FIELD: chemistry.
SUBSTANCE: invention relates to a method for the preparation of 2,5-dimercapto-1,3,4-thiadiazole, which involves mixing hydrazine hydrate, carbon disulfide and sodium hydroxide to produce a reaction medium containing a salt of 2,5-dimercapto-1,3,4-thiadiazole, followed by adding to the reaction medium a neutralizing component selected from a group containing strong organic or inorganic acids. According to the invention, prior to mixing, sodium hydroxide is cooled to a temperature of no more than 12℃. The hydrazine hydrate is added in an inert gas atmosphere during mixing. Mixing of hydrazine hydrate, carbon disulfide and sodium hydroxide is carried out in the molar ratio 1:2,2-2,4:1,55-1,95. The neutralizing component is a solution of sulfuric acid of 5-85%, or hydrochloric acid of 5-25%, or nitric acid of 5-85%, or acetic acid of 5-85%. Moreover, the reaction with the neutralizing component is carried out at a temperature of 10-60 ºC, and the substance obtained after mixing with the neutralizing component is filtered to obtain the finished product.
EFFECT: technical result is a new method for the preparation of 2,5-dimercapto-1,3,4-thiadiazole with a high yield, which can be used as a part of antifreezes, lubricating and cooling liquid, and in metalworking.
2 cl, 12 ex, 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCING ADDUCTS OF S,S-DIMER OF 2,5-DIMERCAPTO-1,3,4-THIADIAZOLE (bis-DMTD) WITH ESTERS OF α, β-UNSATURATED ACIDS | 2021 |
|
RU2768934C1 |
| METHOD OF PREPARING 2-SUBSTITUTED 1,3,4-THIADIOZOLE-5-THIOLES | 0 |
|
SU588918A3 |
| METHOD FOR ISOLATION XANTHATE OF XANTHATE PRODUCTION MOTHER SOLUTION | 0 |
|
SU1807006A1 |
| 0 |
|
SU560532A3 | |
| KETOLIDE COMPOUNDS | 2011 |
|
RU2601550C2 |
| METHOD OF OBTAINING 1-(5-ALKYL-1,3,4-THIADIAZOLE-2-YL)-1,3-DIALKYLUREAS | 0 |
|
SU649319A3 |
| 0 |
|
SU541435A3 | |
| METHOD OF PRODUCING HETEROCYCLIC COMPOUNDS OR PHARMACEUTICALLY ACCEPTABLE SALTS OF ALKALI METALS THEREOF | 0 |
|
SU1454249A3 |
| 5-CHLORODIFLUOROMETHYL-1,3,4-THIADIAZOLE-2-YL-OXYACETANILIDES AND HERBICIDE AGENT BASED ON THEREOF | 2000 |
|
RU2245333C2 |
| METHOD OF PRODUCING CATIONIC CORN STARCH | 2010 |
|
RU2430928C1 |
