US3065040A - Textile bleaching process using chlorite bleaching baths - Google Patents

Textile bleaching process using chlorite bleaching baths Download PDF

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Publication number
US3065040A
US3065040A US761936A US76193658A US3065040A US 3065040 A US3065040 A US 3065040A US 761936 A US761936 A US 761936A US 76193658 A US76193658 A US 76193658A US 3065040 A US3065040 A US 3065040A
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US
United States
Prior art keywords
bleaching
acids
salts
acid
chlorite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US761936A
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English (en)
Inventor
Waibel Wilhelm
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Hoechst AG
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Hoechst AG
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Publication date
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Publication of US3065040A publication Critical patent/US3065040A/en
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Classifications

    • 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

  • This invention relates to textile bleaching processes using chlorites.
  • chlorites for bleaching textiles, particularly in processes combining padding and steaming, is known in the art.
  • Several operational methods are known, according to the oldest of which acidic solutions of chlorite are padded onto the goods to be bleached, which are subsequently steamed.
  • This process has the disadvantage that the impregnating baths are strongly active, that is they evolve chlorine dioxide gas on decomposition.
  • the goods being treated be impregnated with alkaline chlorite solutions and that the chlorite incorporated in the treated goods subsequently be activated with mixtures of acid and steam.
  • a particularly heavy evolution of chlorine dioxide occurs in the steaming chamber, and the mixture of acid, steam, and chlorine dioxide is considerably corrosive to the apparatus used.
  • salts of strong acids and weak bases e.g. ammonium salts of strong acids
  • weak bases e.g. ammonium salts of strong acids
  • These salts replace the esters as substances forming acid during the steaming process.
  • These salts which are hydrolyzed only at temperatures above 60 0., form acid and cause an activation of the chlorite on the fiber treated.
  • these acid-forming substances are relatively cheap compounds, their use is impaired by the fact that the acids formed injure the goods being treated.
  • a similar eifect is obtained by adding to the impregnation baths mixtures of salts of strong bases and weak acids together with weak acids difierent from those acids from which the salts are derived. When using such mixtures, bleaching is delayed only shortly due to the higher quantity of buffer substances present.
  • Suitable salts of weak acids and strong bases are, for example: sodium formate or the corresponding acetate, propionate, citrate, lactate, tartrate, and benzoate.
  • the corresponding potassium salts can be used instead of sodium salts, as can the salts of the alkaline earth metals if sutliciently soluble.
  • the organic acids are especially suitable, such as formic acid, acetic acid, propionic acid, lactic acid, tartaric acid, citric acid, benzoic acid and the like.
  • the first dissociation constants of these acids all lie between about 1 10- and about 1.4 l0- which are the first dissociation constants of tartaric and propionic acids, respectively.
  • the average degree of polymerization of the fabric after bleaching was 1820, as compared with an average degree of polymerization in the raw material of 2960.
  • the bleached fabric had a degree of whiteness of 84.3%. Seed husks were completely destroyed.
  • Example 2 By proceeding as in Example 1, but ad justing the solution to a pH of 7 by the addition of acetic acid to the chlorite bath, a bleached fabric with a degree of whiteness of 84.2% was obtained.
  • the average degree of polymerization in the bleached fibers was 2760, as compared with 2960 in the raw material. Thus, the fiber has not been damaged, although the seed husks are completely destroyed.
  • the average degree of polymerization in the bleached material was 2810, as compared with a value of 2960 in the raw material. Seed husk residues still remained after treatment.
  • the reduced degree of bleaching obtained and the incomplete destruction of seed husks, despite a bleaching time equal to that of the earlier examples, are due in this process to the delay occurring in reaching the bleaching stage.
  • the bleaching time is increased to 1% hours, the seed husks are completely destroyed and the degree of whiteness of the fabric is raised to about 83.9% without significant reduction in the average degree of polymerization.
  • the goods bleached were not damaged.
  • a prolonged bleaching period is required by the delayed activation of the chlorite, caused by the presence of the buffer substances added.
  • Example 4 Provides as in Example 3 above, but with the addition to the chlorite impregnation bath of such an amount of acetic acid as is necessary to bring the bath to a pH of 6.5, complete bleaching is attained within 75 minutes with destruction of all seed husks.
  • the degree of whiteness was 84.1%.
  • the average degree of polymerization of the bleached material was 2780 as compared with 2960 in the raw material.
  • the use of mixtures of bufifers salts and weak acids in bleaching has the advantage that the pH is least reduced during the bleaching process, since more butler substance is available.
  • the addition of acid to the solution reduces the bleaching period to a value comparable with that in Example 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detergent Compositions (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
US761936A 1957-09-24 1958-09-19 Textile bleaching process using chlorite bleaching baths Expired - Lifetime US3065040A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF24012A DE1168859B (de) 1957-09-24 1957-09-24 Verfahren zum Bleichen von Chloriten nach dem Klotz-Daempf-Verfahren

Publications (1)

Publication Number Publication Date
US3065040A true US3065040A (en) 1962-11-20

Family

ID=7091071

Family Applications (1)

