GB489720A - Improvements in or relating to the manufacture of cellulose esters - Google Patents

Improvements in or relating to the manufacture of cellulose esters

Info

Publication number
GB489720A
GB489720A GB309037A GB309037A GB489720A GB 489720 A GB489720 A GB 489720A GB 309037 A GB309037 A GB 309037A GB 309037 A GB309037 A GB 309037A GB 489720 A GB489720 A GB 489720A
Authority
GB
United Kingdom
Prior art keywords
acid
acetic
anhydride
sulphuric
mixture
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
GB309037A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB309037A priority Critical patent/GB489720A/en
Publication of GB489720A publication Critical patent/GB489720A/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
    • C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
    • C08B1/02—Rendering cellulose suitable for esterification

Landscapes

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

Abstract

Cellulosic material is immersed for a period not exceeding one hour in a liquid medium which is maintained at a temperature below 30 DEG C. and which contains a polybasic inorganic acid catalyst in an amount equal to 8 to 20 per cent of the weight of the cellulosic material, and just sufficient organic acid anhydride to render and maintain the mixture anhydrous during the treatment. The treated material may then be subjected to acetylation or other esterification treatment. The catalyst may be sulphuric, phosphoric, or a mixture of these acids. The anhydrous medium may contain acetic, propionic, or butyric acid. The proportion of anhydride is just sufficient to react with any water present in the materials and formed by reaction between the sulphuric or other inorganic acid and the cellulose, the assumption being made that one molecule of water is liberated by each molecule of sulphuric acid by esterification of the cellulose. On completion of the pretreatment, more acetic or other organic anhydride is added, and organic esterification is carried out preferably at low temperature. The pretreatment specified may be preceded by other pretreatment processes. In an example, cotton is pretreated with acetic acid containing a very small amount of sulphuric acid, then pretreated with a mixture of acetic acid, sulphuric acid, and sufficient acetic anhydride to remove water present and formed by reaction between sulphuric acid and cotton. The mixture is cooled and a cooled solution of acetic anhydride in acetic acid is added. When all the cotton has dissolved, water is added and ripening is carried out till the product reaches acetone-solubility.
GB309037A 1937-02-02 1937-02-02 Improvements in or relating to the manufacture of cellulose esters Expired GB489720A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB309037A GB489720A (en) 1937-02-02 1937-02-02 Improvements in or relating to the manufacture of cellulose esters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB309037A GB489720A (en) 1937-02-02 1937-02-02 Improvements in or relating to the manufacture of cellulose esters

Publications (1)

Publication Number Publication Date
GB489720A true GB489720A (en) 1938-08-02

Family

ID=9751754

Family Applications (1)

Application Number Title Priority Date Filing Date
GB309037A Expired GB489720A (en) 1937-02-02 1937-02-02 Improvements in or relating to the manufacture of cellulose esters

Country Status (1)

Country Link
GB (1) GB489720A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915474A (en) * 1954-03-04 1959-12-01 Celanese Corp Preparation of partially frozen liquid mixtures

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915474A (en) * 1954-03-04 1959-12-01 Celanese Corp Preparation of partially frozen liquid mixtures

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