FIELD: chemistry.
SUBSTANCE: process involves reaction of formaldehyde, sodium sulfide and amino compound. Crystalline ammonium chloride is used as amino compound. Thus the introduction of formaldehyde into reaction mixture is carried out in two stages, at the first stage it is introduced in molar ratio to ammonium chloride of 1:2 and at a temperature of 100°C. In a second step, formaldehyde is introduced in a molar ratio to ammonium chloride of 1:1.5, at a temperature of no higher than 30°C.
EFFECT: increase the yield of said sorbent when it is obtained.
13 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR INTENSIFICATION OF SORPTION OF NOBLE METALS WITH HELP OF NANODISPERSED SORBENT | 2014 |
|
RU2582838C1 |
| METHOD FOR SORPTION EXTRACTION OF RARE-EARTH ELEMENTS IN PRESENCE OF FLUORIDE IONS | 2023 |
|
RU2824510C1 |
| METHOD OF RECOVERING GOLD AND PALLADIUM FROM SOLUTIONS | 1994 |
|
RU2102508C1 |
| METHOD FOR OBTAINING SORBENT FOR RECOVERING SELENIUM, TELLURIUM | 2017 |
|
RU2660148C1 |
| AGENT FOR SUPPRESSING GROWTH OF SULFATE-REDUCING BACTERIA | 1999 |
|
RU2160233C1 |
| METHOD FOR PROCESSING NATURAL PHOSPHATES | 2022 |
|
RU2813490C2 |
| METHOD OF PRODUCING CATALYST FOR SYNTHESIS OF VINYL ACETATE | 2009 |
|
RU2422201C1 |
| AGENT FOR SUPPRESSING GROWTH OF SULFATE-REDUCTION BACTERIA | 2001 |
|
RU2206726C2 |
| METHOD FOR PREPARING 5-ACYLPERHYDRO-1,3,5-DITHIAZINES | 2005 |
|
RU2291150C1 |
| METHOD FOR PRODUCING SORBENT OF RARE-EARTH METALS | 2014 |
|
RU2579133C1 |
