Coking sulfur paste (CSP) is a hard-to-handle industrial solid waste. With the high sulfur content, CSP can be used to prepare asphalt modifier. This paper investigated the release characteristics of polycyclic aromatic hydrocarbons (PAHs) in CSP during heating. While heating from 42°C to 480°C, CSP demonstrated two weight loss stages in which certain organic compounds were evaporated from CSP. The volatiles were primarily benzene and four kinds of PAHs, including naphthalene, indene, fluorene, and phenanthrene. The total absolute release amount of volatiles increased with increase in temperature. Furthermore, to remove PAHs, CSP was sulfonated with 98% H₂SO₄. The optimal sulfonation conditions in the molten state of CSP were as follows: ratio of H₂SO₄ volume to CSP mass 60 μL·g⁻¹ and reaction time 60 min. At 160°C, the total absolute release amount of benzene and four kinds of PAHs decreased from 14.688 × 10³ to 0.18 μg·g⁻¹. Therefore, the removal of PAHs from CSP using a sulfonation agent is very effective, ensuring that CSP can be used in road engineering without pollution.

焦化硫糊（CSP）是难以处理的工业固体废物。由于硫含量高，CSP可用于制备沥青改性剂。本文研究了加热过程中CSP中多环芳烃（PAHs）的释放特性。从42°C加热到480°C时，CSP表现出两个失重阶段，其中某些有机化合物从CSP中蒸发。挥发物主要是苯和四种PAH，包括萘，茚，芴和菲。挥发物的总绝对释放量随温度的升高而增加。此外，为了除去PAH，用98％的H ₂ SO ₄磺化CSP 。CSP熔融态的最佳磺化条件如下：H ₂ SO比_相对于CSP质量60μL·g ^-1为₄体积，反应时间为60min。在160℃下，苯和四种PAH的总绝对释放量从14.688×10 ³降低至0.18μg ·g ^-1。因此，使用磺化剂从CSP中去除PAH非常有效，从而确保CSP可用于道路工程而不会造成污染。