The issue of deep hydrolysis

When the urea content is high, the hydrolysis temperature cannot be increased to meet the required levels, which in turn results in an excessive urea content in the wastewater discharged.

I understand what the original poster is asking: What is the upper limit of urea content in the ammonium carbonate solution fed into the hydrolysis unit under normal production conditions? If that’s the case, it’s still difficult to establish uniform criteria for this issue. Because different devices may have different upper limits for what they can withstand. For units with roughly similar production capacities, each company will experience different maximum processing capacities during construction, due to differences in equipment selection, internal components chosen, operating conditions, and so on. Determining its upper limit is based on whether the urea content in the final waste liquid from the hydrolysis unit is within acceptable limits. Of course, compared to hydrolysis units, when the processing volume is small, the hydrolysis effect can still be ensured even if the urea content is high ； If the processing volume is large, even with a low urea content, it may not be possible to ensure effective hydrolysis.

I agree with the moderator’s analysis; there are many factors that affect the efficiency of hydrolysis, and each case needs to be analyzed on its own.

Is the residence time for deep hydrolysis relatively long, and will there be more side reactions?

No, then how could it be with ammonia water of such low concentration? ?