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WO1982002543A1 - Procede de recuperation d'un exces de peinture pulverisee - Google Patents

Procede de recuperation d'un exces de peinture pulverisee Download PDF

Info

Publication number
WO1982002543A1
WO1982002543A1 PCT/US1981/000097 US8100097W WO8202543A1 WO 1982002543 A1 WO1982002543 A1 WO 1982002543A1 US 8100097 W US8100097 W US 8100097W WO 8202543 A1 WO8202543 A1 WO 8202543A1
Authority
WO
WIPO (PCT)
Prior art keywords
particles
paint
slurry
solid
water
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
Application number
PCT/US1981/000097
Other languages
English (en)
Inventor
Lawrence G Decker
James R Welch
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PCT/US1981/000097 priority Critical patent/WO1982002543A1/fr
Publication of WO1982002543A1 publication Critical patent/WO1982002543A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
    • B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
    • B01D45/10—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators which are wetted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/46—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material
    • B05B14/465—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material using substantially vertical liquid curtains or wetted walls behind the object to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/46—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material
    • B05B14/462—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material and separating the excess material from the washing liquid, e.g. for recovery
    • 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
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • This invention relates generally to a method for reclaiming paint overspray and more particularly to a method of separating paint overspray into reusable liquid and solid components.
  • Water wash ' paint booths are broadly used to capture excess paint particles in the form of overspray and prevent the discharge of such particles into the atmosphere.
  • the treatment of waste water from spray paint booths has been a long standing problem.
  • Increasingly stringent environmental control laws require that waste water containing suspended paint particles must be disposed of only at approved chemical waste sites.
  • the number of approved and licensed disposal sites has steadily decreased over the past few years while the demand for such sites has increased. Accordingly, the cost of disposing of paint sludge materials has risen sharply and, in some cases, is now approaching the original cost of the paint.
  • the Inoue, et al process includes the addition of both an acidic agent and an alkaline agent to form an insoluble salt, resulting in the disposition of the paint particles as a non-adhesive coagulation product.
  • U.S. Patent 3,736,277 issued to Howard S.
  • Eender on May 29, 1973 discloses a method for reclaiming a solvent-based paint overspray by chemically treating paint booth wash water containing the overspray to form a sludge product, skimming the sludge, and subsequently dredging the skimmed sludge.
  • U.S. Patent 4,096,061 issued to Thomas P. Brennan on June 20, 1978 discloses a process for chemically treating paint booth waste water containing dispersed latex paint particles to produce a reusable sludge product.
  • Patent 4,102,303 issued to Andre Guy Cordier, et al, on July 25, 1978 discloses a method for continuously chemically treating a portion of the paint booth waste water to separate paint overspray particles from the waste water which, after treatment, is returned to the paint booth for reuse.
  • Electrostatic separation process overcomes many of the problems inherent in chemical treatment processes, it is sensitive to the type of paint particles contained in the waste water. Electrostatic treatment is dependent upon both the physical and electrical properties of the material being treated, and is generally limited to use with solvent-based paint systems.
  • the present invention is directed to overcoming one or more of the problems as set forth
  • a method for reclaiming paint overspray particles includes collecting an effluent containing o the overspray particles, separating the particles in the effluent and forming a slurry containing the particles, and centrifugally separating the slurry into solid and liquid components.
  • Electrostatic separation of paint particles contained in paint booth waste water is generally limited to use in solvent-based paint systems.
  • a multitude of chemical processes have been developed for specifically treating particular paint compositions.
  • chemical treatments are generally costly, use consumable materials in the treatment process, and often yield a product that is contaminated as a result of reaction with the treating agents.
  • the present invention employs mechanical separation techniques to separate paint booth waste water into solid and liquid components. Both of the components produced are reusable and the process is broadly applicable to all types of paint particles.
  • the single figure of the drawing is a schematic view of a system for reclaiming paint overspray according to an embodiment of the present invention.
  • a system for reclaiming paint overspray particles according to the method of the present invention is generally indicated by the reference numeral 10.
  • the system 10 is shown in conjunction with a paint spray booth 12 having a spray gun 14 for directing atomized paint particles 16 towards a workpiece 18, and a water curtain 20 cascading down at least one wall of the booth 12.
  • Water for the curtain 20 is pumped into the booth 12 from a supply tank 21.
  • Alternate paint booth configurations may additionally use water, in the form of a curtain or spray, as a filter medium for air exhausted from the paint booth. In all cases, the purpose of the water is to capture and hold in_suspension the paint particles 16, known as overspray, which are not deposited on the workpiece.
  • the water curtain 20 containing the suspended paint overspray particles 16 forms an effluent 22 which flows downwardly and is discharged into a collection tank 24 positioned elevationally below the paint booth 12.
  • the collection tank 24 includes a traveling screen filter 26 disposed at one end of the tank 24 for separating material from the effluent into low and high solids content fractions and transferring the high solids content fraction as a slurry 27 to a holding tank 28.
