Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1984-12-20
1985-10-15
Straub, Gary P.
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
422161, 55 73, 55226, 261 23R, C01B 1798, C01B 1748, B01D 4700
Patent
active
045473536
ABSTRACT:
A process for producing concentrated sulphuric acid from a hot gas stream comprising water and sulphur trioxide which process comprises feeding a first portion of said gas stream through a first sulphur trioxide absorption zone and a second portion through a second sulphur trioxide absorption zone; feeding a recycled sulphuric acid stream to said first sulphur trioxide absorption zone whereby substantially all of the sulphur trioxide and sulphuric acid are removed from said first portion of said gas stream to produce an enlarged sulphuric acid stream; recycling a first portion of said enlarged sulphuric acid stream through said first sulphur trioxide absorption zone; feeding a second portion of said enlarged sulphuric acid stream to said second sulphur trioxide absorption zone; and collecting sulphuric acid product from said second sulphur trioxide absorption zone; wherein the ratio of gases to sulphuric acid in said second sulphur trioxide absorption zone is such that the sulphuric acid product leaving said zone is of the desired concentration to a maximum of the azeotropic concentration. The process is of value in the production of concentrated sulphuric acid from waste sulphuric acid.
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Barlow C. Brian
C-I-L Inc.
Straub Gary P.
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