Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1997-09-09
1999-03-16
Fortuna, Ana
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
21050023, 2103218, 21032187, 118610, B01D 6100
Patent
active
058825223
DESCRIPTION:
BRIEF SUMMARY
DETAILED DESCRIPTION OF THE INVENTION
1. Technical Field
The present invention relates to a method for recovering the paints suitable to an object that, in a booth for a spray coating used for coating a material, the oversprayed paints can be easily recovered and recycled as they are or after a simple adjustment as reusable paints and it also relates to a receiver used for said recovery.
2. Background Art
With an object of prevention of environmental pollution and others, a method for recovering oversprayed paints during a course of coating a material has been conducted already. Said method is roughly classified into a dry method and a wet one. The dry method is a method where oversprayed paints are received by fencing boards or by a filter made of glass wool, nonwoven fabric, paper, etc. while the wet method is a method where the oversprayed paints are received by a liquid mist such as water and oil, a curtain-like liquid flow, a tank for recovered liquid, etc.
However, in a dry method, it is difficult to easily peel off and remove the oversprayed paints which are received by the fencing boards or by a filter made of glass wool, nonwoven fabric, paper, etc. Therefore, it is common that, after being used for a certain period, both filter and oversprayed paint are not recycled but are discarded whereby an increase in running cost for exchanging the filter and an environmental problem due to production of industrial wastes are resulted. In a wet method, it is common that the oversprayed paints which are received by a liquid mist such as water and oil, a curtain-like liquid flow, a tank for recovered liquid, etc. are subjected to a solid-liquid separation using an agent called a deblocking agent and the oversprayed paints solidified as such are discarded whereby there is an environmental problem due to a production of industrial wastes. In a wet method, another means is conducted too where the recovered liquid in which the oversprayed paints are received is concentrated and the paints are regenerated and recycled. In said means, however, an apparatus for treating the recovered liquid by which concentration, adjustment of the paints, etc. is necessary and, therefore, recovery and recycling of the oversprayed paints are not easy. Under such present circumstances, there has been a demand for a method for recovering the paints that, in a booth for a spray coating used for coating a material, the oversprayed paints can be easily recovered and recycled as they are or after a simple adjustment as reusable paints and also for a receiver used for said recovery.
The present invention has been achieved for solving the problems mentioned hereinabove and an object of the present invention is to offer a method for recovering the paints suitable to an object that, in a booth for a spray coating used for coating a material, the oversprayed paints can be easily recovered and recycled as they are or after a simple adjustment as reusable paints and also to offer a receiver used for said recovery.
DISCLOSURE OF THE INVENTION
The present inventors have conducted an intensive study on a method of recovering the paints for solving the above problems and have found that, when a receiver using a ultrafiltration membrane (UF membrane) or a microfiltration membrane (MF membrane) is placed before a filter or a wet dust collector for receiving the oversprayed paints or is placed instead of such a filter or a wet dust collector and then water is passed through the UF membrane or the MF membrane in case the paints are aqueous type or, in case the paints are organic solvent type, an organic solvent is passed therethrough, then the oversprayed paints adhered onto the receiver flow down to a gravitational direction and, as a result, the oversprayed paints which are capable of being reused as they are or after a simple adjustment can be recovered under the receiver. When the surface of the receiver is made of an UF or MF membrane and then water or organic solvent is passed through the UF or MF membrane, surface of the receiver becomes in a
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Hirota Tetsuya
Ito Koryo
Maruoka Hiroaki
Matsumoto Koichi
Asahi Kasei Kogyo Kabushiki Kaisha
Fortuna Ana
Shinto Paint Co. Ltd.
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