Dry cleaning apparatus and method capable of utilizing a siloxane composition as a solvent

• US 6,059,845 A
• Filed: 07/14/1999
• Issued: 05/09/2000
• Est. Priority Date: 08/22/1997
• Status: Expired due to Term

• Current Assignee: GreenEarth Cleaning, L.L.C.
• Original Assignee: GreenEarth Cleaning, L.L.C.
• Inventors: Berndt, Wolf-Dieter R., Douglas, James E., Griffiss, John McLeod
• Primary Examiner(s): DIAMOND, ALAN D
• Application Number:
  US09/354,387
• Time in Patent Office: 300 Days
• Field of Search: 8/137, 8/142, 8/159, 8/141, 68/18 C, 68/20, 68/18 F, 68/18 R, 68/18 FA, 68/19.2, 68/23 R, 68/23.5, 68/24
• US Class Current: 8/142
• CPC Class Codes: C11D 1/82 Compounds containing silicon
• CPC Class Codes: C11D 3/373 containing silicones
• CPC Class Codes: C11D 3/3734 Cyclic silicones
• CPC Class Codes: D06F 43/007 Dry cleaning methods
• CPC Class Codes: D06F 43/02 having one rotary cleaning receptacle only
• CPC Class Codes: D06F 43/08 Associated apparatus for handling and recovering the solvents
• CPC Class Codes: D06F 43/081 Reclaiming or recovering the solvent from a mixture of solvent and contaminants, e.g. by distilling
• CPC Class Codes: D06F 43/085 Filtering arrangements; Filter cleaning; Filter-aid powder dispensers
• CPC Class Codes: D06F 43/086 Recovering the solvent from the drying air current
• CPC Class Codes: D06L 1/02 using organic solvents
• CPC Class Codes: D06L 1/04 combined with specific additives D06L1/06 takes precedence
• CPC Class Codes: D06L 1/08 Multi-step processes

Abstract

A system and method are provided for dry cleaning articles utilizing a siloxane solvent. The system includes a cleaning basket for receiving articles therein and a one or more tanks for containing a siloxane solvent. Coupled between the tank and the cleaning basket is a pump for immersing the articles in the cleaning basket with the siloxane solvent. Also included is a still for distilling the dirty siloxane solvent to recover the pure siloxane solvent. A condenser is coupled to the cleaning basket and/or the still for recovering condensed vapors. For decanting any water in the siloxane solvent received from the condenser, a separator is coupled to the condenser. A fan is coupled to the cleaning basket for circulating air past the condenser, then the heater coils and into the cleaning basket for drying and cooling the articles.

Claims

1. A system containing siloxane solvent and no added volatile organic cleaning solvents for dry cleaning articles comprising:

(a) a cleaning basket for receiving articles therein;

(b) one or more tanks for containing a siloxane solvent;

(c) a pump coupled between the tank and the cleaning basket for immersing the articles in the cleaning basket with the siloxane solvent;

(d) a still for distilling the siloxane solvent to recover the siloxane solvent;

(e) a condenser coupled to at least one of the cleaning basket and the still for recovering condensed vapors of the siloxane solvent;

(f) a separator coupled to the condenser for decanting any water in the siloxane solvent received from the condenser; and

(g) a fan coupled to the cleaning basket for circulating air past heater coils and into the cleaning basket for drying the articles.

2. The system recited in claim 1, wherein the still is coupled to the cleaning basket for receiving the siloxane solvent from the cleaning basket.

3. The system recited in claim 1, wherein the condenser is a still vapor condenser coupled to the still for recovering condensed vapors of the siloxane solvent from the still.

4. The system recited in claim 1, wherein the condenser is a drying vapor condenser coupled to the cleaning basket for recovering condensed vapors of the siloxane solvent from the cleaning basket.

5. The system recited in claim 4, wherein a temperature of vapor laden air from the cleaning basket is between 120 and 138 degrees Fahrenheit.

6. The system recited in claim 1, wherein the separator receives the siloxane solvent by way of gravity.

7. The system recited in claim 1, wherein the still is coupled to the tank and a vacuum generator is coupled to the still for creating a vacuum therein which extracts the siloxane solvent therefrom.

8. The system recited in claim 1, wherein the circulating air is maintained between 120 and 180 degrees Fahrenheit.

9. A method of dry cleaning articles using siloxane solvent and no added volatile organic cleaning solvents comprising the steps of:

(a) loading the articles into a cleaning basket;

(b) immersing the articles in a siloxane solvent;

(c) agitating the articles in the siloxane solvent;

(d) removing at least a portion of the siloxane solvent by centrifuging the articles;

(e) distilling the siloxane solvent to recover the siloxane solvent;

(f) recovering condensed vapors of the siloxane solvent;

(g) separating any water in the siloxane solvent;

(h) drying the articles by circulating heated air about the articles;

(i) removing the articles from the cleaning basket; and

(j) reusing the solvent.

10. The method recited in claim 9, wherein the distilled siloxane solvent is recovered through condensation.

11. The method recited in claim 9, wherein the condensed vapors of the siloxane solvent are recovered from the still.

12. The method recited in claim 9, wherein the condensed vapors of the siloxane solvent are recovered from the cleaning basket.

13. The method recited in claim 12, wherein a temperature of condensed vapor laden air from the cleaning basket is between 120 and 138 degrees Fahrenheit.

14. The method recited in claim 9, and further comprising the step of using a vacuum generator to extract the siloxane solvent from a still used to distill the siloxane solvent.

15. The method recited in claim 9, wherein the circulating heated air is maintained between 120 and 180 degrees Fahrenheit.

16. The method recited in claim 9, and further comprising the step of filtering the siloxane solvent prior to immersing the articles.

17. The method recited in claim 9, and further comprising the step of filtering the siloxane solvent prior to recovery of the siloxane solvent.

18. The method recited in claim 9, and further comprising the step of maintaining a temperature of the siloxane solvent used during agitation between 90 and 130 degrees Fahrenheit.

19. The method recited in claim 9, wherein a coalescing media comprised of open cellular foam as prepared from urea-formaldehyde resin is utilized to enhance the dry cleaning process.