混合塑料废弃物催化快速热解的技术经济分析和生命周期评价,Energy & Environmental Science

当前位置： X-MOL 学术 › Energy Environ. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

混合塑料废弃物催化快速热解的技术经济分析和生命周期评价
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2023-06-05 , DOI: 10.1039/d3ee00749a
Geetanjali Yadav _{1,

2} , Avantika Singh _{1,

2} , Abhijit Dutta ₁ , Taylor Uekert _{2,

3} , Jason S. DesVeaux _{1,

2} , Scott R. Nicholson _{2,

3} , Eric C.D. Tan ₁ , Calvin Mukarakate ₁ , Joshua A. Schaidle ₁ , Cody J. Wrasman ₁ , Alberta C. Carpenter _{2,

3} , Robert M. Baldwin _{2,

4} , Yuriy Román-Leshkov _{2,

5} , Gregg T. Beckham _{2,

4}

Affiliation

废塑料的热解作为一种候选的化学回收技术引起了人们的兴趣。为了检验这种方法的潜力，我们对概念性催化快速热解 (CFP) 设施进行了技术经济分析 (TEA) 和生命周期评估 (LCA)，该设施每天可转化 240 公吨混合塑料废物。建模的基本案例预测，当联产品以平均市场价格出售时，苯、甲苯和二甲苯 (BTX) 混合物的最低售价 (MSP) 为每公斤 1.07 美元。我们预测，如果混合废塑料的价格低于 0.10 美元/公斤，或者原油价格超过 60 美元/桶，则芳烃产品流可以与原始 BTX 混合物（0.68 美元/公斤）相比具有成本竞争力。此外，我们估计基于 CFP 的废塑料转化可以减少 24% 的供应链总能源使用，但减少 2. 相对于现有制造工艺，每公斤 BTX 的温室气体 (GHG) 排放量增加 4 倍。敏感性分析强调，原料成本、副产品售价、产品分离的资本成本和运营成本是关键的成本驱动因素。此外，我们检查了另外三种产品组成不同的 CFP 工艺，即石脑油，以及产品富含 C 的情况₂ –C₄烯烃或 BTX 芳烃。虽然石脑油的 MSP（2.18 美元/千克）比原生石脑油高 4 倍，但富含烯烃和富含芳烃的产品案例都显示 MSP 可能降低高达 40%，降低 21%–45%总供应链能源和温室气体排放量相对于现有制造过程增加 2.2-3.8 倍。LCA 预测，在所有情况下，CFP 工艺的化石燃料消耗都低于原始制造，在某些情况下酸化、臭氧消耗和烟雾形成也较低，但高效用和原料制备要求导致其他指标的性能较差。总体而言，本研究强调了从经济和环境角度改善混合废塑料 CFP 的重要工艺参数。

"点击查看英文标题和摘要"

Techno-economic analysis and life cycle assessment for catalytic fast pyrolysis of mixed plastic waste

Pyrolysis of waste plastics has gained interest as a candidate chemical recycling technology. To examine the potential of this approach, we conducted a techno-economic analysis (TEA) and life cycle assessment (LCA) of a conceptual catalytic fast pyrolysis (CFP) facility that converts 240 metric tons/day of mixed plastic waste. The modeled base case predicts the minimum selling price (MSP) of a benzene, toluene, and xylenes (BTX) mixture at $1.07 per kg when co-products are sold at their average market prices. We predict that the aromatic product stream can be cost-competitive with virgin BTX mixtures ($0.68/kg) if the mixed waste plastics are available for less than $0.10/kg or if crude oil prices exceed $60/barrel. Moreover, we estimate that CFP-based conversion of waste plastics can reduce the total supply chain energy use by 24% but with a 2.4-fold increase in greenhouse gas (GHG) emissions per kilogram of BTX, relative to incumbent manufacturing process. Sensitivity analysis highlights that feedstock cost, co-product selling prices, capital cost for product separations, and operating costs are key cost drivers. Further, we examine three additional CFP processes that differ in product composition, namely naphtha, and a case where the products are rich in either C₂–C₄ olefins or BTX aromatic hydrocarbons. Whereas the MSP of naphtha ($2.18/kg) is ∼4-fold higher than virgin naphtha, both the olefin-rich and aromatics-rich product cases exhibit a potential reduction in MSP up to 40%, with a 21%–45% reduction in total supply chain energy and 2.2–3.8-fold increase in GHG emissions relative to incumbent manufacturing processes. LCA predicts that the CFP process exhibits lower fossil fuel depletion than virgin manufacturing across all cases as well as lower acidification, ozone depletion, and smog formation for select cases, but high utility and feedstock preparation requirements result in poorer performance across other metrics. Overall, this study highlights important process parameters for improving CFP of mixed waste plastics from economic and environmental perspectives.

更新日期：2023-06-05

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11