AMMONIUM SULFITE
ammonium sulfite
CAS: 10196-04-0
Molecular Formula: H8N2O3S
AMMONIUM SULFITE - Names and Identifiers
| Name | ammonium sulfite |
| Synonyms | ammoniumsulphite ammonium sulfite AMMONIUM SULFITE diammoniumsulfite diazanium,sulfite AMMONIUM SULFITE H2O solid Ammonium Sulfite Sulfurousacid,diammoniumsalt |
| CAS | 10196-04-0 |
| EINECS | 233-484-9 |
| InChI | InChI=1S/2H3N.H2O3S/c;;1-4(2)3/h2*1H3;(H2,1,2,3) |
AMMONIUM SULFITE - Physico-chemical Properties
| Molecular Formula | H8N2O3S |
| Molar Mass | 116.14 |
| Density | 1.41（25℃） |
| Melting Point | 60°C |
| Water Solubility | 642g/L at 25℃ |
| Appearance | solid (rough estimate) |
| Storage Condition | Room Temprature |
| Stability | Stable. Efflorescent. Incompatible with acids, strong oxidizing agents. |
| Physical and Chemical Properties | Colorless monoclinic crystal. Soluble in water, its aqueous solution is alkaline. Slightly soluble in alcohol. Insoluble in acetone and carbon disulfide. |
AMMONIUM SULFITE - Nature
Open Data Verified Data
colorless crystals. Deliquescence. In air or by heating, the water of lost crystallization is gradually changed to (NH4)2S04. Soluble in water, almost insoluble in ethanol, acetone.
Last Update：2024-01-02 23:10:35
AMMONIUM SULFITE - Preparation Method
Open Data Verified Data
Industrial production is generally water or mother liquor or ammonia absorption of sulfur dioxide in sulfuric acid tail gas or sulfur dioxide in the flue gas to produce ammonium bisulfite, and then add ammonia or ammonium bicarbonate neutralization reaction.
Ammonia method: ammonia is prepared into a solution of a certain specific gravity and alkalinity, and sulfur dioxide in sulfuric acid tail gas or sulfur-burning flue gas is circulating absorbed to prepare ammonium bisulfite solution. When the absorption liquid phase has a density of 1. 30~1. 32 into the neutralizer, and then add ammonia neutralization reaction to the end, after centrifugal separation, drying, prepared ammonium sulfite product.
Ammonium bicarbonate method: using mother liquor or ammonia absorption solution to absorb sulfur dioxide in sulfuric acid tail gas to prepare ammonium bisulfite solution, when the absorption liquid phase density reaches 1. 30~1. 32 into the neutralizer, and then add ammonium bicarbonate neutralization reaction to the end, after centrifugal separation, drying, prepared ammonium sulfite product.
Last Update：2022-01-01 09:00:44
AMMONIUM SULFITE - Use
Open Data Verified Data
It can be used as an efficient absorbent for removing a small amount of hydrogen sulfide from coal gas, and can be used in medicine, photographic reducing agent, dye intermediate, paper making, food additive, water treatment, etc.
Last Update：2022-01-01 09:00:44
AMMONIUM SULFITE - Safety
Open Data Verified Data
- can stimulate the nose, throat, bronchi, skin and eyes. Inhalation of dust can stimulate the lungs, leading to allergic asthma, symptoms of Cough, shortness of breath, wheezing, severe allergies can be fatal. Water spray or the use of dry powder, carbon dioxide, foam extinguishing agent.
- packed in woven bags lined with polyethylene plastic bags, each with a net weight of 50kg. The inner bag is sealed with a string or a heat seal. Should be stored in a cool, dry warehouse. Because this product is easy to oxidation, moisture, so the storage time should not be too long. Transportation should be protected from rain and sun exposure. Handling should be careful to prevent damage to the package.
Last Update：2022-01-01 09:00:45
AMMONIUM SULFITE - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| overview | ammonium sulfite is colorless crystal and easy to deliquesce. Easily soluble in water, its aqueous solution is weakly alkaline, slightly soluble in ethanol, and hardly soluble in acetone. It is easily oxidized to ammonium sulfate in the air. When heated, it can be decomposed into ammonia and sulfur dioxide. Preparation method: The tail gas in sulfuric acid can be absorbed with water, and then reacted with ammonium bicarbonate, separated and dried. The reaction formula is as follows: ammonium sulfite content of industrial products: grade I products ≥ 85%, grade II products ≥ 80%. Mainly used in the papermaking industry of ammonium pulping and papermaking, can also be used in the laboratory to produce sulfur dioxide, photosensitive, chemical industry, printing and dyeing industry reducing agent and curling water raw materials and production of chemical intermediates, etc., can also be used as chemical fertilizer for agricultural production. This product can be packed in plastic bags and woven bags for external use. It should be stored in a cool and dry warehouse to prevent oxidation and moisture. The storage time should not be too long. This product was first produced in Shandong Tai'an Paper Mill, which carried out ammonium sulfite pulping test in 1967. Pyrite or sulfur was burned to produce sulfur dioxide gas, and ammonia water was absorbed to produce liquid ammonium sulfite. In 1971, Xinxiang County Chemical Plant cooperated with the Institute of Plant Protection of the Chinese Academy of Agricultural Sciences to burn sulfur in the ammonium sulfite workshop of the plant, absorb with ammonia water, neutralize with gas and ammonia, and successfully produce solid ammonium sulfite for Xinxiang County Hongqi Paper Mill pulp and paper making. At the same time, a field experiment was carried out on ammonium sulfite as a chemical fertilizer, which proved that ammonium sulfite can be used as a chemical fertilizer, and the fertilizer efficiency is similar to that of ammonium sulfate. In 1976, Beijing Changping County Chemical Fertilizer Plant cooperated with Nanjing Chemical Industry Company Research Institute and other units to carry out ammonia treatment of sulfuric acid tail gas and ammonium bicarbonate neutralization to produce solid ammonium sulfite. The experiment was successful. At the same time, the chlorination and oxidation resistance of solid ammonium sulfite were tested, which provided a scientific basis for its production, packaging and storage, and laid a foundation for industrial production. In 1979, Sichuan Yinshan Phosphate Fertilizer Factory treated sulfuric acid tail gas by ammonia method, and 20%-22% ammonia water was used to directly neutralize and produce solid ammonium sulfite. In 1983, the ammonia method of Kaifeng Chemical Fertilizer Plant to treat sulfuric acid tail gas began to use gas ammonia as an ammonia source to produce solid ammonium nitrite. At present, the manufacturing industry of this product has begun to take shape. |
| use | used as a high-efficiency absorbent to remove a small amount of hydrogen sulfide in gas, and can be used in medicine, photographic reducing agent, dye intermediate, etc. used as reducing agent |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 15:16:46
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