Research On Co-production Of Aromatic Hydrocarbons And Carbon Materials By Catalytic Co-pyrolysis Of Biomass And Life Cycle Assessment

With the development concept of carbon neutrality gradually gaining popularity,the clean utilization of waste has attracted much attention nowadays.Catalytic copyrolysis(CCP)is an efficient technology for mass disposal of various wastes.which can convert a large amount of multi-source waste into high value-added products in a short time,with both environmental and economic benefits.CCP combined with polygeneration technology can clean production process,maximize resource utilization and economic benefits,and open up a new direction for carrying out the development route of green economy.Based on this background,this paper proposed a novel method for the polygeneration of aromatic hydrocarbons and electrode materials by CCP of wastes,and the life cycle assessment(LCA)of the process was evaluated from different dimensions.1.Catalytic co-pyrolysis of soy sauce and bagasse for polygeneration of aromatic hydrocarbons and electrode materials.A resource utilization way is put forward with HZSM-5 as catalyst to prepare high-value products from catalytic co-pyrolysis of bagasse and soy sauce.Both laboratory-scale fixed-bed devices and gas chromatography/mass spectrometry experiments were carried out to study the effects of experimental conditions on the distribution of co-pyrolysis products,especially the generation of aromatics,determine optimum experimental conditions for the preparation of aromatics and analyze the mechanism of CCP reaction.In order to improve the comprehensive utilization value of waste,the solid products were used to prepare electrode materials.The study revealed that the total yield of aromatics could be up to 24.44 wt%,including 18.39 wt%yield of monocy-clic aromatic hydrocarbons at 650℃ under the conditions that the ratio of soy sauce to bagasse was 1:1 and the ratio of catalyst to feedstock was 8:3.Furthermore,the experimental values of aromatic hydrocarbons and monocyclic aromatic hydrocarbons were 9.54 wt%and 7.39 wt%higher than the theoretical values,respectively.This indicated that there was a synergistic effect of co-pyrolysis,which could significantly improve the yield of aromatics.In addition.Nitrogen-containing carbon materials prepared under optimal pyrolysis conditions(SBC)had better capacitance characteristics.When the current density was 1 A/g.the specific capacitance of SBC could reach 346.4 F/g.2.Life cycle assessment of catalytic co-pyrolysis system based on Aspen plus simulation.Based on laboratory data,CCP system model of waste was constructed on Aspen plus,and the LCA was carried out from three dimensions of energy,environment and economy.Data demonstrated that,in terms of energy,the pyrolysis process was the largest energy consumption unit and the most sensitive parameter affecting the energy consumption of the system,due to the large amount of energy consumed to maintain the continuous high temperature operation of the reactor.Self-heating through pyrolysis gas combustion and waste heat recovery could reduce energy consumption of the system,saving 4710.42 MJ per functional unit,equivalent to 160.72 kgce.In terms of environment,Catalyst was the most sensitive element affecting the life cycle of greenhouse gas emissions.Product utilization was able to fix or save greenhouse gas at approximately 649.76 kg CO2e per functional unit.In terms of economy,according to breakeven analysis,the system could exhibit a high level of risk resilience when the rated biomass input was over 300 kg/h.Product sales revenue was the most critical uncertain element affecting the profitability of system,so it was necessary to improve the quality of pyrolysis products and establish a stable sales channel.