用尿素沉淀法和分子蒸馏法研究了二十碳五烯酸(简称e P A)、二十二碳六烯酸(简称d H A)乙酯的分离提纯。
In this study, urea inclusion method and molecular distillation method were applied in the purifications of ethyl ester of EPA and DHA.
二是使用真空蒸馏技术，环保、低碳；
The second one was to apply vacuum distillation technology which is low carbon and environmentally friendly.
采用高温高压法合成了聚碳硅烷(PCS)，通过改变合成条件与减压蒸馏温度的方法对PCS分子量及其分布进行调控。
The methods of precipitation and blending to adjust the molecular weight and distribution of polycarbosilane (PCS) synthesized at high temperature under high pressure were investigated in the paper.
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