Lube extraction with NMP/phenol/water mixtures

Details Lube extraction with NMP/phenol/water mixtures Lube extraction with NMP/phenol/water mixtures

1974-06-05

1977-03-22

Levine, Herbert

Mineral oils: processes and products

Fractionation

Liquid extraction with solvents

208324, C10G 2106

Patent

active

040135497

ABSTRACT:
Lubricating oil stocks are upgraded by contacting same with a solvent comprising a mixture of n-methyl-2-pyrrolidone (NMP) and phenol. The solvent may also contain a minor amount of water. The phenol concentration in the solvent ranges between about 20 and 80 LV% based on the total amount of NMP, phenol and water in the solvent, while the water concentration in the solvent ranges between 0 and about 10 LV% based on the total amount of NMP, phenol and water in the solvent and preferably between about 1 and 4 LV%. At least a portion of the solvent is recovered from the thus-formed extract and raffinate phases by heating same to temperatures in the range of about 500.degree. to 700.degree. F., thereby flashing off the bulk of the solvent; remaining solvent may be stripped out from the extract and raffinate phases with an inert gas such as nitrogen, light hydrocarbons or hydrogen at superatmospheric pressures. The hot, stripped raffinate may be sent directly to a hydrofiner reactor, if desired, for further improvement of color, carbon residue, viscosity characteristics, sulfur removal, etc.

REFERENCES:
patent: 2754249 (1956-07-01), Myers et al.
patent: 2771494 (1956-11-01), Weedman
patent: 2902444 (1959-09-01), Shmidl
patent: 3415742 (1968-12-01), Eisenlohr et al.
patent: 3472757 (1969-10-01), Morris et al.
patent: 3476681 (1969-11-01), Davies et al.

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