Boric Acid → Ammoniumpentaborate

HRID 1981277Notes

Reaction equation

S([O-])([O-])=O.[NH4+:5].[NH4+].[B:7]([OH:10])([OH:9])[OH:8]>>[B:7]([O-:10])([O-:9])[O-:8].[B:7]([O-:10])([O-:9])[O-:8].[B:7]([O-:10])([O-:9])[O-:8].[B:7]([O-:10])([O-:9])[O-:8].[B:7]([O-:10])([O-:9])[O-:8].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5].[NH4+:5]

Participants

Reactant 2

HCID 7628Boric Acid

HCID 25041Ammonium Sulfite

Product 1

HCID 53249254Ammoniumpentaborate

Procedure

In addition, as may be seen from Equation 1, ammoniumsulfite and tetraborate ores produce ammoniumpentaborate (NH4.B5O8.4H2O), in quantitative yield contrary to the assertion in British Pat. No. 10,361 which teaches that as a sole product, ammoniumtetraborate (biborate of ammonia, (NH4)2B4O7.4H2O), was obtained from alkali metal and alkaline earth metal borates upon the treatment of their suspensions with ammoniumsulfite.

Sources & evidence

ORD record: ord-cc7a7bceb14d48e69b43bf382cd805e6
Source dataset: uspto-grants-1985_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04514326

Reaction notes

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