The process of removing suspended, colloidal, and dissolved impurities from liquid petroleum products by filtering, adsorption, chemical treatment, distillation, bleaching, etc.

用过滤、吸附、化学处理、蒸馏、漂白等方法从液体石油产品中脱除悬浮、胶态及溶解杂质的过程。

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Meanwhile the refining process was improved, using crystallization from petroleum-benzene instead of high vacuum distillation. The process was simplified for the benefit of industry production.

同时改进了精制工艺，用石油醚-苯进行结晶代替高真空蒸馏，简化了工艺，有利于工业化生产。

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Oil refinery: Refers to a business that uses oil as its raw material to engage in the manufacture of petroleum products through the process of distillation, refining, or blending.

五石油炼制业：指以石油为原料，经蒸馏、精炼及掺配之炼制程序，从事制造石油制品之事业。

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