GB1489781A - Manufacture of soda ash - Google Patents
Manufacture of soda ashInfo
- Publication number
- GB1489781A GB1489781A GB28802/74A GB2880274A GB1489781A GB 1489781 A GB1489781 A GB 1489781A GB 28802/74 A GB28802/74 A GB 28802/74A GB 2880274 A GB2880274 A GB 2880274A GB 1489781 A GB1489781 A GB 1489781A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mother liquor
- stage
- slurry
- monohydrate
- sodium fluoride
- 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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/22—Purification
- C01D7/24—Crystallisation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/35—Varying the content of water of crystallisation or the specific gravity
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1489781 Separation of sodium fluoride from sodium carbonate IMPERIAL CHEMICAL INDUSTRIES Ltd 9 June 1975 [28 June 1974] 28802/74 Heading ClA A process for the separation of sodium fluoride from an aqueous liquor comprising sodium carbonate and sodium fluoride comprises crystallizing the liquor to produce a slurry comprising sodium carbonate monohydrate and sodium fluoride in an associated mother liquor, and classifying the slurry to separate it into a first slurry portion comprising substantially sodium fluoride and a second slurry portion comprising substantially monohydrate. The process may be used for reducing the fluoride content of crude soda ash derived from crude tronaby; (i) dissolving 1 the crude soda ash in water and/ or aqueous sodium carbonate solution to provide an aqueous solution comprising sodium carbonate and sodium fluoride; (ii) evaporating 4 the aqueous solution obtained in stage (i) to produce a slurry comprising sodium carbonate monohydrate in a mother liquor comprising sodium carbonate and sodium fluoride; (iii) separating 6 the slurry into monohydrate and the mother liquor of stage (ii); (iv) evaporating 8 the mother liquor from stage (iii) in the presence of recycled mother liquor from stage (vi) to produce a slurry comprising monohydrate and sodium fluoride in a mother liquor; (v) classifying 9 the slurry from stage (iv) to separate it into a first slurry portion comprising substantially sodium fluoride and the mother liquor of stage (iv) and a second slurry portion comprising substantially monohydrate and the mother liquor of stage (iv); (vi) separating 10 the first slurry portion of (v) into sodium fluoride and mother liquor and recycling the mother liquor to stage (iv); (vii) separating 12 the second slurry portion of (v) into monohydrate and mother liquor; (viii) decomposing the monohydrate from stages (iii) and (vii) to produce soda ash. The aqueous solution of stage (i) may be settled or filtered 2 to remove insoluble impurities and treated 3 with charcoal, H 2 O 2 , hypochlorite or Cl 2 to reduce the level of organic impurities, prior to stage (ii).
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB28802/74A GB1489781A (en) | 1974-06-28 | 1974-06-28 | Manufacture of soda ash |
| ZA00753768A ZA753768B (en) | 1974-06-28 | 1975-06-12 | Manufacture of soda ash |
| AU82290/75A AU489379B2 (en) | 1974-06-28 | 1975-06-20 | Manufacture of soda ash |
| JP7946175A JPS5537487B2 (en) | 1974-06-28 | 1975-06-27 | |
| KE2832A KE2832A (en) | 1974-06-28 | 1978-03-23 | Manufacture of soda ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB28802/74A GB1489781A (en) | 1974-06-28 | 1974-06-28 | Manufacture of soda ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1489781A true GB1489781A (en) | 1977-10-26 |
Family
ID=10281419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28802/74A Expired GB1489781A (en) | 1974-06-28 | 1974-06-28 | Manufacture of soda ash |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5537487B2 (en) |
| GB (1) | GB1489781A (en) |
| KE (1) | KE2832A (en) |
| ZA (1) | ZA753768B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2337515A (en) * | 1998-04-30 | 1999-11-24 | Brunner Mond Plc | Removing fluoride impurity from sodium carbonate |
-
1974
- 1974-06-28 GB GB28802/74A patent/GB1489781A/en not_active Expired
-
1975
- 1975-06-12 ZA ZA00753768A patent/ZA753768B/en unknown
- 1975-06-27 JP JP7946175A patent/JPS5537487B2/ja not_active Expired
-
1978
- 1978-03-23 KE KE2832A patent/KE2832A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2337515A (en) * | 1998-04-30 | 1999-11-24 | Brunner Mond Plc | Removing fluoride impurity from sodium carbonate |
| GB2337515B (en) * | 1998-04-30 | 2001-09-26 | Brunner Mond Plc | Removal of fluoride impurities from soda ash |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5537487B2 (en) | 1980-09-29 |
| AU8229075A (en) | 1976-12-23 |
| ZA753768B (en) | 1976-05-26 |
| KE2832A (en) | 1978-04-07 |
| JPS5129398A (en) | 1976-03-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930609 |