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Topic: Azeotropic Distillation

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	Distillation - Wikipedia, the free encyclopedia
		The minimum in distillation is flash distillation, where either the temperature is rapidly increased or pressure reduced, and vapor and liquid fractions are thus obtained, which may be processed as such.
		The device used in distillation is referred to as a still and consists at a minimum of a reboiler (pot) in which the source material is heated, a condenser in which the heated vapor is cooled back to the liquid state, and a receiver in which the concentrated or purified liquid is collected.
		A distillation apparatus sometimes used by chemists is a rotary evaporator to distill (or evaporate) away solvent from a mixture.
	en.wikipedia.org /wiki/Distillation (714 words)

	Azeotropic distillation - Wikipedia, the free encyclopedia
		In chemistry, azeotropic distillation is any of a range of techniques used to break an azeotrope in distillation.
		A common distillation with an azeotrope is the distillation of ethanol and water.
		For the distillation of ethanol for gasoline addition, the most common means of breaking the distillation is the use of molecular sieves.
	en.wikipedia.org /wiki/Azeotropic_distillation (407 words)

	Azeotropic distillation - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-19)
		In chemistry, azeotropic distillation refers to a range of techniques used to break an azeotrope in distillation.
		It will actually be distilled to something slightly less, like 95.5% The 95.5% alcohol is then sent to a distillation column that is under a different pressure, one that pulls the azeotrope down, maybe to 93%.
		For the distillation of ethanol for gasoline addition, the most common means of breaking the distillaiton is the use of molecular sieves.
	encyclopedia.worldsearch.com /azeotropic_distillation.htm (461 words)

	Recovery of alkylene glycols - Patent 4057471
		The vapor condensate from the azeotropic distillate operation is therefore passed to a separator or decanter and the azeotroping agent-containing phase is returned as reflux to the distillation column.
		In this distillation, 95% of the ethylene glycol fed is recovered in the distillate.
		Example 1 is repeated in the manner described at 30 psig, except that 1,2,3-trimethylbenzene is used as the azeotropic distillation solvent, the reflux ratios of the ethylene glycol-containing phase are 1:1, 1.8:1, and 2.6:1, the bottoms or reboiler temperature is 230.degree.
	www.freepatentsonline.com /4057471.html (4399 words)

	Introduction to Distillation (Site not responding. Last check: 2007-10-19)
		Distillation columns are designed based on the boiling point properties of the components in the mixtures being separated.
		Thus the sizes, particularly the height, of distillation columns are determined by the vapour liquid equilibrium (VLE) data for the mixtures.
		A homogenous azeotrope cannot be separated by conventional distillation.
	lorien.ncl.ac.uk /ming/distil/distilvle.htm (429 words)

	Encyclopedia: Distillation
		Various distilled beverages in a Spanish bar A distilled beverage, also called spirits or liquor, is a preparation for consumption containing ethyl alcohol purified by distillation from a fermented substance such as wine, malt, or grain.
		Fractional distillation is the separation of a mixture of compounds by their boiling point, by heating to high enough temperatures.
		Freeze distillation is a metaphorical term for a process of enriching a solution by partially freezing it and removing frozen material that is poorer in the dissolved material than is the liquid portion left behind.
	www.nationmaster.com /encyclopedia/Distillation (1596 words)

	Purification process for silane compound - Patent 5804040
		Thus, when methoxytrimethylsilane is present during the distillation operation of a mixture of dimethoxymethylsilane and methanol, it is possible to distill off the methanol with methoxytrimethylsilane as an azeotropic mixture and to recover dimethoxymethylsilane having a boiling point of 61.degree.
		An azeotropic mixture of methoxytrimethylsilane and methanol is distilled off first as the distillate fraction since the mixture exhibits the lowest boiling point, and then after substantially all the methanol has been distilled off, dimethoxymethylsilane is distilled off as the balance fraction when the top of the column reaches a temperature of about 61.degree.
		Since the azeotropic mixture of methoxytrimethylsilane and methanol is not easily separated from dimethoxymethylsilane, the reflux ratio is considerably large, for example 100, when the azeotropic mixture is distilled off while dimethoxymethylsilane is left in the column.
	www.freepatentsonline.com /5804040.html (3167 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		The azeotropic distillation is conducted in a way that the amount of water and additive forming an azeotrope with water in the bottom stream of the distillation column is less than 1 percent by weight, preferably less than 0.1 percent by weight and most preferably less than 0.02 percent by weight in total.
		The pre-distillation prior to the azeotropic distillation or extractive distillation leads to a lower accumulation of impurities in the additive or extraction solvent recycle of said dewatering step and therefore less effort is necessary to remove said impurities, i.
		The distillate was condensed and transferred to a phase separation vessel, in that it separated to a benzene phase and an aqueous phase.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=04/00773.031231&ELEMENT_SET=DECL (4207 words)

