Method for recovering C2 and higher hydrocarbon components from dry gas
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Dry gas contains components such as hydrogen, methane, ethane, and ethylene, with the mass fraction of ethylene ranging from 12% to 25%. When using the PSA method for concentration, the required volume fractions of ethylene and ethane are 39% and 35%, respectively. Has this goal been achieved? Are there any better low-cost methods? Please explain in detail. How can impurities such as N2, O2, CO, CO2, and NxOy be removed from the gas after concentration using PSA?
Ethylene can be concentrated separately; its adsorption by alkanes is minimal. But what is the specific concentration requirement – that is, what level of ethylene content is needed?
After concentration, the volumes of ethylene and ethane contained are 39% and 35%, respectively. Was this achieved? Has it been put into use? Are there any limits on the scale?
Generally, an ethylene concentration of over 70% is acceptable; it’s not easy to reach such a high level of 35% for ethane, so large-scale applications have not been developed. However, model experiments have been conducted using an adsorber with a capacity of 3000 ML and a diameter of 100 mm. We have experience in scaling up carbon monoxide treatment systems, starting from adsorbers with a capacity of 3000 ML and a diameter of 100 mm, moving on to units with a capacity of 1 M3 and a diameter of 1000 mm, and then further scaling up to units with a diameter of 2600 mm and a capacity of 26 M3. If you are interested, we could first conduct a trial with a 1 M3, 1000 mm unit before proceeding to an industrial-scale implementation. What do you think?
How are impurities such as N2, O2, CO, CO2, and NxOy removed from PSA-concentrated gas? After pressure swing adsorption, these impurities must be removed naturally.