GB706522A - Production of organic acid esters of cellulose - Google Patents
Production of organic acid esters of celluloseInfo
- Publication number
- GB706522A GB706522A GB29996/51A GB2999651A GB706522A GB 706522 A GB706522 A GB 706522A GB 29996/51 A GB29996/51 A GB 29996/51A GB 2999651 A GB2999651 A GB 2999651A GB 706522 A GB706522 A GB 706522A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- per cent
- weight
- minutes
- pretreatment
- 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
- 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
Cellulose containing less than 5 per cent. of its weight of water is subjected to pretreatment in two stages, and then to esterification with an organic acid anhydride, the first pretreatment stage being effected with a lower aliphatic acid in the presence of 4-9 per cent. of water (calculated on the dry weight of the cellulose and including water already contained in the cellulose) for a time of at least 2 minutes, and the second pretreatment stage being effected with further lower aliphatic acid containing 3-15 per cent. (calculated on the dry weight of the cellulose) of an esterification catalyst for a time of at most 15 minutes. The lower aliphatic acid is one containing 1-4 carbon atoms in the molecule. The cellulose may be purified cotton linters or wood pulp or it may be derived from bamboo, reeds, grasses, straws, jute, esparto, seed hulls or bark. It may be pretreated in the form of loose fibres or in sheet, strip or board form. Formic, acetic, propionic or n-butyric acid or a mixture of these may be used for the pre-treatment. The first stage of pretreatment may be carried out at 25-55 DEG C. and the amount of lower aliphatic acid may be 15-75 per cent. of the weight of the cellulose. In the second stage of pretreatment the amount of aliphatic acid may be 1-6 times the weight of the cellulose. The esterification catalyst used is preferably sulphuric acid. After the pretreatment, the cellulose is esterified with an organic anhydride, with or without additional quantities of lower aliphatic acid and catalyst. The esterification may be carried out in 15-30 minutes or less. In an example, cotton linters which have been dried until they contain 0.3 per cent. by weight of water are treated by spraying with 35 per cent. of acetic acid containing 6 per cent. of water, based on the weight of the cellulose, and allowed to stand for 3 minutes. They are then sprayed with 300 per cent. of acetic acid containing 15 per cent. of sulphuric acid, based on the weight of cellulose. After 3 minutes, the cellulose is introduced into 220 per cent. of acetic anhydride and the esterification proceeds to completion in 15 minutes. Specification 683,648 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US706522XA | 1950-12-22 | 1950-12-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB706522A true GB706522A (en) | 1954-03-31 |
Family
ID=22096578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB29996/51A Expired GB706522A (en) | 1950-12-22 | 1951-12-21 | Production of organic acid esters of cellulose |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB706522A (en) |
-
1951
- 1951-12-21 GB GB29996/51A patent/GB706522A/en not_active Expired
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