GB427386A - Refined ethers of polysaccharides and processes of making same - Google Patents
Refined ethers of polysaccharides and processes of making sameInfo
- Publication number
- GB427386A GB427386A GB2016433A GB2016433A GB427386A GB 427386 A GB427386 A GB 427386A GB 2016433 A GB2016433 A GB 2016433A GB 2016433 A GB2016433 A GB 2016433A GB 427386 A GB427386 A GB 427386A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- ether
- refined
- heating
- cellulose
- 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
- C08B11/20—Post-etherification treatments of chemical or physical type, e.g. mixed etherification in two steps, including purification
- C08B11/22—Isolation
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
Carbohydrate ethers are refined by treating a solution of the ether with a precipitating or coagulating agent so as to cause precipitation of a part of the ether and separating the precipitate from the solution of the refined ether which remains. The precipitation may be effected by adding a salt such as sodium chloride or sodium sulphate, or by heating the solution. In an example, sodium sulphate is added to an aqueous solution of ethyl, methyl, or propyl cellulose, the precipitate obtained is separated by filtration or centrifuging, and the refined ether separated from the clear solution by heating. In another example, a combination of heating and addition of sodium sulphate is used to precipitate the ether from the unrefined solution. Other examples are included in which the sodium sulphate is replaced by sodium chloride. In a further example, to a solution of cellulose ether is added a small amount of egg albumen and the solution is partially precipitated by heating. In other examples, the carbohydrate ethers subjected to the refining process are the ethyl, methyl, or propyl ethers of an ethylene glycol or propylene glycol ether of cellulose, and a simple or mixed starch ether. In another example, a water-insoluble ethyl cellulose is partially precipitated from solution in aqueous alcohol by the addtion of a solution of sodium chloride, and the refined ether separated from the clear solution by precipitation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2016433A GB427386A (en) | 1933-07-17 | 1933-07-17 | Refined ethers of polysaccharides and processes of making same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2016433A GB427386A (en) | 1933-07-17 | 1933-07-17 | Refined ethers of polysaccharides and processes of making same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB427386A true GB427386A (en) | 1935-04-17 |
Family
ID=10141438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2016433A Expired GB427386A (en) | 1933-07-17 | 1933-07-17 | Refined ethers of polysaccharides and processes of making same |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB427386A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4296235A (en) * | 1979-03-29 | 1981-10-20 | Henkel Kommanditgesellschaft Auf Aktien | Process for the removal of alkali metal halides from cellulose ethers soluble in cold water and use of the purified products in washing and cleansing agent compositions |
| EP1375523A1 (en) * | 2002-06-21 | 2004-01-02 | Shin-Etsu Chemical Co., Ltd. | Water-soluble cellulose ether having improved filtering characteristics |
-
1933
- 1933-07-17 GB GB2016433A patent/GB427386A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4296235A (en) * | 1979-03-29 | 1981-10-20 | Henkel Kommanditgesellschaft Auf Aktien | Process for the removal of alkali metal halides from cellulose ethers soluble in cold water and use of the purified products in washing and cleansing agent compositions |
| US4364836A (en) | 1979-03-29 | 1982-12-21 | Henkel Kommanditgesellschaft Auf Aktien | Process for the removal of alkali metal halides from cellulose ethers soluble in cold water and use of the purified products in washing and cleansing agent compositions |
| EP1375523A1 (en) * | 2002-06-21 | 2004-01-02 | Shin-Etsu Chemical Co., Ltd. | Water-soluble cellulose ether having improved filtering characteristics |
| US6960660B2 (en) | 2002-06-21 | 2005-11-01 | Shin-Etsu Chemical Co., Ltd. | Water-soluble cellulose ether having improved filtering characteristics and selection method |
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