The influence of diluents—the anthracene fraction of coal tar, wash oil, and heavy catalytic cracking oil—on two key characteristics of coal tar is considered: its viscosity; and the decrease in its α₁ fraction content on centrifugation. The content of the α₁ fraction is lower in pitch produced from coal tar purified by centrifugation with added diluents. The pitch yield is greatest when the diluent employed is heavy catalytic cracking oil.

中文翻译：

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稀释剂离心降低煤焦油中喹啉不溶成分的含量

稀释剂——煤焦油的蒽馏分、洗油和重催化裂化油——对煤焦油的两个关键特性的影响被认为是：它的粘度；以及离心时其α _{1级分含量的降低。}α ₁级分的含量在由通过添加稀释剂离心纯化的煤焦油生产的沥青中较低。当使用的稀释剂是重质催化裂化油时，沥青产率最高。