Method for recovering sulfuric acid from sulfate salts

Details Method for recovering sulfuric acid from sulfate salts Method for recovering sulfuric acid from sulfate salts

1998-12-08

2000-11-14

Griffin, Steven P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423523, 423530, 4235411, 423542, 42324301, C01B 1774

Patent

active

061466123

ABSTRACT:
A process is provided for the recovery of sulfuric acid from NH.sub.4 HSO.sub.4 and (NH.sub.4).sub.2 SO.sub.4 salts produced from the sulfuric acid hydrolysis of methylmercaptopropionaldehyde (MMP) cyanohydrin to produce 2-hydroxy-4-methylthiobutyric acid (MHA), which can be used as an additive in animal feed. The sulfate salts are combusted in a furnace to produce sulfur dioxide; the sulfur dioxide is contacted with an aqueous solution containing sulfuric acid and hydrogen peroxide, where the sulfur dioxide is converted into sulfuric acid. The product sulfuric acid is recovered.

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patent: 4912257 (1990-03-01), Hernandez et al.
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patent: 5847207 (1998-12-01), Suchsland et al.
patent: 5976609 (1999-11-01), Hasseberg et al.
English Abstract for DE 40 36 899 A, May 21, 1992.

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