Solvent dewaxing process

Details Solvent dewaxing process Solvent dewaxing process

1977-07-05

1978-12-05

Levine, Herbert

Mineral oils: processes and products

Paraffin wax; treatment or recovery

Separation of paraffin from oil

208 37, C10G 4308

Patent

active

041284720

ABSTRACT:
A solvent dewaxing process for removing wax from intermediate grade waxy petroleum distillate oils wherein a waxy oil stock, prediluted with 0-2 volumes dewaxing solvent is heated to a temperature in the range of about 110 to 130.degree. F for melting all wax therein; wherein the heated waxy oil stock/solvent mixture is cooled to about 5.degree. F above the depressed cloud point and is diluted with 1-5 volumes dewaxing solvent having a temperature 25.degree.-40.degree. F below the depressed cloud point for forming a wax/oil/solvent mixture having a temperature 5.degree.-15.degree. F below the depressed cloud point, and wherein the wax/oil/solvent mixture is further cooled at 1.degree.-8.degree. F/min. to a selected separation temperature in the range of 0 to -40.degree. F for precipitating additional wax. Precipitated wax is removed at the separation temperature to produce a wax free oil/solvent mixture which is subsequently fractionated to yield a dewaxed oil suitable for use in lubricating oils.

REFERENCES:
patent: 3350297 (1967-10-01), Torobin
patent: 3720599 (1973-03-01), Gould
patent: 3764517 (1973-10-01), Bodemuller
patent: 4013542 (1977-03-01), Gudelis et al.
Chen et al., "Chemical Engineering," Mar. 19, 1973, pp. 105 to 111.

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