Migration and transformation of sulfur during pyrolysis of waste tires for high-value utilization of poly-generation products

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2025-05-09 DOI:10.1016/j.wasman.2025.114868

Guangyang Li , Xiong Zhang , Shenghua Wang , Junjie Zhang , Haiping Yang , Kuo Zeng , Jingai Shao , Shihong Zhang , Hanping Chen

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Abstract

The three-state pyrolysis products of waste tires pyrolysis have high utilization value, and the migration and transformation of sulfur during pyrolysis of waste tires is one of the most important factors affecting product properties. Understanding the mechanism of sulfur migration and conversion during waste tire pyrolysis is necessary for high value utilization of poly-generation products. This work focused on the effects of different factors on product distribution and sulfur transformation during waste tires pyrolysis. The results showed that the migration of sulfur was predominantly attributable to the decomposition, conversion, and migration of aliphatic and thiophene sulfur to pyrolysis oil and gases. The decomposition rate of aliphatic sulfur and thiophene sulfur exhibits a gradual increase with the increase of pyrolysis temperatures and heating rates. However, the decomposition rate of aliphatic sulfur and thiophene sulfur in the recovered carbon black (rCB) exhibited a decline as the particle size of waste tires increased, with retention rates increasing from 12.4% to 16.6% for aliphatic sulfur and from 29.6% to 39.8% for thiophene sulfur. A large number of intermediate products ·SH and ·S radicals were produced, and this process was verified using DFT (Density Functional Theory) calculations. This paper provided a partial knowledge of sulfur migration and transformation in the three-state pyrolysis products during waste tires pyrolysis, which can provide valuable information for high-value utilization of waste tires and control technologies of pollutants emission.

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废轮胎热解过程中硫的迁移转化及多联产产品的高价值利用

废轮胎热解的三态热解产物具有较高的利用价值，而硫在废轮胎热解过程中的迁移转化是影响产物性质的重要因素之一。了解废轮胎热解过程中硫的迁移转化机理，对多联产产物的高价值利用具有重要意义。研究了不同因素对废轮胎热解过程中产物分布和硫转化的影响。结果表明，硫的迁移主要是由于脂肪族和噻吩类硫的分解、转化和向热解油气的迁移。随着热解温度和升温速率的升高，脂肪族硫和噻吩硫的分解速率逐渐增大。然而，随着废轮胎粒径的增大，回收炭黑中脂肪族硫和噻吩硫的分解率呈下降趋势，脂肪族硫的保留率从12.4%增加到16.6%，噻吩硫的保留率从29.6%增加到39.8%。生成了大量的中间产物·SH和·S自由基，并通过密度泛函理论（DFT）计算验证了这一过程。本文对废轮胎热解过程中三态热解产物中硫的迁移转化有了部分认识，可为废轮胎高值利用和污染物排放控制技术提供有价值的信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)