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US 2003/0147803 A1Published application
Generation of boron-trifluoride and sulphuric acid from boron trifluoride hydrate
AssigneeElf Atochem S.A.
InventorsJEAN-PAUL CHALIEUX, CHRISTIAN PRALUS
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Abstract
The invention relates to the preparation of BF3 and H2SO4 of commercial grade from boron trifluoride hydrate effluents containing organic impurities. The process consists essentially in reacting the said effluent with oleum, in recovering the gaseous boron trifluoride thereby liberated and in subjecting the sulphuric acid by-product to treatment with hydrogen peroxide and to purging with air.
Claims7
Process for preparing boron trifluoride and sulphuric acid from a technical BF3 hydrate and oleum, characterized in that it comprises in succession the following steps:
- (a) reacting the oleum with the technical BF3 hydrate,
- (b) recovering the gaseous BF3 thereby liberated, and
- (c) subjecting the sulphuric acid by-product from step (a) to a treatment with hydrogen peroxide and to a treatment with air.
Dependencies are inferred from the claim text.