The influence of the preparation and heat treatment of heavy tar on the yield, softening temperature, degree of coking, and density of petroleum pitch is considered. By adjusting the processing conditions, the physicochemical properties of pitch may be regulated, and pitch of specified quality may be obtained. The degree of coking depends linearly on the softening temperature of the pitch.

中文翻译：

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重质热解焦油的制备和热处理对石油沥青理化性质的影响。1. 沥青的收率、软化温度、焦化度、密度、沥青质含量

考虑了重焦油的制备和热处理对石油沥青的收率、软化温度、焦化程度和密度的影响。通过调整加工条件，可以调节沥青的理化性质，得到规定质量的沥青。焦化程度与沥青的软化温度呈线性关系。