Gas separation: apparatus – Solid sorbent apparatus – Plural solid sorbent beds
Patent
1993-05-25
1994-03-01
Hart, Charles
Gas separation: apparatus
Solid sorbent apparatus
Plural solid sorbent beds
96131, 96134, 55269, 55484, 55485, B01D 5304
Patent
active
052903443
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filter used refreshing or cleaning apparatus for a dry cleaning machine.
DESCRIPTION OF THE PRIOR ART
Resulting of development of various materials for improving cleaning effect in the cleaning machines, the presently-used machines mainly employ, in place of organic petroleum solvents having a relatively high ignition point, inflammable synthetic solvents such as perchloro ethylene and the like and bulklene (phonetic) of fluorine solvent.
When such dry cleaning processes using these solvents above are employed, these solvents are expensive comparing to water used in water washing process, so dirty solvent after once used in the dry cleaning process has been used several times after being treated as shown below. The dirty solvent used passes once at a time through a filter device installed in the dry cleaning machine in order to remove insoluble dust and rubbish and then filtered and cleaned solvent returns to the machine.
When the level of soluble dirt collected or deposited in the solvent rises over a certain limit, the dirty solvent is boiled and oil and fat contained therein is removed through an centrifugal machine.
The maximum number of repeating or clarifying solvent to be used in the washing machine or dry cleaning machine having such filter device and centrifugal machine above is ordinarily 700 to 800 times when a volume or weight to be cleaned in a washing machine at a time is about 30 kg. If goods of more heavy is dry cleaned in the machine, the filter for removing insoluble dust and rubbish clogs up and the goods to be clarified fails to be cleaned or cleaning effect of the dry cleaning machine considerably decreases. Then, the clogged filter must be changed.
According to the filter of one kind, it is constructed by a core pipe, an absorbent material such as activated carbon installed in a circumferential space of the core pipe, and a water pervious sheet such as washi (Japanese paper) and non-woven cloth covering an outer peripheral surface of the absorbent material. Ordinarily, the cylindrical conventional filter above is of a cartridge type and enables to enter in and remove from the dry cleaning machine.
So called waste or useless filter clogged and necessitated to be changed with new one contains insoluble dust and rubbish of more than permittable level, which are removed from the goods cleaned by the dry cleaning machine, as well as solvent is soaked and remained in the waste filter.
Comparing to a new filter of a type used for goods of 30 kg per one usage having a weight of 15 kg, a waste filter used has a so high weight as about 45 kg. It is apparent that the weight of insoluble dust and rubbish and solvent contained in the waste filter is about 30 kg.
Examining the contents of the remainings of 30 kg in the case above, it has been found that about 5 kg is insoluble dust and rubbish and the rest of about 25 kg is solvent. It is not economical to discard much solvent contained in the waste filter, and more importantly it is prohibited to discard or dispose selfishly perchloro ethylene and bulklene of solvent. Perchloro ethylene and bulklene are designated as harmful and hazardous materials and consequently they must be conveyed and destroyed by fire and disposed through specialists or authorized persons.
Unfortunately, there is no specialists or authorized persons treating such special and hazardous materials in particular districts. For example, concerning Yamagata-ken of a district, Japan there is no specialists or authorized persons, and so it is necessary to take the trouble to ask specialists in Niigata-ken or Niigata prefecture neighboring Yamagala prefecture, discarding the hazardous materials. It is not only inconvenient and but also not economical because recovery cost of the materials is 180 per kg (in the case above, 45 kg.times. 180 8100 per a waste filter). Consequently, with reference to the large cleaning shop using many filters, the cost of the filters is made huge, as well as treating or handling them
REFERENCES:
patent: 3309844 (1967-03-01), Hemstreet et al.
patent: 4559138 (1985-12-01), Hayms
patent: 4759845 (1988-07-01), Selesnick
Hart Charles
Onodera Doraikuriiningu Kojo Co., Ltd.
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