Process for producing lubricant base oil
First Claim
1. A process for producing a lubricant base oil having a pour point of 20°
- C. or less and an n-d-M ring analysis value of at least 10% CA from a feedstock oil which is selected from the qroup consisting of a distillate fraction boiling at 250°
C. or above obtained from a paraffin base or mixed base crude and a deasphalted oil obtained from a vacuum distillation residual oil of said crude, said process comprising;
(a) the step of bringing said feedstock oil into contact with a hydrofining catalyst in the presence of hydrogen under conditions to minimize hydrocracking and recovering a hydrofined oil;
(b) the step of dewaxing said hydrofined oil and recovering the dewaxed oil;
(c) the step of subjecting said dewaxed oil to extraction with a solvent having selective affinity for aromatic hydrocarbons so as to separate the feed into a raffinate portion and an extract portion, and removing the solvent from said extract portion to obtain an extract oil; and
(d) the step of treating said extract oil by means of contact with a solid adsorbent or sulfuric acid to stabilize said extract oil.
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Accused Products
Abstract
A process for producing a lubricant base oil with low pour point and high aromaticity from a feedstock oil which is either a distillate fraction boiling at 250° C. or above that is obtained from a paraffin base or mixed base crude or a deasphalted oil obtained from a vacuum distillation residual oil of said crude, and process comprising:
(a) the step of bringing said feedstock oil into contact with a hydrofining catalyst in the presence of hydrogen and recovering a hydrofined oil;
(b) the step of dewaxing said hydrofined oil and recovering the dewaxed oil;
(c) the step of subjecting said dewaxed oil to extraction with a solvent having selective affinity for aromatic hydrocarbons so as to separate the feed into the raffinate portion and the extract portion, and removing the solvent from said extract portion to obtain an extract oil; and
(d) the step of treating said extract oil by means of contact with a solid adsorbent or sulfuric acid.
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Citations
10 Claims
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1. A process for producing a lubricant base oil having a pour point of 20°
- C. or less and an n-d-M ring analysis value of at least 10% CA from a feedstock oil which is selected from the qroup consisting of a distillate fraction boiling at 250°
C. or above obtained from a paraffin base or mixed base crude and a deasphalted oil obtained from a vacuum distillation residual oil of said crude, said process comprising;(a) the step of bringing said feedstock oil into contact with a hydrofining catalyst in the presence of hydrogen under conditions to minimize hydrocracking and recovering a hydrofined oil; (b) the step of dewaxing said hydrofined oil and recovering the dewaxed oil; (c) the step of subjecting said dewaxed oil to extraction with a solvent having selective affinity for aromatic hydrocarbons so as to separate the feed into a raffinate portion and an extract portion, and removing the solvent from said extract portion to obtain an extract oil; and (d) the step of treating said extract oil by means of contact with a solid adsorbent or sulfuric acid to stabilize said extract oil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- C. or less and an n-d-M ring analysis value of at least 10% CA from a feedstock oil which is selected from the qroup consisting of a distillate fraction boiling at 250°
Specification