GB442528A - Improvements in or relating to the manufacture of alkali metal cyanides - Google Patents
Improvements in or relating to the manufacture of alkali metal cyanidesInfo
- Publication number
- GB442528A GB442528A GB22975/34A GB2297534A GB442528A GB 442528 A GB442528 A GB 442528A GB 22975/34 A GB22975/34 A GB 22975/34A GB 2297534 A GB2297534 A GB 2297534A GB 442528 A GB442528 A GB 442528A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carbonate
- passed
- gases
- alkali metal
- water vapour
- 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
- C01C3/08—Simple or complex cyanides of metals
- C01C3/10—Simple alkali metal cyanides
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
Abstract
Alkali metal cyanides are obtained by reacting hydrogen cyanide or ammonium cyanide with an anhydrous alkali metal carbonate at elevated temperature, treating the resulting gaseous mixture to remove water vapour and/or carbon dioxide and preferably also ammonia, and either reintroducing the gases resulting from such treatment into the reaction zone or bringing them into contact with a fresh quantity of anhydrous alkali metal carbonate at elevated temperature. According to a modification, formamide is employed as a starting material, ammonia as well as water vapour and/or carbon dioxide being removed from the resulting gases before their further treatment. Temperatures of 200--500 DEG C. may be employed. If desired, a plurality of carbonate containing reaction vessels connected in series may be used, the gases being passed through the entire series with intervening removal of water vapour and/or carbon dioxide. When the carbonate in the first reaction vessel has been sufficiently converted into cyanide, the hydrocyanic acid gas may be led directly into the second vessel while the exit gases from the last reaction vessel after dehydration are passed into a fresh charge of carbonate. According to an example, formamide vapour and nitrogen are passed through finely divided anhydrous sodium carbonate at 415--435 DEG C. The ammonia is removed from the exit gases by means of dilute sulphuric acid and the water vapour by means of calcium chloride, the exit gases from the calcium chloride tube containing hydrocyanic acid being passed through a second reaction vessel containing finely divided anhydrous sodium carbonate heated to 445--455 DEG C. The exit gases from the second reaction vessel are passed through sodium hydroxide solution to absorb residual hydrocyanic acid.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US442528XA | 1933-08-08 | 1933-08-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB442528A true GB442528A (en) | 1936-02-10 |
Family
ID=21931338
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB22975/34A Expired GB442528A (en) | 1933-08-08 | 1934-08-08 | Improvements in or relating to the manufacture of alkali metal cyanides |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB442528A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111484039A (en) * | 2020-03-24 | 2020-08-04 | 营口德瑞化工有限公司 | Method for removing sodium/potassium carbonate and sodium/potassium hydroxide in sodium cyanide/potassium solution |
-
1934
- 1934-08-08 GB GB22975/34A patent/GB442528A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111484039A (en) * | 2020-03-24 | 2020-08-04 | 营口德瑞化工有限公司 | Method for removing sodium/potassium carbonate and sodium/potassium hydroxide in sodium cyanide/potassium solution |
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