  • a conduit ' 30 extends upwardly from the holding tank 28 and includes an in-line pump 32 for pumping the slurry 27 from the holding tank 28 to a mixing tank 34.
  • the mixing tank 34 typically has a capacity of about 7500 litres (2000 gallons) and includes a motor-driven mixer 36 positioned within the mixing tank 34.
  • a supply line 38 extends between the water supply tank 21 and the mixing tank 34.
  • a pump 40 is disposed in the supply line 38 so that water from the supply tank 21 may be selectively pumped into the mixing tank 34 to controllably dilute the slurry contained within the mixing tank 34 to form a diluted slurry 41.
  • a transfer pump 42 is positioned at a lower discharge end of the mixing tank 34 and is connected to a conduit 44 extending between the transfer pump 42 and the inlet end of a decanter centrifuge 46.
  • the decanter centrifuge 46 is well known in the art and is typically used for continuous clarification, dewatering or de-oiling of suspensions in various industries.
  • One such decanter centrifuge suitable for the method of the present invention is an Alfa-Laval Model No. 207 liquid-solids centrifuge available from the DeLaval Separator Company, Poughkeepsie, N.Y.
  • the decanter centrifuge has a first outlet 48 for discharging a separated solid component 50 and a second outlet 52 for discharging a separated liquid component 54.
  • the receiving station of a conveyor 56 is positioned elevationally below the first outlet 48 of the decanter centrifuge 46.
  • a container 58 is positioned elevationally below the discharge station of the conveyor 56.
  • the second outlet 52 of the decanter centrifuge is in communication with a pump 60 positioned between the second outlet 52 and a liquid component return line 62 extending between the pump 60
  • An additional pump 64 is positioned between an intake line 66 terminating in an upper portion of the collection tank 24 and a return line 68 extending between the pump 64 and the water supply tank 21.
  • the effluent 22 containing paint particles 16 suspended in water drains from the paint booth 12 into the collection tank 24.
  • the suspended particles are partially separated from the water by any one, or combination, of several known methods.
  • a traveling bed filter 26 is used to separate the overspray particles 16 from the water carrier and transfer the resultant slurry 27 typically containing approximately 10% solid particles into the holding tank 28.
  • the overspray particles may be separated by settling out onto the bottom of the collection tank.
  • the upper clarified water is first pumped through the return line 68 and into the water supply tank 21 by the pump 64.
  • the slurry 27 remaining in the lower portions of the collection tank typically contains approximately 50% solid ' particles, and is manually removed from the collection tank 24 by shoveling or pumping into the holding tank 28.
  • the effluent 22 may be chemically treated with any one of several well known commercial flocculating agents to aid in the above-described separation procedures.
  • the slurry 27 is pumped from the holding tank
  • a diluted slurry 41 desirably containing solid particles in the range of about 5% to 30%. It has been found that pumping and processing difficulties will occur if the solid content of the slurry 41 is greater than 30%. Operating inefficiencies will be encountered if the slurry 41 is over-diluted to the point where it contains less than 5% solid particles.
  • the slurry 41 is pumped from the mixing tank 34, through the conduit 44, to a central inlet port of the decanter centrifuge 46.
  • the slurry 41 is distributed by centrifugal force onto the wall of a cavity inside the decanter centrifuge 46.
  • a solid component 50 is deposited as a layer on the rotor wall thus leaving the liquid component 54 to form a radially inner ring, the depth of which is adjustable.
  • a screw conveyor in the decanter centrifuge 46 transports the solid component 50 towards the first outlet 48 where it discharged by centrifugal force through the first outlet 48 and onto the conveyor 56.
  • the solid component 50 After centrifugal separation, the solid component 50 typically contains greater than about 75% by weight solid particles and is acceptable for use as a base for reclaimed paint products. As an added benefit, the solid component 50, being condensed and having a much smaller volume than the slurry 27 from which it was derived, generally qualifies as a "dry" disposable product. If desired for handling and future processing expediencies, the solid component 50 may be easily air dried or heated in an oven to reduce the moisture content to less than about 1% by weight.
  • the processed liquid component 54 in excess of that required to maintain the predetermined adjustable depth in the decanter centrifuge is discharged by gravity into the second outlet 52, and is then pumped through the return line 68 the water supply tank 21.
  • the liquid component 54 typically contains less than 1% by weight solid particles and is highly acceptable for reuse in the paint booth water curtain 20.
  • the process of the present invention is particularly effective for reclaiming water-borne paint overspray particles.
  • an effluent 22 having a 10% solids content was collected from a spray paint booth 12 using water-borne paint.
  • the liquid component 54 contained only 0.2%, by weight, solids and the solid component 50 contained about 80%, by weight, solids.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Procede de separation de l'exces d'une peinture pulverisee en composants liquides (54) et solides (50) reutilisables. Les procedes de separation connus actuellement necessitent generalement un traitement thermique qui s'avere couteux et qui altere les proprietes du produit recupere. D'autres techniques de separation ne sont efficaces que sur certains types de peintures. La presente invention resout les problemes mentionnes plus haut en proposant un procede qui consiste a former une boue (27) contenant des particules solides (16) dans une gamme preselectionnee et a separer par centrifugation la boue (27) en composants liquides (54) et solides (50). Le procede est particulierement efficace pour la recuperation de particules de peinture en suspension dans l'eau.
PCT/US1981/000097 1981-01-19 1981-01-19 Procede de recuperation d'un exces de peinture pulverisee Ceased WO1982002543A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1981/000097 WO1982002543A1 (fr) 1981-01-19 1981-01-19 Procede de recuperation d'un exces de peinture pulverisee

