本工作用甲苯作溶剂，乙醇作沉淀剂，用沉淀分级法，对溶聚丁苯橡胶（S-SBR）进行了分级。
Solution polymerized styrene-butadiene rubber ( S-SBR ) was fractionated by repeated precipitation method, using redistilled toluene as solvent and ethyl alcohol as precipitant.
本文报道采用分级分离并结合有机溶剂沉淀法，从牛眼中纯化出高纯度透明质酸，较其他方法简便，易形成规模。
This paper deals with the way of purifying highly purity hyaluronic acid from ox eye by fractionation and organic solvent precipitation.
一步法与硫酸铵分级沉淀法相比，方法简单，成本低廉，适宜工业化生产。
Compared with the latter, the one-step approach is simpler, cheaper and more suitable for industrial production.
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