Multifunctioning method utilizing a two phase non-aqueous extraction process

• US 7,300,468 B2
• Filed: 05/23/2005
• Issued: 11/27/2007
• Est. Priority Date: 10/31/2003
• Status: Expired due to Fees

• Current Assignee: Whirlpool Corporation
• Original Assignee: Whirlpool Patents Company (Whirlpool Corporation)
• Inventors: Luckman, Joel A., Wright, Tremitchell L.
• Primary Examiner(s): Douyon; Lorna M.
• Assistant Examiner(s): NGUYEN, TRI V
• Application Number:
  US11/135,181
• Publication Number:
  US 20050257812A1
• Time in Patent Office: 918 Days
• Field of Search: 813/7, 814/2, 510/280, 510/281, 510/285, 510/286, 510/291, 510/407
• US Class Current: 8/142
• CPC Class Codes: D06F 35/006 for washing or rinsing only
• CPC Class Codes: D06F 43/00 Dry-cleaning apparatus or methods using volatile solvents D06F9/00 - D06F41/00 take precedence
• CPC Class Codes: D06F 43/007 Dry cleaning methods
• CPC Class Codes: D06F 43/08 Associated apparatus for handling and recovering the solvents
• CPC Class Codes: D06F 43/085 Filtering arrangements; Filter cleaning; Filter-aid powder dispensers
• CPC Class Codes: D06L 1/22 Processes involving successive treatments with aqueous and organic agents

Abstract

A method of laundering a fabric load is disclosed including the steps of processing a fabric load in an aqueous-based working fluid, substantially replacing the aqueous-based working fluid with a non-aqueous working fluid of the type which extracts some of the aqueous-based working fluid from the fabric load.

Claims

1. A method of laundering a fabric load comprising the steps of:

contacting the fabric load with an aqueous working fluid in a wash chamber of a washing machine wherein the aqueous working fluid consists of water and a washing additive selected from the group consisting of;

builders, surfactants, enzymes, bleach activators, bleach catalysts, bleach boosters, bleaches, alkalinity sources, antibacterial agents, colorants and mixtures thereof;

processing the fabric load with said aqueous working fluid;

substantially removing the aqueous working fluid from the wash chamber and contacting the fabric load with a first non-aqueous working fluid of the type which extracts some of the aqueous working fluid from the fabric load;

substantially removing the first non-aqueous working fluid from the wash chamber and contacting the fabric load with a second non-aqueous working fluid;

drying the fabric load following the step of substantially removing the first non-aqueous working fluid from the wash chamber and contacting the fabric load with a second non-aqueous working fluid;

wherein the first non-aqueous working fluid is selected from the group;

terpenes, halohydrocarbons, glycol ethers, polyols, ethers, esters of glycol ethers, esters of fatty acids, long chain carboxylic acids, long chain alcohols, short-chain alcohols, siloxanes, dibasic esters, aliphatic hydrocarbons, i-propyl myristate, soy methyl esters, ethyl hexyl lactate, and mixtures thereof; and

wherein the second non-aqueous working fluid is selected from the group;

methoxynonafluorobutane, ethoxynonafluorobutane, propoxynonafluorobutane, and mixtures thereof.

2. The method of claim 1 wherein said processing step comprises adding mechanical energy to provide relative movement between said working fluid and said fabric load whereby the mechanical energy is selected from the following but not limited to:

tumbling, agitating, impelling, nutating, counter-rotating the drum, liquid jets that spray fluids thus moving the fabric, vibrating, oscillating, and combinations thereof.

3. The method claim 1 wherein one of the first non-aqueous working fluid and the second non-aqueous working fluid is selected for having at least one of the following sets of Hansen Solubility Parameters:

a. A polarity greater than 3 and hydrogen bonding less than 9;

b. Hydrogen bonding less than 13 and dispersion from about 14 to about 17; and

c. Hydrogen bonding from 13 to about 19 and dispersion from 14 to 22.

4. The method of claim 1 wherein the first non-aqueous working fluid is contacted with the fabric load for a time sufficient to decrease the concentration of aqueous working fluid in contact with the fabric load to less than 50% by weight of the fabric load.

5. The method of claim 4 further comprising routing the non-aqueous working fluid to a recovery process.

6. The method of claim 4 further comprising removing a substantial portion of said non-aqueous working fluid by centrifugation at a force exceeding 2G.

7. The method of claim 1 wherein drying the fabric load comprises contacting the fabric load with a drying gas.

8. The method of claim 1 wherein the first non-aqueous working fluid is characterized by having at least one of the following properties:

a. Having a flash point greater than 140°

F.; and

b. Having a surface tension lower than that of the aqueous working fluid.

9. The method of claim 1 wherein said first non-aqueous working fluid contacts the fabric load for a time sufficient to decrease the concentration of aqueous wash liquor to less than 50% by weight of the fabric.

10. The method of claim 1 wherein the fabric load and working fluid are contained within a wash container having a wall and wherein said first non-aqueous wash liquor contacts the fabric load while the wash container is spinning at a force sufficient to move the fabric load toward the wall of the wash container.

11. The method of claim 1 wherein said second non-aqueous working fluid has at least one of the following characteristics:

a. A surface tension lower than that of the aqueous working fluid and first non-aqueous working fluid;

b. A Kauri-Butanol value less than that of the first non-aqueous working fluid; and

c. Being non-flammable.

12. The method of claim 11 wherein said second non-aqueous working fluid is further characterized by at least one of the following set of Hansen Solubility Parameters:

a. A polarity greater than about 3 and hydrogen bonding less than 9;

b. Hydrogen bonding less than 13 and dispersion from about 14 to 17; and

c. Hydrogen bonding from about 13 to about 19 and dispersion from about 14 to 22.

13. The method of claim 1 wherein drying the fabric load involves contacting the fabric load with a drying gas for a time sufficient to lower the concentration of said second non-aqueous working fluid, said first non-aqueous working fluid and aqueous working fluid to less than 5%.

14. The method of claim 1 wherein the second non-aqueous working fluid has a vapor pressure greater than 5 mm Hg at standard conditions.

15. The method of claim 1 wherein the temperatures for drying the fabric load is less than 100°

C.

16. The method of claim 1 wherein the step of drying said fabric load comprises:

a. Flowing drying gas into said fabric load;

b. Sensing a non-aqueous working fluid concentration in at least one of the fabric load and a headspace above said fabric load;

c. Sensing an aqueous working fluid concentration in at least one of the fabric load and a the headspace above said fabric load, and

d. adding an aqueous fluid until an acceptable head is achieved.

17. The method as defined in claim 16 wherein said step of sensing non-aqueous working fluid concentration involves at least one of the following techniques:

pressure, turbidity, conductivity, infrared, ultrasonic, shaped electromagnetic fields (SEF), float sensing, laser deflection, petrotape/chemtape, electric field imaging, capacitive, humidity, non-dispersive infrared, solid state, acoustic wave, metal oxide semiconductors, pH, ionic strength, oxidation reduction potential, refractive index, or combinations thereof.

18. The method as defined in claim 16 wherein said step of sensing aqueous working fluid concentration involves at least one of the following techniques:

conductivity, humidity strips, thermisters, infrared, pressure, refractive index, or mixtures thereof.

19. The method of claim 16 wherein said step of adding aqueous working fluid comprises utilizing a spraying nozzle, misting nozzle, or exposing the system to the environment.