US3679590A - Solvent bleaching - Google Patents

Solvent bleaching Download PDF

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US3679590A
US3679590A US857214A US3679590DA US3679590A US 3679590 A US3679590 A US 3679590A US 857214 A US857214 A US 857214A US 3679590D A US3679590D A US 3679590DA US 3679590 A US3679590 A US 3679590A
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fabric
percent
hydrogen peroxide
water
solvent
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Charles L Cormany
John A Spotts Jr
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PPG Industries Inc
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PPG Industries Inc
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/20—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen
    • D06L4/28—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen in an inert solvent
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/39—Organic or inorganic per-compounds
    • C11D3/3947—Liquid compositions
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/395—Bleaching agents
    • C11D3/3956—Liquid compositions
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
    • D06L4/17—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen in an inert solvent
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/20—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen
    • D06L4/22—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents
    • D06L4/23—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents using hypohalogenites

Definitions

  • This invention provides for eltectively coping with both oleophilic and hydrophilic soils simultaneously and thus provides for a unitary cleansing treatment. It further provides an overall process for laundering fabrics of cotton-polyester blends and on the permanent press type which is economical and capable of being practiced in equipment appropriate for use in the commercial laundry.
  • a laundering or cleaning bath which is capable of treating fabrics soiled with both oleophilic and hydrophilic stains or soils by single contact therewith.
  • a cleaning bath which has as primary cleansing components both an organic, substantially water immiscible cleaning solvent and an aqueous phase containing a water soluble bleach.
  • Laundering baths herein contemplated thus contain as a principal component methylchloroform, perchloroethylene, or like halogenated organic cleaning solvent along with an aqueous solution "ice of a water soluble bleaching agent such as aqueous hydrogen peroxide or a water soluble hypochlorite such as sodium hypochlorite.
  • These bleaching agents are substantially insoluble in the organic cleaning solvent of the bath.
  • the aqueous phase is dispersed throughout the organic cleaning solution phase of the bath. Distribution of the aqueous phase as a discontinuous phase through the continuous phase of organic cleaning solvent component of the bath not only insures there be proper contact between the goods and aqueous bleaching component, but prevents spot bleaching and non-uniform stain removal.
  • a portion of the water comprisnig the dispersed aqueous phase can be provided by water brought into the bath along with the materials undergoing the treatment.
  • a pretreating step to control the fabrics water content prior to contact with the cleansing bath of organic cleaning solvent there is a degree of uncertainty. For this reason, recommended practices insure the presence of at least the minimum effective water content dispersed in the organic cleaning solvent of the treating bath whether or not water is introduced along with the materials subjected to the cleansing treatment.
  • the water content of the bath constitutes but a minor portion of the total treating bath.
  • This small water phase is distributed in the bath so that it contacts uniformly the material being cleansed.
  • Small droplets of aqueous bleaching agent are thus dis persed in the continuous organic phase of the bath.
  • Distribution of aqueous hydrogen peroxide throughout a substantially water immiscible cleaning solvent such as methylchloroform is accomplished, according to one embodiment, by use of suspending agent such as a long chain alkyl sodium phosphate.
  • Suspending agents or surfactants facilitate dispersion of the aqueous hydrogen peroxide phase as small droplets uniformly throughout the methylchloroform even though the aqueous phase constitutes but a minor weight portion, for example, from 0.5 to 3 weight percent, of the methylchloroform.
  • the bath performs bleaching as if it was solely constituted of aqueous hydrogen peroxide, yet those fabrics treated with special advantage by the present invention (i.e., those with oleophilic and hydrophilic properties) are not degraded.
  • polyester-containing fabric and permanent press treated fabrics may be cleansed of both oleophilic and hydrophilic soils without significant fiber degradation.
