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Aluminium potassium sulfate dodecahydrate

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Aluminium potassium sulfate dodecahydrate Basic information

Product Name:
Aluminium potassium sulfate dodecahydrate
CAS:
7784-24-9
MF:
AlH24KO20S2
MW:
474.39
EINECS:
616-521-7
Mol File:
7784-24-9.mol
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Aluminium potassium sulfate dodecahydrate Chemical Properties

Melting point:
92 °C(lit.)
Density 
1.757 g/mL at 25 °C(lit.)
storage temp. 
Store at RT.
solubility 
H2O: soluble0.5M, clear, colorless
form 
Solid
color 
White
Specific Gravity
1.757
PH
3.0-3.5 (25℃, 50mg/mL in H2O)
Water Solubility 
140 G/L (20 ºC)
Merck 
14,360
Stability:
Stable. Incompatible with steel, aluminium, copper, zinc, bases, strong oxidizing agents.
CAS DataBase Reference
7784-24-9(CAS DataBase Reference)
NIST Chemistry Reference
potassium aluminum sulfate dodecahydrate(7784-24-9)
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Safety Information

Hazard Codes 
Xn,Xi
Risk Statements 
36/38-22-36/37/38-21/22
Safety Statements 
22-24/25-37/39-26-36-20-13-2
WGK Germany 
3
RTECS 
WS5690000
TSCA 
Yes
HS Code 
28332990

MSDS

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Aluminium potassium sulfate dodecahydrate Usage And Synthesis

Chemical Properties

white to colourless crystals

Chemical Properties

Aluminum is the most commonly available element in homes and workplaces. Aluminum is readily available for human ingestion through the use of food additives, antacids, buffered aspirin, astringents, nasal sprays, and antiperspirants; from drinking water; from automobile exhaust and tobacco smoke; and from using aluminum foil, aluminum cookware, cans, ceramics, and fi reworks. Workers who are at risk for toxicity are those in refi neries, foundries and also welders and grinders.

Chemical Properties

The PhEur 6.0 describes potassium alum as a granular powder, or colorless, transparent, crystalline masses. The JP XV describes it as colorless or white crystals or powder. Potassium alum is odorless and has a slightly sweet, strongly astringent taste.

Uses

potassium alum (alum) is a cosmetic astringent.

Uses

Aluminium potassium sulfate dodecahydrate is a white crystal that is soluble in water. It is made by roasting alunite in a furnace and then harvesting the product by crystallization. Aluminium potassium sulfate dodecahydrate was used to harden gelatin emulsions by introduction, by bathing the exposed plates prior to development, or by use in the fixing bath. Mixed with citric or other acids, it was also used as a clearing bath to remove developer stains in negatives.

Uses

Buffer; floccculating reagent.

Definition

ChEBI: A hydrate resulting from the the formal combination of anhydrous potassium aluminium sulfate with 12 mol eq. of water.

Production Methods

Potassium alum is manufactured by treating bauxite with sulfuric acid and then potassium sulfate. Alternatively, aluminum sulfate is reacted with potassium sulfate.

Definition

A group of double salts withthe formula A2SO4.B2(SO4)3.24H2O,where A is a monovalent metal and Ba trivalent metal. The original examplecontains potassium and aluminium(called potash alum orsimply alum); its formula is oftenwritten AlK(SO4)2.12H2O (aluminiumpotassium sulphate-12-water). Ammoniumalum is AlNH4(SO4)2.12H2O,chrome alum is KCr(SO4)2.12H2O, etc.The alums are isomorphous and canbe made by dissolving equivalentamounts of the two salts in waterand recrystallizing.

Health Hazard

Prolonged periods of exposure to aluminum and dust cause symptoms of toxicity that include, but are not limited to, coughing, wheezing, shortness of breath, memory loss, learning diffi culty, loss of coordination, disorientation, mental confusion, colic, heartburn, fl atulence, and headaches. Chronic exposures to alumina dust cause irritation to the eyes,

Pharmaceutical Applications

Potassium alum precipitates proteins and is a powerful astringent. The ability to precipitate proteins is utilized in the manufacture of vaccines, where purified proteins are coprecipitated with and adsorbed onto potassium alum.
Potassium alum is often included in preparations used as mouthwashes or gargles and in dermatological preparations, and it may be used as a topical hemostatic, either as a solid or as a solution. Intravesical instillation of potassium alum, typically as a 1% solution, has been used for hemorrhagic cystitis.

Safety

Potassium alum is often included in preparations used as mouthwashes or gargles and in dermatological preparations.
Large doses of potassium alum act as an irritant and may be corrosive; gum necrosis and gastrointestinal hemorrhage have occurred. Acute encephalopathy has been reported following bladder irrigation with alum solutions in the treatment of bladder hemorrhage. Anecdotal evidence suggests that this practice should be avoided for patients with renal insufficiency.

storage

Store in a cool, dry place in tightly closed containers. Stable under normal temperatures and pressures. When kept for a long time at 60–65°C (or over sulfuric acid) potassium alum dodecahydrate loses water, which is reabsorbed on exposure to air. It becomes anhydrous at about 200°C.

Purification Methods

Crystallise it from weak aqueous H2SO4 (ca 0.5mL/g). Its solubility (%) in H2O is 5.7 (0o), 12.0 (20o) and 136.9 (100o).

Incompatibilities

Potassium alum is incompatible with strong oxidizing agents, aluminum, copper, steel, and zinc. When it is dispensed in powders with phenol, salicylates, or tannic acid, gray or green colors may be developed owing to traces of iron in the alum.

Precautions

Aminocarb decomposes on heating and produces toxic fumes, irritating fumes, and oxides of nitrogen. During handling of aminocarb workers should wear protective clothing, gloves, face shield, breathing protection and avoid open flames.

Regulatory Status

GRAS listed. Included in the FDA Inactive Ingredients Database (vaginal; suppository). Included in medicines licensed in the UK.

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J & K SCIENTIFIC LTD.
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Alfa Aesar
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BeiJing Hwrk Chemicals Limted
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