GB715015A - Improvements relating to the manufacture of organic derivatives of cellulose - Google Patents
Improvements relating to the manufacture of organic derivatives of celluloseInfo
- Publication number
- GB715015A GB715015A GB2109950A GB2109950A GB715015A GB 715015 A GB715015 A GB 715015A GB 2109950 A GB2109950 A GB 2109950A GB 2109950 A GB2109950 A GB 2109950A GB 715015 A GB715015 A GB 715015A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- precipitation
- restriction
- solution
- precipitating agent
- 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
- C08B3/22—Post-esterification treatments, including purification
- C08B3/26—Isolation of the cellulose ester
- C08B3/28—Isolation of the cellulose ester by precipitation
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)
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
<PICT:0715015/IV (a)/1> Organic derivatives of cellulose are precipitated from solutions thereof by simultaneously injecting the solution and a precipitating agent into a chamber having within it a stationary restriction to flow, the velocity of the moving fluid being such that vigorous mixing results. The restriction may be formed as an orifice plate. The physical characteristics of the precipitate may be altered by varying the temperature of the liquids, the concentration of cellulose derivative and of the precipitating agent and the rate of flow. The solution of cellulose derivative may contain suspended or dissolved colouring matters, pigments or fillers. The process is particularly applicable to the precipitation of cellulose acetate. As shown, the precipitator consists of a tubular vessel A having inlets C for the precipitating agent and D for the cellulose derivative solution, and a common outlet E for precipitate and liquid. Above the inlet pipes is situated an orifice plate B having a central hole. The results of trials in which cellulose acetate in 55 per cent. aqueous acetic acid is precipitated by dilute acetic acid, and cellulose acetate in acetone is precipitated by hot water, are reported. Specifications 338,214, [Class 23], 497,963, 531,955, 588,884 and 646,971 are referred to. The Provisional Specification refers to the precipitation of highly polymeric material in general.ALSO:<PICT:0715015/III/1> Apparatus for precipitating organic derivatives of cellulose from solutions thereof comprises a chamber A into which the precipitating agent and solution are injected through inlets C and D, the chamber being provided with a stationary restriction to flow and the velocity of the moving fluid being such that vigorous mixing results. As shown, the restriction B may take the form of an orifice plate having a central hole. A common outlet E is provided for the precipitate and the liquid. The apparatus is particularly applicable to the precipitation of cellulose acetate (see Group IV(a)). Specifications 338,214, [Class 23], 497,963, 531,955, [both in Group IV], 588,884 and 646,971, [Group IV(a)], are referred to. The Provisional Specification refers to the precipitation of highly polymeric materials in general.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2109950A GB715015A (en) | 1950-08-25 | 1950-08-25 | Improvements relating to the manufacture of organic derivatives of cellulose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2109950A GB715015A (en) | 1950-08-25 | 1950-08-25 | Improvements relating to the manufacture of organic derivatives of cellulose |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB715015A true GB715015A (en) | 1954-09-08 |
Family
ID=10157210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2109950A Expired GB715015A (en) | 1950-08-25 | 1950-08-25 | Improvements relating to the manufacture of organic derivatives of cellulose |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB715015A (en) |
-
1950
- 1950-08-25 GB GB2109950A patent/GB715015A/en not_active Expired
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