Purpose: Designing a set of downstream extracting craft and technical parameters that can be used in commercial production. Making the ha product reach the quality requirements of cosmetic grade ha.

目的：研究出一条可用于微生物发酵法生产HA的完整的下游分离工艺路线及其技术参数，使发酵的HA产品达到化妆品级HA的质量标准。

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An analysis is made of the causes for decrease in the percentage of superior grade urea product in the rainy season, and appropriate technical renovation measures are taken, with satisfactory results.

分析了雨季尿素优等品率偏低的原因，采取了相应的技改措施，取得了满意的效果。

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