11138-49-1 Usage
Description
Sodium aluminate, with the chemical formula NaAlO2 or Na2Al2O4, is a white solid that is insoluble in ethanol but soluble in water, resulting in strongly alkaline solutions. It has a melting point of 1800°C and is commonly produced by heating bauxite with sodium carbonate and extracting the residue with water. Alternatively, it can be prepared in the laboratory by adding excess aluminum to hot concentrated sodium hydroxide. In solution, the ion Al(OH)4predominates.
Uses
1. Water Treatment:
Sodium aluminate is used in the treatment of industrial and municipal water supplies, acting as an effective precipitant for soluble phosphate in sewage, particularly in wastewater with low alkalinity.
2. Papermaking Industry:
In the papermaking industry, sodium aluminate is utilized to improve sizing, filler retention, and pitch deposition, enhancing the overall quality of the paper products.
3. Paint and Coatings:
The addition of sodium aluminate to titanium dioxide paint pigment enhances the nonchalking performance of outdoor paints, providing better durability and resistance to weathering.
4. Catalyst Preparation:
Sodium aluminate is widely used in the preparation of alumina-based catalysts. Aluminosilicate can be prepared by impregnating silica gel with alumina obtained from sodium aluminate and aluminum sulfate.
5. Adsorbents and Catalyst Support Materials:
Reaction of sodium aluminate with silica or silicates has produced porous crystalline aluminosilicates, which are useful as adsorbents and catalyst support materials, such as molecular sieves.
6. Zeolite Production:
Sodium aluminate is used in a method for producing zeolite with enhanced Silicon/Aluminum ratios, which can have various applications in industrial processes.
7. General Applications:
Sodium aluminate is also used as a mordant, in effluent treatment, in glass manufacture, and in cleansing compounds due to its strong alkaline properties and ability to form complexes with various substances.
Preparation
Small amounts of sodium aluminate are prepared in the lab by fusion of equimolar quantities of sodium carbonate and aluminum acetate, Al(C2H3O2)3, at 800°C. Other methods involve reaction of sodium hydroxide with amorphous alumina or aluminum metal.Commercial quantities of sodium aluminate are made from hydrated alumina, in the form of aluminum hydroxy oxide, AlO(OH), or aluminum hydroxide, Al(OH)3, a product of the Bayer process which is used to refine bauxite, the principal aluminum ore.Commercial grades of sodium aluminate are obtained by digestion of aluminum trihydroxide in aqueous caustic at atmospheric pressure and near the boiling temperature.
Reactions
Sodium aluminate, NaAlO2, white solid, (1) by reaction of aluminum hydroxide and NaOH solution, (2) by fusion of aluminum oxide and sodium carbonate, the solution reacts with CO2 to form aluminum hydroxide.
Air & Water Reactions
Sodium aluminate will dissolve in water and produce a strong corrosive alkaline solution. May generate heat when water is added.
Reactivity Profile
SODIUM ALUMINATE generates a strong base in water; reacts violently with acids and corrosive to metals. Not compatible with copper, tin, zinc, aluminum, acids, phosphorus, or chlorocarbons.
Hazard
(Solution) Strong irritant to tissue.
Health Hazard
Material is caustic. Irritates skin, eyes, and gastrointestinal tract, causing redness of skin and eyes, burning sensation of mucous membranes.
Fire Hazard
Behavior in Fire: Containers may burst when exposed to heat.
Flammability and Explosibility
Nonflammable
Safety Profile
Moderate irritant to skin, eyes, and mucous membranes. A corrosive substance. When heated to decomposition it emits toxic fumes of NazO.
Potential Exposure
Used in water and waste treatment; papermaking industry; in printing on fabrics; in the manufacture of pigments, milk glass, and soap; hardening building stone; sizing paper; as a water softener.
Shipping
UN2812 Sodium aluminate, solid, Hazard class: 8; Labels: 8-Corrosive material. UN1819 Sodium aluminate, solution, Hazard class: 8; Labels: 8-Corrosive material.
Incompatibilities
The aqueous solution is a strong base. Reacts violently with acid. Incompatible with organic anhydrides; isocyanates, alkylene oxides; epichlorohydrin, aldehydes, alcohols, glycols, caprolactum, chlorocarbons. Corrosive to metals; attacks copper, tin, aluminum, and zinc.
Check Digit Verification of cas no
The CAS Registry Mumber 11138-49-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,1,1,3 and 8 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 11138-49:
(7*1)+(6*1)+(5*1)+(4*3)+(3*8)+(2*4)+(1*9)=71
71 % 10 = 1
So 11138-49-1 is a valid CAS Registry Number.
InChI:InChI=1/2Al.2Na.4O/q2*+3;;;;3*-2/r2Al.Na2O.3O/c;;1-3-2;;;/q2*+3;;3*-2
