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.
FEES AND REGISTRATION. The registration covers the presentation of a maximum of 2 papers, including 1 oral presentation, and the social event.
Type of Participation
Early Bird (before 15 March 2026)
After 15 March 2026
In-person poster/presentation
Regular: 450€ Student:450€
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
Confirmed Plenary Speakers:
To be Updated…
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 