The advantage and disadvantage of the five recycling methods, direct heating, direct aqueous vapor, indirect aqueous vapor, reduced pressure distillation, precipitation method, is discussed.
探讨了直接加热法、直接水蒸汽法、间接水蒸汽法、减压蒸馏、酒精沉淀等五种回收方法的优缺点。
It is reveal by GC analysis that the purity of the TMP, treated by reduced pressure distillation and recrystallization in acetic ester, approximates to that of the reagent grade TMP.
GC分析结果表明：采用减压蒸馏及乙酸乙酯重结晶并用的方法精制的TMP纯度接近于试剂级TMP。
This paper introduced a new type and special structured vacuum pump unit suitable for dry type reduced-pressure distillation.
本文介绍适用于干式减压蒸馏的特殊结构真空抽气设备。
Veratryl alcohol was synthesized through the reduction of sodium borohydride from veratraldehyde with isopropanol as solvent, followed by solvent extraction and distillation under reduced pressure.
以藜芦醛为主要原料、异丙醇为溶剂，经硼氢化钠还原、溶剂萃取、减压精馏得到产物藜芦醇。
The reduced pressure distillation experiment on the liquid paraffin was done and the Engler distillation curve was obtained.
进行了石蜡油的减压蒸馏实验，得到了恩氏蒸馏曲线。
Garlic plant volatile was extracted by steam distillation under reduced pressure, and the chemical components were determined by GC-MS analysis.
采用减压水蒸气蒸馏法提取出蒜苗挥发物，用GC - MS法分析鉴定其化学成分。
The high-purity MPC standard sample was obtained by reduced pressure distillation and the removal of minor phenol with dilute sodium hydroxide solution.
反应产物经减压精馏、碱洗、水洗、干燥等精制处理，得到了纯度较高的M PC标准品。
The process flow and production practice of air-distillation and reduced-pressure distillation for tar in Jigang coking plant are introduced.
介绍了济钢焦化厂焦油常、减压蒸馏的工艺流程、生产实践。
The oil is extracted with suitable solvent from the oil treated with homogenizer. After removing the solvent by reduced pressure distillation, the oil is obtained finally.
本文使用分散机匀浆，利用溶剂提取油料中的油脂，再经减压旋蒸除掉溶剂，得到油脂。
The headspace gathered more ester compounds in aroma composition than that of reduced pressure distillation.
顶空法富集的芳香成分中酯类化合物含量较减压蒸馏富集法高。
The headspace gathered more ester compounds in aroma composition than that of reduced pressure distillation.
顶空法富集的芳香成分中酯类化合物含量较减压蒸馏富集法高。
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