GB2063096A - Process for purifying exhaust air from spraying booths - Google Patents
Process for purifying exhaust air from spraying booths Download PDFInfo
- Publication number
- GB2063096A GB2063096A GB8035439A GB8035439A GB2063096A GB 2063096 A GB2063096 A GB 2063096A GB 8035439 A GB8035439 A GB 8035439A GB 8035439 A GB8035439 A GB 8035439A GB 2063096 A GB2063096 A GB 2063096A
- Authority
- GB
- United Kingdom
- Prior art keywords
- scrubbing
- paint
- emulsifier
- exhaust air
- purifying exhaust
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005507 spraying Methods 0.000 title claims description 7
- 238000005201 scrubbing Methods 0.000 claims abstract description 42
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 13
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000839 emulsion Substances 0.000 claims abstract description 8
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 8
- 239000003595 mist Substances 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims abstract description 7
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 21
- 239000000706 filtrate Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 239000003973 paint Substances 0.000 description 26
- 238000009434 installation Methods 0.000 description 10
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 235000014113 dietary fatty acids Nutrition 0.000 description 6
- 239000000194 fatty acid Substances 0.000 description 6
- 229930195729 fatty acid Natural products 0.000 description 6
- 150000004665 fatty acids Chemical class 0.000 description 5
- 239000012465 retentate Substances 0.000 description 5
- 230000004520 agglutination Effects 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000006260 foam Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical class OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001804 emulsifying effect Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 150000002334 glycols Chemical class 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 125000000022 2-aminoethyl group Chemical group [H]C([*])([H])C([H])([H])N([H])[H] 0.000 description 1
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 239000004471 Glycine Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- ULUAUXLGCMPNKK-UHFFFAOYSA-N Sulfobutanedioic acid Chemical class OC(=O)CC(C(O)=O)S(O)(=O)=O ULUAUXLGCMPNKK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- MOTZDAYCYVMXPC-UHFFFAOYSA-N dodecyl hydrogen sulfate Chemical compound CCCCCCCCCCCCOS(O)(=O)=O MOTZDAYCYVMXPC-UHFFFAOYSA-N 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- -1 fatty acid esters Chemical class 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 150000008040 ionic compounds Chemical class 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229940049964 oleate Drugs 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920001522 polyglycol ester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003856 quaternary ammonium compounds Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/18—Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
-
- 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
- B05B14/463—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 by means of ultrafiltration
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Separation Of Particles Using Liquids (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
In a process for purifying exhaust air from paint-spraying-booths by scrubbing the spray mist with a scrubbing medium, particularly water, the spray particles are emulsified in the scrubbing medium with the addition of an emulsifier, at least a part of the emulsion is subjected to ultrafiltration and the ultra-filtrate is re-used as scrubbing medium. Among substances which can be used as emulsifier, are paraffin-sulphonates, olefin- sulphonates, alkylbenzenesulphonates, polyhydric alcohols, and diethylene glycol.
Description
SPECIFICATION
Process for purifying exhaust air from spraying booths
This invention relates to a process for purifying exhaust air from booths for the spraying of paint, lacquer, varnish or the like coating material, hereinafter referred to as paint, by scrubbing the paint mist with water or other scrubbing medium.
In such spraying booths, the atomised paint mist which does not pass onto the component to be coated is extracted from the booth together with air in the booth. For environmental-hygenic reasons, the paint mist must be removed from this air before the air passes into the open. In general, this is effected by scrubbing with water. The air is mixed intensively with the scrubbing water, the paint particles remaining in the water. The water contains a coagulating agent which causes the small paint particles to coalesce, i.e. to coagulate, into larger units, reduces the tackiness of the small particles in order to avoid agglutination and contamination in the scrubbing installation and causes the particles to float up orto sink down in a settling basin.
With the continuing progress in the development of coating materials, however, it becomes increasingly difficult to coagulate the particles to an adequate extent and this leads to extensive agglutination and contamination in the scrubbing installation. To ensure reliable functioning of the installation, such agglutinations and contaminations must be removed by laborious and expensive manual cleaning.
The present invention seeks to provide a process for purifying exhaust air from spraying booths, by scrubbing the spray mist with water or other scrubbing medium, with which contamination and agglutination due to deposition of paint within the scrubbing installation substantially no longer occur.
According to the invention, in a process for purifying exhaust air from paint-spraying booths by scrubbing the spray mist with a scrubbing medium, the spray particles are emulsified in the scrubbing medium with the addition of an emulsifier, at least a part of the emulsion is subjected to ultrafiltration and the ultrafiltrate is re-used as scrubbing medium.
In contrast with the hitherto customary process, the small paint particles in the scrubbing water are no longer coagulated, that is to say caused to coalesce and disagglutinate, but are emulsified by means of an emulsifier, that is coalescence of the dispersed particles is deliberately prevented, the stability of the dispersion is increased and creaming and phase separation are avoided. After the ultrafiltrate has been recycled to the scrubbing installation, the paint concentrate or retentate may be dumped as hitherto or reprocessed into paint which can be reused on some parts of a vehicle body, such as internal components, cavities and the like.
