Supercritical fluids are involved in numerous industrial processes especially food industry and have a potentially wide field of new applications. The current applications of supercritical fluid include extraction processes, reaction chemistry and polymerization, food fractionation, waste recycling, soil remediation, cleaning of electronic and optical equipment parts, impregnation, dry powder coating, aerogels, nanotechnology, and crystallization and particle formation of pharmaceuticals and many other powdered products. In food industry, the most commonly use are in rapid analysis for fat content, rapid analysis for pesticides in foods, detection of food pollutants, encapsulation of liquids for engineering solid products, removal of alcohol …show more content…
Extraction is a simple process. Several methods are found can be used to separate the solute from the supercritical fluid, which acts as the solvent. There are three basic concepts used to achieve this. First is to change the temperature or pressure so that the solvent capability of the supercritical fluid can be changed. Second is to “wash” the solute out of the supercritical fluid by using a solvent that can strip the solute from the supercritical fluid. The last method which can be used to separate the solute from supercritical fluid is to separate multiple solutes within the supercritical fluid using a packed …show more content…
In principle, the separation of caffeine from CO2 can be achieved by reducing pressure. However, this will lead to high costs for recycling the CO2. Another alternative techniques are used to separate the caffeine isobaric from the supercritical CO2. One of the techniques is to absorb caffeine onto activated carbon. The advantage of this method is that energy consumption is reduced. Another technique is absorption in water, since the equilibrium concentration of caffeine in water is much higher than in gaseous phase. An addition advantage of this method is that the extracted caffeine can be recovered and sold as an additional product. Both of these technique are currently used in commercial processes for
If the hydrolysis to the diacid is not complete, one can use the process of acid base extraction by neutrazing the diacid using the base to form two separated layer. Then, after extraction, one can acidified the product to form the solid precipitates, which is the diacid.
The objective of this experiment was to perform extraction. This is a separation and purification technique, based on different solubility of compounds in immiscible solvent mixtures. Extraction is conducted by shaking the solution with the solvent, until two layers are formed. One layer can then be separated from the other. If the separation does not happen in one try, multiple attempts may be needed.
Caffeine, a central nervous system stimulant, is the main psychoactive ingredient in energy drinks, which enhances alertness and mood, and counteracts symptoms of sleep. There is no doubt ...
Caffeine is a mild stimulant that occurs naturally in at least 63 plant species. Caffeine can be found in the leaves, stems, seeds, and roots of these various plants. Caffeine is part of the methylxanthine family. It consists of a xanthine molecule with three methyl groups attached to it. Caffeine can be found in many products like sodas, tea, and coffee, but it also occurs in several other products such as prescription medications, diuretics, and pain relievers. Caffeine’s widespread use and popularity have caused many people to view the substance as an addictive drug. Thus making caffeine the most inexpensive and readily available drug known to man. Then on the other hand there are people who view caffeine as a helpful stimulant that increases the individual’s concentration and awareness as well as many other physical traits. The important thing to remember is that caffeine’s affects vary based on the person, the amount ingested, the frequency of consumption, and individual metabolism. (http://www.pp.okstate.edu/ehs/kopykit/caffeine.html)
Does one drink caffeine? Caffeine is everywhere, it's in everything, it's apart of our daily lives. That’s what people doesn’t realizes; every soda drink, every cup of coffee, and every energy drink he or she gulps down before a thrilling game, all of that is caffeine. Caffeine is only completed when he or she get addicted. Caffeine can be an exceptional threat to the human body; energy drinks for example, it has enough caffeine to kill someone if he or she drinks enough. Energy drinks has been the number one drink high school students drink to stay awake in school; they even bring the drink in classrooms, and more than one energy drink. Soda has enough caffeine to destroy ones inner body. Soda is a everyday drink for some individuals, they
Scrutiny of caffeine and its effects has increased dramatically in the last 20 years, due in part to an increase in consumption of caffeine. In fact, coffee consumption among young adults rose to 3.2 cups per day in 2008 from 2.4 cups per day in 2005 (Rokerya 1). For instance, in a one hour period, on Richland College’s on-campus Starbucks, the author took note of how many customers arrived and purchased a cup of coffee. Between 8:00 and 9:00 AM, there were 51 customers, implying that – especially at college - many people are dependent on coffee in the mornings. However, the results from these studies are inconclusive and often somewhat contradictory – many studies (such as that by Tetsuya Ohara et al.) show that caffeine is a great boon to
The crude extract obtained by solvent extraction was subjected to various qualitative tests to detect the presence of common chemical constituents as:
The purpose of this experiment was to learn and preform an acid-base extraction technique to separate organic compounds successfully and obtaining amounts of each component in the mixture. In this experiment, the separation will be done by separatory funnel preforming on two liquids that are immiscible from two layers when added together. The individual components of Phensuprin (Acetylsalicylic acid, Acetanilide, and Sucrose as a filler) was separated based upon their solubility and reactivity, and the amount of each component in the mixture was obtained. Also, the purity of each component will be determined by the melting point of the component.
