How are ethane and ethylene separated by chromatography?
Thread Content
How to separate ethylene and ethane using chromatography. Can a thermal conductivity cell detector be used? Can a programmed temperature rise method be used?
This post was last edited and replied to by dalian*aochao on 2010-12-27 at 13:12. Reply 1# Lv Guanglong: For general olefins, it is recommended to use alumina capillary columns or alumina packed columns; the FID detector is commonly used as well. This combination is quite common and standard, and it represents a well-established method for analysis. PLOT Q can be used for the separation of C1-C3, as well as some isomers of C4 and C14, generally for polar compounds. A volatile solvent that allows water to evaporate can also be used. Alumina C1-C10 isomers are generally problem-free, but it is sensitive to water. If there are no other impurity gas components in your sample, a programmed temperature rise may not be necessary. Generally, a wine kept at a constant temperature of 60 or 80 degrees is sufficient to meet your testing requirements
If the ratio of ethylene to ethane is similar, there are many columns available to choose from, and packed columns are preferable as they offer a larger column capacity, as well as less interference from heavier components and some other permanent gases. The detector is a TCD. If they are all trace components, FID can be used. If there is a significant difference between the contents of the two, especially when ethane is high and ethylene is low, it is necessary to pay attention to evaluating column capacity and resolution.