Engine collant recycling apparatus and process
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United States of America Patent
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-
Dec 1, 1992
Grant Date -
N/A
app pub date -
Jul 3, 1991
filing date -
Jul 3, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and a process for recycling used engine coolant employs a reverse osmosis process for separating ethylene glycol from a concentrate coolant solution. The engine coolant concentrate is pre-filtered through a series of filters and pressurized prior to being passed through a semi-permeable membrane. The membrane separates the feed stream into a permeate solution of ethylene glycol and water and concentrate solution. The concentrate solution is returned to a concentrate tank for continuous circulation through the apparatus. A heat exchanger maintains the temperature of the concentrate solution below a pre-established threshold.
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