The emulsifiers used are such as are customary in industry. Emulsifiers of the anionic type, for example salts of higher-molecular fatty acids (C8-C18), salts of sulphuric acid esters, such as Na lauryl-sulphate.
Na salts of sulphosuccinic acid dialkyl esters or sulphuric acid esters of ethoxylated fatty alchohols and alkylphenols, or salts of sulphonic acids, such as alkylbenzene-sulphonates, xylene- and napthanlene- sulphonates, alkylnapthalene-sulphonates, paraffinor olefin-sulphonates, or the products of an addition reaction of fatty acids with various hydrophilic groups, such as protein or albumen condensation products or phosphates.
Furthermore, use may be made of cationic emulsifiers, for example fatty amines, quaternary ammonium compounds and the like, and ampholytic compounds, such as long-chain substituted amino acids, for example N-alkyl-di(aminoethyl)-glycine or
N-alkyl-2-aminopropionate or betaines, for example (3-acylamino-propyl)-dimethylglycine or alkylimidazolium betaines.
Afurther known group of emulsifiers, which can be used, consists of non-ionic compounds, for example partial esters of polyalcohols, such as glycerol mono-di-stearates and glycerol mono- dioleates, sorbitol mono-stearate and -oleate, ethylene oxide or propyiene oxide adducts with fatty acids, fatty alcohols, partial fatty acids or fatty acid esters of polyvalent or polyhydric alcohols or alkylphenols, or polyalkylene glycols. Other known emulsifiers, such as cellulose derivatives (cellulose ethers and the like) or synthetic high polymers, such as polyvinyl alcohols, can also be employed. In many cases, it is also advantageious to employ mixtures of different emulsifiers, provided they are chemically compatible with one another.
It is also advantageous to employ solubilisers, such as polyvalent or polyhydric alcohols, for example glycols. These compounds may be used together with other emulsifiers, but may advantageously ne used by themselves, since they possess good emulsifying activity and, on filtration remain in the permeate. In some cases, it may also be advantageous to use, as an emulsifier in addition to the other emulsifiers or by itself, high-polymeric types, such a polyvinyl alcohols (PVA) or carboxyvinyl polymers, since they produce less foam. To avoid excessive foaming of the scrubbing water and hence an adverse effect on the capacity of the scrubbing installation, it may become necessary to add appropriate quantities of conventional foam inhibitors to the scrubbing water, for example long-chain alchohols, highly polymeric glycols, fatty acid polyglycol esters and the like.If the paint is to be recovered from the retentate, silicone-containing foam inhibitors should not be used, since they have a disadvantageous influence on the quality of the paint.
Instead of water, it is possible to employ other liquids in which the paint can be dispersed.
The quantity of emulsifier required for emulsification, that is to say the quantity which effects adequate stabilisation of the paint particles in the scrubbing medium and prevents fouling of the scrubbing installation, depends on the type of paint and on the emulsifier used. Any skilled person can readily determine this quantity by a few preliminary experiments. For paints of the polybutadienel styrene type, at present customarily used in the motor-vehicle industry, an emulsifier concentration of about 1 to 5% by weight in the scrubbing water suffices when diethylene glycol is used as emulsifier.
However, this range can only be taken as a guide.
Exact values must be determined individually for every paint/emulsifier system.
Since the scrubbing water is customarily circulated in the scrubbing installation, the paint concentration in the water (emulsion) would rise in the course of a period of operation. In order to hold the paint concentration in the emulsion down to a desirable low level of about 1 to 5% by weight, a partial flow is withdrawn from the circulating emulsion and is subjected to ultrafiltration. The filtration of a partial flow is generally sufficient for maintaining a predetermined paint concentration in the emulsion and is normally less espensive than filtration of all the scrubbing water in every cycle.
Occasionally, however, the latter may be necessary.
In rate of the partial flow is made such that the same quantity of paint per unit of time is introduced into the scrubbing into the scrubbing water with the exhaust air from the booths as is removed with the partial flow.
From the ultrafiltration, a filtrate (permeate), which consists of pure scrubbing water and is recycled to the scrubbing water circulation and a highly concentrated paint emulsion (retentate) are obtained. The paint concentration in the retentate will amount to 20 to 30% by weight and, with multistage ultrafiltration, it may be as high as 40%. The ultrafiltration can be carried out in one of the numerous commercially available ultrafiltration units. Modern, commercially available, anisotropic plastic membranes which allow a high rate of filtration under low pressure, up to about 12 atmospheres, are preferred. The pore size of the membranes depends on the size of the small paint particles in the scrubbing water and can
be readily determined by an experienced person. In general, membranes having pore sizes of less than 0.1 um will be used.
The primary advantages which can be achieved by the invention are that fouling of the scrubbing
installation and resultant expensive cleaning operations are avoided as a result of the emulsifying
action. Moreover, the addition of emulsifier to the scrubbing water promotes the scrubbing of the paint
particles out of the air from the booths, so that less
expensive scrubbing apparatus can be used for the same degree of separation, or, with unchanged provision of apparatus, considerably more effective
purification of the exhaust air can be achieved.
