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Sodium aluminum sulfate is a white, free-flowing powdered material that occurs as colorless crystals.
Sodium Aluminum Sulfate is a leavening acid used in baking powders; prepared institutional and retail cake, cookie, and biscuit mixes; muffins; self-rising flour and baking mixes.
Sodium Aluminum Sulfate, also known as sodium alum, a type of alum that is used in baking powder with the European food additive number E521.
CAS Number: 10102-71-3
Molecular Formula: AlNaO8S2
Molecular Weight: 242.1
EINECS Number: 233-277-3
Synonyms: Aluminum Sodium Sulfate, Sodium aluminum sulfate, Soda alum, Aluminum sodium disulfate, Sodium aluminium sulfate, Sulfuric acid, aluminum sodium salt (2:1:1), Aluminum sodium sulphate, UNII-0CM6A697VV, Aluminium sodium bis(sulphate), Aluminum sodium sulfate (AlNa(SO4)2), XUANMINGFEN, 0CM6A697VV, HSDB 571, EINECS 233-277-3, Aluminum sodium sulfate, NaAl(SO4)2, Sodium aluminum sulfate (NaAl(SO4)2), SODIUM ALUM ANHYDROUS, ALUMINIUM SODIUM SULFATE, INS NO.521, NATRII SULFAS EXSICCATUS, SODIUM ALUMINUM SULPHATE, EXSICCATED SODIUM SULFATE, INS-521, ALUMINIUM SODIUM BIS(SULFATE), ALUMINUM SODIUM SULFATE [MI], ALUMINUM SODIUM SULFATE [FCC], ALUMINUM SODIUM SULFATE [HSDB], NATRII SULFAS EXSICCATUS [CHP], ALUMINUM SODIUM SULFATE ANHYDROUS, ALUMINIUM SODIUM SULFATE ANHYDROUS, ALUMINUM SODIUM SULPHATE ANHYDROUS, ALUMINIUM SODIUM SULFATE, ANHYDROUS, E-521, ALUMINUM SODIUM SULFATE (NaAl(SO4)2), SULFURIC ACID, ALUMINIUM SODIUM SALT (2:1:1), Sodium alum, anhydrous, Aluminum sodium sulfic acid, Aluminum sodium sulphic acid, DTXCID901030895, aluminium(3+) ion sodium disulfate, 233-277-3, DTXSID60890626, RefChem:111696, 10102-71-3, aluminum;sodium;disulfate, SCHEMBL62673, NS00082581, Q413559., ALUMINUM SODIUM SULFATE, ALUMINUMSODIUMSULFATE, REAGENT, ALUMINIUMSODIUMSULPHATE, SODIUMALUMINIUMSULPHATE, Sulfuric acid, aluminum sodium salt;sodium aluminium sulfate for food：sodium alum for food, SODIUM ALUM, SODIUM ALUMINUM SULFATE
Sodium Aluminum Sulfate is the inorganic compound with the chemical formula NaAl(SO4)2·12H2O (sometimes written Na2SO4·Al2(SO4)3·24H2O).
Also known as soda alum, sodium alum, or SAS, this white solid is used in the manufacture of baking powder and as a food additive.
Sodium Aluminum Sulfates official mineral name is alum-Na (IMA symbol: Aum-Na).
Sodium aluminum sulfate, often written as NaAl(SO₄)₂, is an inorganic double salt that is formed by the combination of sodium sulfate and aluminum sulfate, and it belongs to the family of compounds commonly referred to as alums.
Sodium Aluminum Sulfate is made up of sodium ions (Na⁺), aluminum ions (Al³⁺), and sulfate anions (SO₄²⁻), arranged in a crystalline structure that can exist in both anhydrous and hydrated forms, depending on how much water is bound in the crystal lattice.
In its solid state, sodium aluminum sulfate usually appears as a white crystalline powder or granular solid that is odorless and stable under normal conditions, and it has a distinctly astringent, acidic taste.
From an industrial perspective, Sodium Aluminum Sulfate is widely used in the food industry, particularly as a leavening acid in commercial baking powders, where it reacts slowly with sodium bicarbonate (baking soda) to release carbon dioxide gas during baking, which helps doughs and batters rise and develop a light, fluffy texture.
Because it reacts more slowly than other leavening acids, it is classified as a slow-acting leavening agent, which allows baked products such as cakes, muffins, and biscuits to rise steadily during baking instead of all at once during mixing.
