This conference encompasses scientific and professional activities in the fields of chemistry, chemical and biochemical engineering, food technology, biotechnology, medical biochemistry, pharmacy, environmental protection and related disciplines, and is also a gathering place for scientists and experts from all over Croatia and abroad. The main activities related to this conference are held in the newly renovated birthplace of Lavoslav Leopold Ružička, our first Nobel laureate, after whom this conference is named. This means that for the first time, the majority of the conference is being held in Ružička's birthplace and in the multimedia hall built in its courtyard. The theme of the conference is ''Science and New Technologies in Economic Development'', which aims to encourage the implementation of new technologies and the latest scientific and professional achievements in the development of the Croatian economy, especially in the development of the economy in the Vukovar area, which was severely destroyed during the Homeland War. At this conference, a presentation was prepared - a historical overview of the 11 Ružička Days held so far, and the Croatian Society of Chemical Engineers and Technologists (HDKI), as the main organizer of all previous conferences, prepared a ceremony of awarding certificates of appreciation to all deserving institutions, organizations, companies, economic entities and individuals who have made the most contributions to the organization of all previous conferences, and we are grateful to HDKI for this, because it has enriched this conference. In terms of content, the conference includes 8 (eight) plenary lectures by 4 (four) scientists from abroad and 4 (four) domestic scientists, several sponsored lectures and 56 (fifty-six) poster presentations. There are a total of 250 (two hundred and fifty) registered participants from 8 (eight) countries around the world, which is a respectable number, and there are also several participants exhibiting their production or sales program, as well as a series of accompanying events such as: the opening of a commemorative exhibition in the museum in Vukovar, the opening of a roundel with a memorial bust to our Nobel laureate Lavoslav Leopold Ružička in front of the Polytechnic in Vukovar, which also bears his name, the holding of the Professional Activities of Chemistry Professors of Vukovar-Srijem County the day before the opening of the meeting with a review of the scientific activities of Nobel laureate Lavoslav Leopold Ružička, a tour of the city of Vukovar, and excursions and similar social events.