提出了一种利用酸分离稀土的简便方法———酸分级结晶法。
An easy method of rare earth separation-acid fractional crystallization was put forward.
通过分级结晶提纯过程，可获得纯度达到99.5%以上的精萘产品。
The purity of refined naphthalene could be more than 99.5% by said fractional crystallization process.
通过正交试验，给出影响RDX丙酮重结晶粒度分级工艺的主要因素。
The principal factors affecting the grading process for the recrystallization of RDX from acetone are given through the orthogonal test.
采用80%的酸性乙醇提取、硅胶柱层析分离、乙醚分级沉淀、丙酮重结晶的工艺方法，从苦参中分离得到氧化槐果碱单体。
Besed on the extract with 80% acidities alcohol, separation by silica gel, precipitation by ether, oxysophocarpine was obtained from Sophora flavescens.
采用80%的酸性乙醇提取、硅胶柱层析分离、乙醚分级沉淀、丙酮重结晶的工艺方法，从苦参中分离得到氧化槐果碱单体。
Besed on the extract with 80% acidities alcohol, separation by silica gel, precipitation by ether, oxysophocarpine was obtained from Sophora flavescens.
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