	Solvent Distillers for the treatment
		The automatic degreasing machines, fed by chlorinated solvents, have a recycling cycle of the utilised solvents, by means of an atmospheric pressure distiller which operates in a continuous cycle.In the process residues, formed by oil, grease, metals, etc. the solvents are still present in a percentage of between 20 and 50%.
		In the distillation residues, composed of oil, grease, metals etc., the solvents are still present approximately from 20 to 50%.
		In large petrochemical plant, azeotropic vacuum distillation has been used for many years and it is still one of the most common processes to treat thermolable solvents, not mixable in water, polluted by liquid contaminants.
	www.formeco.com /azeeng.htm (331 words)

	AE-117
		The types of distillation equipment and systems that might be involved in a small fuel alcohol plant are then discussed, as are the performance and control criteria needed for a general evaluation of each.
		In the pot distillation process, the entire batch of beer is heated to boiling in a large container, and the alcohol-water vapors are collected and channeled into a distillation column.
		Most distillation processes require that the spent grain and all solids be removed from the beer before the feed is delivered to the column.
	www.ces.purdue.edu /extmedia/AE/AE-117.html (9664 words)

	Put your column on the map
		A single-feed distillation column can be designed with sufficient stages, reflux and material-balance control to produce a variety of different separations ranging from the direct mode operation (pure low-boiling node taken as distillate) to the indirect mode of operation (pure high-boiling node taken as bottoms).
		The exact shape of the reachable composition space is further limited by the requirement that the distillate and bottoms lie on the same residue curve (i.e., in the same distillation region) and by the material balance constraint that distillate and bottoms be colinear with the feed.
		A convenient distillate composition in the two-phase LLE region is the ternary azeotrope, which is the low-boiling node in all distillation regions.
	www.chemicalprocessing.com /articles/2004/208.html (2649 words)

	The Distillation Group, Inc. Distillation
		Azeotropic systems are those where the vapor and the liquid reach the same composition at some point in the distillation.
		Azeotropic distillation uses a MSA that forms a minimum boiling azeotrope with some of the feed components is used.
		The azeotrope is taken overhead and the MSA rich phase decanted and returned to the column as reflux.
	www.distillationgroup.com /distill.htm (2049 words)

	ChemSep Nonequilibrium Modeling
		The acetone and the pure cyclohexane are recovered from this azeotrope with a water wash, followed by a simple distillation that produces water and acetone for recycling.
		Azeotropic distillation of benzene and cyclohexane with acetone as entrainer, and a water wash for entrainer recovery.
		Pseudo binary McCabe-Thiele diagram for the azeotropic distillation of benzene and cyclohexane.
	people.clarkson.edu /~chengweb/faculty/taylor/chemsep/neqpaper.html (1671 words)

	Azeotropic Distillation equipment
		In the distillation process residues, formed by oil, grease, metals, etc., the solvents are still present in a percentage of between 20 and 50%.
		This high percentage is due to the thermolability of the chlorinated solvents, not allowing a forced distillation which can cause their acidification.
		A notable improvement is achieved by vacuum distillation, which enables to lower this percentage to between 5 and 8%.
	www.brassfoundry.cc /azeotropic_distillation_ipa.html (332 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		An azeotrope is a mixture of two liquids that boils without any change in composition at a significantly lower temperature than its constituents.
		In the case of toluene, the azeotrope has a boiling point of 84.1 degrees C while water boils at 100 degrees C and toluene at 110 degrees C. At room temperature, the toluene separates and floats on top of the water.
		Distillation is continued until the toluene over the water in the collector goes from cloudy to clear and the water level stays constant.
	www.science.uwaterloo.ca /~rkhmskrk/tp03.html (311 words)

	Extraction Procedures
		The avoidance of simple distillation to perform this separation stems from the relative volatility between water and acetic acid being very close to unity and the higher volatility of water (meaning that all the water must be taken over head) leading to large energy costs per unit of acetic acid recovered.
		This is done after solvent regeneration, but again the low volatility of water relative to acetic acid makes it difficult to carry out by simple distillation and as such azeotropic distillation is the usual means of removing water from the extracted acid.
		This can be performed by adding a separate entrainer and carrying the azeotropic distillation out in a separate tower following solvent regeneration but if often makes sense to choose a solvent for extraction that itself can serve effectively as the entrainer for the azeotropic distillation.
	www.stevens-tech.edu /engineering/cbme/UG/sdp/project/LiquidToLiquid/Extraction.html (995 words)

	Chemical Process Control Group
		Azeotropic distillation is one of the most widely used and important separation processes in the oil and chemical industries.
		For example, the total energy consumption of the distillation columns in operation in the U.S.A. is more than three times as high as the total energy consumption of Switzerland.
		The steady state and dynamic behavior of azeotropic distillation has been studied extensively over the past decades, since this understanding is a necessary prerequisite for proper column design and operation.
	control.ee.ethz.ch /~disti/intro.php (272 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Recent and ongoing research in the distillation of nonideal mixtures is reviewed focusing on advances in the methodologies for the synthesis, design, analysis and control of separation sequences involving homogeneous and heterogeneous azeotropic towers.
		Maps of residue curves and distillation lines are examined, as well as geometric methods for the synthesis and design of separation sequences, trends in the steady-state and dynamic analysis of homogeneous and heterogeneous towers, the nonlinear behavior of these towers, and strategies for their control.
		Emphasis is placed on the methods of computing all of the azeotropes associated with a multicomponent mixture, on the features that distinguish azeotropic distillations from their zeotropic counterparts, on the potential for steady-state multiplicity, and on the existence of maximum and minimum reflux bounds.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=201433 (335 words)

