Help: Recovery of dry gas from refineries
Thread Content
After the refinery dry gas is absorbed in an absorption tower using butane as the absorbent, the absorbent-rich liquid at the bottom contains the desired ethylene components; meanwhile, most of the methane is also absorbed. How can ethylene and methane be separated through desorption?
It still has to go through the gas distillation tower, right?
Control the methane absorption rate by adjusting the temperature at the bottom of the absorption tower
If the separation requirements are not high, cryogenic cooling technology can be considered; for high separation precision, deep cryogenic technology is the better choice.
If the concentration requirements are not high, shallow cryogenic treatment, membrane separation, or adsorption technologies can be considered. Depending on the requirements – namely, the ethylene recovery rate and the desired concentration of ethylene – the investment costs and operational expenses also vary. If a concentration at the level required for polymerization is needed, then deep cryogenic treatment is necessary