Method and apparatus for the recovering of solvents in dry cleaning units
AssigneeAMEG Verfahrens-und Umweltschutz-Technik AG
InventorsMartin R. Zimmermann, Walter Oettli
Life of this patent
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Abstract
In a process for recovering solvents from the circulating air and exhaust air of a drycleaning machine by drying the circulating air and by fresh air drying with condensation and adsorption, the volume of air stream per unit volume is controlled in accordance with temperature and/or solvent concentration and heating and cooling energy reduced to achieve drying and recovery of the cleaning solvent with relatively low expenditure of energy and time.
Claims17
In a method for recovery of solvents from the circulating air and exhaust air of a dry cleaning machine (CRM) by drying of circulating air and by fresh air drying by help of condensation and adsorption, the improvement of changing the air volume dependent on the condition values for condensation and adsorption of the solvents including establishing an initial air volume at the beginning of a circulating dry interval and diminishing the air volume during said circulating dry interval to about 1/10 of the initial volume and thereafter establishing a fresh air drying interval in which the air volume is established at substantially said initial volume.
In a cleaning machine for recovering of solvents from the circulating air and exhaust air of a dry cleaning machine (CRM) by drying of circulating air and by fresh air drying by help of condensation and adsorption having a treating chamber for treating solvent laden articles, air circulating means for passing air into contact with such articles to vaporize the solvent, means for withdrawing the solvent-laden air and passing such to a condensing means, control means for varying the volume of circulating air, the apparatus improvement comprising a device for change of air volume,
- wherein said control means includes means for changing the volume of circulating air dependent on the condition values for condensation and adsorption of the solvents and including means for establishing an initial air volume at the beginning of a circulating dry interval of said air circulating means and diminishing the air volume during said circulating dry interval to about 1/10 of the initial volume and thereafter establishing a fresh air drying interval in which the air volume is established at substantially said initial volume,
- said cleaning machine including an exhaust line,
- said control means comprising separate means for change of air volume within the cleaning machine and said exhaust line of the cleaning machine.
Dependencies are inferred from the claim text.