Potassium Alum → Aluminum Sulfate

HRID 1638965Notes

Reaction equation

[OH-].[Al+3:2].[OH-].[OH-].[O-:5][S:6]([O-:9])(=[O:8])=[O:7].[O-:10][S:11]([O-:14])(=[O:13])=[O:12].[Al+3].[K+]>>[S:6]([O-:9])([O-:8])(=[O:7])=[O:5].[Al+3:2].[S:11]([O-:14])([O-:13])(=[O:12])=[O:10].[S:6]([O-:9])([O-:8])(=[O:7])=[O:5].[Al+3:2]

Participants

Reactant 2

HCID 24856Potassium Alum

HCID 10176082Aluminum Hydroxide

Product 1

HCID 24850Aluminum Sulfate

Procedure

The aluminum hydroxide sludge formed in Example 1 was added to 210 g of alum solution (8.3% Al2O3) to form basic aluminum sulfate. The process of dissolution took about 1 hour, which is quite rapid. No additional salts formed on standing or when cooled to 8° C. overnight. The resulting solution had an alumina content of 8.68%, a basicity of 49.5%, and was ready to use as a coagulant.

Sources & evidence

ORD record: ord-443ceca1d1be4fb49169a4c2c672ac71
Source dataset: uspto-grants-1989_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04882140

Reaction notes

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