Date of Award
Master of Science in Chemical Engineering (MSChE)
Chemical and Petroleum Engineering
Ali H. Al-Marzouqi
Ana Aguiar Ricardo
This thesis aims to develop and investigate an innovative use of date pits, a common and abundant agricultural waste in the UAE. It is suggested that date pits may be used to produce date pit oil, and the powder residue from this extraction process may be used as a low cost adsorbent for removal of lead from water. This thesis aims to investigate the effects of the parameters pressure, temperature, and particle size on the extraction yield when using supercritical carbon dioxide (SC-CO₂) to extract oil from date pit powder. This oil is a valuable component which has many applications in pharmaceutics and foodstuff. The residue powder, symbolized by CO₂-DP, is then investigated as a possible adsorbent for removal of lead ions from water. The adsorption capability of CO₂-DP is then compared to that of raw date pits (R-DP) and the residue powder of Soxhlet extraction (S-DP). A Box-Behnken RSM design is used to optimize the adsorption parameters, namely adsorbent dose, lead concentration, and adsorbent type. The highest yield of date pit oil obtained from SCCO₂ extraction, 10.29%, was achieved at pressure 500 bar, temperature 40, and particle size range <63 μm. The maximum extraction yield of SC-CO₂ is about the same as the extraction yield obtained from Soxhlet extraction, 10.3%, indicating that SC-CO₂ extraction is a reliable method for extracting oil from date pits. Furthermore, out of the three adsorbents tested, adsorbent type was not found to have a significant effect on the adsorption capacity for lead removal. At a constant pH of 4, the optimum adsorption conditions were found to be: dose of 0.0052 g/mL solution, lead concentration 196 ppm, time of 10 hours, and adsorbent type CO₂-DP. It is therefore suggested that oil be extracted from the date pits powder and the residue used in adsorption. In this way two useful products are produced from a readily available agricultural waste.
Sweidan, Haliemeh Imad, "Investigation of the Effect of Supercritical Carbon Dioxide Extraction on the Adsorption Capacity of Date Pits" (2017). Chemical and Petroleum Engineering Theses. 9.