GB630937A - Improvements in the manufacture of esters of cellulose - Google Patents
Improvements in the manufacture of esters of celluloseInfo
- Publication number
- GB630937A GB630937A GB19187/47A GB1918747A GB630937A GB 630937 A GB630937 A GB 630937A GB 19187/47 A GB19187/47 A GB 19187/47A GB 1918747 A GB1918747 A GB 1918747A GB 630937 A GB630937 A GB 630937A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- solution
- added
- acetate
- acid
- 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
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
Cellulose is substantially completely esterified in the presence of an inorganic acid catalyst under conditions such that a primary cellulose ester is obtained; to the solution there is added a neutralizing agent, other than an alkali metal or ammonium compound, in an amount at least equivalent to the total amount of inorganic acid employed in the esterification; ammonium bisulphate is added to the neutralized solution, preferably in a proportion of 3-10 per cent of the weight of the cellulose, and the cellulose ester is ripened in the solution at a temperature above 60 DEG C. Secondary cellulose esters of good stability are thus obtained. The neutralizing agent may be an acetate of magnesium, zinc, aluminium, calcium, barium, or strontium, or strontium oxide or hydroxide, barium oxide or hydroxide, or magnesium carbonate. In an example, cotton linters are pretreated with acetic acid containing sulphuric acid and water at 35 DEG C. The activated cellulose is treated with acetic anhydride, acetic acid, and sulphuric acid cooled to -6.5 DEG C. The reaction proceeds for 2 hours, a peak temperature of 43 DEG C. being reached. At the end of the reaction, aqueous magnesium acetate solution is added to neutralize all the sulphuric acid and provide a 10 per cent excess, and at the same time to convert unchanged acetic anhydride to acetic acid. The solution is then heated to 60 DEG C. and then steam is injected until 100 DEG C. is reached. Ammonium bisulphate is added and the cellulose acetate is allowed to ripen, the temperature dropping gradually to 90 DEG C. After 12 hours, the cellulose acetate is precipitated by adding water. The process is applicable to the production of cellulose propionate, butyrate, aceto-butyrate, and other cellulose esters.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US630937XA | 1946-07-17 | 1946-07-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB630937A true GB630937A (en) | 1949-10-24 |
Family
ID=22046878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19187/47A Expired GB630937A (en) | 1946-07-17 | 1947-07-17 | Improvements in the manufacture of esters of cellulose |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB630937A (en) |
-
1947
- 1947-07-17 GB GB19187/47A patent/GB630937A/en not_active Expired
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