GB928792A - Improvements in or relating to alkali cellulose and preparation of cellulose ethers therefrom which give smooth solutions - Google Patents
Improvements in or relating to alkali cellulose and preparation of cellulose ethers therefrom which give smooth solutionsInfo
- Publication number
- GB928792A GB928792A GB3374060A GB3374060A GB928792A GB 928792 A GB928792 A GB 928792A GB 3374060 A GB3374060 A GB 3374060A GB 3374060 A GB3374060 A GB 3374060A GB 928792 A GB928792 A GB 928792A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- alkali
- diluent
- methyl
- added
- 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
- C08B1/06—Rendering cellulose suitable for etherification
-
- 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
- C08B1/08—Alkali cellulose
-
- 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
Cellulosic material is contacted with aqueous alkali in the presence of an inert organic diluent at temperatures of from 0 DEG to 30 DEG C. for 1 to 3 hours, the weight ratio of diluent to cellulosic material being from 6 to 19 parts diluent to one part cellulosic material, said diluent comprising by volume (a) 70-96% of a water miscible inert organic compound selected from aliphatic alcohols having 2-5 carbon atoms, dioxane, tetrahydrofuran, and acetone, (b) 0-16% of a second water miscible inert organic compound different from (a) and consisting of methyl alcohol, ethyl alcohol, or acetone, and (c) 4-15% water, the resulting alkali cellulose being etherified if desired to form the ether. A preferred diluent composition consists of isopropyl alcohol or tertiary butyl alcohol or a mixture of either of these alcohols with methyl or ethyl alcohol. The aqueous alkaline solution may be added to the cellulose and diluent in one or two stages. Thus all the caustic alkali may be added at the start of the alkali cellulose period, or alternatively, only a portion of the caustic alkali may be added at this stage, the remainder being added at the commencement of the etherification period. From the alkali cellulose so made, cellulose ethers may be obtained by the conventional slurry method, the aqueous solutions of which exhibit very low granularity, thixotropy and gel strength. Examples describe the manufacture of sodium carboxy methyl cellulose by treating the alkali cellulose so made with a 55% by weight solution of monochloracetic acid in 87% by weight aqueous solution of isopropyl alcohol at 70 DEG C. for 90 minutes. The product is neutralized with glacial acetic acid, washed with aqueous methanol, centrifuged, vacuum-dried and pulverized. Alkali cellulose made according to the invention, is stated to be useful in preparing all types of water-soluble and alkali-soluble cellulose ethers, e.g. hydroxyalkyl, carboxyalkyl, sulphoalkyl, and alkyl celluloses and cyanoethyl, carboxymethyl hydroxyethyl, carboxymethyl methyl, and methyl hydroxyethyl celluloses. Specifications 623,276, 670,672, 688,486 and U.S.A. Specification 2,580,352 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84818159A | 1959-10-23 | 1959-10-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB928792A true GB928792A (en) | 1963-06-12 |
Family
ID=25302581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3374060A Expired GB928792A (en) | 1959-10-23 | 1960-09-30 | Improvements in or relating to alkali cellulose and preparation of cellulose ethers therefrom which give smooth solutions |
Country Status (5)
| Country | Link |
|---|---|
| CH (1) | CH406174A (en) |
| DE (1) | DE1418880A1 (en) |
| FR (1) | FR1279956A (en) |
| GB (1) | GB928792A (en) |
| SE (1) | SE303280B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE662196A (en) * | 1964-04-23 | 1900-01-01 | ||
| DE3238278A1 (en) * | 1982-10-15 | 1984-04-19 | Henkel KGaA, 4000 Düsseldorf | Process for the preparation of low-substituted, readily water-soluble carboxyalkyl-polysaccharide (mixed) ethers and corresponding polysaccharide mixed ethers |
-
1960
- 1960-09-30 GB GB3374060A patent/GB928792A/en not_active Expired
- 1960-10-12 DE DE19601418880 patent/DE1418880A1/en active Pending
- 1960-10-13 CH CH1149860A patent/CH406174A/en unknown
- 1960-10-17 SE SE992260A patent/SE303280B/xx unknown
- 1960-10-21 FR FR40859A patent/FR1279956A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH406174A (en) | 1966-01-31 |
| SE303280B (en) | 1968-08-26 |
| DE1418880A1 (en) | 1969-02-06 |
| FR1279956A (en) | 1961-12-29 |
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