Global Patent Index - EP 0028409 A1

EP 0028409 A1 1981-05-13 - De-ashing lubricating oils.

Title (en)

De-ashing lubricating oils.

Title (de)

Entfernen von Asche aus Schmierölen.

Title (fr)

Elimination des cendres d'huiles lubrifiantes.


EP 0028409 A1 (EN)


EP 80106712 A


  • US 9018379 A
  • US 9213879 A

Abstract (en)

A process for the production of an essentially ash-free oil stock from a lubricating oil containing ash-forming components comprising (a) contacting said lubricating oil with an aqueous ammonium salt treating agent; (b) removing a major portion of the water from the mixture resulting from combining said aqueous solution and said lubricating oil; (c) heating at least a portion of the product resulting from step (b) at a temperature in the range of about 320 DEG to about 420 DEG C for a period of time sufficient to decompose at least a portion of any ammonium salts of sulfonic acid and dialkyldithiophosphoric acid that are contained therein; (d) cooling the product from step (c) to a temperature in the range of about 150 DEG to about 180 DEG C; and (e) separating the solids from the product of step (d), optionally with subsequent hydrotreating and stripping of the oil thus obtained.

IPC 1-7 (main, further and additional classification)

C10M 11/00

IPC 8 full level (invention and additional information)

C10G 19/02 (2006.01); C10G 29/00 (2006.01); C10M 175/00 (2006.01)

CPC (invention and additional information)

C10M 175/0016 (2013.01); C10G 2400/10 (2013.01)

Citation (search report)

Designated contracting state (EPC)


DOCDB simple family

EP 0028409 A1 19810513; EP 0028409 B1 19840801; DE 3068812 D1 19840906; DK 464980 A 19810502; ES 496476 A0 19820116; ES 8202057 A1 19820116; FI 803415 L 19810502; GB 2064578 A 19810617; GB 2064578 B 19830824; GR 70787 B 19830323; PL 227595 A1 19810710; PT 72009 A 19801101; PT 72009 B 19810831; YU 278980 A 19830930