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In a stainless steel reactor having an inner volume of 1,000 ml and provided with a thermometer, a pressure gauge, and a stirrer, 200 g of nonylphenol (molecular weight 221), 0.6 g of sodium hydroxide as a catalyst, and 400 g of ethylene oxide were heated at 150° C. under pressure of 6.0 kg/cm2G of reaction. The resultant averagely 10-mole ethylene oxide adduct of nonylphenol and 2.7 g of an aqueous 50 wt% lactic acid solution added thereto were thoroughly stirred. The nonylphenol ethoxylate obtained as the result was tested for the effect of aging. The results are shown in Table 27.

1. customIn a stainless steel reactor having
2. customan inner volume of 1,000 ml and provided with a thermometer