Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
  • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
  • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
  • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
  • C23F11/04—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids
• • 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
  • D06L4/24—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 chlorites or chlorine dioxide
  • D06L4/26—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 chlorites or chlorine dioxide combined with specific additives

Definitions

• the present invention relates to improved bleaching and disinfecting agents.
• a method is employed using as an active reagent a Water-soluble chlorite or chlorine dioxide, in an aqueous solution containing in addition an acid derived from a nitrogen oxide'a'nd/or a salt of such an acid.
• a Water-soluble chlorite or chlorine dioxide is particularly useful.
• nitric acid or nitrates especially sodium nitrate; furthermore, nitrous acid or its salts may be used since they are oxidized with formation of nitric acid 'or nitrate and thereby become effective.
• the acids and salts to be'use'd according to this invention may be added to the bleaching baths in addition to the usual auxiliary agents "necessary for adjusting the pH-val-ue such as hydrochloric acid, acetic acid, phosphoric acid, bisulfates, primary ortho-phosphates or the like, either before or after the adjustment of the pH. It is also possible, however, to make use of the acids of the nitrogen oxides and the salts thereof for standardizing the pH necessary for the desired rate of bleaching. 1
• the quantities, for instance, of nitrates to be added to the chlorite baths as a means for ,preventing corrosion, may vary within wide limits. Particularly in the case of low 'concentrations'of ClOz-ions or chlorine dioxide care must be taken, however, that the quantity of the nitrates added is not too small. It has been found that the quantities of the acids of nitrogen oxides required depend in each case on the percentage of ClOz-ions or chlorine dioxide present in the bleaching solution, especially in the case of low concentrations.
• an enhanced protection against corrosion is obtained by adding to the bleaching bath, besides the acid derived from a nitrogen oxide and/or a salt thereof, a sulfonic acid and/or carboxylic acid or a salt of either which acid or salt contains an aliphatic radical of high molecular weight which is interrupted by a carbcxylic-amide 3 or carboxylic ester group.
• the aliphatic radical should contain at least 6 carbon atoms.
• sulfonic acids or carboxylic acids of high molecular weight there enter into consideration, for instance, the reaction products of fatty acids with aminosulfonic acids or aminocarboxylic acids or with degraded proteins, furthermore condensation products from fatty acid salts and halogen carboxylic acids or halogen sulfonic acids.
• Such compounds are widely known as surface-active substances.
• the pH of the bleaching baths may be adjusted by means of the usual inorganic and/or organic acids or salts thereof.
• the bleaching baths may also contain bufier substances such as sodium acetate, mono-phosphate, diphosphate or pyrophosphate, or the like.
• Fibrous material treated as described above is distinguished by a very good absorbing capacity.
• EXAMPLE 1 This example shows how corrosion may be prevented by the addition of nitric acid or a nitrate to a sodium chlorite bath.
• EXAMPLE 2 This example shows how corrosion may be prevented and how sodium chlorite bleaching baths may be stabilized by the addition of a nitrate and a surface-active carboxylic acid or sulfonic acid.
• Sheets of an iron alloy containing 0.1% C+18% Cr+10% Ni With additions of Mo and Ti were placed at 60-65 C. for 240 hours in baths containing 1 gram of sodium chlorite per liter and having a pH 3, the baths being renewed 10 times within the specified period.
• a method of inhibiting the corrosion of stainless steel in contact with an acidic aqueous solution of a water-soluble chlorite comprising: adding to said solution an alkali metal nitrate in an amount ranging from about .6 mole to about 1.0 mole for each mole of the water-soluble chlorite.
• a method according to claim 1, comprising the further addition of a member selected from the group consisting of sulfonic acids and carboxylic acids containing an aliphatic radical of high molecular weight which is interrupted by a carboxylic amide group and of the sulfonic acids and carboxylic acids containing an ali-- phatic radical of high molecular weight which is interrupted by a carboxyiic ester group and of the salts thereof.
• a method of inhibiting the corrosion of stainless steel in contact with an acidic aqueous solution of a water-soluble chlorite comprising: adding to said solution sodium nitrate in an amount ranging from about .6 mole to about 1.0 mole for each mole of water-soluble chlorite and further adding the sodium salt of a sulfonic acid containing an aliphatic radical of high molecular weight which is interrupted by a carboxylic amide group.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Textile Engineering (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Preventing Corrosion Or Incrustation Of Metals (AREA)
• Apparatus For Disinfection Or Sterilisation (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

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Cited By (9)

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Citations (4)

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• 0
  • BE BE500190D patent/BE500190A/xx unknown
  • NL NL74491D patent/NL74491C/xx active
• 1950
  • 1950-12-12 US US200493A patent/US2691637A/en not_active Expired - Lifetime
  • 1950-12-14 CH CH293680D patent/CH293680A/de unknown
  • 1950-12-14 CH CH291790D patent/CH291790A/de unknown
  • 1950-12-22 GB GB31293/50A patent/GB696967A/en not_active Expired
  • 1950-12-26 FR FR1030121D patent/FR1030121A/fr not_active Expired
• 1954
  • 1954-03-09 US US415175A patent/US2711363A/en not_active Expired - Lifetime

Patent Citations (4)

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