US2944872A - Process for bleaching testile materials pregnated with sodium chlorite - Google Patents

Process for bleaching testile materials pregnated with sodium chlorite Download PDF

Info

Publication number
US2944872A
US2944872A US718520A US71852058A US2944872A US 2944872 A US2944872 A US 2944872A US 718520 A US718520 A US 718520A US 71852058 A US71852058 A US 71852058A US 2944872 A US2944872 A US 2944872A
Authority
US
United States
Prior art keywords
sodium chlorite
bleaching
reaction
reaction space
steam
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
Application number
US718520A
Other languages
English (en)
Inventor
Hendrikus C Vermijs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
H P Gelderman & Zonen N V
Original Assignee
H P Gelderman & Zonen N V
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by H P Gelderman & Zonen N V filed Critical H P Gelderman & Zonen N V
Application granted granted Critical
Publication of US2944872A publication Critical patent/US2944872A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • D06L4/30—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using reducing agents

Definitions

  • the invention relates to a process for bleaching textile materials, such as fibres, yarns, and knitted or woven fabrics, by means of activated sodium chlorite. More particularly, the invention relates to the bleaching of cotton fabrics by means of activated sodium chlorite.
  • Another object of the invention is to provide a process for bleaching textile materials by means of sodium chlorite, wherein the corrosion of the apparatus is effectively prevented by binding the chlorine dioxide formed during the bleaching operation.
  • Still another object of the invention is to provide a process for bleaching textile materials by means of sodium chlorite, which is adapted to be carried out continuously without undue corrosion of the apparatus.
  • the material is impregnated with sodium chlorite and treated in a closed space in which a steam atmosphere prevails, the chlorine dioxide formed during the reaction being bound by injecting a volatile reducing agent into said space.
  • a very suitable reducing agent to be used in the process according to the invention is hydrogen sulfide.
  • hydrogen sulfide At the prevalent relatively high temperatures (140 to 212 F.), hydrogen sulfide is practically insoluble in the sodium chlorite solution used for impregnating the textile material. It reacts spontaneously with the chlorine dioxide formed during the reaction, and may be rapidly and easily distributed in the reaction space.
  • the free sulphur formed by the reduction of the chloride dioxide may be discharged from the reaction space together with the treated material, and may be readily removed from the material by washing.
  • the amount of sulphur formed during the reaction is small, since only a small amount of chlorine dioxide is formed if the process is properly controlled, so that the amount of hydrogen sulfide added may likewise be small.
  • Another suitable reducing agent to be used in the process according to the invention is an aqueous solution of formaldehyde.
  • formaldehyde is converted to formic acid, which may be used for activating the sodium chlorite, so that it is not necessary to add a separate activating agent to the solution used for impregnating the material.
  • the reducing agent is supplied to the reaction space together with the steam.
  • the temperature in the reaction space is generally between 140 and 212 F. In order to provide for an effective control of this temperature, it is preferred to heat the reaction space indirectly by means of steam pipes, in addition to the direct heating by the steam supplied to the reaction space.
  • Example 1 An aqueous sodium chlorite solution is prepared by solving 20 parts by weight of 50% sodium chlorite and 2 parts by weight of sodium pyrophosphate (serving as a buflering agent) in 1000 parts of water. The solution is adjusted to a pH of 4.5 by means of acetic acid. The cloth is impregnated with this solution and pressed to obtain a humidity of The impregnated cloth is introduced, through a suitable lock, into the reaction space, in which a steam atmosphere with a temperature of 203 F. prevails. Together with the steam, an amount of hydrogen sulfide sufficient to bind the chlorine dioxide formed during the reaction is introduced into the reaction space.
  • the dosage of the hydrogen sulfide is checked during the reaction by introducing a paper strip wetted with a lead acetate solution into the reaction space through a suitable lock.
