Magnesium thiosulfate solution and process for preparing same

Details Magnesium thiosulfate solution and process for preparing same Magnesium thiosulfate solution and process for preparing same

2005-07-26

2005-07-26

Silverman, Stanley S. (Department: 1754)

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

C504S188000

Reexamination Certificate

active

06921523

ABSTRACT:
An efficient process for the preparation of magnesium thiosulfate involves reaction of magnesium hydrosulfite and sulfur at elevated temperature. Magnesium hydrosulfite can be prepared from commercial magnesium oxide and sulfur. Sulfur dioxide can be used to maintain pH. The resulting product is an emulsion of liquid magnesium thiosulfate and solid byproducts. Under controlled conditions, including mole ratios of MgO to sulfur, temperature of the reaction process, and pH, as well as rate and duration of SO2purging, production of byproducts can be reduced to less than about 2% by weight. The magnesium thiosulfate solution can be prepared with concentrations of at least about 25%, preferably at least about 30%.

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