| 摘要 |
A reactor for catalytically dewaxing a waxy distillate consisting of a lubricating oil or liquid petroleum feedstocks utilizing a shape-selective crystalline aluminosilicate zeolite catalyst in order to obtain a lubricating oil having a low pour point and a high viscosity index, particularly, a plate-type hydroprocessing trickle reactor construction for catalytically dewaxing liquid petroleum feedstocks. The reactor is essentially constituted of an inclined plate trickle bed reactor wherein a tray of generally permeable construction supports a bed of catalyst material, such as crystalline zeolite, and in which the liquid petroleum feedstock trickles downwardly through the catalyst material from the upper end of the reactor towards the lower end of the reactor, while hydrogen is concurrently injected into the space below the permeable tray at the upper end of the reactor in the direction towards the lower end of the reactor. The hydrogen, under a slight superpressure passes through the permeable plate and percolates through the catalyst bed to thereby contact and efficiently strip the downwardly trickling stream of liquid petroleum feestock of low boiling conversion products or waxy components, such as naphtha. The generated gases resulting from the reaction, such as hydrogen, naphtha and LPG are collected in a head space provided above the catalyst bed on the permeable plate, and are scavenged at one end of the reactor through entrainment in an inert carrier gas introduced into the reactor at the opposite end thereof and which flows through the head space above the catalyst.
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