  • the cloth remains in the reaction space for 45 minutes; the amount of hydrogen sulfide supplied during this time amounts to about .3 parts by Weight on 1000 parts of cloth.
  • the cloth is removed from the reaction space through a suitable lock, washed in three successive baths at 203 F., 158 F., and room temperature, respectively, and dried.
  • Example 2 The cloth is treated as described in Example 1 except that the sodium chlorite solution is adjusted to a pH of 7 by means of acetic acid, and that an aqueous 40% solution of formaldehyde is introduced into the reaction space instead of hydrogen sulfide.
  • the amount of formaldehyde solution supplied to the reaction space 3 during the reaction time of 45 minutes is about 6 parts by weight on 1000 parts of cloth.
  • the operating conditions in particular the pH of the sodium chlorite solution (if hydrogen sulfide is used as a reducing agent), the steam temperature in the reaction space, the reaction time, and the amount of reducing agent supplied to the reaction space, are dependent on the nature of the material to be treated.
  • the most suitable conditions may be readily determined in each case by experiments. It has been found, however, that generally the preferred values are from 4 to 5 for the pH of the sodium chlorite solution, from 176 F. to 212 F. for the steam temperature, and from 45 to 90 minutes for the reaction time.
  • the cloth to be treated is supplied from a roll 1 to a bath 2, in which it is impregnatedwith the sodium chlorite solution, which may or may not be activated with formic or acetic acid, according as hydrogen sulfide or formaldehyde is used as a reducing agent.
  • the cloth is then pressed by means of the rollers 3 and introduced through a lock 4 into the reaction space 5.
  • Two rolls 6 and 7 are arranged in the space 5.
  • the incoming cloth is wound on one of these rolls, for instance on the roll 6, together with a second layer wound off from the other roll 7.
  • the roll 7 also contains a third layer which leaves the reaction space through a lock 8.
  • the incoming cloth is transferred to roll 7 by means of suitable gripping members (not shown), and wound on this roll together with one of the layers present on roll 6, while the other layer on roll 6 is removed from the reaction space through lock 8.
  • the cloth may be continuously supplied to and removed from the reaction space, and still remain in the same during the required reaction time.
  • steam is supplied to the reaction space, together with a suitable amount of a volatile reducing agent, such as hydrogen sulfide or formaldehyde. If formaldehyde is used, the solution in bath 2 need not be activated by means of an acid.
  • the cloth leaving the reaction space through lock 8 is successively led through three washing baths 10, 11 and 12, and to a drying device (not shown).
  • Heating tubes 13, through which steam is led, are provided in the lower part of the reaction space.
  • the condensates formed in the reaction space is removed by conventional means (not shown).
  • the method of neutralizing the chlorine dioxide vapors developed from the impregnated material comprising the step of introducing a volatile reducing agent selected from the group consisting of hydrogen sulfide and formaldehyde into said reaction chamber.
  • a process for bleaching textile materials comprising the steps of impregnating the material to be treated with an aqueous sodium chlorite solution adjusted to a pH between 4 and 7, removing excess solution from said material, treating the impregnated material in a closed reaction chamber heated with steam to a temperature of 1402l2 F. for 45 to minutes, and introducing a volatile reducing agent selected from the group consisting of hydrogen sulfide and formaldehyde into said reaction chamber during said treatment to neutralize the chlorine dioxide vapors developed from the impregnated material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Treatment Of Fiber Materials (AREA)
US718520A 1957-03-05 1958-03-03 Process for bleaching testile materials pregnated with sodium chlorite Expired - Lifetime US2944872A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL817339X 1957-03-05

Publications (1)

Publication Number Publication Date
US2944872A true US2944872A (en) 1960-07-12

Family

ID=19838928

Family Applications (1)

Application Number Title Priority Date Filing Date
US718520A Expired - Lifetime US2944872A (en) 1957-03-05 1958-03-03 Process for bleaching testile materials pregnated with sodium chlorite

Country Status (5)

