GB648632A - Improvements in or relating to the treatment of cellulosic material - Google Patents

Improvements in or relating to the treatment of cellulosic material

Info

Publication number
GB648632A
GB648632A GB14203/48A GB1420348A GB648632A GB 648632 A GB648632 A GB 648632A GB 14203/48 A GB14203/48 A GB 14203/48A GB 1420348 A GB1420348 A GB 1420348A GB 648632 A GB648632 A GB 648632A
Authority
GB
United Kingdom
Prior art keywords
chlorite
sodium
acid
alkali
chemicking
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
Application number
GB14203/48A
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB14203/48A priority Critical patent/GB648632A/en
Publication of GB648632A publication Critical patent/GB648632A/en
Expired legal-status Critical Current

Links

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
    • D06L4/20—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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

Cellulosic materials (such as bast fibres) are purified and bleached by chemicking with neutral or acid hypochlorite, immersing in an anti-chlor solution and treating with an alkali or alkaline earth chlorite at an elevated temperature at a pH about 5 to 5.5. The chemicking, which is preferably preceded by a hot alkali scour, is usually carried out with sodium or calcium hypochlorite to which an acid such as sulphuric or acetic may be added. The anti-chlor solution may be an alkali sulphite, bisulphite or thiosulphate, preferably made slightly alkaline, e.g. with a bicarbonate, Sodium chlorite is preferred for the final step, using 2 g. or more per litre, and is buffered to the required pH value, e.g. with sodium dihydrogen phosphate or acid sodium acetate. Washing is desirable after each step in the process, and the chlorite step may be followed by a peroxide treatment. An example shows the treatment of linen yarn, and the process is also applicable to bast fibres of hemp and jute, and to cotton.ALSO:Cellulosic materials (such as bast fibres) are bleached by chemicking with neutral or acid hypochlorite, immersing in an anti-chlor solution and treating with an alkali or alkaline earth chlorite at an elevated temperature at a pH about 5 to 5.5. The chemicking, which is preferably preceded by a hot alkali scour, is usually carried out with sodium or calcium hypochlorite to which an acid such sulphuric or acetic may be added. The anti-chlor solution may be an alkali sulphite, bisulphite or thiosulphate, preferably made slightly alkaline, e.g. with a bicarbonate. Sodium chlorite is preferred for the final step, using 2 g. or more per litre, and is buffered to the required pH value, e.g. with sodium dihydrogen phosphate or acid sodium acetate. Washing is desirable after each step in the process, and the chlorite step may be followed by a peroxide treatment. An example shows the treatment of linen yarn, and the process is also applicable to bast fibres of hemp and jute, and to cotton.
GB14203/48A 1948-05-26 1948-05-26 Improvements in or relating to the treatment of cellulosic material Expired GB648632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB14203/48A GB648632A (en) 1948-05-26 1948-05-26 Improvements in or relating to the treatment of cellulosic material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB14203/48A GB648632A (en) 1948-05-26 1948-05-26 Improvements in or relating to the treatment of cellulosic material

Publications (1)

Publication Number Publication Date
GB648632A true GB648632A (en) 1951-01-10

Family

ID=10036928

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14203/48A Expired GB648632A (en) 1948-05-26 1948-05-26 Improvements in or relating to the treatment of cellulosic material

Country Status (1)

Country Link
GB (1) GB648632A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903326A (en) * 1956-10-17 1959-09-08 Pennsalt Chemicals Corp Improved process for bleaching cellulose pulp using chlorate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903326A (en) * 1956-10-17 1959-09-08 Pennsalt Chemicals Corp Improved process for bleaching cellulose pulp using chlorate

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