PROCESS FOR PREPARATION OF CALCIUM THIOSULFATE LIQUID SOLUTION FROM LIME, SULFUR, AND SULFUR DIOXIDE
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United States of America Patent
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Oct 11, 2011
Grant Date -
Oct 27, 2011
app pub date -
Apr 21, 2010
filing date -
Apr 21, 2010
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Abstract
An efficient batch or semi-continuous method of production of relative high concentration, low byproduct-containing, calcium thiosulfate (CaS.sub.2O.sub.3) from lime, sulfur or calcium polysulfide, and sulfur dioxide under elevated reaction temperature conditions is described. The product is an emulsion of liquid calcium thiosulfate and solid byproducts. Under the conditions of the art, including the mole ratios of lime to sulfur, the temperature of the reaction process and the sulfur dioxide reaction conditions, including rate and duration, the byproducts are reduced to about 2% by weight.
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