# US 4,399,252 A · Method of employing process oils from converted wastes in synthetic rubbers

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- Number: US 4,399,252 A
- Document ID: US4399252A
- Status: Granted
- Kind: A
- Application number: 06/247,202
- Filed: 1981-03-24
- Granted: 1983-08-16
- Earliest claimed: 1981-03-24
- Assignees: Petrocon Corporation
- Inventors: John J. Cunningham
- Web page: https://patentgrep.com/patent/US4399252A

## CPC

- C10M 175/00: Working-up used lubricants to recover useful products {(destructive distillation C10B; extraction and elimination of PCBs C10G7/006, C10G21/006, C10G25/006; combustion processes F23G; filtration, filters in general B01D); Cleaning (in a mechanical way B08B; integrated processes C23; solid waste B09B)}
- C08K 5/01: Hydrocarbons {(C08K5/0091 takes precedence)}
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Process oil is made by conversion from "waste" materials, particularly used oils, and most particularly used crankcase oils, by flash evaporation at about 250.degree. F. and filtration for removal of solids therefrom, to produce a product substantially free of water and low boiling point components and of contaminant solids, which has a flash point above 310.degree. F., or is blended with other products from the same process to produce a final product having a flash point above 310.degree. F., and an aromatic content above 10%, preferably above 20%, by weight. The product may be used generally in a wide variety of process oil applications but is most particularly adapted for use as a rubber process oil and such use is also part of the present invention.

## Claims

### Claim 1

A meethod of using previously used oil comprising treating said oil to remove water, low boiling point compounds, and solid contaminants therefrom to convert said previously used oil to a process oil having an aromatic content of at least 10 percent by weight and a flash point above 310.degree. F., and incorporating said treated previously used oil as a process oil in a synthetic rubber composition.

### Claim 2 (depends on 1)

A method, as recited in claim 1, wherein said previously used oil comprises primarily previously used crankcase oil.

### Claim 3 (depends on 2)

A method, as recited in claim 2, wherein said synthetic rubber is comprised primarily of polybutadiene.