	Encyclopedia: Azeotropic Distillation
		Strathisla whisky distillery in Keith, Scotland Distillation is a means of separating liquids through differences in their vapor pressures.
		Ethanol, also known as ethyl alcohol or grain alcohol, is a flammable, colorless chemical compound, one of the alcohols that is most often found in alcoholic beverages.
		Pressure (symbol: p) quantifies the intensity of a force acting on a surface in a direction perpendicular to that surface.
	www.nationmaster.com /encyclopedia/Azeotropic-Distillation (726 words)

	INTRODUCTION
		Among these, distillation by far is the most widespread and has a long history in Chemical Technology.
		The approach is suitable for simple as well as complex mixtures and can replace attempts being made to understand azeotropic, extractive and reactive systems as separate and mysterious topics.
		The ideas developed for distillation systems can be extended to other technologies such as extraction and absorption.
	www.iitb.ac.in /~cep/brochures/mahajani-distill-bro.html (494 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		"Azeotropic distillation"refers to a type of distillation in which a substance is added to the mixture to be separated in order to form an azeotropic mixture with one or more of the constituents of the original mixture.
		Typically, the azeotropic mixture is heated to a temperature at which the solvate/water is driven off of Form II.
		In the azeotropic distillation, it will be the boiling point at which the solvate and/or water has been driven off.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/53293.010726&ELEMENT_SET=DECL (3317 words)

	Extractive distillation (Site not responding. Last check: 2007-10-19)
		Mixtures having a low relative volatility can not be separated by simple distillation because the volatility of both the components in the mixture is nearly the same causing them to evaporate at nearly the same temperature to a similar extent, whereby reducing the chances of separating either by condensation.
		The method of extractive distillation uses a solvent, which is generally nonvolatile, has a high boiling point and is miscible with the mixture but doesnt form an azeotropic mixture.
		A very essential part of this type of distillation is the selection of the solvent, which plays the role of separating the two components.
	read-and-go.hopto.org /Distillation/Extractive-distillation.html (315 words)

	Untitled Document (Site not responding. Last check: 2007-10-19)
		The course is aimed at process engineers who have experience of conventional distillation and wish to learn more about non-ideal distillation processes.
		Azeotropic distillation methods are required when separating mixtures that form azeotropes.
		Residue curves and the representation of heterogeneous distillation on ternary diagrams.
	www.cpi.umist.ac.uk /Courses/shortcourses/Azeo.asp (215 words)

	Introduction to Distillation (Site not responding. Last check: 2007-10-19)
		There are many types of distillation columns, each designed to perform specific types of separations, and each design differs in terms of complexity.
		One way of classifying distillation column type is to look at how they are operated.
		That is, the column is charged with a 'batch' and then the distillation process is carried out.
	lorien.ncl.ac.uk /ming/distil/distiltyp.htm (249 words)

	The University of Manchester (Site not responding. Last check: 2007-10-19)
		Azeotropic distillation is required to separate mixtures that form azeotropes.
		Flowsheets involving liquid-liquid phase splitting and the use of complex distillation alternatives are the subject of future research.
		For multicomponent mixtures, new methods for the synthesis and evaluation of azeotropic distillation sequences have been developed.
	www.ceas.manchester.ac.uk /research/researchcentres/centreforprocessintegration/researchtopics/energyefficiency/azeotropicdistillation (343 words)

	LPT: Heterogeneous Azeotropic Distillation
		The objective of this study is to improve the operability of heterogeneous azeotropic distillation processes.
		In many applications extractive distillation has severe disadvantages due to a combination of a high energy consumption and a high temperature level, on which the heat has to be supplied to the process.
		However, for general three phase (VLL) distillation processes in a tray column the interaction between two liquid phases, continuous and disperse, must be modelled as equilibrium while for the mass and heat transfer between vapor phase and continuous liquid phase the rate-based approach is more appropriate.
	www.lpt.rwth-aachen.de /Research/Completed/azeotropic.php (1154 words)

	The University of Manchester (Site not responding. Last check: 2007-10-19)
		This course unit examines the range of separations that are available, focusing on design of distillation systems, including distillation of azeotropic mixtures.
		Distillation is a well-established and mature technology that is very widely used in the chemical process industries.
		The sequencing of distillation columns and the appropriate use of complex distillation arrangements can bring remarkable reductions in energy costs and, in new design, reduction in capital costs also.
	www.ceas.manchester.ac.uk /studyhere/postgraduatetaught/programmes/mscadvancedchemicalprocessdesignft/separationsystemsdesignmodule (391 words)

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