| GRN Recycle Talk FAQ Answer |
Date: Thu, 5 Mar 98 11:51 WET From: FRIEDMAN.FRED@EPAMAIL.EPA.GOV (Fred Friedman) Subject: Re: Oil recycling processes (Mike Shim...)
March 5, 1998
Dear Mike,
There are several methods for recycling waste oil:
Acid/clay treatment is the most commonly used re-refining process, but it isn't the best way to do it since byproducts include acid sludge and spent clay. This is also an expensive process.
There are patented processes which you could look up:
1. By W.R. Seelbach, US Patent 3,879,264, April 22,1 957 assigned to Petroleum Reclaiming Corp this process utilizes an electrical system for heat purification, and filtration to remove suspended refining solids. A Sump pump is used to withdraw purified oil.
2. By M.M. Johnson, US Patent 3,879,282, April 22, 1975 assigned to Phillips Petroleum Co. involves reducing the ash and lead content with an aqueous solution of ammonium phosphate. Metal salts, lead, gas, ammonia and hydrogen sulfide are removed by filtration.
There are many different processes discussed in the book: Waste Oil Recovery and Disposal by Vaughn S. Kimball (Noyes Data Corp, 1975).
The general methods are:
Settling, centrifugation, flash distillation, fractionation, hydrofining, solvent extraction.
-- Research Library for RCRA