GB978494A - Improvements in and relating to bleaching alginic acid - Google Patents

Improvements in and relating to bleaching alginic acid

Info

Publication number
GB978494A
GB978494A GB2370763A GB2370763A GB978494A GB 978494 A GB978494 A GB 978494A GB 2370763 A GB2370763 A GB 2370763A GB 2370763 A GB2370763 A GB 2370763A GB 978494 A GB978494 A GB 978494A
Authority
GB
United Kingdom
Prior art keywords
alginic acid
bleaching
treated
alginate solution
prepared
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
GB2370763A
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of GB978494A publication Critical patent/GB978494A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
    • C08B37/006—Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
    • C08B37/0084—Guluromannuronans, e.g. alginic acid, i.e. D-mannuronic acid and D-guluronic acid units linked with alternating alpha- and beta-1,4-glycosidic bonds; Derivatives thereof, e.g. alginates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Molecular Biology (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

Crude alkaline alginate solution, obtained from brown algae by means of alkali, is treated with an amount of hypochlorate, hypobromite, chlorine, bromine or mixtures thereof insufficient to cause complete bleaching of the alginate solution and the alginic acid is precipitated. This acid, or an alkali metal alginate prepared there-from is then subjected to bleaching with chlorine dioxide. In one embodiment an alginate solution containing 0.1-0.5% by weight of alginic acid, prepared by alkali treatment of laminaria digitata and laminaria cloustonii, is treated with a quantity of hypochloride, hypobromite, &c., in aqueous solution at 0-60 DEG C. such that it is used up in 3-10 minutes by a 0.1% alginate solution. The alginic acid is then precipitated with mineral acid, and some of the liquid is removed from the suspension by flotation sedimentation or centrifuging. The suspension (1-8% solids) is then treated with chlorine dioxide in amount 10-100% in excess of that which is consumed by the alginic acid in 1 hour.Excess chlorine dioxide is removed by a reducing agent. Alkali metal alginates prepared from alginic acid thus bleached in two stages have increased viscosities.
GB2370763A 1962-06-16 1963-06-14 Improvements in and relating to bleaching alginic acid Expired GB978494A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH46093A DE1188065B (en) 1962-06-16 1962-06-16 Process for the production of alginic acids of high purity

Publications (1)

Publication Number Publication Date
GB978494A true GB978494A (en) 1964-12-23

Family

ID=7156002

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2370763A Expired GB978494A (en) 1962-06-16 1963-06-14 Improvements in and relating to bleaching alginic acid

Country Status (2)

Country Link
DE (1) DE1188065B (en)
GB (1) GB978494A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0268885A2 (en) * 1986-11-21 1988-06-01 Ajorca S.A. A process for controlled depolymerization of polysaccharides
CN104788582A (en) * 2015-05-20 2015-07-22 青岛聚大洋藻业集团有限公司 Method for preparing high-quality sodium alginate from sodium alginate solution processed by chlorine dioxide

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR896081A (en) * 1942-05-23 1945-02-12 Dreiturm Seifenindustrie G M B Process for bleaching alginic acid and alginates

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0268885A2 (en) * 1986-11-21 1988-06-01 Ajorca S.A. A process for controlled depolymerization of polysaccharides
EP0268885A3 (en) * 1986-11-21 1989-03-08 Ajorca S.A. A process for controlled depolymerization of polysaccharides
CN104788582A (en) * 2015-05-20 2015-07-22 青岛聚大洋藻业集团有限公司 Method for preparing high-quality sodium alginate from sodium alginate solution processed by chlorine dioxide
CN104788582B (en) * 2015-05-20 2017-01-04 青岛聚大洋藻业集团有限公司 Utilize the method that high-quality Algin prepared by chlorine dioxide treatment Algin glue

Also Published As

Publication number Publication date
DE1188065B (en) 1965-03-04

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