This controlled release of gas makes it valuable for mass-produced baked goods, where consistency and shelf stability are important.
Sodium Aluminum Sulfates primary uses are in bakery and its purpose is as a slow-acting leavening acid in baking powder.
Sodium Aluminum Sulfate is a salt with the formula Al2(SO4)3.
It is soluble in water and is mainly used as a coagulating agent (promoting particle collision by neutralizing charge) in the purification of drinking water and wastewater treatment plants, and also in paper manufacturing.
The anhydrous form occurs naturally as a rare mineral millosevichite, found for example in volcanic environments and on burning coal-mining waste dumps.
Sodium Aluminum Sulfate is rarely, if ever, encountered as the anhydrous salt.
It forms a number of different hydrates, of which the hexadecahydrate Al2(SO4)3·16H2O and octadecahydrate Al2(SO4)3·18H2O are the most common.
The heptadecahydrate, whose formula can be written as [Al(H2O)6]2(SO4)3·5H2O, occurs naturally as the mineral alunogen.
Sodium Aluminum Sulfate is sometimes called alum or papermaker's alum in certain industries.
However, the name "alum" is more commonly and properly used for any double sulfate salt with the generic formula XAl(SO4)2·12H2O, where X is a monovalent cation such as potassium or ammonium.
Like its potassium analog, sodium aluminum sulfate crystallizes as the dodecahydrate in the classical cubic alum structure.
Sodium Aluminum Sulfate is very soluble in water, and is extremely difficult to purify.
In the preparation of this salt, it is preferable to mix the component solutions in the cold, and to evaporate them at a temperature not exceeding 60 °C. 100 parts of water dissolve 110 parts of sodium alum at 0 °C, and 51 parts at 16 °C.
Sodium Aluminum Sulfate appears as a colorless crystalline solid. Used in textiles, paper making, water purification, food processing.
Sodium Aluminum Sulfate is the inorganic compound with the chemical formula.
Sodium Aluminum Sulfate is used in the manufacture of baking powder and as a food additive.
Sodium Aluminum Sulfates official mineral name is alum-Na.
Sodium Aluminum Sulfate is produced by combining sodium sulfate and aluminium sulfate.
Sodium Aluminum Sulfate is known in mineralogy as alum-(Na).
Sodium Aluminum Sulfate is a white, free-flowing powdered material that occurs as colorless crystals.
Sodium Aluminum Sulfate is a leavening acid used in baking powders; prepared institutional and retail cake, cookie, and biscuit mixes; muffins; self-rising flour and baking mixes.
Sodium Aluminum Sulfate is commonly used in combination with monocalcium phosphate in double-acting baking powders.
Sodium Aluminum Sulfate does not react with baking soda until it is-above 140 oF.2
Sodium Aluminum Sulfate will impart a light milk chocolate color to the crumb.
Sodium Aluminum Sulfate-based baking powders release gas quickly when the muffin is deposited onto a hot griddle which creates the desired large gas holes.
Sodium Aluminum Sulfate promotes blistering which imparts a tender texture to the tortilla.
Sodium Aluminum Sulfate is unfortunately high in sodium.
Sodium Aluminum Sulfate is produced by the reaction of sodium sulfate and aluminum sulfate.
Sodium Aluminum Sulfate should be used in conjunction with baking soda.
Sodium aluminum sulfate is produced by combining sodium sulfate and aluminium sulfate.
An estimated 3000 ton/y (2003) are produced worldwide.
The dodecahydrate is known in mineralogy as alum-(Na).
Two other rare mineral forms are known: mendozite (undecahydrate)[7] and tamarugite (hexahydrate).
Melting point: ~60 °C [MER06]
Density: 1.610
Refractive index: 1.4388
Solubility: Insoluble in ethanol
Form: Colorless crystals
Color: Colorless crystals, crystalline
Water Solubility: 37.4 g/100 g H2O (0 °C), 39.7 g/100 g H2O (20 °C), 43.8 g/100 g H2O (40 °C) [LAN05]; insoluble in alcohol [MER06]
InChI: InChI=1S/Al.Na.2H2O4S/c;;2*1-5(2,3)4/h;;2*(H2,1,2,3,4)/q+3;+1;;/p-4
InChIKey: GJPYYNMJTJNYTO-UHFFFAOYSA-J
SMILES: S([O-])(=O)(=O)[O-].S([O-])([O-])(=O)=O.[Al+3].[Na+]
LogP: -1.031 (est)
Sodium Aluminum Sulfate is a general purpose food additive that functions as a buffer, neutralizing agent, and firming agent.
