Abstract
The utilization of spent sulfuric acid to produce sulfur dioxide can be accomplished by continuous mixing of the spent sulfuric acid (or acid tar) with a straight-run residuum in amounts to give a ratio of organic mass to sulfuric acid between 20 and 40, with an SR resid temperature of 200–250°C and a contact time of 3–5 min. The resulting semiasphalt is used in mixture with more SR resid as a feedstock for asphalt manufacture.
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