FIELD: chemical industry, more particularly preparation of sodium pyrosulfite. SUBSTANCE: method comprises reacting calcined soda with sodium hydrosulfite, treating the resulting sulfite- hydrosulfite suspension with sulfur dioxide to prepare suspension of sodium pyrosulfite and isolate the desired product. Sulfur dioxide, which results from combustion of sulfur in excessive amount of air. The resulting hot sulfur dioxide is first allowed to pass through suspension of sodium pyrosulfite under conditions that allow for complete dehydration of suspension of sodium pyrosulfite. Moistened sulfur dioxide is fed into sulfite-hydrosulfite suspension. Invention makes it possible to simplify process and reduce power consumption. EFFECT: more efficient preparation method. 6 cl, 1 dwg, 3 ex
Title | Year | Author | Number |
---|---|---|---|
METHOD OF PRODUCING ALKALI METAL PYROSULFITE | 0 |
|
SU1268513A1 |
METHOD OF OBTAINING SODIUM PYROSULFITE | 0 |
|
SU1168506A1 |
METHOD OF OBTAINING SODIUM SULFITE | 0 |
|
SU1116005A1 |
0 |
|
SU247269A1 | |
PROCESS FOR PRODUCING SODIUM HYDROSULPHITE | 0 |
|
SU947033A1 |
METHOD OF SO-INTO-SO CONVERSION CATALYST | 1998 |
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CATALYST OF CONVERSION OF SO INTO SO | 2000 |
|
RU2162367C1 |
METHOD OF PURIFYING VANILLIN OBTAINED FROM LIGNIN OXIDATION PRODUCTS | 2012 |
|
RU2494085C1 |
METHOD OF OBTAINING SODIUM SULFITE | 0 |
|
SU1141072A1 |
METHOD OF PREPARING SO INTO SO CONVERSION CATALYST | 1998 |
|
RU2134158C1 |
Authors
Dates
2000-11-27—Published
1999-04-28—Filed