Introduction Having an efficient and reliable system for oil-water separation is of crucial importance especially for offshore oil and gas industry. Due to the platform movement, space, weight and operating limitations in offshore, the usage of common methods (gravity based vessels) for oil/water separation are ineffective. On the other hand producing oil is often accompanied by large amount of water that is discharged into the sea on offshore platforms. The amount of oil in water is confined from environmental standards. Therefore the need to have a high efficiency compact separator during variable operating conditions attracts the interests of researchers to hydrocyclones. Special trait of hydrocyclones such as simple design, easy to install and operate, no moving parts, and low manufacturing and maintenance costs make hydrocyclones as an economical and effective system for produced water treatment [1-2]. The separation process that is occurred in the deoiling hydrocyclones is quite different from that in the desander ones []. The density difference between liquid-liquid is smaller than solid-liquid mixtures. Therefore the separation of liquid from liquid is more difficult than solid from liquid and needs higher rotational speeds. The liquid droplet in comparison with solid particles could not experience shear rates. If the shear rates increase to the critical level the larger droplet break down to the smaller ones. The separation process for small liquid droplets is more difficult than large ones. On the other hand if two droplets close enough they might coalesce to each other. Because of difference in flow split of desander and deoiler hydrocyclones, the flow feature of continuous phase is different in these two types. The centrifugal forces cause the solid particles migrate to the wall region in desander hydrocyclones. So the near wall region is important in desander hydrocyclones but the oil droplet migrate to the center of hydrocyclones in deoiling hydrocyclones and the consideration tends to the center flow features. The first idea of using common hydrocyclones for oil-water separation was suggested by Simkin and Olney [6] and Sheng et al. [7] but fundamental studies on deoiling hydrocyclones started from 1980 by Colman [8] and Thew. Several experimental researches on deoiling hydrocyclones were conducted by Colman et al. [9] and Colman and Thew [10-12]. Their results showed that the separation efficiency of hydrocyclones is independent of flow split between 0.5 to 10 percent. So the overflow diameter should design based on working conditions. Moreover for constant droplet size distribution in inlet, the size distribution in outlet is independent of flow split.
Compounds resulting from heterocyclic chemistry form a huge family of variations of organic compounds with cyclic or acyclic structures having carbons and at least another element with the most common being sulfur, oxygen, fluorine or nitrogen 49. Such heterocyclic compounds must have their rings having heteroatoms and the rings could be unsaturated or saturated as well 1. These compounds are usually classified as aromatic or alicyclic heterocycles 6. The latter contain cyclic analogues of thioethers, ethers and amines 6. It has been studied before that the families of nitrogen- sulfur heterocycles have aromatic compounds that are very stable19. Also, fluorinated compound using trifluoromethyl group is often used to reduce in vivo metabolism of potential drugs, in addition to improving cellular membrane permeability (LogP)88. Sulfur and Nitrogen organic compounds heterocycles are basically drawn from aromatic heterocycles realized when a heteroatom occupies the position of a carbon atom in the ring of an organic aromatic
Fig. 2(A) shows the phase diagrams of IPM, water, and surfactant mixtures at the ratios of 60:40, 65:35, and 70:30 (v/v), respectively. Fig. 2(B) shows the phase diagrams of ethyl oleate, water, and surfactant mixtures at ratios of 90:10, 95:5 and 100:0, respectively. Filled circles mean self-emulsifying points, and black areas represent the self-emulsifying regions. In other area, the compositions showed inverted emulsion, gel-like form, or phase-separation. In general, when the oil content in the oil and surfactant mixtures is ≤30%, the condition of the mixtures changed from water-in-oil emulsion to a clear gel-like form and then to microemulsion. Otherwise, the dispersions showed phase separation, this result was similar to the results previously studied by Guo et al. [16]. Our finding showed that IPM + surfactant mixture (65:35, v/v) and ethyl oleate + surfactant mixture (90:10, v/v) showed the most self-emulsifying regions (Fig. 2). Overall, in contrast to IPM + surfactant mixture (65:35, v/v), ethyl oleate + surfactant mixture (90:10, v/v) showed finer emulsion in larger self-emulsifying range. These results indicate that ethyl oleate and Tween 80:Carbitol (90:10, v/v) were identified as the optimal oil
A convenient method of separating a mixture of organic compounds is recognized as liquid-liquid extraction, which involves the dispersion of a substance between two immiscible solvents using preferential solubility. Strategically using the differences in solubility of the interested solute, the compound can be transferred from one liquid part to the other during extraction. Organic acids and bases can be separated from each other by using an organic solvent like diethyl ether and a polar solvent such as water. Diethyl ether is an appropriate solvent since it wil...