Sodium Aluminum Sulfate is anhydrous and slowly soluble in water. The dodecahydrate form is readily soluble in water.
Sodium Aluminum Sulfate is also termed soda alum.
Sodium Aluminum Sulfate is a leavening agent that releases the majority of the gas during baking, and is not used alone but in combination with a faster-acting leavening agent such as monocalcium phosphate.
Sodium Aluminum Sulfate is almost nonreactive until heat is applied.
Sodium Aluminum Sulfate is used in baked goods.
Sodium Aluminum Sulfate is a slow-acting, heat-activated leavening acid.
Sodium Aluminum Sulfate reacts too slowly to give good oven spring during baking so it not widely used.
Sodium Aluminum Sulfate has no reaction at room temperature and so is not used alone, but is used often in combination with MCP.
Sodium Aluminum Sulfate has a weakening effect on the crumb texture and a slightly astringent or metallic aftertaste.
Sodium Aluminum Sulfate is most commonly used as the slow-acting leavening acid in double-acting household-use baking powder.
Sodium Aluminum Sulfate is necessary to know its uses, which include firefighting foam, sewage treatment, water purification, and paper production.
Sodium Aluminum Sulfate is a leavening acid commonly found in baked goods.
Aluminum sodium sulfate has a neutralizing value of 104 and very slow reaction rate.
The neutralizing value of leavening acids is the ratio of sodium bicarbonate (baking soda) to 100 parts of acid leavener that will bring about complete carbon dioxide release or “neutralization.”
Adjusting the amount of leavening acid to baking soda can raise (decrease acid amount) or lower (increase the acid amount) the pH of the finished product, if desired.
When applying Sodium Aluminum Sulfate as the leavening acid, the acid-to-base ratio has an important effect on final product quality.
Research found that when preparing tortilla, the acid-to-base ratio influences the opacity, pH, rollability, shelf-stability, specific volume, extensibility of the final product.
Aluminum Sodium Sulfate is generally immediately available in most volumes.
High purity, submicron and nanopowder forms may be considered.
Sulfate compounds are salts or esters of sulfuric acid formed by replacing one or both of the hydrogens with a metal.
Most metal sulfate compounds are readily soluble in water for uses such as water treatment, unlike fluorides and oxides which tend to be insoluble.
Organometallic forms are soluble in organic solutions and sometimes in both aqueous and organic solutions.
Metallic ions can also be dispersed utilizing suspended or coated nanoparticles and deposited utilizing sputtering targets and evaporation materials for uses such as solar cells and fuel cells.
From a chemical and regulatory perspective, sodium aluminum sulfate is considered generally recognized as safe (GRAS) in small amounts for food use by authorities such as the U.S. Food and Drug Administration, but its use has been reduced in some regions due to public concerns about the dietary intake of aluminum compounds.
Excessive consumption of aluminum salts over time has been associated with potential health concerns, including gastrointestinal irritation and possible contributions to neurological conditions, although scientific evidence remains debated.
Sodium Aluminum Sulfate is very soluble in water, and is extremely difficult to purify.
In the preparation of this salt, Sodium alum is preferable to mix the component solutions in the cold, and to evaporate them at a temperature not exceeding 60 °C.
100 parts of water dissolve 110 parts of sodium alum at 0 °C, and 51 parts at 16 °C.
Uses:
Sodium Aluminum Sulfate is a leavening agent that releases the majority of the gas during baking, and is not used alone but in com- bination with a faster-acting leavening agent such as monocalcium phosphate. this results in a double-acting baking powder.
Sodium Aluminum Sulfate is almost nonreactive until heat is applied.
Sodium Aluminum Sulfate is used in baked goods.
Aluminum Sodium Sulfate is a general purpose food additive that functions as a buffer, neutralizing agent, and firming agent.
It is anhydrous and slowly soluble in water, the dodecahydrate form is readily soluble in water.
Sodium Aluminum Sulfate is also termed soda alum.
Sodium Aluminum Sulfate is also used as an acidity regulator in food, with E number E521.
Sodium Aluminum Sulfate is also a common mordant for the preparation of hematoxylin solutions for staining cell nuclei in histopathology.