  • a further advantage of dispersing a relatively small aqueous bleaching phase in an organic water immisible cleaning solvent is that the total amount of hydrogen peroxide or like aqueous bleaching agent required to effect the desirable level of strain removal and brightening is well below that which would be necessary in a treating bath without the organic treating solvent.
  • the organic solvent acts as a distributing agent. Although diluting the bleaching agents concentration in the bath, it does not reduce its bleaching action to a level comparable to single phase aqueous bleach bath with the same total amount of bleach agent.
  • EXAMPLE 1 A solution was prepared by passing 3600 milliliters of methylchloroform containing 29.9 grams (0.5 weight percent of methylchloroform) of Alkapent 6TD (a long chain alkyl dihydrogen phosphate sold by the Weyland Chemical Division of Philip A. Hunt Chemical Corporation) and 47.8 milliliters (1.0 percent by weight of the methylchloroform) of distilled water through 50 cubic centimeters of sodium carbonate disposed in a glass column one inch in diameter. The treatment with soda ash converted the Alkapent 6TD (a long chain alkyl dihydrogen phosphate) to long chain alkyl sodium phosphates.
  • Alkapent 6TD a long chain alkyl dihydrogen phosphate
  • EXAMPLE 3 A stock solution was prepared by passing three liters of methylchloroform containing 20 grams of Alkapent 6TD (0.5 percent by Weight of the methylchloroform) and 40 milliliters of distilled water through a bed of sodium carbonate. The sodium carbonate treatment converted the Alkapent 6TD (long chain alkyl dihydrogen phosphate) to a long chain alkyl sodium and disodium phosphate. Ten grams scoured cotton panels were then placed for the specified period of time in milliliter portions of the bleach liquor to which the amounts of 70 percent hydrogen peroxide specified in Table 3 had been added and then removed, water Washed, air dried and ironed. The reflectance and fluidity of many of these samples were determined and are reported in Table 3. Without the treatment, the cotton had a blue reflectance of 64.7 percent and a Cuam fluidity of 2.2 rhes.
  • Example 4 The procedure of Example 3 was repeated with three different levels of hydrogen peroxide.
  • the cotton without bleaching had a Blue Reflectance of 65.7 percent and a Cuam fluidity of 2.2 rhes.
  • TAB LE 4 Concentration of Blue 70% H202 reflec- Guam (W G) tance, fluidity percent percent (rhes) Time (minutes):
  • EXAMPLE 5 A stock solution of bleach bath compositions for the first four runs reported in Table 5 was prepared by adding 0.17 gram of sodium carbonate in water ot 150 milliliters of methylchloroform composition which contained 0.5 weight percent of Alkapent 6TD, the amount of water used to dissolve the sodium carbonate being 0.5, 1.0, 1.5 and 2.0 milliliters respectively. The remaining three runs used a stock solution provided by adding 1.8 grams of sodium carbonate dissolved in 5 milliliters of water to 750 milliliters of methylchloroforrn containing 0.5 weight percent Alkapent 6TD. Additionally, 1.0 milliliter and 2.0 milliliters of water were added respectively to the last two samples.
  • I OWG By weight of the cotton goods.
  • 8 0WS By weight of the methylchloroform.
  • the cleansing solution includes a suspending agent which serves to facilitate and maintain the aqueous bleaching phase in the desirable dispersed state.
  • these agents facilitate the bleaching action of the agent.
  • Many are also detergents (as well as suspending agents) and hence their presence adds this to the cleansing capacity of the treating solution. Most are either anionic or nonionic.
  • any one of many suspending agents work as evidenced by the examples.
  • these may be mentioned: octyl phenoxy polyethoxy ethanol (nonionic), polyethylene glycol ester of oleic acid (nonionic), nonyl phenyl polyethylene glycol ether (nonionic), nonyl phenoxy poly (ethyleneoxy) ethanol (nonionic) polyoxyethylene polyol fatty acid esters (nonionic), sodium dodecyl diphenyl ether disulfonate (anionic), octyl phenoxy polyethoxy ethanol (nonionic), alkylaryl polyether alcohol (nonionic), octyl phenoxy ethanol (nonionic) and octyl phenoxy diethoxy ethanol (nonionic).
