GB1179238A - Semi-Permeable Membrane. - Google Patents
Semi-Permeable Membrane.Info
- Publication number
- GB1179238A GB1179238A GB22524/66A GB2252466A GB1179238A GB 1179238 A GB1179238 A GB 1179238A GB 22524/66 A GB22524/66 A GB 22524/66A GB 2252466 A GB2252466 A GB 2252466A GB 1179238 A GB1179238 A GB 1179238A
- Authority
- GB
- United Kingdom
- Prior art keywords
- water
- semi
- permeable membrane
- acetic acid
- cellulose acetate
- 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
- 239000012528 membrane Substances 0.000 title abstract 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 abstract 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 4
- 229920002301 cellulose acetate Polymers 0.000 abstract 3
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- 230000015271 coagulation Effects 0.000 abstract 2
- 238000005345 coagulation Methods 0.000 abstract 2
- 238000010612 desalination reaction Methods 0.000 abstract 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 abstract 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 abstract 1
- 239000004372 Polyvinyl alcohol Substances 0.000 abstract 1
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 abstract 1
- 238000005266 casting Methods 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 235000010944 ethyl methyl cellulose Nutrition 0.000 abstract 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 abstract 1
- 238000007654 immersion Methods 0.000 abstract 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 abstract 1
- 229920003087 methylethyl cellulose Polymers 0.000 abstract 1
- 229920002451 polyvinyl alcohol Polymers 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
Classifications
-
- 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
- B01D71/12—Cellulose derivatives
- B01D71/14—Esters of organic acids
- B01D71/16—Cellulose acetate
-
- 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
- B01D67/0011—Casting solutions therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
1,179,238. Semi-permeable membrane of cellulose acetate. COURTAULDS Ltd. 19 May, 1967 [20 May, 1966], No. 22524/66. Heading B5B. [Also in Divisions B1 and C3] A semi-permeable membrane for desalination of water is prepared by forming a solution of cellulose acetate in aqueous acetic acid containing 5-25% of water by weight, casting as a film of uniform thickness and removing the acetic acid by immersing in water to effect coagulation of the film. Other water-soluble pore-forming agents may also be added e.g. polyvinyl alcohol or agents soluble in the aqueous acetic acid solvent e.g. methyl and hydroxyethyl cellulose. The cellulose acetate preferably has an acetyl content of 52-56À5% by weight. It is advantageous to separate the coating and coagulation steps by at least 5 minutes. The membranes of the example were heat-shrunk by immersion in hot water to yield more efficient membranes for desalination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB22524/66A GB1179238A (en) | 1966-05-20 | 1966-05-20 | Semi-Permeable Membrane. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB22524/66A GB1179238A (en) | 1966-05-20 | 1966-05-20 | Semi-Permeable Membrane. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1179238A true GB1179238A (en) | 1970-01-28 |
Family
ID=10180772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22524/66A Expired GB1179238A (en) | 1966-05-20 | 1966-05-20 | Semi-Permeable Membrane. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1179238A (en) |
-
1966
- 1966-05-20 GB GB22524/66A patent/GB1179238A/en not_active Expired
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