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<p>by either <a href="page.php?w=acid">acid</a>s or <a href="page.php?w=Base_%28chemistry%29">bases</a> or can occur at neutral <a href="page.php?w=pH">pH</a> under elevated temperatures. The highest yields of ethylene glycol occur at acidic or neutral pH with a large excess of water. Under these conditions, ethylene glycol yields of 90% can be achieved. The major byproducts are the oligomers <a href="page.php?w=diethylene_glycol">diethylene glycol</a>, <a href="page.php?w=triethylene_glycol">triethylene glycol</a>, and <a href="page.php?w=tetraethylene_glycol">tetraethylene glycol</a>.</p><p>
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