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US1981/000097 WO1982002543A1 (fr) 1981-01-19 1981-01-19 Procede de recuperation d'un exces de peinture pulverisee
WOUS81/00097810119 1981-01-19

Publications (1)

Publication Number Publication Date
WO1982002543A1 true WO1982002543A1 (fr) 1982-08-05

Family

ID=22161059

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1981/000097 Ceased WO1982002543A1 (fr) 1981-01-19 1981-01-19 Procede de recuperation d'un exces de peinture pulverisee

Country Status (1)

Country Link
WO (1) WO1982002543A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8808933U1 (de) * 1988-07-12 1988-10-27 Ipsen, Harald, 6054 Rodgau Wassersammelbecken einer Spritzkabine
US5062963A (en) * 1989-03-17 1991-11-05 Devilbiss (Canada) Limited Method and apparatus for removing sludge from a spray booth
US5360539A (en) * 1992-07-27 1994-11-01 Abb Flakt Aktiebolag Scrubbing water handling system for paint spray booths
US5393390A (en) * 1991-05-08 1995-02-28 Akzo Nobel Nv Treatment and recycling of overspray from the spray application of waterborne coatings
WO2006051116A1 (fr) * 2004-11-15 2006-05-18 Solvay (Société Anonyme) Procede pour purifier une solution contenant une matiere plastique

