ISSN 2303-4521 Periodicals of Engineering and Natural Sciences Original Research Vol. 10, No. 2, April 2022, pp.445-454 © The Author 2022. This work is licensed under a Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) that allows others to share and adapt the material for any purpose (even commercially), in any medium with an acknowledgement of the work's authorship and initial publication in this journal. 445 Ultrasound assisted extraction of carotenoids from Sargassum Angustifolium algae Abbas Khalaf Mohammad 1 , Nawras Shareef Sabeeh 2 1 Department of Chemical Engineering, College of Engineering, University of Al-Qadisiyah, Iraq 2 Department of Mechanical Engineering, College of Engineering, University of Al-Qadisiyah, Iraq ABSTRACT An experimental batch extraction method was studied to obtain a carotenoid pigment from dried Sargassum Angustifolium algae using ultrasound as an enhancer and a mixture of ethanol-isopropanol as a solvent. The purpose of this work is to investigate the extraction kinetics as well as the temperature effects (303 to 333) K, solvent concentration (40% ethanol - 60% isopropanol to 60% ethanol - 40% isopropanol) and particle size (250 - 500, 500 - 710 and 710 - 1000) micrometer. Also, the effect of collecting, drying and transporting Sargassum Angustifolium algae on the total carotenoids extraction from dried algae was studied. The ultimate extraction value of the carotenoids was found to be 0.29% from algae. A batch model for extraction was created and numerically solved. The model parameters were calculated using existing empirical correlations and data gathered during this project. The model predicts the mass transport rate constant and saturation capacity at various temperatures. Furthermore, the energy of activation and frequency factor of the extraction process were enumerated and it was found that the process is endothermic with activation energy equals 28.9 kJ/mol. The utilized mathematical model agreed well with the experimental data, allowing it to be used in modeling and improving the carotenoids extracting process from Sargassum Angustifolium algae. Keywords: Sargassum Angustifolium algae, Carotenoids, Extraction, Kinetics, Modeling Corresponding Author: Abbas Khalaf Mohammad Department of Chemical Engineering College of Engineering University of Al-Qadisiyah Al- Qadisiyah, Iraq E-mail: abbas.shuaab@qu.edu.iq 1. Introduction Carotenoids (also known as carotenoid extract) are natural yellow, red or orange pigments. Almost carotenoid pigments are carotenoids derived from plants. Carotenoids are observed in the chloroplasts as a part of the biosynthetic system in green vegetation, but they are more numerous, marked, and colorful in fruits, flowers and roots [1]. Those photosynthetic organisms such as cyanobacteria, algae and higher plants, and also some non-photosynthetic organisms like bacteria and fungi have the ability to biosynthesize carotene in nature [2], [3]. Carotenoids play an important role in human health and survival. Also, they can boost the immune system, protect against cancer, and also act as an antioxidant. Therefore, carotenoids are an excellent oxygen scavenger, and are used as food coloring, food additives, pharmaceuticals and cosmetics because they bring health benefits to consumers [4]. The brown alga of Sargassum Angustifolium widely grows in the equatorial zone of Asia and it is a native Iraqi alga with colorful properties. It is abundant in the marine waters of the Shatt al-Arab in all seasons. Therefore, it can be considered as a sustainable source of carotenoid pigments. Carotenoids are poly isoprene substances composed of eight isoprene units and forty carbon atoms, with the