scholarly journals The Influence of Variable CO2 Emission Tax Rate on Flexible Chemical Process Synthesis

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1720
Author(s):  
Klavdija Zirngast ◽  
Zdravko Kravanja ◽  
Zorka Novak Pintarič

The emission of greenhouse gasses is a major environmental problem, and efforts are being made worldwide in various ways to encourage producers to reduce their emissions. There is a need to incorporate environmental measures into process design and synthesis, as pollution prevention is a higher priority than waste management, and in this way, more sustainable solutions can also be achieved. One possibility is to introduce a CO2 tax, the value of which is very uncertain in the future. This paper demonstrates how the CO2 tax affects the optimal results of synthesizing chemical processes using mixed-integer nonlinear programming (MINLP). It was found that the tax increase promotes the use of better-quality raw materials and more efficient process units. Energy consumption and emissions are reduced and economic performance deteriorates. A multi-period, two-stage stochastic approach with recourse is suitable to incorporate the uncertainty of the CO2 tax in the MINLP process synthesis and gives better results than a simpler deterministic approach. In the case of the heat exchanger network synthesis, the costs obtained with the stochastic approach were 5% lower, and the emissions 7% lower than with a deterministic approach.

Author(s):  
Christodoulos A. Floudas

Filling a void in chemical engineering and optimization literature, this book presents the theory and methods for nonlinear and mixed-integer optimization, and their applications in the important area of process synthesis. Other topics include modeling issues in process synthesis, and optimization-based approaches in the synthesis of heat recovery systems, distillation-based systems, and reactor-based systems. The basics of convex analysis and nonlinear optimization are also covered and the elementary concepts of mixed-integer linear optimization are introduced. All chapters have several illustrations and geometrical interpretations of the material as well as suggested problems. Nonlinear and Mixed-Integer Optimization will prove to be an invaluable source--either as a textbook or a reference--for researchers and graduate students interested in continuous and discrete nonlinear optimization issues in engineering design, process synthesis, process operations, applied mathematics, operations research, industrial management, and systems engineering.


Author(s):  
Seingheng Hul ◽  
Denny K. S. Ng ◽  
Raymond R Tan ◽  
Choon-Lai Chiang ◽  
Dominic C. Y. Foo

Material reuse/recycle has gained much attention in recent years for both economic and environmental reasons. Process integration techniques for water network synthesis have evolved rapidly in the past decade. With in-plant water reuse/recycle, fresh water and wastewater flowrates are reduced simultaneously. In this work, linear programming and mixed integer linear programming models that include piping cost and process constraints are developed to retrofit an existing water network in a paper mill that was not originally designed with process integration techniques. Five scenarios are presented, each representing different aspects of decision-making in real process integration projects. The fifth scenario makes use of fuzzy optimisation to achieve a compromise solution that considers the inherent conflict between maximising water recovery and minimising capital cost for retrofit.


2018 ◽  
Vol 204 ◽  
pp. 02007
Author(s):  
Inaki Maulida Hakim ◽  
Rolina Oktapiani Zaqiah ◽  
Yuri M. Zagloel Teuku

The increasing growth of automotive industry in Indonesia has not been matched by the number of local suppliers and makes the automotive industry too dependent on imported raw materials. Along with the needs of import activities, it is also required a greater logistics activities. However, with high logistics costs, the manufacturer must increase efficiency to be able to compete in the global market. This can be accomplished by planning inbound logistics activities that control the movement of materials from suppliers to the manufacture. In this research, an optimization methodology, based on Mixed Integer Nonlinear Programming (MINLP) approach is developed and solved with branch and bound algorithm. The result of this research, which obtained the total cost of optimal inbound logistics include material cost, transportation cost, and administration cost. This model can also be used as a tool for the company in making decisions about the type and the number of container also with the total of the optimal material load in each container, therefore the optimal container space utilization value can be obtained.


Environments ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 91
Author(s):  
Bruce Dvorak

It has been 30 years since, in the United States, the Pollution Prevention Act of 1990 focused attention on reducing pollution through cost-effective changes in production, operation, and raw materials use [...]


2018 ◽  
Vol 49 (5-6) ◽  
pp. 14-17
Author(s):  
Jessica Wade ◽  
Sebastian Wood

The combined challenges of growing populations, climate change and increasing scarcity of raw materials is driving innovation in materials and design. The motivation to innovate comes from the economic impact of not doing so, as well as consumer demand, with mature customers actively seeking out more environmentally sustainable solutions.


Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 210 ◽  
Author(s):  
Xiaojing Sun ◽  
Linlin Liu ◽  
Yu Zhuang ◽  
Lei Zhang ◽  
Jian Du

Compression–absorption cascade refrigeration system (CACRS) is the extension of absorption refrigeration system, which can be utilized to recover excess heat of heat exchanger networks (HENs) and compensate refrigeration demand. In this work, a stage-wise superstructure is presented to integrate the generation and evaporation processes of CACRS within HEN, where the generator is driven by hot process streams, and the evaporation processes provide cooling energy to HEN. Considering that the operating condition of CACRS has significant effect on the coefficient of performance (COP) of CACRS and so do the structure of HEN, CACRS and HEN are considered as a whole system in this study, where the operating condition and performance of CACRS and the structure of HEN are optimized simultaneously. The quantitative relationship between COP and operating variables of CACRS is determined by process simulation and data fitting. To accomplish the optimal design purpose, a mixed integer non-linear programming (MINLP) model is formulated according to the proposed superstructure, with the objective of minimizing total annual cost (TAC). At last, two case studies are presented to demonstrate that desired HEN can be achieved by applying the proposed method, and the results show that the integrated HEN-CACRS system is capable to utilize energy reasonably and reduce the total annualized cost by 38.6% and 37.9% respectively since it could recover waste heat from hot process stream to produce the cooling energy required by the system.


2016 ◽  
Vol 54 (10) ◽  
pp. 2544-2561 ◽  
Author(s):  
Nitish Singh ◽  
Jieqiong Ma ◽  
Jie Yang

Purpose Corporate environmental expenditure has been a growing concern in recent years, yet mixed findings exist regarding its economic impact. The purpose of this paper is to explain the mixed relationship between environmental expenditure and economic performance from the natural-resource-based view. Design/methodology/approach Using Global Reporting Initiative survey data from 120 firms in 30 countries, this study uses PROCESS, a path-based analysis software, to test the moderation and mediation hypotheses in an integrated analytical model. Findings The findings show that environmental expenditure has a negative impact on economic performance through pollution prevention capability. In contrast, environmental expenditure has a positive impact on economic performance through product stewardship capability. Both effects are significantly strengthened when the firm is located in an environmentally munificent country. Practical implications This study intends to inform firm managers, especially those in environmentally munificent countries, to relocate their environmental expenditure to enhance firms’ economic performance. In particular, firms should focus more on the reduction of input, such as raw materials, energy, and water, instead of output, including emissions, effluents, and wastes. Originality/value The contrasting indirect effects of pollution prevention and product stewardship offer a viable explanation for the mixed findings in the existent literature on environmental expenditure from a new perspective.


Sign in / Sign up

Export Citation Format

Share Document