GB460857A - A process of manufacturing crystalline substances - Google Patents
A process of manufacturing crystalline substancesInfo
- Publication number
- GB460857A GB460857A GB22454/35A GB2245435A GB460857A GB 460857 A GB460857 A GB 460857A GB 22454/35 A GB22454/35 A GB 22454/35A GB 2245435 A GB2245435 A GB 2245435A GB 460857 A GB460857 A GB 460857A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- per cent
- maintained
- mixture
- caustic soda
- 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
- B01D9/00—Crystallisation
- B01D9/0004—Crystallisation cooling by heat exchange
- B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0004—Crystallisation cooling by heat exchange
- B01D9/0009—Crystallisation cooling by heat exchange by direct heat exchange with added cooling fluid
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
Crystals are obtained by adding a concentrated aqueous solution of the substance to be crystallized at a temperature above its supersaturation point to a solution of another substance promoting its crystallization, the mixture being cooled to and maintained at a temperature at which the solution to be crystallized would by itself be supersaturated. In an example a solution of sodium silicate containing 21,8 per cent Na2O and 21,1 per cent SiO2 at 60 DEG C., is added to a cold 20 per cent caustic soda solution and the mixture cooled to and maintained at a temperature of 22 DEG C. to give crystals corresponding to Na2SiO3 9H2O. The caustic solution may be replaced by a solution consisting of 5 per cent caustic soda and 15 per cent common salt. Sodium carbonate in the form of needles of Na2CO3, 7H2O is obtained by the addition of a warm solution containing 15,5 per cent NaOH and 13,4 per cent anhydrous Na2CO3 to a 22 per cent caustic soda solution, the mixture being maintained at 20 DEG C. Sodium nitrate solution is used in promoting the crystallization of borax. Specifications 427,496 and 427,497 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL460857X | 1934-08-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB460857A true GB460857A (en) | 1937-02-05 |
Family
ID=19786386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22454/35A Expired GB460857A (en) | 1934-08-08 | 1935-08-08 | A process of manufacturing crystalline substances |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB460857A (en) |
-
1935
- 1935-08-08 GB GB22454/35A patent/GB460857A/en not_active Expired
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