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Bench-scale research demonstrated that using an efficient esterification step to integrate an ethanol with a carboxylic acid fermentation stream offers potential for producing valuable ester feedstocks and fuels. Polar organic acids from bacterial fermentations are difficult to extract and purify, but formation of the ammonium salts and their conversion to esters facilitates the purifications. An...
In connection with the determination of sulfate S, the sulfur mass balance for four bituminous coals was determined using different extraction procedures, including use of 1 m and 4.8 m HCl under nitrogen and under air, and at room temperature, 95°C and boiling point. Since HCl extractions yielded poor S mass balances (as low as 83%), acid extraction with formic acid was also evaluated. Extractions...
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