TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: In the process: the extract stream is used as single feed in the OTO process or mixed with another oxygenate feed; the olefins (if present) in the contaminated LPG stream are extracted; the DME is extracted by using a liquid-liquid extraction column designed for counter-current extraction, where the feed is introduced below a point at which the extractant is charged in it; a volumetric feed ratio of the extractant to contaminated LPG stream is 0.2-1 to 40-1 (preferably 1-1 to 30-1) or 0.02-1 to 0.5-1 (preferably 0.1-1); an extractive distillation is used; an extractive distillation column is used, where the column is a packed or trayed column, preferably packed with quartz chips, Berl saddles or ceramic helices; a reaction diluent (diluent/oxygenate) is used in a molar ratio of greater than or equal to 1, where one molecule of an ether is considered to represent 2 oxygenate molecules, preferably not greater than 2.5; the contaminated LPG stream is derived from a fossil fuel source produced by enhanced oil recovery or enhanced gas recovery with an enhanced oil or gas recovery formulation comprising DME; and the contaminated LPG stream is obtained by fractional distillation, so that the contaminated LPG stream is a fraction with an upper boiling point of less than 25 degrees C, preferably less than 1 degrees C. Preferred Components: The contaminated LPG stream contains 30-70 mol.%, preferably 40-60 mol.% of DME. The purified LPG stream has an oxygenate content of less than or equal to 5 wt.%, preferably less than or equal to 10 ppmw. The extractant is methanol and/or water. EXAMPLE - Methanol extract of liquefied petroleum gas (LPG) fraction containing dimethyl ether was introduced as feed into an oxygenate-to-olefin (OTO) reactor. The feed was reacted in a fluidized bed reactor at a weight hourly space velocity (WHSV) of 5-40 per hour at 600 degrees C in the presence of ZSM-5 as catalyst, where an amount of steam used as diluent was in 1:1 molar ratio based on the oxygenate. The reaction effluent was quenched and condensed, and any residual oxygenate was stripped and recycled. The product was then split into a light olefin fraction or fractions (combination of separate ethylene and propylene fractions), and a paraffin fraction. The paraffin fraction was then combined with purified LPG fraction with an oxygenate content below the 10 ppmw.