| 摘要 |
Aerosol propellants from the class n-butane, isobutane and propane cause increased amounts of corrosion with greater than 5 parts per million unsaturates as impurities. Unsaturate levels are reduced below 5 parts per million, and preferably below 2 parts per million and most preferably below 1 part per million, by passing the saturated hydrocarbon containing unsaturated contaminants through a sulfuric acid scrubber for a length of time sufficient to remove unsaturated contaminants in excess of 5 parts per million and passing the outflow from the sulfuric acid scrubber through a basic demister to remove the sulfuric acid. The sulfuric acid scrubbing takes place in a column by liquid-liquid contact. The saturated hydrocarbon is then allowed to vaporize, and is passed successively through a basic demister and, if moist, a drying agent.
|
