Title:
【発明の名称】潤滑油の溶剤抽出
Document Type and Number:
Japanese Patent JP3036822
Kind Code:
B2
Abstract:
A lubricating oil stock is extracted with N-methyl-2-pyrrolidone to yield a primary raffinate useful as a high VI lubricating base oil and a primary extract. The primary extract is mixed with antisolvent and chilled to yield a secondary raffinate. This secondary raffinate is sufficiently reduced in aromatics that it is solvent extracted to yield medium to high VI lubricating base oil.
Inventors:
Avilino Sequeira Jr.
Application Number:
JP31298890A
Publication Date:
April 24, 2000
Filing Date:
November 20, 1990
Export Citation:
Assignee:
Bectel Corporation
International Classes:
C10G21/00; C10G21/02; C10G21/16; C10G21/20; C10G50/02; C10G53/06; C10G71/00; C10M101/02; C10N30/02; (IPC1-7): C10G21/00; C10G21/02; C10G21/16; C10G21/20; C10G71/00
Domestic Patent References:
| JP5626981A |
Other References:
【文献】米国特許3306849(US,A)
Attorney, Agent or Firm:
Hajime Tsukuni (2 outside)