NOVELTY - A contaminated hydrocarbon stream is sequentially passed through adsorbent beds (I and II) respectively containing molecular sieves to adsorb contaminants on the sieves, and desiccant material. The desiccant material is contacted with regeneration fluid stream comprising water to adsorb portion(s) of water onto desiccant to form partially dried regeneration fluid stream in contact with partially hydrated desiccant material. The desiccant is then heated to release adsorbed water into partially dried regeneration fluid stream from which contaminants are desorbed.    USE - For removing contaminants from natural gas stream, and producing liquefied natural gas (both claimed).    ADVANTAGE - The molecular sieves and desiccant material can be regenerated. The controlled use of water reduces coking formation by suppressing the methanol decomposition reaction. The extended infusion of water suppresses the condition that promotes the decomposition reactions of adsorbed contaminants. Therefore improved cleaning of entire bed is enabled. The use of lower overall regeneration temperature prevents deactivation of molecular sieves.    DETAILED DESCRIPTION - A contaminated hydrocarbon stream (4) is passed through adsorbent bed (2) containing molecular sieves to adsorb contaminants onto the sieves. The stream is then passed through adsorbent bed (3) containing desiccant material. The desiccant material is contacted with regeneration fluid stream (10) comprising water to adsorb portion(s) of water onto desiccant material to form at least partially dried regeneration fluid stream in contact with partially hydrated desiccant material (3a). The partially hydrated desiccant material is heated to more than 100degreesC to release adsorbed water into partially dried regeneration fluid stream. The partially dried regeneration fluid stream is passed through sieves to desorb and remove portion(s) of adsorbed contaminants.    INDEPENDENT CLAIMS are also included for:    (1) method of regenerating molecular sieves;    (2) method for producing liquefied gas;    (3) method of removing methanol from hydrocarbon stream;    (4) method for removing contaminants from natural gas; and    (5) method for producing liquefied natural gas.    DESCRIPTION OF DRAWING(S) - The figure shows the 3-adsorber equipment and arrangement used for purifying contaminated hydrocarbon stream.    Adsorbent bed (2,3)    Adsorbent bed to be regenerated (2a)    Partially hydrated desiccant material (3a)    Contaminated hydrocarbon stream (4)    Treated hydrocarbon stream (5)    Regeneration vessel (6)    Regeneration fluid stream (10)