Based on the parameter estimation results a comparison of the predicted mass deposit values at each plate with experimental data is shown in Table 4. It is clear that a good agreement exists between the theoretical results,based on our model, and the experimentalvalues, within the experimental error (which was $10%). The results indicate that fouling is low in the first channel. This can be explained due to temperature distribution. It is known that fouling appears at temperatures greater than 683C and the temperature in this channel changes from 603C to 783C. Thus, only temperatures greater than 683C were sufficient to cause fouling, based on the reaction scheme. The same results were observed experimentally by Delplace et al. (1994). The maximum quantity of deposit is in channels 3 and 4 and a decrease in channel 5 (holding zone) is observed. Such a decrease in the holding zone has been observed by several authors and it is diffcult to explain (Lalande et al., 1985; De Jong and Linden, 1992). This may be attributed to the lownative protein concentration remaining in the last channels.