Abstract
The metastable zone width of adipic acid-water solutions has been determined in a temperature range from 293.15 to 328.15 K and cooling rates from 1 to 30 K·h-1 by means of the conventional polythermal method, using a laser diffraction technique. In addition, it is proposed an alternative method for estimating the metastable zone width based on the solution density measured online. The apparent nucleation order is evaluated using the Nývlt equation. Experimental results showed that initial composition and cooling rate had significant effects on the metastable zone width. An increment in cooling rate increased the metastable zone width and an increment in initial composition decreased the metastable zone width. On the other hand, it was found that online density measurements could be used as an alternate method for estimating the metastable zone width. The comparison of metastable zone width obtained with both methods produced an average difference of 6.75 %. Finally, the apparent nucleation order calculated was 4.3 which is closed to the value 4.2 reported in the literature
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