Alkylbenzene-containing desorbent and its use for adsorption-separation of meta-aromatic hydrocarbon(s)

An adsorption-desorption agents kit, comprising a solid adsorbent and a liquid desorbent, wherein the solid adsorbent comprises at least 90 wt % of Y-type molecular sieve as an active component, the Y-type molecular sieve having a silicon oxide/aluminum oxide molar ratio of 4.0-6.0, preferably 4.3-5.7, and the liquid desorbent comprises or consists of 20-100 wt % of an alkylbenzene compound of the following general formula (I) and 0-80 wt % of a C5-C14 saturated aliphatic hydrocarbon,

• wherein:
• R1, R2 and R3, which may be the same or different, are independently selected from C1-4 chain alkyl groups, preferably, at least one of R1, R2 and R3 is methyl, more preferably at least two of them are methyl, and further preferably all of them are methyl;
• R4, R5 and R6, which may be the same or different, are independently selected from hydrogen, C1-4 saturated hydrocarbon group, C1-4 alkoxy group and halogen, preferably, at least one of R4, R5 and R6 is hydrogen or C1-4 saturated hydrocarbon group, for example, R4 or R6 is C1-4 saturated hydrocarbon group, more preferably, at least two of them are independently hydrogen or C1-4 saturated hydrocarbon group, for example, R4 and R6 are both C1-4 saturated hydrocarbon group, further preferably, three of them are independently hydrogen or C1-4 saturated hydrocarbon group, and particularly preferably, all three are hydrogen, wherein the alkyl group is preferably methyl.