Physical properties of activated carbon
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In LNG liquefaction plants, activated carbon possesses a reversible adsorption property, and it generally desorbs at high temperatures and low pressures. May I ask experienced users what these high temperatures and low pressures are typically?
The physical adsorption of activated carbon is indeed a reversible process, but what is often overlooked is that it is also a competitive adsorption process. Generally speaking, at the same molecular weight, aromatics are more easily adsorbed than naphthenes, and naphthenes are more easily adsorbed than straight-chain alkanes ； Furthermore, within a certain molecular weight range, organic compounds with similar molecular structures and larger molecular weights exhibit greater adsorption potential. Returning to the original question regarding what level of pressure and temperature is required for desorption, my personal opinion is that desorption will occur as long as the conditions are above the operating temperature and below the operating pressure. The question is, to what extent of desorption does the person asking want to achieve. However, LNG is a mixture; therefore, there are no ready-made tables for looking up these data. It can only be said that the greater the difference between the pressure and temperature and the operating conditions, the greater the degree of desorption.
Indeed, there are no specific figures available for reference, and I agree with what you said