  • EXAMPLE 6 Ten gram scoured cotton panels were treated for 10 minutes at room temperature in a cleansing bath provided by passing 150 milliliters of methylchloroform containing one gram of Alkapent 6TD and two grams of distilled water through a sodium carbonate column to which was added 2.34 milliliters of 70 percent hydrogen peroxide. Thereafter, the panels were rinsed as described in Table 6 and the Blue Reflectance and fluidity of the panels measured:
  • Residual hydrogen peroxide or like bleaching agent is reduced to a tolerably low level (i.e., to a level at which serious fiber degradation is avoided) in the treated fabric by rinsing the fabric with a special formulation containing as basic constituents an organic cleaning solvent, ideally the same organic solvent employed in the cleaning step, along with a minor concentration of a substantially water soluble alcohol.
  • a special formulation containing as basic constituents an organic cleaning solvent, ideally the same organic solvent employed in the cleaning step, along with a minor concentration of a substantially water soluble alcohol.
  • Such alcohols include monohydric aliphatic alcohols such as ethanol, isopropanol, n-propanol, t-butanol, isobutanol, the amyl alcohols such as t-amyl alcohol, and the like, notably, alkanols containing from 2 to 5 carbon atoms.
  • Useful alcohol concentrations in the rinse compositions are from 1 to 10 percent or even 15 percent by volume of the organic cleansing solvent.
  • monohydric alcohols should have a substantial miscibility in both the organic cleaning solvent and in water, so that in the concentrations it is present it will not form (or cause to form) a. second distinct liquid phase. It is desirable that the rinse composition before and after use be as a single liquid phase. Alcohols with a relatively low boiling point (below about C.) are advantageous; they are readily removed from the fabric by those drying procedures normally utilized in connection with the cleaning of fabrics in commercial laundry operations.
  • a monoether of a dihydric compound notably, lower alkyl monoethers of glycols such as methyl Cellosolve, ethyl ether or glycol, and like water soluble, organic soluble monoether can be included in the rinse formulation. This permits a reduction in the alkanol without hampering the compositions performance.
  • Rinse compositions will also contain a small amount of water. For one thing, residual water from the treated fabric will find its way into the rinse. As hereinafter discussed, use as by recycle is contemplated of rinse solution which has previously been in contact with treated fabric. Water contents range from about 0.1 to weight percent, of the organic solvent, or sometimes even higher (e.g., up to about percent). It is preferred practice for the Water content to be below that which will give rise to a separate (immiscible aqueous) phase; ergo, the water is present as dissolved water. A separate liquid phase of any kind presents complications in the adaption of more common dry cleaning equipment to this method and hence is better avoided.
  • reagents which reduce hydrogen peroxide are thus of use.
  • Some such reagents include inorganic reducing agents such as ferrous ammonium sulfate, sodium sulfite, sodium bisulfite, potassium sulfite, potassium bisulfite, ammonium sulfate, ammonium bisulfite and organic reducing agents exemplified by thioureas such as allyl thiourea diethylthiourea and dibutylthiourea; aldehydes such as formaldehyde, pyruvaldehyde and glycidaldehyde.
  • EXAMPLE 7 Cotton fabric was treated for 10 minutes at room temperature in a bath of methylchloroform containing 0.5 percent Triton GR7 (a Rhome & Haas product; dioctyl sodium sulfosuccinate) anionic suspending agent and by weight of the fabric, 30 percent water, 4.5 percent ammonium hydroxide and 10 percent of 70 percent hydrogen peroxide. After being Withdrawn from the bleaching bath, the fabric was contacted for 9 minutes with sixty weight parts per part of fabric of a liquid composition of methylchloroform containing 0.5 weight percent of Triton GR7 the solvent and (by weight of the fabric) 20' percent water, and 7 percent sodium sulfite. Three one-minute methylchloroform rinses followed. Residual hydrogen peroxide in the fabric was 0.19 percent.
