# US 11,078,440 B2 · Method for processing used oils

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- Number: US 11,078,440 B2
- Document ID: US11078440B2
- Status: Granted
- Kind: B2
- Application number: 16/470,007
- Filed: 2017-12-15
- Published: 2020-03-19
- Granted: 2021-08-03
- Earliest claimed: 2016-12-16
- Assignees: Total Marketing Services
- Applicants: Total Marketing Services
- Inventors: Nicolas Champagne; Dominique Blain
- Web page: https://patentgrep.com/patent/US11078440B2

## CPC

- C10M 175/0008: {with the use of adsorbentia}
- C10M 175/0033: {using distillation processes; devices therefor}
- C10M 175/0058: {by filtration and centrifugation processes; apparatus therefor}
- B01J 20/20: comprising free carbon; comprising carbon obtained by carbonising processes
- C10M 2203/1045: used as base material
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

The invention relates to a method for lowering the content of polycyclic aromatic hydrocarbons (PAH) in a used lubricant composition, in which said used lubricant composition passes over activated carbon, said method not comprising a solvent extraction step.

## Claims

### Claim 1

A method for lowering the content of polycyclic aromatic hydrocarbons (PAHs) in a used lubricant composition, comprising the passing of said used lubricant composition over activated carbon, said method not comprising a solvent extraction, the quantity of activated carbon applied being between 0.5 and 60 g per litre of lubricant composition, wherein the method further comprises prior distillation of the used lubricant composition.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the quantity of activated carbon used is between 1 and 50 g per litre of lubricant composition.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the activated carbon is characterized by a density of between 200 and 500 kg/m3.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising prior filtering of the used lubricant composition.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the PAH is benzo-a-pyrene.

### Claim 6 (depends on 1)

The method according to claim 1, further comprising before the passing of said used lubricant composition over activated carbon:
one or more distillations; and
filtering.

### Claim 7

A method for preparing a lubricant composition comprising less than 100 ppb of each of the following PAHs : chrysene, benzo[b]fluoranthene, benzo[j]fluoranthene, benzo[k]fluoranthene, benzo[e]pyrene, benzo[a ]pyrene, dibenz[a,h]anthracene, benz[a ]anthracene, from a used lubricant composition, comprising the passing of said used lubricant composition over activated carbon.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the PAH is benzo-a-pyrene.

### Claim 9 (depends on 7)

The method according to claim 7, further comprising prior filtering of the used lubricant composition.

### Claim 10 (depends on 7)

The method according to claim 7, further comprising before the passing of said used lubricant composition over activated carbon:
one or more distillation stepsdistillations; and
filtering.