Preparation of High Quality Calcium Magnesium Acetate Using a Pilot Plant Process

摘要

A pilot-size drum pelletizer was employed to produce over 200 lb (91Kg) of calcium magnesium acetate (CMA) from unslaked dolomitic lime and acetic acid. Data from the single-step operation are directly scalable to industrial units having 125 tph nominal capacity. Particle-size distribution of pea-size CMA product pellets is relatively narrow. Attrition resistance is comparable to, or better than, that of commercial rock salt deicer. Product solution pH is 7.4. At least 0.2 mols of hydration water are retained per mol of calcium acetate. Product exhibits superior ice-melting characteristics. Capital cost is estimated at $3 million for an 80,000 tpy plant. At a stream factor of 0.5, total operating cost is 5.5 cents/lb (12 cents/Kg) CMA beyond the acetic acid input cost.