  • Triton GR7 a Rhome & Haas product; dioctyl sodium sulfosuccinate
  • EXAMPLE 8 In each of the tests, a ten gram neutral scoured cotton panel was bleached for 10 minutes at room temperature in 150 milliliters of methylchloroform composition to which 0.5 gram of Al'kapent 6TD, 0J5 milliliter of distilled water, 0.085 gram of sodium carbonate and 0.5 milliliter of 70 percent hydrogen peroxide had been added. The panels were then removed, hand squeezed, dried and rinsed with the compositions and in the manner described in Table 7 :Following the rinsing, a 5 gram portion of the cotton panel was tested to determine its residual hydrogen peroxide content.
  • each rinse was for two minutes, the volume of rinse material was 250 milliliters and six rinses were employed.
  • EXAMPLE 9 A ten gram neutral cotton panel was treated for 10 minutes at room temperature with 150 milliliter portions of a stock solution prepared by adding 1.7 grams of sodium carbonate, 10 grams of Alkapent 6TD and 10 milliliters of distilled water to 3,000 milliliters of perchloroethylene and to which portion 0.5 milliliter of 70 percent hydrogen peroxide was added. After removal from the treating bath, the panel was rinsed six times using each time 250 milliliters of a perchloroethylene rinse com position containing 10 percent by volume 2-propanol and 1 milliliter of distilled water. Following this rinsing, the panel was dried in a forced air oven at about 70 C. until all solvent vapors had been expelled, then ironed. Its residual hydrogen peroxide content was 0.09 percent and it had a Cuam fluidity of 3.8 rhes.
  • Organic cleaning solvents other than methylchloroform as exemplified by the use of perchloroethylene in Example 9, are effective. Usually these cleaning solvents are essentially water immiscible. The more notable are halogenated hydrocarbon solvents, having 1 to 3 carbons.
  • methylchloroform these include chloroform, carbon tetrachloride, methylene chloride, methylene dichloride, ethylene dichloride, trichloroethylene, perchloroethylene, many of their fluorinated or chlorofluorocounterparts such as 1,1,2-trifluoro 1,2,2-trichloroethane, difluoromethane, tritluoroethylene, chloro-fiuoro hydrocarbon cleaning solvents, such as trichlorofluoromethane, 1,1,2,2-tetrafiuoro 1,2-dichloroethane, as well as other halogenated solvents containing two or more different halogens.
  • Other solvents include petroleum dry cleaning solvents such as the Stoddards Solvents.
  • Example 11 illustrates applicability of halogen bearing organic cleaning solvents.
  • EXAMPLE 11 The general procedure involved treating with a cleansing bath provided by mixing about 0.5 millimeter of 70 percent hydrogen peroxide into 150 milliliters of a solution provided by adding 0.55 gram of Alkapent 6TD and 0.5 millimeter of 3.2 Normal sodium carbonate to the organic solvent. A ten gram sample of 100 percent scoured cotton was placed in the bath at room temperature and agitated for minutes. The bath composition and liquorto-goods ratio in the treatment was such that the hydrogen peroxide content of the bath was 6.4 percent, the sodium carbonate was 0.85 percent, the water constituted 5 percent (all by weight of the organic cleaning solvent) and the Alkapent 6TD content was 0.25 percent by weight of the goods.
  • the fabric from each cleansing step was then treated for 5 minutes at 25 C. in a bath of the solvent employed in the cleansing step containing sodium sulfite (Na SO a small amount of water and about 1 gram of Triton GR-7 (an anionic neutral detergent).
  • sodium sulfite Na SO a small amount of water and about 1 gram of Triton GR-7 (an anionic neutral detergent).
