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use of high pressure to improve the produktqualitaet and verlaengerung of zyklusses the catalytic entwacksen of schmieroelen.
use of high pressure to improve the produktqualitaet and verlaengerung of zyklusses the catalytic entwacksen of schmieroelen.
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机译:使用高压来改善酶的生产质量和酶催化schmieroelen的催化活性。
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摘要
A process for preparing high quality lube base stock oil from waxy crude oil is provided which comprises separating from the waxy crude a distillate fraction thereof having an initial boiling point of at least 232 DEG C (450 DEG F) and a final boiling point labs than 566 DEG C (1050 DEG F), extracting the distillate fraction with a solvent selective for aromatic hydrocarbons to yield a raffinate from which undesirable compounds have been removed, catalytically dewaxing the raffinate in the presence of hydrogen to a pour point not higher than -1 DEG C (+30 DEG F) by contacting the raffinate at a temperature of 260 DEG C to 385 DEG C (500 DEG to 725 DEG F) at a hydrogen partial pressure of above 10350 kPa (1500 psia) in the absence of hydrotreating catalyst with a dewaxing catalyst comprising an aluminosilicate zeolite having a silica/alumina ratio above 12 and a constraint index of from 1 to 12 thereby forming dewaxed raffinate and lower boiling hydrocarbons, and topping the raffinate subsequent to dewaxing to remove therefrom the lower boiling hydrocarbons; thereby directly recovering substantially all of the remainder of the dewaxed raffinate, the remainder having a pour point not higher than -1 DEG C (+30 DEG F).
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