GB348960A - Improvements in the manufacture of esters of cellulose or of its transformation products or of other carbohydrates - Google Patents

Improvements in the manufacture of esters of cellulose or of its transformation products or of other carbohydrates

Info

Publication number
GB348960A
GB348960A GB21989/30A GB2198930A GB348960A GB 348960 A GB348960 A GB 348960A GB 21989/30 A GB21989/30 A GB 21989/30A GB 2198930 A GB2198930 A GB 2198930A GB 348960 A GB348960 A GB 348960A
Authority
GB
United Kingdom
Prior art keywords
sulphur dioxide
pressure
cellulose
nitrogen
acetic anhydride
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
GB21989/30A
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie 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
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB348960A publication Critical patent/GB348960A/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
    • C08B3/00—Preparation of cellulose esters of organic acids

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

A modification of the process described in the parent Specification for the esterification of cellulose, or of a transformation product thereof, or of another carbohydrate in the presence of liquid sulphur dioxide, consists in carrying out the reaction under an increased pressure above that due to the use of the liquid sulphur dioxide. The additional pressure may be obtained by the introduction of an inert gas such as compressed air or nitrogen, and a limited quantity of an oxidizing agent such as described in Specification 343,655, may be present if desired. In examples: (1) cotton linters are acetylated by means of acetic anhydride in liquid sulphur dioxide, the pressure being maintained at 12 atmospheres by the introduction of nitrogen; sulphuric acid is used as the catalyst. (2) lignocellulose is treated with a mixture of acetic anhydride, propionic acid, sulphur dioxide, and sulphuric acid under a pressure of 12 atmospheres produced by means of nitrogen, the product being cellulose acetopropionate. (3) starch is treated with a mixture of acetic anhydride, sulphur dioxide and sulphuric acid under the conditions stated for example (2); acetyl starch is obtained. The subsequent after-treatment (hydrolysis) of the carbohydrate esters may likewise be carried out under an increased pressure.
GB21989/30A 1929-07-19 1930-07-21 Improvements in the manufacture of esters of cellulose or of its transformation products or of other carbohydrates Expired GB348960A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE348960X 1929-07-19

Publications (1)

Publication Number Publication Date
GB348960A true GB348960A (en) 1931-05-21

Family

ID=6257934

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21989/30A Expired GB348960A (en) 1929-07-19 1930-07-21 Improvements in the manufacture of esters of cellulose or of its transformation products or of other carbohydrates

Country Status (1)

Country Link
GB (1) GB348960A (en)

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