The hightemperature nitrogen dehydration method is to synthesize the certain molecular weight polyester polyol under the protection of nitrogen at hightemperature.
高温氮气脱水法是在氮气保护下，高温合成聚酯多元醇。
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Due to highdehydration rate, the lyophiled mango powder requires no preservative and can be stored for more than 5 years at normal temperature.