Application Number Title Priority Date Filing Date
US761936A Expired - Lifetime US3065040A (en) 1957-09-24 1958-09-19 Textile bleaching process using chlorite bleaching baths

Country Status (6)

Country Link
US (1) US3065040A (is")
BE (1) BE571470A (is")
DE (1) DE1168859B (is")
FR (1) FR1203379A (is")
GB (1) GB898677A (is")
NL (1) NL96757C (is")

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3238226A (en) * 1962-02-19 1966-03-01 Nat Polychemicals Inc Synthesis of hydrazine, semi-carbazide, and hydrazinedicarbonamide
US4236891A (en) * 1979-02-05 1980-12-02 Olin Corporation Process for textile bleaching with dibasic magnesium hypochlorite
US4310425A (en) * 1980-04-17 1982-01-12 Halabs, Incorporated Inhibited oil field drilling fluid
USRE31779E (en) * 1976-03-26 1984-12-25 Alcide Corporation Germ-killing composition and method
US4790950A (en) * 1988-03-07 1988-12-13 The Drackett Company Aqueous alkali metal halogenite compositions containing a colorant stabilized by NH4 OH
US4873013A (en) * 1988-03-07 1989-10-10 The Dracket Company Aqueous alkali metal halogenite compositions containing a colorant stabilized by ammonium hydroxide
US4880556A (en) * 1987-05-26 1989-11-14 The Drackett Company Aqueous alkali metal halogenite compositions containing a colorant
US4891216A (en) * 1987-04-14 1990-01-02 Alcide Corporation Disinfecting compositions and methods therefor
US4963287A (en) * 1987-05-26 1990-10-16 The Drackett Company Aqueous alkali metal halogenite compositions
US4986990A (en) * 1984-03-21 1991-01-22 Alcide Corporation Disinfection method and composition therefor
US5185161A (en) * 1984-03-21 1993-02-09 Alcide Corporation Disinfection method and composition therefor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521340A (en) * 1945-05-16 1950-09-05 Olin Mathieson Bleaching of cellulosic textiles
GB723566A (en) * 1951-04-19 1955-02-09 Val Mehler Segeltuchweberei Ag Improved method of bleaching textile materials
US2739032A (en) * 1953-03-30 1956-03-20 William K Wilson Iron-catalyzed decomposition of sodium chlorite
US2810717A (en) * 1955-02-07 1957-10-22 Hercules Powder Co Ltd Chlorite bleaching in the presence of a nitrogen compound employed as a corrosion inhibitor
US2947700A (en) * 1953-12-15 1960-08-02 Hoechst Ag Inhibited chlorite baths and method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE500190A (is") * 1949-12-27

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521340A (en) * 1945-05-16 1950-09-05 Olin Mathieson Bleaching of cellulosic textiles
GB723566A (en) * 1951-04-19 1955-02-09 Val Mehler Segeltuchweberei Ag Improved method of bleaching textile materials
US2739032A (en) * 1953-03-30 1956-03-20 William K Wilson Iron-catalyzed decomposition of sodium chlorite
US2947700A (en) * 1953-12-15 1960-08-02 Hoechst Ag Inhibited chlorite baths and method
US2810717A (en) * 1955-02-07 1957-10-22 Hercules Powder Co Ltd Chlorite bleaching in the presence of a nitrogen compound employed as a corrosion inhibitor

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3238226A (en) * 1962-02-19 1966-03-01 Nat Polychemicals Inc Synthesis of hydrazine, semi-carbazide, and hydrazinedicarbonamide
USRE31779E (en) * 1976-03-26 1984-12-25 Alcide Corporation Germ-killing composition and method
US4236891A (en) * 1979-02-05 1980-12-02 Olin Corporation Process for textile bleaching with dibasic magnesium hypochlorite
US4310425A (en) * 1980-04-17 1982-01-12 Halabs, Incorporated Inhibited oil field drilling fluid
US4986990A (en) * 1984-03-21 1991-01-22 Alcide Corporation Disinfection method and composition therefor
US5185161A (en) * 1984-03-21 1993-02-09 Alcide Corporation Disinfection method and composition therefor
USRE36064E (en) * 1984-03-21 1999-01-26 Alcide Corporation Disinfection method and composition therefor
US4891216A (en) * 1987-04-14 1990-01-02 Alcide Corporation Disinfecting compositions and methods therefor
US4880556A (en) * 1987-05-26 1989-11-14 The Drackett Company Aqueous alkali metal halogenite compositions containing a colorant
US4963287A (en) * 1987-05-26 1990-10-16 The Drackett Company Aqueous alkali metal halogenite compositions
US4790950A (en) * 1988-03-07 1988-12-13 The Drackett Company Aqueous alkali metal halogenite compositions containing a colorant stabilized by NH4 OH
US4873013A (en) * 1988-03-07 1989-10-10 The Dracket Company Aqueous alkali metal halogenite compositions containing a colorant stabilized by ammonium hydroxide

Also Published As

Publication number Publication date
DE1168859B (de) 1964-04-30
GB898677A (en) 1962-06-14
BE571470A (is")
FR1203379A (fr) 1960-01-18
NL96757C (is")

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