FIELD: chemistry.
SUBSTANCE: method involves the following stages: a) obtaining crude gas containing hydrocyanic acid through hydration of formamide until formamide conversion ≥ 97%, b) washing the crude gas obtained at stage a) with acid if necessary; c) subsequent reaction of crude gas obtained at stage a) or if necessary at stage b) with an aqueous metal hydroxide M(OH)x solution, where M is selected from a group consisting of alkali metals and alkali-earth metals and x depends on oxidation state of M and equals 1 or 2.
EFFECT: method enables obtaining aqueous solutions of cyanides of alkali and alkali-earth metals with less colour index, while avoiding expensive purification stages.
10 cl, 1 tbl, 4 ex
| Title | Year | Author | Number |
|---|---|---|---|
| IMPROVED METHOD OF PRODUCING HYDROCYANIC ACID BY CATALYTIC DEHYDRATION OF GASEOUS FORMAMIDE | 2008 |
|
RU2498940C2 |
| METHOD OF PRODUCING HYDROGEN CYANIDE | 2008 |
|
RU2496717C2 |
| METHOD FOR SYNTHESIS OF ALKYL(METH)ACRYLATES | 2006 |
|
RU2409552C2 |
| METHOD OF PRODUCING TRI-ALKALINE SALTS OF METHYLGLYCINE-N,N-DIACETIC ACID WITH NEGLIGIBLE CONTENT OF BY-PRODUCTS | 2006 |
|
RU2399611C2 |
| METHOD OF CONTINUOUS PREPARATION OF METHIONINE OR SALTS THEREOF | 1993 |
|
RU2116294C1 |
| IMPROVED METHOD OF PRODUCING HYDROGEN CYANIDE BY CATALYTIC DEHYDRATION OF GASEOUS FORMAMIDE WITH DIRECT HEATING | 2009 |
|
RU2510364C2 |
| METHOD OF PREPARING GRANULATED ALKALINE METAL CYANIDE AND ALKALINE METAL CYANIDE GRANULATE PREPARED BY THIS METHOD | 1998 |
|
RU2201895C2 |
| METHOD OF PRODUCING METHACRYLIC ACID | 2012 |
|
RU2602080C2 |
| METHOD OF PRODUCING A MIXTURE OF AN ALKALI METAL SALT OF METHYLGLYCINE DIACETIC ACID AND AN ALKALI METAL SALT OF GLUTAMIC DIACETIC ACID, A MIXTURE OF L- AND D-ENANTIOMERS OF SAID SALTS AND AN AQUEOUS SOLUTION OF SAID MIXTURE FOR PRODUCING DETERGENT COMPOSITIONS FOR WASHING AND CLEANING | 2016 |
|
RU2722803C2 |
| METHOD OF PRODUCING SODIUM CYANIDE | 2016 |
|
RU2706664C2 |