  • Triton GR-7 an anionic neutral detergent
  • the fabric was then placed in the bath of the solvent containing a small amount of dilute hydrochloric acid and about 1 gram of Triton GR-7 for the purpose of destroying any salts generated by the sulfite. Then it was rinsed with solvent only to remove any residual Triton (BR-7 following which the sample was air dried for three minutes and then ironed. Samples ironed to dryness had their reflectance values determined.
  • hydrogen peroxide as the bleaching component of the cleansing or organic solvent bleaching system
  • other water soluble bleaches may be employed, especially those water'soluble bleaches which are substantially insoluble in the organic cleaning solvent of the cleaning bath.
  • alkali metal peroxides such as sodium peroxide, hypochlorous acid and the alkali hypochlorites such as sodium hypochlorite, potassium hypochlorite and lithium hypochlorite as well as mixtures of one or more (including hydrogen peroxide) are effective.
  • Typical practice of the invention herein described utilizing equipment of the type available to and in the commercial laundry involves charging a dry cleaning wheel with soiled garment following which the cleansing composition (of the invention) is then introduced into the wheel.
  • the fabric is agitated in the cleaning solvent usually for from 5 to 25 minutes whereupon the solvent is drained promptly from the wheel and the garments therein extracted (spin dried), a typical time period for this being from 2 to 5 minutes.
  • the garments are freed of extraneous cleansing solvent, they are rinsed with a solution comprised of the organic cleaning solvent (utilized in the cleaning step), a minor amount of monohydric alcohol such as isopropyl alcohol alone or in combination with methyl-Cellosolve and a small amount of water. Effective results are obtained when the rinse solution is continuously circulated through and out of the dry cleaning wheel.
  • the monohydric constituents should be present in a quantity suflicient to dissolve the hydrogen peroxide from the fabric and also avoid the formation of separate immiscible phase in the circulating rinse solution. It especially is important to maintain the rinse solutions as a single liquid phase when the circulating solution is passed through filters (for purification) designed to handle but a single liquid phase, a typical characteristic of filter systems in many dry cleaning apparatus.
  • Residual hydrogen peroxide in the garments is reduced with particular effectiveness by continuously removing rinse solution from the wheel, destroying or reducing the peroxide content of the solution, and returning it to the wheel.
  • Contacting the rinse composition with materials which selectively decompose hydrogen peroxide will accomplish this.
  • polyvalent metals are of use in this connection. Palladium deposited on a particulate clay substrate, for example, provides an excellent bed through which to pass the rinse solution for the purpose of destroying hydrogen peroxide.
  • Other metals useful in lieu of palladium include silver, platinum, ruthenium, manganese and the like. In general, those polyvalent metals which do not form oxides soluble in the rinse solution are preferred since soluble oxides dissolve and accumulate, and ultimately will have to be removed from the system.
  • Ferromanganese alloys, silver oxide, activated carbon, cobalt chloride impregnated on calcium sulfate are among many other useful materials.
  • any residual rinse solvent is drained from the fabrics usually in less than 5 or 10 minutes.
  • the garments are then dried by a typical procedure employed in dry cleaning, notably by contact with hot air for several minutes. Solvent vapors in the hot air are usually removed by conl l densation from the hot air exiting the dry cleaning wheel. Other steps used in dry cleaning may be performed such as deodorizing.
  • EXAMPLE 12 Use of a commercial type short cycle dry cleaning unit with some adaptation in materials of construction (e.g., use of polyethylene tubing in lieu of rubber hosing) and provision of two tanks for handling two different liquid compositions demonstrated the applicability of the system to commercal equipment as follows.
