Sulfuric Acid → Boric Acid

HRID 845172Notes

Reaction equation

HRID 845172 reaction equation
[Ca:1].[Na].[B].[B:4]([OH:7])([OH:6])[OH:5].[S:8](=[O:12])(=[O:11])([OH:10])[OH:9]>>[S:8]([O-:12])([O-:11])(=[O:10])=[O:9].[Ca+2:1].[B:4]([OH:7])([OH:6])[OH:5]

Participants

7

Reactant 5

HCID 1118Sulfuric AcidHCID 7628Boric AcidHCID 5360545SodiumHCID 5460341CalciumHCID 5462311Boron

Product 2

HCID 7628Boric AcidHCID 24497Calcium Sulfate

Procedure

Another process to obtain boric acid starting from minerals containing calcium, sodium and boron, such as ulexite, is described by Werner Janik et al in the Polish Patent No. 218,576, issued Sept. 26, 1979 appearing in German publication No. 3,029,349, issued Apr. 16, 1981. It includes the manufacture of boric acid from Peruvian ulexite by heating of said ulexite in 96% sulfuric acid in an amount sufficient to precipitate calcium sulfate, resulting in a suspension of calcium sulfate in a solution of boric acid, plus other secondary products. The calcium sulfate is separated from the solution and is then treated with ion exchange apparatus in order to obtain the boric acid by acidification, crystallization and purification.

Workup

  1. customto precipitate calcium sulfate

Sources & evidence

ORD record
ord-e7c920cc751f4d36b391f6f3f6c69a33
Source dataset
uspto-grants-1988_07
Patent number
US04756745

Reaction notes

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