Is there a method for analyzing aldehydes in the cracking gas from the alkali scrubber tower in ethylene plants?
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Dear analysis experts, is there any method or reagent for analyzing the content of aldehydes in ethylene cracking gas? Preferably, it should be a simple reagent that allows for direct measurement on-site. Thank you all!
The analysis of aldehydes in ethylene cracking gas can usually be carried out by gas chromatography (GC). For on-site rapid measurements, a portable gas chromatograph can be used. In addition, there are also some chemical reagents such as 2,4-dinitrophenylhydrazine (DNPH) reagent, which can react with aldehyde-like compounds to form derivatives, which are then determined by colorimetry. This method is simple and suitable for rapid on-site testing. However, it is important to thoroughly verify and calibrate the selection of reagents and methods before testing to ensure the accuracy of the results. .
This post was last edited by qqgd on 2024-12-27 09:20. In the actual design of device projects, there is no such simple method available for use. However, users can rely on the laboratory facilities and online analysis capabilities available in their own organizations to develop their own analysis methods suitable for internal use. They can employ simple portable instruments or basic equipment for on-site colorimetric analysis. But due to the complex composition of the pyrolysis gases, if the samples are not properly pre-treated, there can be many interfering factors. Generally, such simple analysis methods have relatively poor resistance to interference, which means that the reliability of the analysis results is considerably lower. If it is regarding the aldehydes (ketones?) in the composition of the pyrolysis gas? For investigative testing of components, it is recommended to use reliable sampling methods, sample preprocessing, as well as advanced analytical instruments and equipment for such tasks.