  • Cleansing solution was provided by adding 0.38 pound of Alkapent 6TD, 29.4 grams sodium carbonate monohydrate in 199 milliliters of distilled water and 260 milliliters of 35 percent hydrogen peroxide to 14 gallons of methylchloroform. Eight gallons of this solution was fed to the dry cleaning wheel which contained five pounds of fabric (of the type identified in the table). Then 260 milliliters of 35 percent hydrogen peroxide was added, whereafter the fabric and solvent were agitated in the wheel for 20 minutes at room temperature and the liquid drained from the wheel in three minutes.
  • Rinsing was then commenced by circulating several gallons per minute of a methylchloroform solution containing 5 volume percent (2.15 gallons) isopropanol, 2 volume percent (1.02 gallons) methylcellosolve and 0.25 volume percent (0.122 gallon) water for 25 minutes at room temperature through the dry cleaning wheel.
  • the rinse composition withdrawn from the wheel was passed through a cartridge of finely divided clay impregnated with two weight percent palladium. This catalyzed decomposition of hydrogen peroxide so that rinse solvent returned to the wheel was depleted of hydrogen peroxide. As a result, the residual hydrogen peroxide in the fabric was substantially removed.
  • cleaning solvent extracted from the dry cleaning wheel and the cleaning step of the process is collected in an appropriate storage container. So too,.the
  • the solution Prior to further use with a fresh change of soiled garments, the solution is replenished with the additional aqueous bleaching material such as hydrogen peroxide.
  • the goods are initially treated with an organic cleansing solution in which the aqueous bleach phase is aqueous sodium hypochlorite for a short period of time, say 3 to 15 minutes. Then, hydrogen peroxide is added and a further cleansing action is effected.
  • This sequence of aqueous bleaching agents provides a unique.combination of the particularly effective qualities of each.
  • by utilizing the hydrogen peroxide step last, only hydrogen peroxide is left in the fabric. It can be removed by treatment with the alcohol containing solvent rinse solution.
  • Temperatures of treatment in each of the steps herein discussed are those normally encountered in cleaning operations. Ergo the prcoess can be effectively used without recourse to unsual conditions of pressure or temperature.
  • a method of treating fabric which comprises contacting the fabric with a cleaning bath having as its principal components a continuous phase of substantially water immiscible organic cleaning solvent which constitutes a major portion of the bath and having dispersed therein and constituting a minor portion of the bath, a discontinuous distinct aqueous bleaching phase substantially immiscible in the organic cleaning solvent of a water soluble bleaching agent which bleaching agent is substantially insoluble in the water immiscible organic cleaning solvent of the continuous phase, terminating contact between the fabric and cleaning bath before serious fabric degradation due to the bleaching agent occurs and removing residual bleaching agent remaining in the fabric by rinsing the fabric with a substantially water immiscible organic cleaning solvent having a minor amount of a 2 to 5 carbon monohydric alkanol.
  • the solvent is a l to 3 carbon halogenated hydrocarbon and the bleaching agent in the bleaching phase is selected from the group consisting of hydrogen peroxide, alkali metal peroxides, hypochlorous acid and alkali metal hypochlorites.
  • a method of treating fabric which comprises contacting the fabric With a two phase cleaning bath having an organic suspending agent and as its principal components a continuous phase of substantially water immiscible organic 1 to 3 carbon chlorinated hydrocarbon cleaning solvent constituting a major portion of the bath having dispersed therein and constituting a minor portion of the bath a distinct discontinuous aqueous bleaching phase substantially immiscible in the organic cleaning solvent of a water soluble bleaching agent selected from the group consisting of hydrogen peroxide, alkali metal peroxides, hypochlorous acid and alkali metal hypochlorites, terminating contact between fabric and cleaning bath before serious fabric degradation due to the bleaching agent occurs and removing residual bleaching agent remaining in the fabric from said treatment by rinsing the fabric with a single liquid phase rinse of the same organic cleaning solvent used in cleaning having a minor concentration of a 2 to carbon monohydric alkanol.
