How to determine the level of synthetic conversion rate
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Dear colleagues: When operating, we generally determine the level of synthesis conversion rate by considering factors such as the temperatures at the top and bottom of the synthesis tower, the temperature difference between these two points, and the purity of CO2. I’m curious to know how you determine the conversion rate in your operations (We use a full-cycle process here.) Are the analysis errors produced by the analysts quite large? It can only be used as an indication of the trend in synthetic conversion rate. What are the requirements for analyzing the synthesis conversion rate in your area?
There are several factors that affect the conversion rate: 1. Temperature； 2. Ammonia-to-carbon ratio ； 3. Water-carbon ratio ； 4. Synthesis pressure ； 5. Raw material purity. Except for temperature, which is relatively easy to understand, the other indicators require operational experience to assess. If the analysis carried out by the person in charge is inaccurate, it is necessary for the company to improve its management of analysis processes in order to ensure the accuracy of the data analyzed. Our company conducts conversion rate analysis once per shift. I’m curious to know what the frequency of such analysis is like for other colleagues in the industry – let’s discuss it!
This post was last edited by lxq700918 on 2009-12-8 at 08:43. Since the overall reaction for urea synthesis, 2NH3 + CO2 → CO(NH2)2 + H2O + Q, releases 24.4 kilocalories per mole (liquid) (gas) (liquid) (liquid), it is an exothermic reaction. As the temperature rises, it makes sense, as mentioned by the original poster, to determine the CO2 conversion rate by examining the temperature difference between the top and bottom of the synthesis tower; however, this requires some experience, as the specific heat capacities of the various reactants affect the degree of temperature increase. Therefore, differences in the ammonia-to-carbon ratio and water-to-carbon ratio can influence the temperature rise.