DE3531514C1 - Process for the decomposition of plastic or paint residues by pyrolysis in a fluidized bed - Google Patents

Process for the decomposition of plastic or paint residues by pyrolysis in a fluidized bed

Info

Publication number
DE3531514C1
DE3531514C1 DE3531514A DE3531514A DE3531514C1 DE 3531514 C1 DE3531514 C1 DE 3531514C1 DE 3531514 A DE3531514 A DE 3531514A DE 3531514 A DE3531514 A DE 3531514A DE 3531514 C1 DE3531514 C1 DE 3531514C1
Authority
DE
Germany
Prior art keywords
fluidized bed
pyrolysis
paint
decomposition
plastic
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
Application number
DE3531514A
Other languages
German (de)
Inventor
Herbert Dr-Ing Kohler
Johann Dipl-In Halbartschlager
Werner Dipl-Ing Aufschneider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daimler Benz AG filed Critical Daimler Benz AG
Priority to DE3531514A priority Critical patent/DE3531514C1/en
Application granted granted Critical
Publication of DE3531514C1 publication Critical patent/DE3531514C1/en
Expired legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B49/00Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated
    • C10B49/02Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge
    • C10B49/04Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge while moving the solid material to be treated
    • C10B49/08Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge while moving the solid material to be treated in dispersed form
    • C10B49/10Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge while moving the solid material to be treated in dispersed form according to the "fluidised bed" technique
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • C10B53/07Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of solid raw materials consisting of synthetic polymeric materials, e.g. tyres
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/141Feedstock
    • Y02P20/143Feedstock the feedstock being recycled material, e.g. plastics

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Treatment Of Sludge (AREA)

Abstract

A process for the decomposition of plastic or paint residues, in particular polymeric coatings on metal parts, by pyrolysis in a fluidized bed is described in which, in order to render the pyrolysis gases inert, a cooling liquid which comprises the effluent from the dewatering of paint sludge is sprayed into the cavity above the fluidized bed. The use of this effluent as cooling liquid means that not only is the effluent disposed of inexpensively, but additional energy is provided for the thermal incineration following pyrolysis.

Description

Gegenstand der Erfindung ist ein Verfahren zur Zersetzung von Kunststoff- oder Lackrückständen, insbesondere von polymeren Überzügen auf Metallteilen, durch Pyrolyse in einem Wirbelbett, wobei zur Inertisierung der Pyrolysegase in den Leerraum ober­ halb des Wirbelbettes eine Flüssigkeit eingespritzt wird.The invention relates to a process for the decomposition of Plastic or lacquer residues, especially of polymers Coatings on metal parts, by pyrolysis in a fluidized bed, whereby for inerting the pyrolysis gases in the empty space above a liquid is injected half of the fluidized bed.

Verfahren zur Pyrolyse von Kunststoff- oder Lackrückständen zum Zwecke des besonders schonenden Entlackens von Metallteilen oder zur Aufarbeitung von Lackschlämmen sind seit Jahren be­ kannt (z. B. DE-PS 23 15 958 oder DE-PS 23 37 894).Process for pyrolysis of plastic or paint residues for the particularly gentle stripping of metal parts or for processing paint sludge have been for years knows (e.g. DE-PS 23 15 958 or DE-PS 23 37 894).

Bei diesen Verfahren wird ein Wirbelbett aus Aluminiumoxid oder Sand benutzt, das durch Einblasen eines vorgeheizten sauerstoff­ haltigen Gases, im allgemeinen Luft, über eine durchlässige Bo­ denplatte fluidisiert wird. Die zu entlackenden Metallteile oder der zu zersetzende Lackschlamm wird in dieses Wirbelbett gegeben und dort bei einer Temperatur, die im allgemeinen zwischen etwa 400 und 650°C liegt, zur weitgehenden Zersetzung der orga­ nischen Bestandteile belassen. Die Verschwelungsdauer der orga­ nischen Anteile des Lackes liegt je nach der Schichtdicke zwi­ schen 2 und etwa 45 min. Die Pyrolyseabgase werden dann im all­ gemeinen einer Anlage zur thermischen Nachverbrennung zugeführt, in der die in ihnen noch enthaltenen brennbaren Bestandteile völlig zerstört werden. Um Explosionen in dem oberhalb des Wirbelbettes befindlichen Leerraum oder eine Überhitzung des Wirbelbettes durch eine in das Wirbelbett zurückschlagende Flammenfront zu vermeiden, wird dieser Raum durch Zugabe eines inerten Gases oder durch Einspritzen einer Flüssigkeit, insbesondere Wasser inertisiert. Der Erfindung liegt die Aufgabe zugrunde, diese Inertisierung besonders wirtschaftlich durchzu­ führen.In this process, a fluidized bed made of alumina or Sand used by blowing a preheated oxygen containing gas, generally air, via a permeable Bo the plate is fluidized. The metal parts to be stripped or the paint sludge to be decomposed is placed in this fluidized bed and there at a temperature that is generally between about 400 and 650 ° C, for the extensive decomposition of the orga leave African components. The duration of the smoldering of the organization African proportions of the paint is between two depending on the layer thickness 2 and about 45 min. The pyrolysis gases are then in space  fed to a system for thermal afterburning, in which the combustible components still contained in them be completely destroyed. To explosions in the above the Fluidized bed or an overheating of the Fluidized bed by one that bounces back into the fluidized bed To avoid flame front, this room is added by adding a inert gas or by injecting a liquid, in particular water inertized. The object of the invention is to achieve this is based on carrying out this inerting particularly economically to lead.

