The measurement of flash point for petroleum products is one of major analyzing item to refining installation, it has important action in produce process.
油品闪点测量是炼油装置一个主要的分析项目，它在生产过程中具有重要的作用。
As a byproduct of crude refining process petroleum coke features a low ash content, moderate volatility and a high heating value.
石油焦是炼油工艺的副产品，具有低灰分、一定挥发份和高热值的特性。
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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