Carbon emissions analysis of producing modified asphalt with natural asphalt

IF 3.8 4区工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY Green Processing and Synthesis Pub Date : 2023-01-01 DOI:10.1515/gps-2022-8146

Xiuhong Zhang, Yun Zeng, Yong-nian Feng, C. Zhang, Ling Zhang

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Abstract

Abstract The modification mechanism of modified asphalt with natural asphalt was analyzed through Fourier transform infrared spectrum. The results show that the modification mechanism of both the natural asphalt and petroleum asphalt is mainly a physical blending process. The polar functional groups contained in natural asphalt make modified asphalt with natural asphalt have characteristic good scaling resistance and water stability. Subsequently, the carbon emissions of each link of asphalt production stage were quantified, and the influence of mining, transportation, and processing on the total carbon emissions were all analyzed by establishing the carbon emission calculation model of asphalt production. The calculation results of GREET model showed that the equivalent carbon dioxide emission (CO2e) of rock asphalt mining was only 9.4% of that of crude oil production. At the same time, the CO2e of modified asphalt with natural asphalt processing was 44.7% lower than that of petroleum asphalt, and the carbon emission of rock asphalt transportation accounted for only 1/3 of that of petroleum asphalt transportation. Furthermore, the increased energy consumption caused by petroleum asphalt transportation and modified asphalt with natural asphalt processing will partially offset the contribution of natural asphalt to reducing carbon emissions. Meanwhile, the CO2e of modified asphalt with natural asphalt was lower than that of petroleum asphalt when the content of natural asphalt exceeded 18%. Thereafter, the analytic hierarchy process calculation results showed that petroleum asphalt processing and transportation had the largest weight of carbon emissions in the production stage of modified asphalt with natural asphalt. Ultimately, it is significant to further reduce carbon emissions by increasing the content of natural asphalt, which will then inevitably lead to the reduction in the production and transportation energy consumption of petroleum asphalt.

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用天然沥青生产改性沥青的碳排放分析

摘要利用傅里叶红外光谱分析了天然沥青改性沥青的改性机理。结果表明，天然沥青和石油沥青的改性机理主要是物理共混。天然沥青中所含的极性官能团使改性沥青具有良好的抗结垢性和水稳定性。随后，通过建立沥青生产碳排放计算模型，对沥青生产阶段各环节的碳排放进行量化，分析开采、运输、加工对总碳排放的影响。GREET模型计算结果表明，岩石沥青开采的当量二氧化碳排放量(CO2e)仅为原油开采的9.4%。同时，经过天然沥青加工的改性沥青的CO2e比石油沥青低44.7%，岩石沥青运输的碳排放量仅为石油沥青运输的1/3。此外，石油沥青运输和天然沥青加工改性沥青造成的能源消耗增加将部分抵消天然沥青减少碳排放的贡献。同时，天然沥青掺量超过18%时，天然沥青改性沥青的CO2e低于石油沥青。随后，层次分析法计算结果表明，石油沥青加工和运输在与天然沥青改性沥青生产阶段的碳排放权重最大。最终，通过增加天然沥青的含量来进一步减少碳排放具有重要意义，这必然会导致石油沥青生产和运输能耗的降低。

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来源期刊

Green Processing and Synthesis CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL

CiteScore

6.70

自引率

9.30%

发文量

审稿时长

7 weeks

期刊介绍： Green Processing and Synthesis is a bimonthly, peer-reviewed journal that provides up-to-date research both on fundamental as well as applied aspects of innovative green process development and chemical synthesis, giving an appropriate share to industrial views. The contributions are cutting edge, high-impact, authoritative, and provide both pros and cons of potential technologies. Green Processing and Synthesis provides a platform for scientists and engineers, especially chemists and chemical engineers, but is also open for interdisciplinary research from other areas such as physics, materials science, or catalysis.