Analysis method for the solid content in FCC slurry?
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In catalytic cracking units, how is the solid content of the slurry analyzed? Those who have relevant information, please share it! Thank you~ Also, in catalytic flue gas analysis, CO2 is easy to measure accurately; why is it difficult to measure CO and O2 accurately?
The methods you mentioned for determining the catalyst content mainly include: 1. The centrifugation method. This is a method specified in enterprise standards; it involves diluting the oil slurry with a solvent in a centrifugal tube, heating and mixing the mixture, then placing it in a high-speed centrifuge to cause the catalyst particles in the suspension to settle. The volume of catalyst present can be determined directly, and the catalyst content in the oil slurry can be calculated by referring to relevant tables. 2. The method for determining the ash content of petroleum products. This is a standard method, with the standard number being GB/T 508-91. During the operation, the sample is directly added to the flask that has reached a constant weight; ashless filter paper is used as a wick, and the sample is ignited and burned until only ash and residual carbon remain. The carbonaceous residue is then heated in a high-temperature furnace at °C to be converted into ash, after which it is cooled and weighed. This method produces a large amount of black smoke during combustion; the carbon residues take a long time to burn at high temperatures, and the repeatability of the test data is not satisfactory. 3. Standard experimental method for determining the total residue content in residue oil. This method is specified in the American Material Testing Standard, ASTM D4870-94. 4. Carbonization and calcination method. This is a method for analyzing the solid content of oil slurry that is widely accepted in China at present. In a specific heating furnace, a certain amount of oil slurry sample is subjected to carbonization through dry distillation at 1°C under nitrogen purge; thereafter, air at a certain temperature is used for purging to completely burn away the residual carbon. The remaining powder is cooled, weighed, and its content is calculated.
Regarding the smoke analysis you mentioned, could you please explain the operating conditions and the instruments used? Infrared gas analysis, magnetooxidation analysis, laser gas analysis, chromatography. All of these methods can be used for Austenite gas analyzers. I’m not sure whether what you mean by \"inaccurate\" refers to the instrument itself, or to the fact that the results can be confirmed as accurate; I just want to understand the reasons related to the processing process
1. The solid content of FCC slurry is determined in Room 1 of the Beijing Research Institute of Petrochemical Technology, using a method developed by them that is presumably recognized by refineries across the country. Beijing Research Institute of Petrochemical Technology is located at No. 18 Xueyuan Road, Haidian District, north of Beijing University of Science and Technology and south of the East Campus of Beijing Agricultural University. The poster can send the samples to that institution for analysis, or they can go there to learn these analysis methods; of course, both services are charged. 2. In the analysis of catalytic cracking regeneration flue gas, accurate analysis is easy to achieve due to the very high level of carbon dioxide. The level of carbon monoxide varies depending on the amount of excess oxygen during the regeneration process; it is also affected by the type and amount of oxidizing agents (or carbon monoxide conversion catalysts, which are catalysts containing trace amounts of precious metals) added during this process. As a result, the analysis findings show fluctuations. The common analysis methods for such smoke include Acheson gas analysis, infrared gas analysis, and chromatography. One of the reasons for inaccurate oxygen analysis is the possible influence of air, that is, air entering the sample during sampling and sample transfer. However, since the sample contains nitrogen, the oxygen content cannot be deducted based on the amount of nitrogen. Only by improving proficiency in analytical operations and enhancing the samplers and sampling techniques. It is recommended to conduct the analysis of regenerated flue gas online; Hangzhou Juguang Technology offers good solutions for this.
I don’t know what methods are used to determine the composition of smoke in our tests, but it’s certain that the results of those tests are often highly inaccurate.