# US 11,078,430 B2 · Haze-free base oils with high paraffinic content

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- Number: US 11,078,430 B2
- Document ID: US11078430B2
- Status: Granted
- Kind: B2
- Application number: 16/471,639
- Filed: 2017-12-21
- Published: 2020-03-19
- Granted: 2021-08-03
- Earliest claimed: 2016-12-23
- Assignees: Shell Oil Company
- Applicants: Shell Oil Company
- Inventors: Eglantine Armelle Christiane Colette Marie Albe; Godfried Johannes Aarts; José Luís Moniz Jardim; Cornelis Hyacinthus Maria Van Der Hulst; Ralf Gunnar Meister
- Web page: https://patentgrep.com/patent/US11078430B2

## CPC

- C10G 21/02: with two or more solvents, which are introduced or withdrawn separately
- C10G 21/16: Oxygen-containing compounds
- C10G 21/28: Recovery of used solvent
- C10G 61/04: the refining step being an extraction
- C10G 2300/304: Pour point, cloud point, cold flow properties
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES

## Abstract

The present invention relates to a method for reducing the cloud point of a base oil with high saturates/paraffinic content to below 0° C., wherein the method comprises subjecting said base oils to a cloud point reduction step comprising adding said base oil to a solvent mixture, wherein the solvent mixture comprises a paraffin naphtha fraction and a co-solvent to obtain a solvent treatment mixture; and subjecting the solvent treatment mixture to a solvent de-waxing step.

## Claims

### Claim 1

A method for reducing the cloud point of a base oil comprising a high saturates and paraffinic content to below 0° C., the method comprising:
(a) combining the base oil with a solvent and a co-solvent to form a treatment mixture,
wherein the solvent comprises a paraffinic naphtha fraction, and
wherein the co-solvent comprises one or more of methyl isobutyl ketone, methyl butyl ketone, methyl propyl ketone, and methyl isopropyl ketone; and
(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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

The method according to claim 1,
wherein the combining the base oil with the solvent is done at a ratio of base oil to solvent of from 1:3 to 1:6, and
wherein the combining the base oil with the solvent is done at a temperature from 20° C. to 150° C.