being regenerated the use of three contact zones is particularly preferred with two zones in use at the same time one a lead contact zone and the second a polishing zone while the third zone is being regenerated conditions for the contact involve temperatures in the range of about 10 u00b0 to 50 u00b0 c preferably 15 u00b0 to 25 u00b0 c although temperatures outside these ranges can be used generally the use of about 0 0001 to about 0 1 preferably 0 001 to about 0 01 grams of solid absorbent per gram of alkylene oxide being treated will give satisfactory results contact time in the range of from about 1 to about 60 minutes preferably 2 to 30 minutes will provide sufficient solid adsorbent treatment to attain the objectives of the method of this invention exceptionally useful activated carbons or charcoals include those obtained from lignite gas black coconut bagasse wood sawdust peat pulp mill waste blood bone etc specific activated carbons include calgon corporation granular carbons such as calgon f 400 norit granular activated carbons such as norit c cenco activated carbons products of central scientific company nuchar activated carbons products of west virginia pulp and paper company and products of darco division ici americas inc illustrative commercially available carbons include type cal granular carbon calgon corporation and norit ro 8 granular activated carbon norit corporation adsorption is preferably carried out by passing the impure alkylene oxide through a bed of granular activated carbon alternatively powdered activated carbon can be slurred in the impure alkylene oxide and separated by filtration a 3 4 id and 8 34 long column packed with 40 grams of solid adsorbent activated carbons calgon f 400 was used in a series of adsorption experiments.