Erfindungsgemäß wird hierfür vorgeschlagen, daß als Flüssig­ keit für die Inertisierung der Pyrolysegase das bei der Entwässe­ rung von Lackschlamm anfallende Abwasser verwendet wird.According to the invention it is proposed that as liquid pyrolysis gases for dewatering wastewater from paint sludge is used.

In Lackspritzkabinen werden bekanntlich die Lacknebel aus der Kabinenabluft durch eine Wasserwäsche niedergeschlagen. Es ent­ steht eine Suspension von Lackteilchen in Wasser, der soge­ nannte Lackschlamm. Vor der Deponierung des Lackschlammes bzw. der Verbrennung oder der Pyrolyse muß der Lackschlamm soweit wie möglich von Wasser befreit werden, was im allgemeinen durch De­ kantieren, Aufrahmen und dergleichen geschieht. Das von den Lack­ teilchen befreite Abwasser kann aber nicht ohne weiteres ent­ sorgt werden, da es noch Lösemittel aus dem Lack gelöst enthält. Es ist daher eine relativ aufwendige Aufarbeitung des bei der Lackschlammkonzentrierung anfallenden Abwassers erforderlich.In paint spray booths, it is known that the paint mist from the Exhaust air from the cabin suppressed by a water wash. It ent is a suspension of paint particles in water, the so-called called paint sludge. Before depositing the paint sludge or the incineration or pyrolysis, the paint sludge as far as possible to be freed of water, which is generally determined by De edging, creaming and the like happens. The paint Waste water that has been freed from particles cannot easily be removed be taken care of, since it still contains solvents dissolved from the paint. It is therefore a relatively complex work-up of the Lacquer sludge concentration of waste water required.

Gemäß der Erfindung wird dieses Lackabwasser zur Inertiserung der Pyrolysegase in den Leerraum oberhalb des Wirbelbettes als Kühlflüssigkeit eingespritzt. Das Lackabwasser verdampft, kühlt und inertisiert die Pyrolyseabgase. In der nachfolgenden thermischen Nachverbrennung, in der die Pyrolyseabgase weiter­ behandelt werden, wird auch der in dem Lackabwasser enthaltene Anteil an organischen Lösemitteln mitverbrannt. Auf diese Weise wird nicht nur das Lackabwasser preiswert entsorgt, sondern die organischen Bestandteile des Lackabwassers leisten auch noch einen zusätzlichen Beitrag zur Verbrennungswärme, so daß die thermische Nachverbrennung insgesamt energiekostengünstiger verläuft. Sofern bei der Pyrolyse der auf den Metallteilen be­ findlichen Lack- bzw. Kunststoffschichten oder bei der Pyrolyse des Lackschlammes saure Zersetzungsprodukte, wie HCl oder SO2, entstehen, ist es bekannt, diese Abgase durch Zugabe von alkali­ schen Feststoffen zum Wirbelbett zu beseitigen. Es hat sich ge­ zeigt, daß eine besonders vollständige Reaktion der sauren Be­ standteile erreicht werden kann, wenn die alkalischen Stoffe dem zur Inertisierung in den Leerraum oberhalb des Wirbelbettes ein­ gespritzten Wasser zugesetzt werden. Als Alkalien werden insbeson­ dere bevorzugt die Alkali- oder Erdalkalioxide, -hydroxide oder -carbonate sowie Ammoniak zugegeben. Dabei ist es natürlich erforderlich, daß nur solche Verbindungen ausgewählt werden, die auch wasser­ löslich sind. Anstelle von Ammoniak können auch organische ba­ sische Verbindungen wie z. B. Amine, z. B. Methyl- oder Ethylamin, Ethanolamin und dergleichen Verwendung finden. Die Verwendung dieser Substanzen wird aber im allgemeinen aus Kostengründen nur in Ausnahmefällen erfolgen.According to the invention, this paint waste water is injected into the empty space above the fluidized bed as a cooling liquid for the inertization of the pyrolysis gases. The paint waste water evaporates, cools and inertizes the pyrolysis gases. In the subsequent thermal post-combustion, in which the pyrolysis gases are treated further, the proportion of organic solvents contained in the paint waste water is also burned. In this way, not only is the paint waste water disposed of inexpensively, but the organic constituents of the paint waste water also make an additional contribution to the heat of combustion, so that the thermal post-combustion is generally more energy-efficient. If acidic decomposition products such as HCl or SO 2 are formed during the pyrolysis of the lacquer or plastic layers on the metal parts or during the pyrolysis of the lacquer sludge, it is known to eliminate these exhaust gases by adding alkali solids to the fluidized bed. It has been shown that a particularly complete reaction of the acidic constituents can be achieved if the alkaline substances are added to the sprayed water for inertization in the empty space above the fluidized bed. As alkalis, the alkali or alkaline earth oxides, hydroxides or carbonates and ammonia are particularly preferably added. It is of course necessary to select only those compounds which are also water-soluble. Instead of ammonia, organic compounds such as z. B. amines, e.g. B. methyl or ethylamine, ethanolamine and the like are used. However, these substances will generally only be used in exceptional cases for cost reasons.

