Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, Shandong, 250100, PR China.
Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, Shandong, 250100, PR China.
Chemosphere. 2022 Oct;304:135278. doi: 10.1016/j.chemosphere.2022.135278. Epub 2022 Jun 10.
Thermal treatment is a promising technique for treating petroleum sludge (PS). However, asphaltenes as a recalcitrant fraction of PS induce strong bounding between petroleum and minerals, and therefore lead to the need for high temperature and hence high energy consumption in thermal treatment of PS. In this study, a novel method combining a deasphalting pretreatment of PS with low-temperature thermal desorption (LTTD) was developed. The efficiency of deasphalting was found to be positively correlated to the ability of n-alkanes and asphaltene dispersants in dispersing asphaltenes. In treating six different kinds of PS, the residual oil contents were all below 2.5% after the deasphalting alone. Compared with direct thermal desorption at 600 °C for 1 h, dodecyl benzene sulfonic acid (DBSA)-assisted heptane deasphalting made thermal desorption at 350 °C for 1 h sufficient to treat these APS. The residual oil content of sludge after LTTD is lower than 0.45%. FT-IR, Raman spectra and XPS analysis confirmed that the carbon residue in APS after LTTD is primarily graphite state, which is extremely stable and does not migrate to the surrounding environment as compared with the crude oil in the APS. Hence, solvent deasphalting results in effective treatment of PS by LTTD, while the solvent can be recycled by distillation and crude oil recovered as value-added petroleum resource. The LTTD represents therefore a novel green strategy for treating PS and resource utilization.
热处理是一种有前途的处理石油污泥（PS）的技术。然而，作为 PS 中一种顽固的馏分，沥青质会导致石油和矿物质之间的强烈结合，因此需要在 PS 的热处理中使用高温和高能量。在本研究中，开发了一种将 PS 的脱沥青预处理与低温热解（LTTD）相结合的新方法。发现脱沥青的效率与正烷烃和沥青质分散剂分散沥青质的能力呈正相关。在处理六种不同类型的 PS 时，单独脱沥青后残油含量均低于 2.5%。与在 600°C 下直接热解 1 小时相比，十二烷基苯磺酸（DBSA）辅助庚烷脱沥青使在 350°C 下热解 1 小时足以处理这些 APS。LTTD 后的污泥残油含量低于 0.45%。FT-IR、拉曼光谱和 XPS 分析证实，LTTD 后 APS 中的碳残渣主要呈石墨状态，与 APS 中的原油相比，它极其稳定，不会迁移到周围环境中。因此，溶剂脱沥青通过 LTTD 有效地处理 PS，而溶剂可以通过蒸馏回收，原油可以回收为有价值的石油资源。因此，LTTD 代表了一种处理 PS 和资源利用的新型绿色策略。
