Nitrogen+Syngas 362 Nov-Dec 2019
31 December 2019
Problem No. 57: Higher moisture content in urea melt due to vacuum pressure issues
To illustrate the direct effect of vacuum level on the moisture content of urea prills please refer to the wt-% urea melt graph for aqueous urea at 140°C. As the absolute pressure increases (lower vacuum) the urea melt declines in concentration (water content % increases). With this illustrative graph, one can quickly see the effect of suction pressure on the moisture content of the urea melt. A non-optimum vacuum pressure is one cause of high moisture content in the urea melt, but there are also other possible causes as you will read in the round table discussion below. Sharing troubleshooting cases leads to a much wider view on the possible causes and helps to solve problems more quickly.
