The concentrated ethylene oxide stream that leaves the top of the ethylene oxide stripper is optionally supplied to an ethylene oxide finishing unit, providing a purified ethylene oxide stream. The catalyst is preferably finely dispersed silver and optionally promoter metals on a support material, for example, alumina. The concentration of the alkaline solution is preferably from 5 to 50 wt %, most preferably from 10 to 30 wt %. FIG. A base is added at various positions downstream of the quench section of an ethylene oxide … Based upon a study of several plants, the present inventors have identified a number of regions where glycol ester hydrolysis is likely to occur: in the ethylene oxide stripper; in the flasher and subsequent sections in the quench bleed unit; in the glycol recovery unit (wherein a slip stream of the lean absorbent is supplied to the unit); and in the ethylene glycol reactor, multistage evaporator system, drying column and fractional distillation system of the ethylene glycol plant. Preferably, a base, as described herein, is added to the lean absorbent stream before being supplied to the ethylene oxide absorber. No. Preferably, the base is added such that the pH is maintained in the range of 5.5 to 9.5. Ethylene glycol used to be manufactured by the hydrolysis of ethylene oxide (EO) which was produced via ethylene chlorohydrin but this method has been superseded by a direct oxidation route. The reaction of ethylene oxide with water typically produces a glycol product stream consisting of almost 90 weight percent monoethylene glycol, the remainder being predominantly diethylene glycol, some triethylene glycol and a small amount of higher homologues. Such a quench section is described in U.S. Pat. With chromatographic or spectroscopic techniques, samples are taken from a variety of positions in the plant. One method of preventing acid corrosion is to replace carbon steel units with stainless steel units, but this is an expensive option and even stainless steel will corrode if exposed to low enough pH over extended periods. Alternatively, the ethylene oxide produced in the plant may be routed to an ethylene glycol unit. This includes into the fat absorbent stream (22), to the ethylene oxide stripper (23), to the lean absorbent stream (24), to the slip stream (30), to the water streams (29), to the quench bleed stream (14), to the dilute aqueous ethylene glycol solution (16), to the two-phase slurry containing stream (18) and to the glycol stream (32). In another embodiment of the present invention, the ethylene glycol process includes supplying the concentrated ethylene oxide stream, the purified ethylene oxide stream or any other ethylene oxide-containing stream to an ethylene glycol plant, producing glycol, wherein the ethylene glycol plant comprises an ethylene glycol reactor, a multistage evaporator system, a drying column, and a fractional distillation system, and wherein a water recycle stream passes from the multistage evaporator system to the ethylene glycol reactor and a water-depleted ethylene glycol stream passes from the multistage evaporator to the drying column; and adding a base into the water-depleted ethylene glycol stream and/or into the fractional distillation system.