Abstract

A capillary method is proposed for determining the softening point of petroleum pitch. A pitch sample is heated in a glass capillary by an air flux and observed under a microscope. The softening point is measured at the instant when the pitch within the capillary shrinks and pulls away from the glass walls. The method is tested for two series of petroleum pitch samples: one is derived from heavy pyrolytic tar; and the other from decant oil (heavy gas oil from a catalytic cracking unit with microspherical catalyst). A broad range of softening point is found for these samples by the ring-and-ball method (90–200°C). Given the simplicity of the tests and the ability to determine the softening point over a broader range (up to 330–350°C) than in the traditional method, the capillary method may be recommended for use in determining the softening point of traditional binder and also of high-melting fiber-forming pitch.

中文翻译：

---

确定石油沥青软化点的快速方法

摘要

提出了一种确定石油沥青软化点的毛细管方法。沥青样品在玻璃毛细管中通过通气加热，并在显微镜下观察。软化点是在毛细管内的节距收缩并从玻璃壁拉开的瞬间测量的。该方法针对两个系列的石油沥青样品进行了测试：一个来自重质热解焦油；另一个来自重质热解焦油。另一种来自倾析油（来自带有微球催化剂的催化裂化装置的重质瓦斯油）。通过环球法（90–200°C）发现这些样品的软化点范围很广。鉴于测试的简便性以及能够在比传统方法更大的范围内（高达330-350°C）确定软化点的能力，