anlayse keinen Vinylchloridgehalt mehr auf. Das PVC-Fertigprodukt behält seine originelle, schneeweiße Färbung, und seine mechanischen Festigkeitswerte bleiben unverändert.The post-treated polyvinyl chloride produced according to the invention points to the use of a GascbGmatograph combined with the wHead-Space "technology The analysis carried out no longer shows any vinyl chloride content. The PVC finished product retains its original, snow-white coloring and its mechanical strength values remain unchanged.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19792908495 DE2908495A1 (en) | 1979-03-05 | 1979-03-05 | Vinyl chloride monomer removal from PVC - by circulating light-activated chlorine gas diluted with nitrogen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19792908495 DE2908495A1 (en) | 1979-03-05 | 1979-03-05 | Vinyl chloride monomer removal from PVC - by circulating light-activated chlorine gas diluted with nitrogen |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2908495A1 true DE2908495A1 (en) | 1980-09-11 |
Family
ID=6064505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19792908495 Ceased DE2908495A1 (en) | 1979-03-05 | 1979-03-05 | Vinyl chloride monomer removal from PVC - by circulating light-activated chlorine gas diluted with nitrogen |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2908495A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2451988A1 (en) * | 1974-11-02 | 1976-05-06 | Peters Ag Claudius | PROCESS AND DEVICE FOR REDUCING THE RESIDUAL MONOMER CONTENT OF POWDER AND / OR GRANULATE POLYMERIZATION PRODUCTS |
DE2524221A1 (en) * | 1975-05-31 | 1976-12-16 | Dynamit Nobel Ag | Reducing content of residual monomer in polymers - by treating with chlorine or chlorine forming agent |
DE2557654A1 (en) * | 1975-12-20 | 1977-06-30 | Hoechst Ag | Heat treatment of vinyl chloride homo-, graft or co-polymer - in gas stream contg. chlorine, reduces monomer content without discoloration |
DE2615200A1 (en) * | 1976-04-08 | 1977-10-27 | Hoechst Ag | Reduction of monomer content of solid PVC - by heat treatment with exposure to dilute chlorine |
-
1979
- 1979-03-05 DE DE19792908495 patent/DE2908495A1/en not_active Ceased
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2451988A1 (en) * | 1974-11-02 | 1976-05-06 | Peters Ag Claudius | PROCESS AND DEVICE FOR REDUCING THE RESIDUAL MONOMER CONTENT OF POWDER AND / OR GRANULATE POLYMERIZATION PRODUCTS |
DE2524221A1 (en) * | 1975-05-31 | 1976-12-16 | Dynamit Nobel Ag | Reducing content of residual monomer in polymers - by treating with chlorine or chlorine forming agent |
DE2557654A1 (en) * | 1975-12-20 | 1977-06-30 | Hoechst Ag | Heat treatment of vinyl chloride homo-, graft or co-polymer - in gas stream contg. chlorine, reduces monomer content without discoloration |
DE2615200A1 (en) * | 1976-04-08 | 1977-10-27 | Hoechst Ag | Reduction of monomer content of solid PVC - by heat treatment with exposure to dilute chlorine |
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Legal Events
Date | Code | Title | Description |
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OAP | Request for examination filed | ||
OD | Request for examination | ||
8127 | New person/name/address of the applicant |
Owner name: GATTYS TECHNIQUE S.A., FREIBURG/FRIBOURG, CH |
|
8128 | New person/name/address of the agent |
Representative=s name: EYER, E., DIPL.-ING. LINSER, H., PAT.-ANW., 6072 D |
|
8131 | Rejection |