7784-31-8

Basic information

• Product Name: Aluminium sulfate octadecahydrate
• Synonyms: Aluminiumsulfate,octadecahyd;aluminiumsulfateocatadecahydrate;aluminiumsulphateocatadecahydrate;aluminumsulfate(non-specificname);aluminumsulphateocatadecahydrate;cakealumoctadecahydrate;dialuminumsulfateoctadecahydrate;Sulfuricacid,aluminumsalt(3:2),octadecahydrate
• CAS NO: 7784-31-8
• Molecular Formula: Al2H36O30S3
• Molecular Weight: 666.43
• EINECS: 233-135-0
• Product Categories: ACS GradeChemical Synthesis;Aluminum;Catalysis and Inorganic Chemistry;Essential Chemicals;Routine Reagents;metal sulfate
• Mol File: 7784-31-8.mol
• Article Data: 0

Chemical Properties

• Melting Point: 86 °C
• Boiling Point: 330oC at 760 mmHg
• Appearance: White/Powder/Solid
• Density: 1,69 g/cm3
• Vapor Pressure: 3.35E-05mmHg at 25°C
• Storage Temp.: Store at room temperature.
• Solubility: 364g/l
• Water Solubility: Soluble
• Sensitive: moisture sensitive
• CAS DataBase Reference: Aluminium sulfate octadecahydrate(CAS DataBase Reference)
• NIST Chemistry Reference: Aluminium sulfate octadecahydrate(7784-31-8)
• EPA Substance Registry System: Aluminium sulfate octadecahydrate(7784-31-8)

Safety Data

• Hazard Codes: N-Xn,Xi,N,Xn
• Statements: 51/53-41-36/37/38-22
• Safety Statements: 61-37/39-29-26-39
• RIDADR: UN3260 - class 8 - PG 3 - RQ - Corrosive solid, acidic, inorgani
• WGK Germany: 1
• RTECS: WS5697000
• Hazardous Substances Data: 7784-31-8(Hazardous Substances Data)

Usage

Description

Aluminium sulfate octadecahydrate is a white crystalline powder and chunk, with a sweet taste and a density of 1.62 g/cm3. It decomposes at 86.5°C and is soluble in water. It is a hydrate resulting from the formal combination of anhydrous aluminium sulfate with approximately 18 mol eq. of water. The commercial product usually contains 5-10% less water than theory, making it one of the commonest hydrates of aluminium sulfate.

Uses

Used in Paper Industry:
Aluminium sulfate octadecahydrate is used as a pH control agent for pulp slurries, treatment of process waters, setting of dyes, and precipitating dissolved resin for setting the size on the fibers in its acidic solution form, which contains a slight excess of H2SO4.
Used in Water Treatment:
In its slightly basic form (containing a slight excess of Al2O3), aluminium sulfate octadecahydrate is used for the treatment of drinking and waste waters, such as reducing phosphorus content.
Used in Food Industry:
Aluminium sulfate octadecahydrate is used as a preservative in combination with EDTA to prevent discoloration of potatoes and maintain the firmness of shrimp packs. It is also used in pickles and pickle relish.
Used in Other Industries:
Other major applications of aluminium sulfate octadecahydrate include dyeing, tanning, catalysts, modification of concrete, and in the manufacture of various chemicals and pharmaceutical products.

Preparation

Prepared from bauxite, kaolin or aluminum compounds on reaction with H2SO4. The insoluble silicic acid is filtered out; the hydrate salt forms on crystallization.

InChI:InChI=1/2Al.3H2O4S.9H2O/c;;3*1-5(2,3)4;;;;;;;;;/h;;3*(H2,1,2,3,4);9*1H2/q2*+3;;;;;;;;;;;;/p-6