The water concentration is now even on the inside and out. This process is called osmosis. Part B: Aim: To investigate the action of a differentially permeable membrane. Method: See attached.
Clean water involves seclusion of lakes and hoping the acid rain does not reach these pure water supplies. Another major source of contaminating clean water are oil spills and how destructively they blanket the shoreline they come in contact with. Although offshore drilling expeditions contribute some to the devastating outcome, oil tankers are the superior enemies toward the water. One estimate is that for every one million tons of petroleum shipped one ton is spilled. The largest super tanker spill was in 1979 when 3.3 million barrels was spilled off the coast of France. The largest in the United States was the Exxon Valdez in the gulf of Alaska. On the night of March 24, 1989 the 987 foot Exxon Valdez ran aground in the gulf of Alaska spilling 260,000 barrels of oil. With the help of the forceful winds, the slick soon covered about 1,100 miles of shoreline, including many islands in the sound.
Upon extraction, the crude oil is transferred to a refinery. This is normally done either by pipeline or supertanker ships that are up 1500 feet in ...
The process of oil pulling is relatively simple. What’s important to remember is the technique and to practice consistency.
If one compared the IR spectrum of the product to the starting material, 2-methylcyclohexanol, one could clearly see the change in peak size of the O-H stretch. The infrared spectrum of 1-methylcyclohexene also depicted a C-H stretch and an alkene functional group at 500-1500 cm-1 and 2932.54cm-1, respectively. From the gas chromatography spectrum (Data Table 4), the area percentages show that there were three products - peaks 22 through 24 - that were formed from the dehydration experiment. Nevertheless, there are two predominant products, as shown from their high percentages, 3-methylcyclohexene (~24%) and 1-methylcyclohexene
All chromatography involves the stationary phase and the mobile phase. After injection of a mixture, separation is achieved in the capillary column. This column is coated with a fluid or a solid support, the stationary phase The carrier gas (mobile phase) propels the sample down the column where the separation process occurs. The use of flow meters and pressure gauges are helpful to maintain constant gas flow. As the carrier gas plays an important role it is best that it is dry, free of oxygen and that it does not react with the sample or column. There are different types of columns used packed columns and capillary columns; the capillary is more commonly used as a only a small sample is need and it analyses faster. This will be essential to produce strong and accurate results. Hydrogen (H) generally is a good carrier gas but; it may react and convert the sample into another substance. The choice of carrier gas may hinge on the ...
The performance curves based on the ethylene glycol solution will be compared to those developed using water as the base to examine the effect, if any, the viscosity and density of the liquid has on the pump.
Chromatography is the technical term for a set of laboratory approaches for the separation of mixtures (Solid/Liquid/Gas). The mixture is dissolved in a fluid which called the mobile phase, which carries it through a structure holding another material known as the stationary phase. The various constituents of the mixture transport at different velocities, causing them to separate. The separation is mainly based on differential partitioning between the mobile and it’s stationary phases. Subtle differences in a compound's partition coefficient result in differential retention time on the stationary phase and thus changing the separation (Tomer, et al., 1994).
The effect of Temperature of liquid on flow rate. - the effect of Temperature on liquid flow (turbulent/laminar) 3) The effect of the Vertical height between source and destination of the fluid on flow rate. - the effect of Vertical height on liquid flow (turbulent/laminar) 4) The effect of the Liquid's Viscosity/Density on flow rate.
Osmosis is a physical phenomenon that has been studied by scientists of various disciplines of science and engineering. Osmosis is a natural equilibrium process and forward osmosis is one of many types of osmosis processes. It works by having two solutions with different concentrations separated by a selectively permeable membrane and ‘pure’ water flows from less concentrated solution across the membrane to dilute the more concentrated solution, leaving the salts behind. The clue in the potential applications is widely used in nature, however only recently that its potential has begun to be recognised industrially and with the progress in membrane and draw solutes science in the last few decades, the research and industrialization of engineered applications of osmosis has been increased exponentially. Osmosis, or currently referred to as forward osmosis, has new applications in separation processes for wastewater treatment and seawater or brackish water desalination. Other areas of forward osmosis research
Liquids have no definite shape. Liquids are less orderly than solids but more orderly than gases. Liquids can flow very easily. Liquids also take the shape of their container.
10. A packed fractionating column is more efficient than an unpacked one because a packed column provides more surface area for the vapor to condense on. The more it condenses, the more efficient the separation of the liquids.