Sodium Aluminum Sulfate is also used as a flocculant in water treatment and disinfection, but its relatively crude, caustic action makes it more suitable for industrial applications.
The list of uses of Sodium Aluminum Sulfate is very long and includes bug killers for the garden, adding bulk to paper sheets in paper manufacturing, and a foaming agent in fire extinguishers.
Water purification plants depend on Sodium Aluminum Sulfate to remove impurities.
The chemical reaction between it and contaminates causes the contaminates to solidify and be filtered out.
In the US, some brands combine sodium aluminum sulfate with sodium bicarbonate and monocalcium phosphate in formulations of double acting baking powder.
Sodium Aluminum Sulfate is also used as an acidity regulator in food, with E number E521.
Sodium Aluminum Sulfate is also a common mordant for the preparation of hematoxylin solutions for staining cell nuclei in histopathology.
Sodium Aluminum Sulfate is also used as a flocculant in water treatment and disinfection, but its relatively crude, caustic action makes it more suitable for industrial applications.
Sodium Aluminum Sulfate is sometimes used in the human food industry as a firming agent, where it takes on E number E520, and in animal feed as a bactericide.
In the United States, the FDA lists it as "generally recognized as safe" with no limit on concentration.
Sodium Aluminum Sulfate may be used as a deodorant, an astringent, or as a styptic for superficial shaving wounds.
Sodium Aluminum Sulfate is used as a mordant in dyeing and printing textiles.
It is a common vaccine adjuvant and works "by facilitating the slow release of antigen from the vaccine depot formed at the site of inoculation."
Sodium Aluminum Sulfate is used in water purification and for chemical phosphorus removal from wastewater.
It causes suspended impurities to coagulate into larger particles and then settle to the bottom of the container (or be filtered out) more easily. This process is called coagulation or flocculation.
Research suggests that in Australia, aluminium sulfate used in this way in drinking water treatment is the primary source of hydrogen sulfide gas in sanitary sewer systems.
An improper and excess application incident in 1988 polluted the water supply of Camelford in Cornwall.
Sodium Aluminum Sulfate has been used as a method of eutrophication remediation for shallow lakes.
It works by reducing the phosphorus load in the lakes.
When dissolved in a large amount of neutral or slightly alkaline water, aluminium sulfate produces a gelatinous precipitate of aluminium hydroxide, Al(OH)3.
In dyeing and printing cloth, the gelatinous precipitate helps the dye adhere to the clothing fibers by rendering the pigment insoluble.
Aluminium sulfate is sometimes used to reduce the pH of garden soil, as it hydrolyzes to form the aluminium hydroxide precipitate and a dilute sulfuric acid solution.
An example of what changing the pH level of soil can do to plants is visible when looking at Hydrangea macrophylla.
The gardener can add aluminium sulfate to the soil to reduce the pH which in turn will result in the flowers of the Hydrangea turning a different color (blue).
The aluminium is what makes the flowers blue; at a higher pH, the aluminium is not available to the plant.
Health Hazard:
Inhalation of material may be harmful, contact may cause burns to skin and eyes.
Inhalation of Asbestos dust may have a damaging effect on the lungs.
Fire may produce irritating, corrosive and/or toxic gases.
Some liquids produce vapors that may cause dizziness or suffocation.
Runoff from fire control may cause pollution.
Safety Profile:
A weak sensitizer, a general-purpose food addtive.
Local contact may cause contact dermatitis when heated to decomposition it emits toxic fumes of SO, and Na2O.
Sodium aluminum sulfate is considered relatively safe for use in small, regulated amounts in food products, where it functions primarily as a leavening acid, but when handled in larger quantities, as in industrial settings, it can present certain health and environmental hazards.
Unlike highly corrosive mineral acids, it is not acutely toxic in small exposures, but it can still cause irritation to the skin, eyes, and respiratory system if people come into direct contact with its concentrated crystalline or powdered form.
In its powdered state, sodium aluminum sulfate can generate fine dust particles that may be inhaled if proper ventilation or dust control is not maintained.
Inhalation of this dust may lead to respiratory tract irritation, throat dryness, coughing, or sneezing, and prolonged or repeated occupational exposure could cause more persistent symptoms such as mild bronchial irritation.
Although it is not classified as a strong respiratory sensitizer, workers in food manufacturing or chemical processing plants are advised to use protective masks or respirators to avoid inhaling airborne dust particles.