  • a water soluble bleaching agent selected from the group consisting of hydrogen peroxide, alkali metal peroxides, hypo
  • a method of treating fabric with both oleophilic and hydrophilic characteristics which comprises contacting the fabric with a two phase cleaning composition having as principal components a continuous phase of substantially water immiscible organic halogenated hydrocarbon cleaning solvent throughout which is dispersed a distinct aqueous organic immiscible phase of a water soluble bleaching agent, which bleaching agent is substantially insoluble in the organic halogenated hydrocarbon cleaning solvent of the continuous phase, said dispersed distinct aqueous phase constituting from 0.1 to percent by weight of the cleaning solvent in the continuous phase, separating the fabric from contact with the composition before significant fabric degradation occurs and promptly removing residual bleaching agent in the fabric by rinsing the fabric with organic substantially water immiscible cleaning solvent which has a minor portion of a 2 to 5 carbon monohydric alkanol.
  • the cleaning composition also has a long chain alkyl sodium phosphate
  • the solvent is selected from the group consisting of methylchloroform, perchloroethylene and trichloroethylene
  • the bleaching agent is selected from the group consisting of hydrogen peroxide, alkali metal peroxides, hypochlorous acid and alkali metal hypochlorites.
  • a method of removing residual water soluble bleaching agent from a fabric containing residual bleaching agent from a cleansing treatment in which the fabric has been contacted with the water soluble bleaching agent which comprises rinsing the fabric with a rinse composi tion of a substantially water insoluble organic cleaning solvent containing dissolved therein a minor concentration of a 2 to 5 carbon monohydric alkanol.
  • the alkanol concentration in the rinse composition is from 1 to 15 percent by volume of the organic cleaning solvent, and the rinse composition includes a water soluble lower alkyl ether of a glycol which is also soluble in the organic cleaning solvent.
  • the rinse composition is a single liquid phase and contains water in a concentration from 0.1 to 10 weight percent of the organc solvent.

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  • Chemical & Material Sciences (AREA)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859044A (en) * 1972-09-27 1975-01-07 Diamond Shamrock Corp Process for bleaching goods during drycleaning
US3990844A (en) * 1973-12-11 1976-11-09 Ppg Industries, Inc. Method of removing hydrogen peroxide from drycleaning solvents
US4207072A (en) * 1974-02-28 1980-06-10 Bruckner Apparatebau Gmbh Processes for removing impurities from textile materials

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989005881A1 (en) * 1987-12-21 1989-06-29 Aga Aktiebolag A method of bleaching cotton
DE4123333A1 (de) * 1991-07-15 1993-01-21 Henkel Kgaa Mehrkomponenten-waschmittelsystem
WO2001090474A1 (en) 2000-05-23 2001-11-29 Unilever Plc Process for cleaning fabrics
RU2765469C1 (ru) * 2021-06-17 2022-01-31 Александр Ливиевич Ураков Отбеливатель пятен загустевшего млечного сока одуванчика

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859044A (en) * 1972-09-27 1975-01-07 Diamond Shamrock Corp Process for bleaching goods during drycleaning
US3990844A (en) * 1973-12-11 1976-11-09 Ppg Industries, Inc. Method of removing hydrogen peroxide from drycleaning solvents
US4207072A (en) * 1974-02-28 1980-06-10 Bruckner Apparatebau Gmbh Processes for removing impurities from textile materials

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Publication number Publication date
FR2061651A1 (enrdf_load_stackoverflow) 1971-06-25
NL139355B (nl) 1973-07-16
GB1312284A (en) 1973-04-04
FR2061651B1 (enrdf_load_stackoverflow) 1974-03-01
BE756007A (fr) 1971-03-10
CA921209A (en) 1973-02-20
NL7011099A (enrdf_load_stackoverflow) 1971-03-15
DE2045008A1 (de) 1971-03-25
SE372297B (enrdf_load_stackoverflow) 1974-12-16
DE2045008B2 (enrdf_load_stackoverflow) 1974-01-03

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