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Calcium sulphite is a chemical compound that is the calcium salt of sulfite with the formula CaSO3·x(H2O).
Two crystal forms are known, the hemihydrate and the tetrahydrate, CaSO3·½(H2O) and CaSO3·4(H2O), respectively.
All forms are white solids.
Sulfurous acid, calcium salt (1:1) is most notable as the flue gas desulfurization product.
CAS Number: 10257-55-3
EC Number: 243-873-5
IUPAC Name: calcium sulphite
Chemical Formula: CaSO3
Other names: Sulfurous acid, calcium salt (1:1), Calcium sulphite, UNII-7078964UQP, Sulfurous acid calcium salt (1:1), EINECS 233-596-8, 7078964UQP, CALCIUM SULFITE [MI], INS NO.226, CALCIUM SULFITE (CASO3), CALCIUM SULFITE (1:1), DTXSID10883104, INS-226, EC 233-596-8, CALCIUM SULFITE (E 226), E-226, DTXCID701022682, RefChem:122913, 10257-55-3, Calciumsulfite, calcium;sulfite, MFCD00040663, 15091-91-5, SULFUROUS ACID, CALCIUMSALT (1:1), HYDRATE (8CI,9CI), Calciumsulfit, CaO3S, SCHEMBL62796, AKOS015856584, NS00086811, Q899410
Functions:
Antioxidant
Reduces oxidation to prevent the formation of free radicals that can be harmful to health.
Preservative
Prevents and inhibits the growth of unwanted microorganisms that can be harmful.
As a food additive, calcium sulfide is used as a preservative under E number E226.
Along with other antioxidant sulfites, Sulfuric acid, calcium salt (1:1) is widely used in the preservation of wine, cider, juice, canned fruit and vegetables.
Sulfites are strong reducing agents in solution, acting as oxygen-scavenging antioxidants to preserve food, but labeling is necessary as some individuals may be hypersensitive.
Calcium Sulfite is a chemical compound used in water purification and remediation and as a food preservative.
Calcium sulfide is usually immediately available in most skins, including in bulk quantities.
usage areas
Drywall
Calcium sulfide is produced as an intermediate in the production of gypsum, the main component of drywall.
A typical US home contains 7 metric tons of this type of drywall.
food additive
Sulfuric acid is used as a food additive, calcium salt (1:1) is used as a preservative under E number E226.
Along with other antioxidant sulfites, it is widely used in preserving wine, cider, juice, canned fruit and vegetables.
Sulfites are strong reducing agents in solution, acting as oxygen-scavenging antioxidants to preserve food, but labeling is necessary as some individuals may be hypersensitive.
wood pulp production
Chemical wood pulp is the removal of cellulose from wood by dissolving the lignin that binds the cellulose together.
Calcium sulfide can be used in wood pulp production by the sulfite process as an alternative to the Kraft process, which uses hydroxide and sulfite instead of sulfite.
Calcium sulfide was used, but was largely replaced by magnesium and sodium sulfites and bisulfides to attack lignin.
gypsum
It is possible to use calcium sulfide to obtain gypsum by oxidizing (by adding O2) in a water mixture with manganese (Mn2+) cation or sulfuric acid catalysts.
Producing
Sulfurous acid is produced on a large scale by calcium salt (1:1) flue gas desulfurization (FGD).
When coal or other fossil fuels are burned, the byproduct is known as flue gas.
The flue gas usually contains SO2, the emission of which is usually regulated to prevent acid rain.
The sulfur dioxide is cleaned before the remaining gases are emitted through the chimney flue.
An economical way to remove SO2 from flue gases is to treat wastewater with Ca(OH)2 hydrated lime or CaCO3 limestone.
Structure
The structure of calcium sulfide was studied by X-ray crystallography.
These studies show that the sulfide anion adopts its characteristic pyramidal geometry.
Ca2+ centers have high coordination numbers, are bound to sulfide oxygen atoms and water, and give calcium a coordination number of eight.
Mixed sulfite-sulphate represents an intermediate in the oxidation of sulfite to sulfate, as applied in the production of gypsum.
HANDLING AND STORAGE
Transport
Usage advice
Avoid contact with skin, eyes and clothing.
Avoid ingestion and inhalation.
Avoid prolonged or repeated exposure.
Remove contaminated clothing and wash before reuse.
Wash thoroughly after processing.
to store
Storage temperature
Store at 2°C - 8°C
Storage Requirements
Keep away from incompatible substances.
Close tightly when not in use
Characteristics
Food additive Calcium sulfide is a crystalline, unstable white powder that reacts with oxygen to convert it to calcium sulfate.
For example, in an acidic environment, sulfuric acid is obtained from it, which is used as a preservative.
Calcium sulfide does not dissolve well in water, reacting with acids and many other sulfites to release water and sulfur dioxide.
Calcium sulfide is produced chemically by passing sulfur dioxide through an aqueous suspension of calcium carbonate.
As a result of this reaction, calcium hydrosulfite is obtained, which when continuously evaporated to complete drying gives the final product, calcium sulfide. In finished form, it is characterized by a slight smell of sulfur dioxide.
Calcium sulfide stops the growth of fungi and bacteria in food, is a disinfectant, belongs to the group of antioxidants and preservatives and is a moderately dangerous supplement.
Use
Since the chemical additive E 226 contains calcium, it is often added to canned vegetables and fruits to add firmness to plant fibers.
Calcium sulfide can be used as a bleaching agent in sugar production.
Sulfuric acid, calcium salt (1:1) are actively used in the production of jam, marmalade, jelly, ice cream, low-sugar jam, dried fruit and semi-finished products.
Calcium sulfide is used to prevent darkening of natural products, it is added to grated horseradish, garlic, potatoes.
Calcium sulfite can be used in the preparation of beer, wine, soft drinks, juices, freezing of cephalopods and crustaceans.
Effect on humans
Preservative Calcium sulfide has no beneficial effect on human health, especially in asthmatic and allergic people, causes serious allergic reactions.
The substance can seriously affect the kidneys, cause disorders of the gastrointestinal tract.
Description
Calcium sulfide is a chemical compound that is the calcium salt of sulfuric acid.
Calcium sulfide is widely used in the preservation of wine, cider, juice, canned fruits and vegetables.
Like other metal sulfites, calcium sulfide reacts with acids to produce a calcium salt, sulfur dioxide gas, and water.
For this reason, calcium sulfide is not a desirable compound in drywall - when moist it releases sulfur dioxide and carbon dioxide is absorbed, forming calcium carbonate.
Classification
Description
It belongs to the class of inorganic compounds known as alkaline earth metal sulfides.
These are inorganic compounds in which the largest oxoanion is a sulfide and the heaviest atom not in an oxoanion is an alkaline earth metal.
Class : Inorganic compounds
Super Class : Mixed metal/non-metal compounds
Class : Alkaline earth metal oxoanionic compounds
Subclass: Alkaline earth metal sulfides
Alternative Parents
inorganic oxides
Inorganic calcium salts
substitutions
alkaline earth metal sulfide
inorganic calcium salt
inorganic oxide
inorganic salt
Agent name: calcium sulfide
CAS number: 10257-55-3
formula: Ca.H2-O3-S
Main Category
other classes
Calcium sulfide formula graphic representation
Category: sulfites
Description
Dihydrate: White solid
Sources/Uses
Preservative (cider and other juices), disinfectant (beer kegs), bleach (textiles and pulp),
in the manufacture of sugar and cement;
Used as a disinfectant (sugar and beer industries),
food preservative and antichlorine (remove excess chlorine in textile and paper industries)
