US2900219A - Bleaching process by means of chlorites - Google Patents

Bleaching process by means of chlorites Download PDF

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Publication number
US2900219A
US2900219A US533005A US53300555A US2900219A US 2900219 A US2900219 A US 2900219A US 533005 A US533005 A US 533005A US 53300555 A US53300555 A US 53300555A US 2900219 A US2900219 A US 2900219A
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US
United States
Prior art keywords
goods
per liter
chlorite
bleaching
grams per
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
US533005A
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English (en)
Inventor
Waibel Wilhelm
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.)
Hoechst AG
Original Assignee
Hoechst AG
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
Priority claimed from DEF15697A external-priority patent/DE1013253B/de
Application filed by Hoechst AG filed Critical Hoechst AG
Application granted granted Critical
Publication of US2900219A publication Critical patent/US2900219A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the chlorites because of their energetic but fiber preserving bleaching eifect are increasingly used for, bleaching cel lulosic as well as entirely synthetic fibers.
  • the materials to be bleached are generally treated at 60 100 C. in aqueous chlorite solutions.
  • Another manner of operating consists in impregnating the material to be treated with chlorite solutions .and subsequently activating the chlorite incorporated in the goods, by means of a steam treatment, at temperatures of slightly more or less than 100 C.
  • the last mentioned process in addition to a reduced bleaching period, primarily offers the advantage of a more uniform bleaching and an energetic decomposing effect on accompanying substances such as seed husks, flax straw, albuminous substances etc.
  • the disadvantage connected with this process consists in an increase of consumption of the bleaching agents, amounting to 3060%. This higher consumption of bleaching agents is caused partly by the disproportionation of the chlorite to non-bleaching chloride and chlorate, in part by the escaping of chlorine dioxide which is formed to a considerable extent under the conditions of the steaming process.
  • the Belgian Patent 527,711 discloses a process in which the textile material is impregnated with an aqueous chlorite solution and subsequently heated, by means of steam, to temperatures up to 100 C.; then the heated goods are allowed to rest for 1-2V2 hours at the elevated temperature, the time of rest being correlated to the impregnation period. It must amount to 5-15 times the impregnation period. Therefore, a time of rest of 1-2 /2 hours corresponds to an impregnation time of 4-30 minutes. In order to obtain useful results within the aforementioned periods, it is necessary to apply temperatures above 85 C. Thereby, the above-mentioned disadvantages entailed by the steam treatment at about 100 C., i.e. the evolution of large quantities of chlorine dioxide cannot be avoided.
  • the present invention is based on the observation that it is possible to make use of the advantages of a uniform bleaching and an energetic decomposition effect on the accompanying substances, practically without entailing the above mentioned disadvantages, by impregnating the goods to be treated with a chlorite solution which, thereafter, is caused to act upon the goods at considerably reduced temperatures, preferably between about 40 and about 70 C.
  • the impregnation wet goods are advantageously first squeezed or exhausted in order to reduce the moisture content to a value below 100%, and then impregnated by repeatedly dipping them into the impregnation bath and eventually slightly squeezing them.
  • the dipping times usually required amount to less than 60 seconds, in most cases to a range between 2 and 30 seconds.
  • EXAMPLE 1 100 grams of macco (Egyptian cotton) poplin are impregnated at 60 C. with a solution containing:
  • a preliminary alkaline treatment can of course also be applied whereby the consumption of chlorite is reduced to the same extent as accompanying substances are removed.
  • each alkaline treatment usually entails an high loss of weight, a harsh handle, and as the saving in chlorite is compensated by the costs of preliminary treatment, the latter can normally be dispensed with.
  • the mercerization is of great importance for quite a number of textiles.
  • EXAMPLE 3 100 grams of a mercerized cotton fabric is impregnated at 25 C. with a solution containing 12.5 grams per liter of sodium chlorite of 80% strength +5 grams per liter of a condensation product of a fatty acid and of clearage products of proteins and showing a pH value of 8;
  • the process can be applied in the same favorable manner for the bleaching of bast fibers such as linen, hemp, ramie and the like.
  • bast fibers such as linen, hemp, ramie and the like.
  • accompanying substances for instance pectin, proteins, lignin.
  • a number of boiling operations is required before proceeding to the bleaching itself.
  • Even in these cases, several bleaching operations are required in order to obtain a good white.
  • the preliminary alkaline treatment can completely or partially be dispensed with; nevertheless, a good and uniform white is obtained.
  • EXAMPLE 4 l kilo'of alinen fabric of tow yarns containing flax straw is impregnated at 30 C., with a solutioncontainmg 30 grams per liter of sodium chlorite of 80% Strength and showing a pH-value of 4.8. Then the goods are squeezed in order to obtain a moisture content of 100%, and allowed to remain over night at 40 C. Then the goods are treated for 30 minutes at 60 C. by means of water, and rinsed. Then follows a 2 hours after-treatment at -8-0 C. with a solution containing:
  • the process according to the invention is also appropriate for the bleaching of textile fibers or articles of regenerated cellulose, of cellulose esters and of condensation and polymerisation products inclusive of mixed-condensates and copolymers.
  • EXAMPLE 7 100 grams of a cotton fabric containing a large percentage of husks is at first desized in the usual manner and, after washing, the goods are squeezed or filtered with suction in order to obtain a moisture content of 50%.
  • the moist goods are impregnated with a solution of 25 C. containing 30 grams per liter of sodium chlorite of 80% strength ands'howing a pH value of 4.2. Then they are squeezed in order to obtain a moisture content of 100%. Then the goods are heated to 73 C. by means of superheated steam, rolled up and allowed to rest at this temperature for 3 /2 hours. Subsequently they are washed at first at C. with add'itionof 0.5 gram/ liter of an alkylaryl sulfonate and 0.3 gram/ liter of an alkylphenylpolyglycol ether and then rinsed warm and cold.
  • the improvement which comprises maintaining the pH of the solution in the squeezed out goods in the range of 3.5 to range of 3.5 to 5, and maintaining the impregnated mate- 5, and effecting the heat treatment by maintaining said rial for about 4 to 5 hours at a temperature ranging goods at a temperature of from about 40 C. to about between about 40 C. to about 70 C. 70 C.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
US533005A 1954-09-09 1955-09-07 Bleaching process by means of chlorites Expired - Lifetime US2900219A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2900219X 1954-09-09
DEF15697A DE1013253B (de) 1954-09-11 1954-09-11 Verfahren zum Bleichen mit Chloriten