Country Link
US (1) US2944872A (US06168776-20010102-C00028.png)
BE (1) BE564964A (US06168776-20010102-C00028.png)
FR (1) FR1192679A (US06168776-20010102-C00028.png)
GB (1) GB817339A (US06168776-20010102-C00028.png)
NL (1) NL91620C (US06168776-20010102-C00028.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141685A (en) * 1976-07-26 1979-02-27 Manufacture De Produits Chimiques Protex Societe Anonyme Method of bleaching textile fibers and activated bath for the cold bleaching of such fibers
US5370707A (en) * 1990-03-28 1994-12-06 Sando Iron Works Co., Ltd. Method for bleaching cloth

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2358866A (en) * 1943-08-13 1944-09-26 Mathieson Alkali Works Inc Acid aqueous solutions of chlorites
US2429317A (en) * 1945-06-15 1947-10-21 Mathieson Alkali Works Inc Process for shellac refining
US2513788A (en) * 1947-01-31 1950-07-04 Brown Co Bleaching of sulfate wood pulp
US2521340A (en) * 1945-05-16 1950-09-05 Olin Mathieson Bleaching of cellulosic textiles
US2526839A (en) * 1947-02-01 1950-10-24 Olin Mathieson Method of repressing the generation of chlorine dioxide

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2358866A (en) * 1943-08-13 1944-09-26 Mathieson Alkali Works Inc Acid aqueous solutions of chlorites
US2521340A (en) * 1945-05-16 1950-09-05 Olin Mathieson Bleaching of cellulosic textiles
US2429317A (en) * 1945-06-15 1947-10-21 Mathieson Alkali Works Inc Process for shellac refining
US2513788A (en) * 1947-01-31 1950-07-04 Brown Co Bleaching of sulfate wood pulp
US2526839A (en) * 1947-02-01 1950-10-24 Olin Mathieson Method of repressing the generation of chlorine dioxide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141685A (en) * 1976-07-26 1979-02-27 Manufacture De Produits Chimiques Protex Societe Anonyme Method of bleaching textile fibers and activated bath for the cold bleaching of such fibers
US5370707A (en) * 1990-03-28 1994-12-06 Sando Iron Works Co., Ltd. Method for bleaching cloth

Also Published As

Publication number Publication date
FR1192679A (fr) 1959-10-28
GB817339A (en) 1959-07-29
BE564964A (US06168776-20010102-C00028.png)
NL91620C (US06168776-20010102-C00028.png)

Similar Documents

Publication Publication Date Title
US2029985A (en) Method of bleaching
US3120424A (en) Continuous bleaching method with an alkali metal chlorite containing an activator salt
US4008044A (en) Treatment of polyester textiles to improve soil release and wettability properties
US2944872A (en) Process for bleaching testile materials pregnated with sodium chlorite
KR930005927B1 (ko) 포백의 풀빼기 정련방법
US2521340A (en) Bleaching of cellulosic textiles
US2037119A (en) Continuous bleaching process
US3449060A (en) Treatment of textile fabric
US3098694A (en) Continuous treatment of wool to shrinkproof and sensitize the same
US2499987A (en) Process for imparting shrink resistance to wool
US3094372A (en) Process of wet creaseproofing cellulose fabrics with specific aldehyde solutions containing specific metal salts and products produced thereby
US3493320A (en) Textile treatment
US3128145A (en) Shrinkproofing wool by acidification and subsequent application of alkali metal bromates and halide
US3120452A (en) Sizing polyamide filaments and yarns
RU2037592C1 (ru) Способ антимикробной отделки целлюлозосодержащего текстильного материала
US1751089A (en) Method of producing a wool finish on cotton goods
JPS5930953A (ja) 布帛の連続湿熱処理装置
GB2071718A (en) Method for bleaching with peroxide
US2864662A (en) Bleaching method
US3390464A (en) Process for treating textile fabrics
US3337931A (en) Method of producing yarns which behave as if thermoplastic
US2147056A (en) Textile material
US1289803A (en) Process of bleaching.
US2191534A (en) Manufacture and treatment of textile fabrics
US2284387A (en) Treatment of mechanical fabrics