• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Process for the treatment of cleaning solutions contaminated with paints, lacquers and similar products, as they occur in the production of the same and in printing and coating processes, wherein the contaminated solution is processed in a multi-stage process consisting of sedimentation, ultrafiltration and spray-drying in such a way that recovered solution, optionally after caching, can be used for the original purpose. In the first process step impurities are separated by sedimentation whose density is greater or less than that of the cleaning solution. In the second process step, the remaining impurities are separated by ultrafiltration. In the third process step, the liquid residue of the ultrafiltration is converted by spray drying into a solid state. The pollutants are incorporated with the help of the binder contained in the solid, at the same time an evaporation of organic solvents is kept as low as possible by a suitable choice of the process temperature. In this process a recovery rate of cleaning solutions of 95-98% and a solids content of the residue of more than 95% is achieved.
    公开号:AT518390A4
    申请号:T284/2016
    申请日:2016-06-10
    公开日:2017-10-15
    发明作者:Ing Dr Andreas Schabauer Dipl；Marc Pichler Ing；Dipl Ing Dr Peter Ramharter Msc
    申请人:Wtg Water Treat Gmbh；
    IPC主号:
    专利说明:

    description
    The invention relates to a process for the treatment of contaminated with paints, varnishes and similar products cleaning solutions, as they occur in the production of the same and in printing and Lackierprozessen, wherein the contaminated solution in a multi-stage process consisting of a sedimentation, ultrafiltration and spray drying is treated in such a way that the recovered solution can be reused for its original purpose while providing a minimum of waste requiring disposal.
    In the manufacture of paints and varnishes and in printing and varnishing processes, large quantities of cleaning solutions contaminated with pigments, fillers, hards, binders, etc. are required, which, if not reprocessed, must be disposed of, since they contain various organic and organic solvents may contain inorganic pollutants in high concentrations.
    State of the art in the treatment of such contaminated solutions are processes by adding excipients that allow the mechanical separation of impurities. A disadvantage of this method is that the recovered filtrate can not be used directly for the original purpose, but further treatment steps are required to meet the requirements of the cleaning solution.
    A process has been disclosed for the treatment of wiper liquor of Intaglio printing machines (EP 2 363 290 A1), which allows the separation of a part of the impurities by means of a centrifuge by the addition of a flocculant. After adding a filter aid, the remaining impurities are separated in a filter unit / for example a chamber filter press. The filtrate is collected and used to prepare new cleaning solution requiring re-addition of the cleaning chemicals.
    A disadvantage of this process is the high consumption of cleaning chemicals, flocculants and filter aids. The flocculants and filter aids are only needed for the recycling process and their residues in the filtrate have at best no effect on the use of the reprocessed cleaning solution in the downstream processes, in the worse case, however, a negative impact on the cleaning effect or the downstream processes and machines. In order to keep the concentrations of the interfering residues low, the complete contents of the plant must be exchanged periodically and thus the total reuse rate drops significantly.
    A similar process is described in patent EP 1 092 684 B1, in which two different flocculants and a filter aid are added successively to the used cleaning solution. The impurities are then removed in a filter from
    Filtrate separated. In contrast to the method according to EP 2 363 290 A1, however, the filtrate is not used directly for the preparation of new cleaning solution. Instead, the filtrate is distilled and only the recovered distilled water used to mix the fresh cleaning solution. Thus, the above-mentioned risks of influencing the quality of the cleaning solution and the subsequent processes are avoided. However, a disadvantage is the high energy requirement for the evaporation of the filtrate and the consumption of fresh chemicals is higher than in the method according to EP 2 363 290 Al.
    Furthermore, methods are known in which the impurities are removed by ultrafiltration with a correspondingly fine separation limit and thus all interfering constituents are separated. Here, the recovered filtrate can be used directly for the original purpose. The residue (concentrate) from the process contains very large amounts of cleaning solution, which is why typically one or more further process steps for reducing the water content in the residue and / or for increasing the recovery rate are connected downstream.
    EP 0 636 401 B1 describes that the contaminated solution is passed, after coarse filtration, into a working container which serves as a reservoir for an ultrafiltration unit. With the help of an ultrafiltration membrane whose material is not specified in the patent, the contaminated solution is separated. The permeate is returned to the reservoir for the printing process, while the retentate is returned to the working container until a predetermined operating time has elapsed. During this period of operation, the solids content of the mixture of newly added solution and retentate is always higher. Then the residue from the ultrafiltration is pumped out of the working vessel and treated in another container with bentonite-based cleavage agents and oxidizing agents to achieve a separation of solid and liquid by sedimentation. The clear phase and the sediment are passed into separate filter bags after the predetermined sedimentation time, the filtrate is returned to the ultrafiltration work tank while the residue is disposed of with the filter bags. Information on the recovery rate of the cleaning liquid and the proportion of cleaning liquid in the waste stream are not made here. In this method, as in the method according to EP 2 363 290 A1, there is the risk that residues of the cleavage and oxidizing agents enter the cleaning liquid circuit and disturb the downstream processes. In addition, fines particles that can not be retained by the filter bags are returned to the conditioning process where they accumulate and, over time, reduce the filtration performance of the ultrafiltration system. Therefore, the entire contents of the system must be replaced at short periodic intervals and thus the total recovery rate drops significantly.
