Journal
CHEMICAL ENGINEERING & TECHNOLOGY
Volume 30, Issue 2, Pages 265-269Publisher
WILEY-BLACKWELL
DOI: 10.1002/ceat.200600298
Keywords
carboxylic acids; hydrolysis; near-critical water
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The hydrolysis of iminodiacetonitrile (IDAN) in near-critical water, without added catalysts, has been successfully conducted with temperature and residence time ranges of 200-260 degrees C and 10-60 min, respectively. The effects of temperature, pressure, and initial reactant/water ratio on the reaction rate and yield have been investigated. The final reaction products primarily included iminodiacetic acid (IDA) and ammonia associated with other by-products; gas formation was negligible. The maximum yield of IDA was 92.3 mol.-% at 210 degrees C and 10 MPa, with a conversion of almost 100 %.The apparent activation energy and In A of IDAN hydrolysis were evaluated as 45.77 +/- 5.26 kJ/mol and 8.6 +/- 0.1 min(-1), respectively, based on the assumption of first-order reaction. The reaction mechanism and scheme were similar to those of base-catalyzed reactions of nitriles examined in less severe conditions.
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