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001293A (en) * 1954-08-17 1961-09-26 Vaw Ver Aluminium Werke Ag Process and installation for the dehydration of sludges
GB983760A (en) * 1962-02-20 1965-02-17 Ici Ltd Apparatus and method for separating particles in liquids
US3409275A (en) * 1967-01-31 1968-11-05 William F. Miller Portable washer and collection tank assembly
US3725266A (en) * 1971-08-12 1973-04-03 Haviland Prod Co Process for removing metal compound contaminants from waste water
US3834128A (en) * 1972-12-04 1974-09-10 Environmental Maintenance Corp Liquid clarifying apparatus for removing particles from a gas stream
US4055404A (en) * 1974-07-10 1977-10-25 Wolfgang Daimer Process for collecting paint spray mists in spray paint operation
US4071449A (en) * 1975-02-19 1978-01-31 Nippon Paint Co., Ltd. Process for treatment of waste water exhausted from water-wash spray booth using water-soluble paint
US4096061A (en) * 1977-01-05 1978-06-20 Drew Chemical Corporation Recovery and reuse of paint solids from waste water
US4102303A (en) * 1974-11-18 1978-07-25 Air Industrie Process and paint spray booth using a washing liquid and reuse thereof
US4206053A (en) * 1977-08-04 1980-06-03 Maschinenfabrik Buckau R. Wolf Aktiengesellschaft Method of dewatering froth fines
US4261707A (en) * 1979-09-12 1981-04-14 Schweitzer Industrial Corp. Process and system for elimination of paint solvent vapors
US4265642A (en) * 1979-03-01 1981-05-05 Abcor, Inc. Process of removal of solvent vapors

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001293A (en) * 1954-08-17 1961-09-26 Vaw Ver Aluminium Werke Ag Process and installation for the dehydration of sludges
GB983760A (en) * 1962-02-20 1965-02-17 Ici Ltd Apparatus and method for separating particles in liquids
US3409275A (en) * 1967-01-31 1968-11-05 William F. Miller Portable washer and collection tank assembly
US3725266A (en) * 1971-08-12 1973-04-03 Haviland Prod Co Process for removing metal compound contaminants from waste water
US3834128A (en) * 1972-12-04 1974-09-10 Environmental Maintenance Corp Liquid clarifying apparatus for removing particles from a gas stream
US4055404A (en) * 1974-07-10 1977-10-25 Wolfgang Daimer Process for collecting paint spray mists in spray paint operation
US4102303A (en) * 1974-11-18 1978-07-25 Air Industrie Process and paint spray booth using a washing liquid and reuse thereof
US4071449A (en) * 1975-02-19 1978-01-31 Nippon Paint Co., Ltd. Process for treatment of waste water exhausted from water-wash spray booth using water-soluble paint
US4096061A (en) * 1977-01-05 1978-06-20 Drew Chemical Corporation Recovery and reuse of paint solids from waste water
US4206053A (en) * 1977-08-04 1980-06-03 Maschinenfabrik Buckau R. Wolf Aktiengesellschaft Method of dewatering froth fines
US4265642A (en) * 1979-03-01 1981-05-05 Abcor, Inc. Process of removal of solvent vapors
US4261707A (en) * 1979-09-12 1981-04-14 Schweitzer Industrial Corp. Process and system for elimination of paint solvent vapors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Perry's Chemical Engineers Handbook", MCGRAW-HILL BOOK CO., NEW YORK *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8808933U1 (de) * 1988-07-12 1988-10-27 Ipsen, Harald, 6054 Rodgau Wassersammelbecken einer Spritzkabine
US5062963A (en) * 1989-03-17 1991-11-05 Devilbiss (Canada) Limited Method and apparatus for removing sludge from a spray booth
US5393390A (en) * 1991-05-08 1995-02-28 Akzo Nobel Nv Treatment and recycling of overspray from the spray application of waterborne coatings
US5360539A (en) * 1992-07-27 1994-11-01 Abb Flakt Aktiebolag Scrubbing water handling system for paint spray booths
WO2006051116A1 (fr) * 2004-11-15 2006-05-18 Solvay (Société Anonyme) Procede pour purifier une solution contenant une matiere plastique
FR2877949A1 (fr) * 2004-11-15 2006-05-19 Solvay Sa Sa Belge Procede d'epuration d'une solution de matiere plastique
JP2008519878A (ja) * 2004-11-15 2008-06-12 ソルヴェイ（ソシエテ アノニム） プラスチック材料を含有する溶液の精製方法
JP4785860B2 (ja) * 2004-11-15 2011-10-05 ソルヴェイ（ソシエテ アノニム） プラスチック材料を含有する溶液の精製方法
US8338563B2 (en) 2004-11-15 2012-12-25 Solvay (Societe Anonyme) Method for purifying a plastic solution

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