| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject compound having high quality. SOLUTION: A high grade pyruvic acid ester obtained by distillation using a distillation tower having a capacity of an effective plate number of 1 or more, is transferred to a container for storage or carry as soon as possible, closed tightly, followed by keeping its temperature at a value or lower which is calculated from the following equation: log D=(2.75/(t+273)×10<3> -6.73, wherein D (d) is a storage time for carry, etc.; t ( deg.C) is the temperature controlled.
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