Fischer-tropsch feedstock derived haze-free base oil fractions

Patent metadata

Field	Value
Publication number	US-10934496-B2
Application number	US-201716471736-A
Country	US
Kind code	B2
Filing date	Dec 21, 2017
Priority date	Dec 23, 2016
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

The present invention relates to a method for reducing the cloud point of a Fischer-Tropsch derived fraction to below 0° C., wherein the method comprises subjecting the Fischer-Tropsch derived fraction to a cloud point reduction step comprising mixing the Fischer-Tropsch derived fraction, which comprises more than 80 wt. % of paraffins and 90 wt. % of saturates, with a solvent mixture (16), wherein the solvent mixture (16) comprises a paraffinic naphtha fraction (7) and a co-solvent (15); and subjecting the solvent treatment mixture (23) to a solvent de-waxing step (17).

First claim

That which is claimed is:

1. A method for reducing the cloud point of a Fischer-Tropsch derived fraction to below 0° C., wherein the method comprises:
(a) combining the Fischer-Tropsch derived fraction with a solvent and a co-solvent ( 15 ) to form a treatment mixture,
wherein the Fischer-Tropsch derived fraction comprises more than 80% of paraffins and 90% of saturates, with a solvent mixture ( 16 ),
wherein the solvent comprises a paraffinic naphtha fraction ( 7 ), and
wherein the co-solvent comprises one or more of methyl isobutyl ketone, methyl butyl ketone, methyl propyl ketone, and methyl isopropyl ketone;
(b) cooling the treatment mixture to a temperature of less than −20° C. to form a wax crystal and a de-waxed mixture comprising a portion of the solvent and a de-waxed oil;
(c) separating the wax crystal from the de-waxed mixture to form a separated de-waxed mixture comprising the portion of the solvent and the de-waxed oil;
(d) distilling the separated de-waxed mixture to form a distilled solvent and a de-waxed oil, wherein the de-waxed oil comprises a cloud point below 0° C.

2. The method according to claim 1 , wherein the paraffinic naphtha fraction ( 7 ) comprises paraffinic molecules comprising carbon chain length in the range of from 5 to 11.

3. The method according to claim 1 , wherein the paraffinic naphtha fraction ( 7 ) comprises paraffinic molecules of at least one of carbon chain length 6, 7 and 8.

4. The method according to claim 1 , wherein the paraffinic naphtha fraction ( 7 ) comprises paraffinic molecules of carbon chain length comprising one or more of 5, 6, 7, 8, 9, 10, and 11.

5. The method according to claim 1 , wherein the co-solvent further comprises methyl ethyl ketone.

6. The method according to claim 1 , wherein the weight ratio of the naphtha fraction to the co-solvent ( 15 ) is from 70:30 to 30:70.

7. The method according to claim 1 ,
wherein the combining the Fischer-Tropsch derived fraction with the solvent is done at a ratio of the Fischer-Tropsch derived fraction to solvent of from 1:3 to 1:6, and
wherein the combining the Fischer-Tropsch derived fraction with the solvent is done at a temperature from 20° C. to 150° C.

8. The method according to claim 1 , further comprising subjecting the Fischer-Tropsch derived fraction prior to the combining the Fischer-Tropsch derived fraction with the solvent.

Assignees

• Shell Oil Co

Inventors

• Albe Eglantine Armelle Christiane Colette Marie
• Aarts Godfried Johannes
• Moniz Jardim José Luís
• Van Der Hulst Cornelis Hyacinthus Maria
• Kieffer Eduard Philip
• Creyghton Edward Julius

Classifications

• C10G2300/302

  Viscosity · CPC title

• C10G2300/1022

  Fischer-Tropsch products · CPC title

• C10G2300/304

  Pour point, cloud point, cold flow properties · CPC title

• C10G21/16 Primary

  Oxygen-containing compounds · CPC title

• C10G21/28

  Recovery of used solvent · CPC title