Furthermore, very little pollution of the environment
is caused and the process is highly economical, as the ultrafiltrate is reused and water or chemicals
have to be replaced only to the extent to which they
are discharged with the retentate from the scrubbing
installation.
Claims (5)
1. A process for purifying exhaust air from paint-spraying-booths by scrubbing the spray mist with a scrubbing medium, wherein the spray parti
cles are emulsified in the scrubbing medium with the
addition of an emulsifier, at least a part of the
emulsion is subjected to ultrafiltration and the ultra4iltrate is re-used as scrubbing medium.
2. A process according to Claim 1, wherein paraffin-sulphonates, olefin-sulphonates or alkylbenzene-sulphonates are added as emulsifier.
3. A process according to Claim 1 wherein polyhydric alcohols are added as emulsifier.
4. A process according to Claim 3, wherein diethylene glycol is added as emulsifier.
5. A process for purifying exhaust air from paint-spraying booths substantially as hereinbefore described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792945523 DE2945523A1 (en) | 1979-11-10 | 1979-11-10 | METHOD FOR CLEANING EXHAUST AIR FROM PAINT SPRAYING CABINS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2063096A true GB2063096A (en) | 1981-06-03 |
Family
ID=6085709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8035439A Withdrawn GB2063096A (en) | 1979-11-10 | 1980-11-04 | Process for purifying exhaust air from spraying booths |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5695318A (en) |
| DE (1) | DE2945523A1 (en) |
| FR (1) | FR2469198A1 (en) |
| GB (1) | GB2063096A (en) |
| IT (1) | IT1165567B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU659726B2 (en) * | 1992-04-25 | 1995-05-25 | Herberts Gesellschaft Mit Beschrankter Haftung | Process for recovering the overspray of aqueous coating agents during spray application in spray booths |
| US5490939A (en) * | 1994-03-03 | 1996-02-13 | Bayer Aktiengesellschaft | Process for reconcentrating overspray from one-component coating compositions |
| EP0823275A1 (en) * | 1996-02-27 | 1998-02-11 | Nippon Paint Co., Ltd. | Method for suppressing foams in booth circulation water |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3143106A1 (en) * | 1981-10-30 | 1983-05-11 | Basf Ag, 6700 Ludwigshafen | Process and equipment for regenerating aqueous washing-out solutions of water-developable photosensitive recording materials |
| DE3832046A1 (en) * | 1988-09-21 | 1990-03-22 | Daimler Benz Ag | Process for treating paint mist wash water |
| CH680710A5 (en) * | 1989-12-22 | 1992-10-30 | Unicolor Ag | |
| US5282970A (en) * | 1991-04-09 | 1994-02-01 | Unicolor Ag | Method for environmentally benign paint spraying with an air-drying lacquer dissolved, emulgated or dispersed in water |
| DE4138088A1 (en) * | 1991-06-04 | 1992-04-16 | Unicolor Ag | Environment-friendly spray painting - where spray compsn. contains ultrafiltration throughput setting component and recirculated water conductivity is monitored |
| DE4133130A1 (en) * | 1991-10-05 | 1993-04-08 | Herberts Gmbh | METHOD FOR RECOVERY OF THE OVERSPRAY OF AQUEOUS COATING AGENTS ON THE SPRAY APPLICATION IN SPRAYING CABINS |
| DE4319994A1 (en) * | 1993-06-17 | 1994-12-22 | Bayer Ag | Process for concentration of paint overspray |
-
1979
- 1979-11-10 DE DE19792945523 patent/DE2945523A1/en not_active Withdrawn
-
1980
- 1980-11-04 GB GB8035439A patent/GB2063096A/en not_active Withdrawn
- 1980-11-07 IT IT50105/80A patent/IT1165567B/en active
- 1980-11-07 JP JP15604280A patent/JPS5695318A/en active Pending
- 1980-11-07 FR FR8023836A patent/FR2469198A1/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU659726B2 (en) * | 1992-04-25 | 1995-05-25 | Herberts Gesellschaft Mit Beschrankter Haftung | Process for recovering the overspray of aqueous coating agents during spray application in spray booths |
| US5453301A (en) * | 1992-04-25 | 1995-09-26 | Herberts Gesellschaft Mit Beschrankter Haftung | Process for recovering the overspray of aqueous coating agents during spray application in spray booths |
| US5490939A (en) * | 1994-03-03 | 1996-02-13 | Bayer Aktiengesellschaft | Process for reconcentrating overspray from one-component coating compositions |
| EP0823275A1 (en) * | 1996-02-27 | 1998-02-11 | Nippon Paint Co., Ltd. | Method for suppressing foams in booth circulation water |
| EP0823275A4 (en) * | 1996-02-27 | 1998-03-11 | ||
| US5919288A (en) * | 1996-02-27 | 1999-07-06 | Nippon Paint Co., Ltd. | Method for suppressing foams in booth circulating water |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1165567B (en) | 1987-04-22 |
| IT8050105A0 (en) | 1980-11-07 |
| FR2469198A1 (en) | 1981-05-22 |
| JPS5695318A (en) | 1981-08-01 |
| DE2945523A1 (en) | 1981-05-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |