| 单词 | fractional distillation |
| 例句 | Ethylene, C2H4, a byproduct from the fractional distillation of petroleum, is fourth among the 50 chemical compounds produced commercially in the largest quantities. Chemistry 2019-02-14T00:00:00Z Instead of exploring fundamentals like the solar system, Leo delves into the nuances of oil refining, teaching kids as young as eight about “fractional distillation” and “residuals.” Pipeline to the classroom: how big oil promotes fossil fuels to America's children 2017-06-15T04:00:00Z If you clean, through fractional distillation, the coolant in the equipment, you restore it to its previous - identical to brand new- chemical composition. How the Chemical Industry Joined the Fight Against Climate Change 2016-10-16T04:00:00Z A volatile, very inflammable liquid, C6H6, contained in the naphtha produced by the destructive distillation of coal, from which it is separated by fractional distillation. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z Mond gas is produced in generators of the blowing or pressure type from bituminous coal, necessitating the employment of special purifiers and permitting the collection of the by-products of the fractional distillation of the coal. Gas-Engines and Producer-Gas Plants A Practice Treatise Setting Forth the Principles of Gas-Engines and Producer Design, the Selection and Installation of an Engine, Conditions of Perfect Operation, Producer-Gas Engines and Their Possibilities, the Care of Gas-Engines and Producer-Gas Plants, with a Chapter on Volatile Hydrocarbon and Oil Engines 2011-12-28T03:00:31.087Z Argon, neon, krypton, and xenon come from the fractional distillation of liquid air. Chemistry 2019-02-14T00:00:00Z By the process of fractional distillation mineral oils of all grades can be obtained. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z The first step in the operations is fractional distillation, after the manner just described for petroleum. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z From the tar distillate, the chrysene can be fractionally precipitated, and the fluoranthene can be separated from most of the pyrene by fractional distillation in a partial vacuum. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z Trimethyleneglycol is more volatile than glycerine and can therefore be concentrated by fractional distillation. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. The main source of these liquid alkane fuels is crude oil, a complex mixture that is separated by fractional distillation. Chemistry 2019-02-14T00:00:00Z The alkaline solution, on being drawn off and made acid, yields its mixture of phenols in the form of a dark oil from which carbolic acid is separated by a laborious series of fractional distillations. Coal and What We Get from It Nitrogen, oxygen, argon, helium, krypton, neon and xenon can all be separated each from the others in this way, by "fractional distillation." Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z It is obtained from the higher boiling fractions, after separation of naphthalene and anthracene, by fractional distillation, the portion boiling between 290-340� C. being taken. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z This layer is separated, and the phenol recovered by a process of fractional distillation. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" They are extracted together with volatile oils by distilling certain plants with steam, the volatile oils being subsequently separated by fractional distillation. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 2 "Camorra" to "Cape Colony" The process is what chemists would call a rough fractional distillation. Coal and What We Get from It In an earlier chapter we saw how petroleum can be separated into its various constituents, such as petrol, by fractional distillation, advantage being taken of the difference in the "boiling-point" of the various "fractions." Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z If a complex mixture be operated upon, and a separation effected by collecting the distillates in several portions, the operation is termed “fractional distillation.” Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" The crude cresol obtained from tar cannot be separated into its different constituents by fractional distillation, since the boiling points of the three isomers are very close together. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" This is filtered, and the remainder, about 20% of the total, which is retained in solution, is extracted by fractional distillation and cooling the distillate. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 2 "Camorra" to "Cape Colony" The process of purification is thus far one of fractional distillation combined with chemical washing. Coal and What We Get from It This process is known as fractional distillation, and it will be noticed that it consists essentially in collecting and liquefying separately those vapours which are given off at different ranges of temperature. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z Fractional Distillation.—By fractional distillation is meant the separation of a mixture having components which boil at neighbouring temperatures. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" And it was most assuredly in Hofmann’s London laboratory that Charles Mansfield worked out that method of fractional distillation of the coal-tar and of isolating the single hydrocarbons which laid the foundation of that industry. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" I don't know what you call it, the device, but in the trade it is a pot still used for fractional distillation. The Ethical Engineer The principle of fractional distillation has already been explained sufficiently for our present purpose. Coal and What We Get from It "Well, I guess you might remotely compare it to fractional distillation," I said. Jack of No Trades The theory of fractional distillation, or the behaviour of liquid mixtures when heated to their boiling-points, is more complex. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" Sealing compound is a combination of heavy residues produced by the fractional distillation of petroleum. The Automobile Storage Battery Its Care And Repair The pure acid may be obtained by fractional distillation as a colourless liquid of very unpleasant smell, boiling at 30� C., and extremely explosive. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" The undissolved hydrocarbon is similarly purified by fractional distillation, and furnishes the solid crystalline naphthalene. Coal and What We Get from It This process is called "fractional distillation," and the various products are called "fractions." Diggers in the Earth For this purpose, 100 c.c. of the oil is placed in a Ladenburg fractional distillation flask, and 90 c.c. distilled off under a pressure of not more than 40 mm., and the residue steam distilled. The Handbook of Soap Manufacture The alcohol remains in the flask A and may be separated by fractional distillation. An Elementary Study of Chemistry The various components are sorted out by fractional distillation and the oil for burning in lamps is selected according to its volatility, viscosity, stability, etc. Artificial Light Its Influence upon Civilization Mr Prentice says: "I may point out that while the ordinary process of making nitric acid is one of fractional distillation by time, mine is fractional distillation by space." Nitro-Explosives: A Practical Treatise This apparatus was the forerunner of that used to-day, for effecting the separation of liquids which boil at different temperatures, by the process called fractional distillation. The Story of Alchemy and the Beginnings of Chemistry Thus, by the continued operation of the chemical process known as fractional distillation of the immediate products of coal-tar, these various series of useful oils are prepared. The Story of a Piece of Coal What It Is, Whence It Comes, and Whither It Goes The resulting alcohol is separated by fractional distillation. An Elementary Study of Chemistry In this fractional distillation a vast variety of products are now obtained. Artificial Light Its Influence upon Civilization It is possible that the elimination of these gases takes the form of fractional distillation, and definite compounds may be formed directly from the wood-tissue or its derivatives, and mingle as they escape. Scientific American Supplement, No. 362, December 9, 1882 It is difficult to isolate, by means of fractional distillation, definite products with constant boiling points. Scientific American Supplement, No. 288, July 9, 1881 The distillation and rectification of aniline oil is practised on a similar principle to the fractional distillation which we have noticed as being used for the distillation of the naphthas. The Story of a Piece of Coal What It Is, Whence It Comes, and Whither It Goes The process of separating a mixture of volatile substances by distillation is known as fractional distillation. An Elementary Study of Chemistry Thus treated rosin spirit furnishes about one-fourth of its volume of a colorless mobile liquid, which after long-continued fractional distillation is resolved into a variety of fractions boiling at temperatures from 95° to over 180°. Scientific American Supplement, No. 275, April 9, 1881 The ethers are returned as ethyl acetate, but from fractional distillation amyl acetate was found to be present. Travels in West Africa It boils at 78 degrees, vaporizing 22 degrees lower than water, from which it can be separated by fractional distillation. An Introduction to Chemical Science Purification of the product is afterwards carried out by a process of fractional distillation. The Story of a Piece of Coal What It Is, Whence It Comes, and Whither It Goes It is possible to separate the dioxide from the water by fractional distillation. An Elementary Study of Chemistry In this process the petroleum is run into large iron stills and subjected to fractional distillation. An Elementary Study of Chemistry |
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