refining zone

The pre lifting zone in the riser of the II FCCU in Jinxi General Works of Petroleum Refining and Petrochemicals was revamped by using the new lifting zone patent technique developed by Luoyang Petrochemical Engineering Corporation.

锦西炼油化工总厂采用洛阳石油化工工程公司的新型预提升段专利技术对Ⅱ套催化裂化装置反应提升管预提升段进行了改造，这是该专利技术的首次工业应用。

The main factors for the separative effect of pH-zone-refining Countercurrent Chromatography are discussed in this paper.

文中着重探讨了影响pH区带逆流色谱分离效果的流动相流速、逆流色谱转速、溶剂组成、样品量和酸碱度等主要影响因素。

These metals may be purified by a technique called zone refining.

这些金属可以用所谓“逐区提纯法”来提纯.