Claims (2)

1. Verfahren zur Zersetzung von Kunststoff- oder Lackrückständen insbesondere von polymeren Überzügen auf Metallteilen, durch Pyrolyse in einem Wirbelbett, wobei zur Inertisierung der Pyro­ lysegase in den Leerraum oberhalb des Wirbelbettes eine Flüssigkeit eingespritzt wird, dadurch gekennzeichnet, daß als Flüssigkeit das bei der Entwässerung von Lackschlamm anfallende Abwasser verwendet wird.1. Process for the decomposition of plastic or lacquer residues, in particular polymeric coatings on metal parts, by pyrolysis in a fluidized bed, a liquid being injected into the void above the fluidized bed for inerting the pyro lysis gases, characterized in that the liquid used for dewatering waste water from paint sludge is used. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß dem Abwasser basische Stoffe, insbesondere Alkali- oder Erdalkali-oxide, -hydroxide oder -carbonate oder Ammoniak zu­ gesetzt werden.2. The method according to claim 1, characterized, that the wastewater basic substances, especially alkali or Alkaline earth metal oxides, hydroxides or carbonates or ammonia be set.
DE3531514A 1985-09-04 1985-09-04 Process for the decomposition of plastic or paint residues by pyrolysis in a fluidized bed Expired DE3531514C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE3531514A DE3531514C1 (en) 1985-09-04 1985-09-04 Process for the decomposition of plastic or paint residues by pyrolysis in a fluidized bed

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3531514A DE3531514C1 (en) 1985-09-04 1985-09-04 Process for the decomposition of plastic or paint residues by pyrolysis in a fluidized bed

Publications (1)

Publication Number Publication Date
DE3531514C1 true DE3531514C1 (en) 1987-04-09

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Country Link
DE (1) DE3531514C1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995026127A2 (en) * 1994-03-25 1995-10-05 Science-Technical And Product-Innovative Center 'tokema' Method of treating plastic waste
WO2000006668A1 (en) * 1998-07-29 2000-02-10 Nippon Steel Corporation Method for processing chlorine-containing organic compounds
US6329496B1 (en) 1998-07-29 2001-12-11 Nippon Steel Corporation Method for processing chlorine-containing organic compounds

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995026127A2 (en) * 1994-03-25 1995-10-05 Science-Technical And Product-Innovative Center 'tokema' Method of treating plastic waste
WO1995026127A3 (en) * 1994-03-25 1996-02-08 Science Technical And Product Method of treating plastic waste
WO2000006668A1 (en) * 1998-07-29 2000-02-10 Nippon Steel Corporation Method for processing chlorine-containing organic compounds
US6329496B1 (en) 1998-07-29 2001-12-11 Nippon Steel Corporation Method for processing chlorine-containing organic compounds

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Legal Events

Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee