GB877737A - Improvements relating to the recovery of thiocyanates - Google Patents
Improvements relating to the recovery of thiocyanatesInfo
- Publication number
- GB877737A GB877737A GB748359A GB748359A GB877737A GB 877737 A GB877737 A GB 877737A GB 748359 A GB748359 A GB 748359A GB 748359 A GB748359 A GB 748359A GB 877737 A GB877737 A GB 877737A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thiocyanate
- liquor
- aqueous waste
- concentration
- distillation
- 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
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/20—Thiocyanic acid; Salts thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Extraction Or Liquid Replacement (AREA)
Abstract
Thiocyanate is recovered from aqueous waste liquor by addition of a mineral acid, e.g. sulphuric acid to the aqueous waste liquor followed by distillation under reduced pressure, the initial concentration of thiocyanate being equivalent to 2-30% w/w sodium thiocyanate, the molar ratio of mineral acid added to thiocyanate in the liquor being from 0.25-3.0 and the distillation pressure being from 1 mm. to 30 mm. of mercury. The aqueous waste liquor may require dilution or concentration to bring the thiocyanate concentration to the desired value and further treatment may be administered between acidification and distillation. Thiocyamic acid may be collected together with water distilled off, or may be collected in suitable alkalis or by other well known means. Examples are given in one of which 99 gms. of liquor are diluted with 225 gms. of water before 16.6 ccs. of 98% sulphuric acid are added thereto. The resulting acidified liquor was distilled at a pressure of 2 cms. of mercury and 99.8% of thiocyanate present was recovered, partly as sodium thiocyanate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB748359A GB877737A (en) | 1959-03-04 | 1959-03-04 | Improvements relating to the recovery of thiocyanates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB748359A GB877737A (en) | 1959-03-04 | 1959-03-04 | Improvements relating to the recovery of thiocyanates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB877737A true GB877737A (en) | 1961-09-20 |
Family
ID=9833988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB748359A Expired GB877737A (en) | 1959-03-04 | 1959-03-04 | Improvements relating to the recovery of thiocyanates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB877737A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4975490A (en) * | 1972-11-24 | 1974-07-22 |
-
1959
- 1959-03-04 GB GB748359A patent/GB877737A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4975490A (en) * | 1972-11-24 | 1974-07-22 |
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