Method for recovering sulfuric acid from sulfate salts
AssigneeDegussa-Huls AG
InventorsHans Albrecht Hasseberg, Hans Joachim Hasselbach, Klaus Huthmacher, Volker Hafner, Harald Heinzel
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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.
Claims11
A method for recovering sulfuric acid from sulfate salts accumulating in solution or in solid form during sulfuric acid hydrolysis of methylmercaptopropionaldehyde (MMP) cyanohydrin, comprising:
- combusting said sulfate salts obtained from the hydrolysis of MMP cyanohydrin in a combustion furnace to produce SO.sub.2 ;
- obtaining a gas mixture containing the SO.sub.2 produced from said combustion;
- passing said gas mixture containing SO.sub.2 through an aqueous solution of sulfuric acid and H.sub.2 O.sub.2 ;
- converting the SO.sub.2 contained in said gas mixture into sulfuric acid and recovering said sulfuric acid.
Dependencies are inferred from the claim text.