GB964197A - Improvements in acetylation of cellulose - Google Patents
Improvements in acetylation of celluloseInfo
- Publication number
- GB964197A GB964197A GB3992262A GB3992262A GB964197A GB 964197 A GB964197 A GB 964197A GB 3992262 A GB3992262 A GB 3992262A GB 3992262 A GB3992262 A GB 3992262A GB 964197 A GB964197 A GB 964197A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- acetic anhydride
- acid
- fibres
- sheet
- 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
- C08B3/06—Cellulose acetate, e.g. mono-acetate, di-acetate or tri-acetate
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 acetylated by contacting substantially dry fibres with acetic acid, limiting the amount of acid contained in the fibres to 10-60% by weight, by removal of excess acid if necessary; contacting the resulting swollen fibres with acetic anhydride at a temperature from ambient to 140 DEG C. and then subjecting the fibre to noncatalysed acetylation with superheated vapour of acetic anhydride at 150 DEG C.-220 DEG C. to form dry cellulose fibres having an acetyl content of up to 30% by weight. The cellulose, in the form of wood pulp, cotton linters, mattes, webs, sheets or fabrics, may be sprayed with, or immersed in, the reagents in a continuous process or a batch process. In one embodiment, a moving sheet of cellulose fibre is sprayed with acetic acid to swell the fibre. The sheet is then sprayed with acetic anhydride while it passes over a suction box, causing displacement of a proportion of the acetic acid by the acetic anhydride, and also some acetylation. The cellulose sheet, saturated with a mixture of acid and anhydride then enters a cloud reactor in which it is passed over a series of rolls and is contacted, e.g. for 15-90 minutes, with acetic anhydride vapour at 150 DEG C.-220 DEG C. The acetylated sheet retains its original form.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20891662A | 1962-07-10 | 1962-07-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB964197A true GB964197A (en) | 1964-07-15 |
Family
ID=22776582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3992262A Expired GB964197A (en) | 1962-07-10 | 1962-10-22 | Improvements in acetylation of cellulose |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH405696A (en) |
| DE (1) | DE1468546A1 (en) |
| GB (1) | GB964197A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2271570A (en) * | 1992-10-15 | 1994-04-20 | David George Rogers | Treating lignocellusosic material with acetic anhydride |
| EP0650998A1 (en) | 1993-10-28 | 1995-05-03 | A-Cell Acetyl Cellulosics AB | Acetylation of lignocellulosic materials |
| US6723766B1 (en) | 1999-06-10 | 2004-04-20 | Yamaha Corporation | Method for manufacturing ligneous material |
| US20110091736A1 (en) * | 2009-06-25 | 2011-04-21 | Eastman Chemical Company | Esterified lignocellulosic materials and methods for making them |
-
1962
- 1962-10-22 GB GB3992262A patent/GB964197A/en not_active Expired
- 1962-11-26 CH CH1388162A patent/CH405696A/en unknown
-
1963
- 1963-06-25 DE DE19631468546 patent/DE1468546A1/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2271570A (en) * | 1992-10-15 | 1994-04-20 | David George Rogers | Treating lignocellusosic material with acetic anhydride |
| EP0650998A1 (en) | 1993-10-28 | 1995-05-03 | A-Cell Acetyl Cellulosics AB | Acetylation of lignocellulosic materials |
| US6723766B1 (en) | 1999-06-10 | 2004-04-20 | Yamaha Corporation | Method for manufacturing ligneous material |
| US20110091736A1 (en) * | 2009-06-25 | 2011-04-21 | Eastman Chemical Company | Esterified lignocellulosic materials and methods for making them |
| US8906466B2 (en) * | 2009-06-25 | 2014-12-09 | Eastman Chemical Company | Esterified lignocellulosic materials and methods for making them |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1468546A1 (en) | 1969-01-16 |
| CH405696A (en) | 1966-01-15 |
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