By this process a soluble compound is usually separated from an insoluble compound. In other words, this is the separation of a substance from a mixture by preferentially dissolving that substance in a suitable solvent. This type of process is commonly performed after a chemical reaction as part of the work-up. Liquid-liquid extraction is a basic technique in chemical laboratories, where it is performed using a separator funnel. It is an extraction of a substance from one liquid phase into another liquid phase. 2.0 INTRODUCTION Liquid-liquid extraction also known as solvent extraction and partitioning is a method to separate compounds based on their relative solubility in two different immiscible liquids, usually water and an organic solvent (Propanoic Acid). The experiment was completely and successfully done. The value of mass transfer coefficient from liquid-liquid extraction are 0.242 mol/Lmin if titrated with 0.1M NaOH and 0.662 mol/Lmin if titrated with 0.025M NaOH. The samples were titrated with different of NaOH concentration (0.1M and 0.025M). Second experiment, we used liquid-liquid extraction column to obtain feed, raffinate and extract samples. The values for distribution coefficient by titration with 0.1M are 3.36 in 1.0 ml of propionic acid, 2.70 in 3.0 ml propionic acid and 1.88 in 5.0 ml propionic acid. First experiment, we used separators funnel to separate two solutions of different solubility and densities, and then titrate with 0.1M of NaOH. This experiment is based on the solubility. Turnitin : Percentage Similarity (18%)ฤก.0 ABSTRACT Based on the experiment objectives, which is to conduct the simple experiments regarding liquid-liquid extraction and to determine the distribution of coefficient and mass transfer coefficient with the aqueous phase as the continuous medium through liquid-liquid extraction. The experiment is considered successful since all the objectives are successfully achieved. As the concentration of sodium hydroxide, NaOH solution and the distribution coefficient, K values increases, the mass transfer coefficient of propionic acid will decreases. Meanwhile, for 0.1M NaOH, the mass transfer coefficients are 5.8451x10-3 m/min and 5.8620x10-3 m/min for K value 1.9272 and 1.8415 respectively. The mass transfer coefficients in 0.025M NaOH are 6.1402x10-3 m/min and 6.1632x10-3 m/min for K value 1.9272 and 1.8415 respectively. While for 0.1M sodium hydroxide, the samples need 81.5 mL, 15.9 mL and 2.2 mL in the same order as mentioned previously. The amount of 0.025M sodium hydroxide needed to turn the colourless feed, extract and raffinate solution to light pink were 253.8 mL, 52 mL and 4 mL respectively. The sample is titrated until the solution turns light pink. An indicator, phenolphthalein were added into the sample in order to detect alkaline ion. The sample collected from extraction equipment, namely raffinate, extract and feed were titrated with sodium hydroxide with different concentration. This experiment was carried out to determine the distribution coefficient and mass transfer coefficient of LLE. Usually, extraction is more preferable than distillation for separation application that is not cost efficient and applicable for distillation. This process is quite different with distillation because it focuses on relative solubility of the species rather than volatility. Liquid-liquid extraction is one of the separation technology used in industries.
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