GB623607A - Preparation of cellulose ethers - Google Patents
Preparation of cellulose ethersInfo
- Publication number
- GB623607A GB623607A GB10882/47A GB1088247A GB623607A GB 623607 A GB623607 A GB 623607A GB 10882/47 A GB10882/47 A GB 10882/47A GB 1088247 A GB1088247 A GB 1088247A GB 623607 A GB623607 A GB 623607A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- viscosity
- hypochlorite
- sodium
- ethyl
- 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
- C08B11/00—Preparation of cellulose ethers
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 subjected to etherification in the presence of alkali and a viscosity-regulating agent selected from the group consisting of hydrogen peroxide, an alkali-metal hypobromite, hypochlorite, hypoiodite, peroxide and periodate. In an example, high viscosity cellulose is heated with ethyl chloride, sodium hydroxide, sodium hypochlorite and water, to 140 DEG C. over a period of 8 hours, followed by maintenance at 140 DEG C. for a further 8 hours. Volatile constituents are then removed by distillation under reduced pressure, so that the ethyl cellulose is precipitated from the remaining aqueous medium. The product dissolves in benzene-alcohol mixtures to give solutions of much lower viscosity than products prepared in a similar manner, but with omission of the hypochlorite. In another example, cellulose is heated with sodium hydroxide, sodium hypochlorite, monochloracetic acid, and water, to form a carboxymethyl cellulose of reduced viscosity characteristics. It is soluble in water. The proportion of hypochlorite or other viscosity-regulating agent is varied according to the desired reduction in viscosity, and it may be 0.01-0.25 moles. per glucose unit of the cellulose. The cellulose used may be cotton linters, wood-pulp, wood flour, or sawdust. The etherifying agent may be dimethyl or diethyl sulphate; methyl, ethyl, butyl, or benzyl chloride; ethylene chlorhydrin, ethylene oxide, or propylene oxide; or a halogenated lower fatty acid such as monochloracetic acid or its sodium salt. The alkali used may be sodium, potassium or lithium hydroxide, or a quaternary ammonium base. The etherification may be carried out at 25-200 DEG C. in the case of ethyl cellulose. For carboxymethyl cellulose the temperature may be 20-75 DEG C.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US623607XA | 1946-12-24 | 1946-12-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB623607A true GB623607A (en) | 1949-05-19 |
Family
ID=22041959
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10882/47A Expired GB623607A (en) | 1946-12-24 | 1947-04-23 | Preparation of cellulose ethers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB623607A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116655810A (en) * | 2023-06-28 | 2023-08-29 | 重庆力宏精细化工有限公司 | High-permeability ultralow-viscosity sodium carboxymethyl cellulose product and preparation method and application thereof |
-
1947
- 1947-04-23 GB GB10882/47A patent/GB623607A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116655810A (en) * | 2023-06-28 | 2023-08-29 | 重庆力宏精细化工有限公司 | High-permeability ultralow-viscosity sodium carboxymethyl cellulose product and preparation method and application thereof |
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