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    • 8. 发明授权
    • Catalytic dewaxing process using binder-free zeolite
    • 催化脱蜡工艺使用无粘结剂的沸石
    • US4908120A
    • 1990-03-13
    • US87199
    • 1987-08-20
    • Emmerson BowesFritz A. Smith
    • Emmerson BowesFritz A. Smith
    • C10G65/04
    • C10G65/043
    • A lubricant dewaxing process which is useful with difficult feeds, especially highly waxy feeds having paraffin contents in excess of 25 weight percent or feeds with high nitrogen levels, employs two-step dewaxing in which the first stage is carried out under relatively mild conditions using a binder-free zeolite dewaxing catalyst to obtain extended catalyst cycle life between successive reactivations with a constant temperature for the duration of each dewaxing cycle. The second stage dewaxing is also carried out with a binder-free catalyst under conditions which maintain the target pour point for the product with a progressively increasing temperature during each dewaxing cycle. More than one preliminary dewaxing stage may be provided in order to reduce severity in each stage with mild conditions and constant temperature being maintained in the preliminary steps. Using this process, extended catalyst cycle lives may be obtained with difficult feeds.
    • 用于难加工的润滑剂脱蜡方法,特别是具有超过25重量%的石蜡含量或高氮水平进料的高度蜡质进料采用两步脱蜡,其中第一阶段在相对温和的条件下进行,使用 无粘结剂的沸石脱蜡催化剂,以在每个脱蜡循环的持续时间内在恒定温度下连续反应之间获得延长的催化剂循环寿命。 在每个脱蜡循环期间,对于具有逐渐升高的温度的产品的目标倾点的条件下,还可以用无粘合剂的催化剂进行第二阶段脱蜡。 可以提供多于一个初步脱蜡阶段,以便在初步步骤中保持温和条件和恒定温度的各个阶段中减轻严重性。 使用该方法,可以通过困难的进料获得延长的催化剂循环寿命。