Once the mixture had been completely dissolved, the solution was transferred to a separatory funnel. The solution was then extracted twice using 5.0 mL of 1 M
Aerogel was discovered in the late 1930’s by chemist Samuel Stephens Kistler. He accomplished this by the process of supercritical fluid drying. A supercritical fluid is any substance at a temperature and pressure above its critical poi...
Starting this experiment, we knew that the extraction was going to form varies layers due to the density differences. When placing three different substances, we saw that two layers formed because the Clove Oil is soluble in MTBE, but not in water. In order, to get the organic layer we used separatory funnel to take out the excess substances and leave the oil layer. Then we transferred to a beaker and dried with Magnesium Sulfate. Lastly, we filtered the liquid using funnel; we placed the liquid to boil, let it cool to room temperature. The purpose of drying and evaporation is to help us with the Gas Chromatography analysis of the product.
In the United States, coffee is the second largest import (Roosevelt, 2004). Furthermore, the United States, consumes one-fifth of all the worlds¡¦ coffee (Global Exchange, 2004). The present industry is expanding. It is estimated that North America¡¦s sector will reach saturation levels within 5 year (Datamonitor. n.d.). According to National Coffee Association (NCA), 8 out of 10 Americans consume coffee. In addition, it is estimated that half of the American population drinks coffee daily. The international market remains highly competitive. It is estimated that 3,300 cups of coffee are consumed every second of the day worldwide (Ecomall, n.d.). The latest trends included dual drinkers, an increase in senior citizens...
Caffeine is the single most widely consumed psychoactive substance in the United States (Einöther & Giesbrecht, 2013). According to Einöther and Giesbrecht (2013), 80% of the world’s population consumes caffeinated products every day, with coffee and tea being the primary sources. In the recent years, the demand for
The sample was subjected to steam distillation as illustrated in Figure 1. A total of 50ml of distillate was collected while recording the temperature for every 5.0 ml of distillate. The distillate was transferred into a 250ml Erlenmeyer flask and 3.0 g of NaCl was added. The flask was cooled and the content was transferred into a 250-ml separatory funnel. Then 25.0ml of hexane was added and the mixture was shaken for 5 minutes with occasional venting. The aqueous layer was discarded and the organic layer was left inside. About 25.0ml of 10% NaOH was then added and the mixture was shaken as before. The aqueous layer was collected and then cooled in an ice bath. It was then acidified with enough 6.00 M HCl while the pH is being monitored with red litmus paper. Another 25.0 ml of hexane was added and the mixture was shaken as before. The hexane extract was saved and a small amount of anhydrous sodium sulfate was added. The mixture was then swirled for a couple of minutes then filtered. A small amount of the final extracted was tested separately with 1% FeCl3 and Bayer’s reagent.
Sereshti, H. & Samadi, S. (2014). A rapid and simple determination of caffeine in teas, coffees and eight beverages. Food Chemistry, 158, 8-13.