    The process according to AT 503 353 B1 is likewise based on the process of ultrafiltration. Here, however, the ultrafiltration process is supplemented by a presedimentation and a storage tank for spent cleaning solution. In presedimentation, heavy components are separated from the cleaning solution, resulting in less contamination entering the ultrafiltration system. As in the method described above, the cleaning solution is then separated by ultrafiltration by means of a membrane of alumina or carbon with a filter layer of zirconia or titanium oxide from the undesirable components, the permeate is fed directly to the consumer, while the retentate back into the working container of
    Ultrafiltration system is passed. At periodic intervals, the working container is emptied into another sedimentation tank. There, the residue is mixed with the sediment of Vorsedimentation and then treated with a centrifuge to obtain a largely free of cleaning fluid residue. The disadvantage here is that the clear phase of the centrifugation still contains undesirable components of the impurities. Since the clear phase is fed to the process via the presedimentation tank according to the description, these constituents concentrate within the processing plant, as a result of which, as in the process according to EP 0 636 401 B1, the filtration performance drops over time.
    Therefore, the entire contents of the system must be exchanged in short periodic intervals and thus the total recovery rate drops significantly.
    Another disadvantage of the method according to AT 503 353 Bl is the lack of a storage container for the recovered cleaning solution, whereby fluctuating production or consumption quantities can be compensated only by throttling the production of the ultrafiltration plant. In those times when the ultrafiltration plant stands still for pumping off the residue and for cleaning the membranes, the consumer can not be supplied with cleaning solution from the reprocessing plant.
    AT 408 544 B also describes a process which uses ultrafiltration to recycle cleaning solution. Here, the spent cleaning solution is removed from a storage vessel and subjected to ultrafiltration, the filtrate is separated by means of a membrane of alumina on a zirconia or zirconia-titanium oxide membrane on a carbon support and sent to a reclaimed cleaning solution storage vessel. The residue from the ultrafiltration is further treated with the addition of defoaming chemicals by means of vacuum distillation, a solids content of 50-70 ml is achieved, which means that the waste still contains about 30- 50 m% cleaning liquid. The condensed vapor from the distillation is returned to the reclaimed cleaning solution storage tank. Alternatively, an addition to a granulation step is described in the same patent, whereby a largely anhydrous granules obtained. Details on the content of cleaning fluid of the granules are not included. A disadvantage of this method is the high energy consumption, which is due to the vacuum distillation and granulation, and the need for chemicals for vacuum distillation, from which residues can get into the cleaning liquid and affect the usability of the recovered cleaning solution.
    Compared to the known method allows the invented method, on the one hand to use the recovered cleaning liquid without further treatment or addition of chemicals for the original purpose and on the other hand to recover the liquid residue of the filtration as pasty solid with a dry matter content of more than 60%, so no further energy-intensive, thermal treatment is required. Since chemicals are not added for reprocessing in the invented process, the use of the reprocessed cleaning solution is possible without restriction (FIG. 1).
    For this purpose, the loaded with paints, varnishes, etc. cleaning liquid is passed into a sedimentation tank in which settle components with a higher density compared to the cleaning liquid at the bottom, while collecting lower density components at the surface. Both fractions can be withdrawn periodically or continuously from the container, while the middle fraction is transferred via a separator for magnetic particles in a equipped with a stirrer, Homogenisierbehälter and stored there. Since many modern colors from the field of security printing contain magnetic particles, here another, with respect to the structure of the interfering contamination layer on the membrane surface, particularly critical part of the impurities are removed and the ultrafiltration system is thus relieved. The homogenizing container mixes cleaning solutions of different levels of contamination, which means that the ultrafiltration unit is subjected to uniform loading and therefore higher recovery rates can be achieved. At the same time fluctuations in the seizure of the polluted cleaning solution can be compensated and thus the ultrafiltration system can be operated without interruption with the ideal process parameters, which also causes higher recovery rates. The cleaning solution is then fed to a cross-flow ultrafiltration unit to separate the remaining undesirable components. In the ultrafiltration plant, ceramic membranes are used around all
    Separate components with a larger (molecule) large of the cleaning fluid. Accordingly, the filtrate can immediately be used again for the original purpose, whereby a recovery rate of 95-98% can already be achieved in this step. For periodic rinsing or cleaning the ultrafiltration system freshly mixed cleaning liquid is used.
