10th Sustainable Process Innovation and Modelling Conference
jointly with
The 3rd International Conference on Cleaner Energy and Chemical Engineering for Sustainable Circular Economy (CLE-SCE 2026)
Sofia, Bulgaria
10-12 May 2026
Welcome to SPIL 2026
SPIL’26, the 10th Sustainable Process Innovation and Modelling Conference, organised by the Institute of Chemical Engineering, Bulgarian Academy of Sciences, is an established international forum dedicated to process modelling, optimisation, and integration for sustainability. The conference will be held jointly with the 3rd International Conference on Cleaner Energy and Chemical Engineering for Sustainable Circular Economy (CLE-SCE 2026).
SPIL’26 and CLE-SCE 2026 provide a high-level platform for scientific discourse, knowledge dissemination, and cross-fertilisation among researchers, engineers, and practitioners working toward cleaner energy systems, sustainable chemical engineering, and circular economy solutions.
All registration fees cover the presentation of a maximum of 2 papers, including 1 oral presentation.
The in-person fees cover the welcome party, the coffee breaks, the lunches, the Gala dinner, conference materials, and the social event.
If you had received a discounted fee, it covers the welcome party, the coffee breaks, conference materials, and the social event. There will be the option to arrange lunches (2×35 EUR) and the Gala Dinner (70 EUR) at the conference registration desk
Type of Participation
Early Bird (before 15 April 2026)
After 15 April 2026
In-person poster/presentation
Regular: 450€ Student:400€
Regular: 550€ Student:500€
Online poster/presentation
Regular: 200€ Student:150€
Regular: 200€ Student:150€
SPIL’26 is the 10th conference in the series established by Prof. J. J. Klemeš. It has been under the supervision of the PRISE Foundation since 2025. The sister conference, CLES-CE 2026, was founded by Prof. Petar Varbanov and Dr. Rayka Vladova in 2022.
The platform includes oral and poster presentations, as well as interactive discussion forums. The conference encourages participants to develop extended abstracts to be published in a book of abstracts and to be used as the basis for Special Issue invitations.
The scope includes (but is not limited to) the following topics, where the cleaner and/or sustainability dimensions are explicitly treated:
Process Systems Engineering and Process Integration for Sustainability
Sustainable supply and use of energy – industrial, residential, commercial, regional
Cleaner Production and Circular Economy
Waste and wastewater management
Minimisation and Mitigation of Environmental and Health Footprints
Technoeconomic and Life Cycle Assessment
Process analysis and modelling
Mathematical modelling and optimisation for sustainability improvement
Data-driven analysis for sustainability – process analysis, chemometrics, and AI
Operations and supply chain management
New Materials as Enablers of Low-Emission Technologies
Business and Social Aspects of Sustainable Development (New)
PRESENTATION FORMATS
Invited plenary lectures (TBA)
Oral (including keynote) and poster presentations.
Confirmed Plenary Speakers:
Zdravko Kravanja is a Professor and the Dean in the Faculty of Chemistry and Chemical Engineering at the University of Maribor, Slovenia. He joined the university after several years in industry (1981-1985). He was Visiting Researcher (1988-89) and Visiting Professor at Carnegie Mellon University, US (1997), and Guest Professor at Danmarks Tekniske Universitet, Lyngby on several occasions (from 1998 on). He was awarded with Pannonia Award in 2015 and Slovenian state price – Zois award for excellence in science in 2017. He was President of the Slovenian Academic Association for Engineering and Natural Sciences (SATENA) (2010-2011). He has recently become an associate member of Slovenian Academy of Engineering. His research over the years has been devoted mainly to the development of algorithmic techniques, strategies, and computerised tools for sustainable Process Systems Engineering, including Heat and Water Integration. Together with Professor Grossmann, he has developed a unique mixed-integer process synthesizer shell called MIPSYN, now upgrading to MIPSYN-Global. Recently, his research has been oriented towards the synthesis of sustainable systems, e.g. renewable based biofuel supply networks, using multi-objective optimization and monetary based sustainability measurements, sustainability profit and sustainability net present value. He has (co)-authored around 160 publications in scientific journals.
Jordan Hristov University of Chemical Technology and Metallurgy, Sofia, Bulgaria. Jordan Hristov is a Professor of Chemical Engineering. He graduated with as M.Sc.in Electrical Engineering, Technical University, Sofia, 1979. He was awarded Ph.D. in Chemical Engineering, University of Chemical Technology and Metallurgy, Sofia, Bulgaria, 1994 and DSc, in Chemical Engineering, University of Chemical Technology and Metallurgy, Sofia, Bulgaria, 2018. His areas of interest are Transport Phenomena, Mathematical Modelling, Fractional Calculus, Heat Transfer, Approximate analytical methods, and Dimensional analysis. With 185 research papers in various journals of high repute and listed by Web of Science, he got total citations of more than 3450 with h-index of 24 (Web of Science). In 2020 he was enlisted in the Stanford list of highly cited scholars among the first 1% (at 318 position in Chemical Engineering).In 2021 , 2022, 2023 and 2024he has enlisted again in the prestigious list of highly cited scholars. He was visiting professor in many universities abroad, among them: Polytechnic University of Catalonia, Spain (2002), University of Seville, Spain (2007) University of Northern Rio de Janeiro, Brazil (2009, 2010), Institute of Process Engineering, China Academy of Sciences, 2011, Tsinghua University (2018), University of Nancy, France (2021),etc. Professor Jordan Hristov is a Member of the Editorial Boards of Thermal Science, Particuology, Fractal and Fractional, Progress in Fractional Differentiations and Applications. The principle direction of his research in the last decade is related to approximate analytical solutions of non-linear and fractional problems, applications of non-singular fractional operators to non-local problems, fractional viscoelasticity, heat conduction, and non-linear diffusion.
List of Special Issues:
Selected papers will be invited for extension and submission to special issues of leading journals in sustainability and energy engineering:
Energy (Elsevier), IF=9.4, EiC: R. Wang
Discover Sustainability (Springer), IF=3.0, EiC: W.L. Filho
Thermal Science and Engineering Progress (Elsevier), IF=5.4, EiC: H. Jouhara, B. Sturm
Clean Technologies and Environmental Policy (Springer), IF=3.9, EiC: O.Q.F. Araujo
Journal of Sustainable Development of Natural Resources Management, EiC: X.C. Wang, P.S. Varbanov
Cleaner Energy Systems, EiC P. Seferlis, G, Besagni
Archives of Thermodynamics, EiC P. Ocłoń
Bulgarian Chemical Communications, EiC V. Beschkov
SPIL Conference 2026 