GB1106664A - Improvements in and relating to membranes - Google Patents
Improvements in and relating to membranesInfo
- Publication number
- GB1106664A GB1106664A GB23445/65A GB2344565A GB1106664A GB 1106664 A GB1106664 A GB 1106664A GB 23445/65 A GB23445/65 A GB 23445/65A GB 2344565 A GB2344565 A GB 2344565A GB 1106664 A GB1106664 A GB 1106664A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alginate
- substrate
- membrane
- gel
- solution
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0039—Inorganic membrane manufacture
- B01D67/0046—Inorganic membrane manufacture by slurry techniques, e.g. die or slip-casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/125—In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/08—Polysaccharides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/006—Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
- C08B37/0084—Guluromannuronans, e.g. alginic acid, i.e. D-mannuronic acid and D-guluronic acid units linked with alternating alpha- and beta-1,4-glycosidic bonds; Derivatives thereof, e.g. alginates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/12—Specific ratios of components used
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2796/00—Viruses not covered by groups C12N2710/00 - C12N2795/00
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
- Biochemistry (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Materials For Medical Uses (AREA)
- Cosmetics (AREA)
Abstract
Alginate membranes are prepared by applying a layer of an aqueous solution of an alkyl ammonium alginate to a porous substrate saturated with a solution containing polyvalent cations that form an alginate gel by reaction with the alginate solution, the alginate solution before application to the substrate being mixed with a softener, and after the gel-forming process the gel and the substrate are dried. A hygroscopic liquid which is difficultly volatile is preferably used as softener, e.g. glycerol. When the membrane is washed through e.g. in the case of filtrations, the softener is washed out by water. The partly shrunk alginate membrane on drying is detached from its connection with the substrate and the membrane together with the filter residue from the substrate removed. The membrane may be floated off the substrate. In examples, a sheet of porous filter substrate is saturated with an aqueous solution of AlCl36H2O, or La(NO3)3. 6H2O. A solution of sodium alginate and glycerine is spread over the saturated substrate, whereupon an alginate gel is formed, and the whole is air dried at ambient temperature. The alginate membranes can be used in pressure apparatus.ALSO:Alginate membranes for use as ion-exchange membranes are prepared by applying a layer of an aqueous solution of an alkyl ammonium alginate to a porous substrate, for example a paper or membrane filter saturated with a solution containing polyvalent cations that form an alginate gel by reaction with the alginate solution, the alginate solution before application to the substrate being mixed with a softener, and, after the gel-forming process, the gel and the substrate are dried by being subjected to a drying process. A hygroscopic liquid which is difficultly volatile is preferably used as softener, e.g. glycerol. When the membrane is washed through, e.g. in the case of filtrations, the softener is washed out by water. The partly shrunk alginate membrane on drying is detached from its connection with the substrate and the membrane together with the filter residue from the substrate removed. The membrane may be floated off the substrate. In Example 1, a sheet of porous filter substrate is saturated with an aqueous solution of AlCl3 6H2O. A solution of sodium alginate and glycerine is spread over the saturated substrate, whereupon an alginate gel is formed, and the whole is air dried at ambient temperature. In Example 2, La (NO3)3 6H2O is used instead of AlCl3 6H2O. The alginate membranes can be used in pressure apparatus.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1964M0061265 DE1470890A1 (en) | 1964-06-05 | 1964-06-05 | Process for the production of alginate membranes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1106664A true GB1106664A (en) | 1968-03-20 |
Family
ID=7310076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23445/65A Expired GB1106664A (en) | 1964-06-05 | 1965-06-02 | Improvements in and relating to membranes |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1470890A1 (en) |
| FR (1) | FR1456501A (en) |
| GB (1) | GB1106664A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003086360A1 (en) * | 2002-04-15 | 2003-10-23 | Beisel Guenther | Agent for producing a sensation of satiety and for weight loss |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2592383B1 (en) * | 1985-12-26 | 1990-01-19 | Adeline Andre | PROCESS FOR THE PREPARATION OF A FLEXIBLE FILM OF CALCIUM ALGINATE |
| US5043069A (en) * | 1989-10-18 | 1991-08-27 | E. I. Du Pont De Nemours And Company | Filtration device having hardened gum formed-in-place membranes |
-
1964
- 1964-06-05 DE DE1964M0061265 patent/DE1470890A1/en active Pending
-
1965
- 1965-06-02 GB GB23445/65A patent/GB1106664A/en not_active Expired
- 1965-06-02 FR FR19191A patent/FR1456501A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003086360A1 (en) * | 2002-04-15 | 2003-10-23 | Beisel Guenther | Agent for producing a sensation of satiety and for weight loss |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1470890A1 (en) | 1969-02-20 |
| FR1456501A (en) | 1966-10-28 |
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