    The residue from the ultrafiltration is transferred to a collecting tank and mixed there with the light and heavy fraction from the sedimentation. The liquid from this collection container is then finely atomized in a spray dryer and dried by contact with hot air, thereby evaporating the water content of the cleaning liquid and a solid having a solids content of more than 95 m%, typically 98 m%, remains and is in a dust collector , For example, a cyclone or filter, separated from the air flow (Fig. 2). The drying takes place at temperatures between 90 and 250 ° C, preferably at 110 ° C to keep evaporation of organic solvents as low as possible. The temperature is chosen high enough so that the binder contained in the residues harden and the pollutants are incorporated in the granules. The energy for heating the drying air is provided electrically or in the form of fuel gas.
    The grain size of the granules can be influenced by the droplet size during atomization and the process parameters, so that one for another
    Use of the granules desired grain size can be adjusted.
    The exhaust air from the spray drying is passed through an activated carbon filter to retain possibly contained vapors of organic solvents. The granules from the dust collector are collected and can be filled and disposed of in containers, big bags or directly in silo trucks. Compared to the other known methods, the invented method has the lowest possible mass of waste, since the residue contains only traces of cleaning solution and also contains no flocculants, precipitants or filter aids.
    The invented process can recover up to 98% of the spent cleaning solution. At the same time, the chemical composition of the cleaning solution is not changed by flocculants or precipitants, which does not affect the quality of the cleaning solution. Since all impurities are discharged with the concentrate, and not as in the processes according to AT 503 353 Bl or EP 2 363 290 Al partially with the liquid phases of the downstream process steps are fed back into the system, no undesirable substances are enriched in the system. A periodic emptying of the complete system filling, as it is necessary in the above-mentioned methods, for example, in annual intervals, is therefore eliminated. Additional can be done through the use of
    Spray drying for the concentrate treatment Solid contents in the concentrate can be achieved, which clearly exceed those in the residues from centrifuges or vacuum evaporators, and the amount of waste to be disposed of is thus reduced to the dirt load of the cleaning solution.
    权利要求:
    Claims (8)
    [1]
    claims
    1. A process for the treatment of contaminated with paints, varnishes and similar products cleaning solutions, as they occur in the production of the same and in printing and Lackierprozessen, the contaminated solution in a multi-stage process consisting of sedimentation, ultrafiltration with ceramic membranes and spray drying is prepared so that the recovered solution, optionally after caching, can be reused for the original purpose, whereby a recovery rate of cleaning solutions of 95-98% and a solids content of the residue more than 95% is achieved.
    [2]
    2. The method according to claim 1, characterized in that in the spray drying temperatures between 90 and 250 ° C, preferably 110 ° C are used.
    [3]
    3. The method according to any one of claims 1 to 2, characterized in that the residue is separated in solid form by means of a centrifugal separator or a filtering separator from the exhaust air stream and is present as a powder or granules.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the pollutants contained are incorporated by means of the binder contained in the residues in the powder or granules.
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the grain size of the granules on the droplet size in the atomization and the process parameters can be adjusted depending on the further use.
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that evaporated solvent during drying by means of an activated carbon filter from the exhaust air stream.
    [7]
    7. The method according to any one of claims 1 to 6, characterized in that the treatment of the cleaning solution takes place without the addition of foreign chemicals.
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that no residues from downstream process steps get back into the ultrafiltration and so can accumulate within the treatment system.
    类似技术:
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    同族专利:
    公开号 | 公开日
    AT518390B1|2017-10-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0636401A1|1993-07-26|1995-02-01|Andreas Landmann|Process water recycling plant|
    EP0789000B1|1996-02-12|2006-05-17|Oesterreichische Nationalbank|Process for treating polluted alkaline aqueous cleaning solutions|
    EP1092684A2|1999-10-13|2001-04-18|Komori Corporation|Method and apparatus for the treatment of wiping solution|
    AT503353B1|2006-03-10|2016-01-15|Seiler Anlagenbau Ges M B H|METHOD FOR RECOVERING POLLUTED FLUIDS|
    EP2363290A1|2010-03-05|2011-09-07|KBA-NotaSys SA|Installation and process for recycling wiping solution of one or more intaglio printing presses|AT523844A4|2020-12-17|2021-12-15|Gwt Membraflow Gmbh|Process for processing a wiping solution loaded with foreign substances|
    法律状态:
    2022-02-15| MM01| Lapse because of not paying annual fees|Effective date: 20210610 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA284/2016A|AT518390B1|2016-06-10|2016-06-10|Multi-stage process for the treatment of contaminated cleaning solutions and for the drying of the residues|ATA284/2016A| AT518390B1|2016-06-10|2016-06-10|Multi-stage process for the treatment of contaminated cleaning solutions and for the drying of the residues|
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