Publications (1)

Publication Number Publication Date
US2900219A true US2900219A (en) 1959-08-18

Family

ID=32327382

Family Applications (1)

Application Number Title Priority Date Filing Date
US533005A Expired - Lifetime US2900219A (en) 1954-09-09 1955-09-07 Bleaching process by means of chlorites

Country Status (4)

Country Link
US (1) US2900219A (enrdf_load_stackoverflow)
BE (1) BE541207A (enrdf_load_stackoverflow)
FR (1) FR1138346A (enrdf_load_stackoverflow)
GB (1) GB822603A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790343A (en) * 1971-12-10 1974-02-05 S Ikeda Method for bleaching fibrous materials and compositions therefor
US3962112A (en) * 1974-08-26 1976-06-08 Charles William Shaheen Composition and process for removing sulfur dioxide from combustion gases
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
US5370707A (en) * 1990-03-28 1994-12-06 Sando Iron Works Co., Ltd. Method for bleaching cloth

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2100496A (en) * 1936-02-18 1937-11-30 Mathieson Alkali Works Inc Bleaching of cellulosic materials
US2145062A (en) * 1930-04-17 1939-01-24 Mathieson Alkali Works Inc Bleaching of cellulosic materials
GB552567A (en) * 1940-09-27 1943-04-14 Mathieson Alkali Works Improvements in textile finishing
GB552711A (en) * 1940-09-18 1943-04-21 Mathieson Alkali Works Improvements in bleaching and finishing textiles
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
BE527711A (enrdf_load_stackoverflow) * 1952-06-07 1956-12-07

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2145062A (en) * 1930-04-17 1939-01-24 Mathieson Alkali Works Inc Bleaching of cellulosic materials
US2100496A (en) * 1936-02-18 1937-11-30 Mathieson Alkali Works Inc Bleaching of cellulosic materials
GB552711A (en) * 1940-09-18 1943-04-21 Mathieson Alkali Works Improvements in bleaching and finishing textiles
GB552567A (en) * 1940-09-27 1943-04-14 Mathieson Alkali Works Improvements in textile finishing
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
BE527711A (enrdf_load_stackoverflow) * 1952-06-07 1956-12-07

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790343A (en) * 1971-12-10 1974-02-05 S Ikeda Method for bleaching fibrous materials and compositions therefor
US3962112A (en) * 1974-08-26 1976-06-08 Charles William Shaheen Composition and process for removing sulfur dioxide from combustion gases
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
US5370707A (en) * 1990-03-28 1994-12-06 Sando Iron Works Co., Ltd. Method for bleaching cloth

Also Published As

Publication number Publication date
GB822603A (en) 1959-10-28
FR1138346A (fr) 1957-06-12
BE541207A (enrdf_load_stackoverflow)

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