5 research outputs found
유기폐기물 기반 바이오에탄올 공급 네트워크 수학적 모델 개발 : 다중 기간 확률론적 모델
No full text바이오에탄올은 최근 화석연료 사용량을 줄이기 위한 가솔린 첨가제로써 주목을 받고 있으며, 미국 및 유럽의 여러 나라에서 가솔린과 혼합되어 수송용 연료로 사용되고 있다. 전 세계 바이오에탄올의 80% 이상이 식량자원을 활용하여 생산되고 있지만, 개발도상국 등 여러 나라에서 식량자원은 에너지원으로 활용되기 어려운 실정이다. 최근 유기폐기물로부터 생산되는 아세트산으로부터 바이오에탄올이 생산될 수 있는 연구가 발표됨으로써, 유기폐기물 처리 문제 해결과 더불어 새로운 바이오에탄올 생산 경로의 도입 가능성이 확인되었다. 본 연구에서는 유기폐기물을 활용한 바이오에탄올의 최적 공급 전략을 위해 경제성을 최소화 하는 수학적 모델을 제시한다. 제안된 모델은 다중 기간 확률론적 모델로, 시간에 따라 변화하고 불확실성이 높은 여러 파라미터들 (ex, 유기폐기물 발생량, 아세트산 및 바이오에탄올 수율, 바이오에탄올 수요)의 영향이 고려된다. 모델 타당성 검증으로 국내 바이오 연료 보급정책 데이터를 기반으로 한 사례연구를 진행하여, (1) 아세트산의 조달 위치 및 양, (2) 바이오에탄올 리파이너리 위치, (3) 바이오에탄올 공급 위치 및 양을 결정한다. 본 연구 결과를 통해 유기폐기물 활용 바이오에탄올 생산 경로의 국내 도입 가능성을 확인할 수 있다.2
Carbon-Negative Food Waste-Derived Bioethanol: A Hybrid Model of Life Cycle Assessment and Optimization
No full textFood
waste (FW) can be converted to bioethanol via anaerobic digestion
(AD) and catalytic biorefinery processes, and bioethanol can be used
as a vehicle fuel. In the present study, a hybrid model framework
combining three different models (i.e., process simulation, life cycle
assessment (LCA), and supply-chain network (SCN) optimization) is
proposed to assess the environmental impacts on FW-based vehicle operation.
First, a conceptual design of a large-scale process is simulated for
AD and biorefinery processes. The overall energy efficiency of the
integrated AD and biorefinery process is estimated to be 16.2%. A
“well-to-wheel” LCA of FW-based bioethanol production
and vehicle operation in South Korea in 2030, which is a new FW scenario,
is performed and compared with the LCA of conventional FW treatment
and gasoline-fuel vehicle operation. The LCA results show that the
global warming (GW) impacts of the new FW scenario are carbon-negative
(−5.58 kg CO2 equiv. per 1 gal of bioethanol) and
14.1% lower than the GW impacts of the conventional scenario. An integrated
SCN optimization model for “well-to-pump” FW-derived
bioethanol production and “pump-to-wheel” vehicle operation
is then proposed to minimize the total GW impact by simultaneously
optimizing both strategic FW management and vehicle operation planning
decisions. Three real policy-driven scenario studies (according to
the utilization rate of FW valorization to vehicle fuel) were analyzed
by the developed hybrid model, and the results show that the GW impacts
of each scenario are −0.69, −0.99, and −1.29
kg CO2 equiv. per 1 gal of bioethanol, leading to carbon-negative
impacts by 2030
Highly selective, energy-free, and environmentally friendly one-pot production of linear α-olefin from biomass-derived organic acid in a dual-bed catalyst system
No full textLinear α-olefins (LAOs) such as 1-heptene and 1-octene are in high demand in the petrochemical industry. The increasing concerns about the environment and resource depletion have raised the importance of new technologies for producing LAOs from sustainable resources. We report for the first time the direct production of 1-octene from biomass-derived octanoic acid using a dual-bed catalyst system of RuSn/SiO2 and Al2O3. In this new catalyst system, the catalyst bed configuration and reaction temperature profile were found to be critical factors in controlling the 1-octene yield and purity. We obtained an unprecedented high 1-octene yield of 69.4% with 83.9% purity after optimization of the dual-bed catalyst system. Based on the experimental results, simulation models were developed to analyze the mass flow and energy efficiency of the new catalytic process that can convert 283 t per d of octanoic acid into 152 t per d of 1-octene. Life cycle assessment results proved that the newly-developed dual-bed catalyst system for 1-octene production from bio-based octanoic acid could be a key technology for producing environmentally sustainable LAOs with 56% lower CO2 emissions than conventional petroleum-based LAOs (6.51 vs. 14.95 kg CO2 eq.).11Nsciescopu
