GB879944A - Process for removing sodium chloride from aqueous caustic soda solutions - Google Patents
Process for removing sodium chloride from aqueous caustic soda solutionsInfo
- Publication number
- GB879944A GB879944A GB37837/57A GB3783757A GB879944A GB 879944 A GB879944 A GB 879944A GB 37837/57 A GB37837/57 A GB 37837/57A GB 3783757 A GB3783757 A GB 3783757A GB 879944 A GB879944 A GB 879944A
- Authority
- GB
- United Kingdom
- Prior art keywords
- caustic soda
- membrane
- sulphonic acid
- resins
- phenol
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/02—Control effected by setting a graduated member on the camera in accordance with indication or reading afforded by a light meter, which may be either separate from or built into camera body
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/28—Purification; Separation
- C01D1/38—Purification; Separation by dialysis
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Urology & Nephrology (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Sodium chloride is removed from aqueous caustic soda solution by osmosis employing as the membrane a synthetic resin in gel form swellable but insoluble in aqueous and alkaline media which resin contains polar groups; the opposite side of the membrane is in contact with water or a weaker pure caustic soda solution. Resins referred to are condensation products of phenol or phenol sulphonic acid with aldhehydes and polar groups referred to are sulphonic acid, hydroxyl and carboxylic acid groups. The artificial resins may be reinforced by inert synthetic resins or by asbestos or glass. According to an example, a phenol sulphonic acid is dissolved in a formaldehyde solution and the resulting solution employed to impregnate a polyvinyl chloride fabric, after which condensation is effected at 85 DEG C. in an atmosphere saturated with water vapour or by passage over steam heated rolls. The membrane is employed to purify industrial caustic soda.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE879944X | 1956-12-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB879944A true GB879944A (en) | 1961-10-11 |
Family
ID=6819221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37837/57A Expired GB879944A (en) | 1956-12-04 | 1957-12-04 | Process for removing sodium chloride from aqueous caustic soda solutions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB879944A (en) |
-
1957
- 1957-12-04 GB GB37837/57A patent/GB879944A/en not_active Expired
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