How To Use Furfural In A Sentence
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Hydroxymethyl furfural ( 5 - HMF ) is an index compound for beer stalking.
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But we shall require also to deal with the constituent groups of the complex, which for the purposes of this discussion may be regarded as (a) a cellulose of normal characteristics -- cellulose alpha; (b) a cellulose yielding furfural on boiling with condensing acids -- cellulose beta; and (c) a much condensed, and in part benzenoid, group which we may continue to term the lig_none_ group.
Researches on Cellulose 1895-1900
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The yield of furfuraldehyde by the breaking down of arabin and metarabin was thought possibly to be of some value in differentiating the natural gums from one another, but we have not succeeded in obtaining results of much value.
Scientific American Supplement, No. 821, September 26, 1891
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The latter also, when distilled with hydrochloric acid, yields a larger proportion of furfuraldehyde than is obtained from nitrocellulose and nitrohydrocellulose.
Researches on Cellulose 1895-1900
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Allied to the normal Yielding furfural One-third of which celluloses approximately 50 p.ct. is of benzenoid type
Researches on Cellulose 1895-1900
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Glucose loses two water molecules and rearranges to form hydroxymethyl furfural, which polymerizes into brown pigments that add flavor and color to the candy.
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HCl it gave 15.3 p.ct. furfural; oxidised with nitric acid it yielded 10.4 p.ct. mucic acid.
Researches on Cellulose 1895-1900
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Although furfuraldehyde is the natural decomposition product of pentosans, furfuryl alcohol is the main furane body of coffee aroma.
All About Coffee
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The liquor undergoes a process of further evaporation and fermentation to remove volatile compounds like methanol, furfural and ethanol.
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The yield of furfuraldehyde by the breaking down of arabin and metarabin was thought possibly to be of some value in differentiating the natural gums from one another, but we have not succeeded in obtaining results of much value.
Scientific American Supplement, No. 821, September 26, 1891
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By secondary reactions they may yield some furfural, but as they are highly reactive compounds, and most readily condensed, they are for the most part converted into complex 'tarry' products.
Researches on Cellulose 1895-1900
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It is generally believed that non-enzymic browning involves an initial condensation of amino-acids with the active carbonyl group of reducing sugars (the Maillard reaction) or furfuraldehydes derived from sugars or sugar-acids.
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The percentage yields of furfuraldehyde obtained from these fractions were as follows: A, insoluble, 0.86; precipitated, 4.35; dissolved, 1.10.
Researches on Cellulose 1895-1900
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The tint obtained with the standard was then compared with that yielded by the gum distillate from which the respective ratios of furfuraldehyde are obtained.
Scientific American Supplement, No. 821, September 26, 1891
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Hydroxymethyl furfural ( 5 - HMF ) is an index compound for beer stalking.
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Preparation of wood - based furfural acetone resin is an advanced utilization of wood residues.
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Carbon or graphite matrices will be formed using suitable liquid organic precursors, includingphenolic resins, epoxies, polyesters, polyamides, polyimides, furfuraldehydes, liquid pitch, and most other thermoplastic and thermosetting resins.
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Quantitative analysis, by means of gas chromatography-mass spectrometry, identified guaiacol, 4-methylguaiacol, 4-ethylguaiacol, 4-ethylphenol, eugenol, and furfural in each of the wines made from smoked grapes.
When Smoke Gets in Your Grapes
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The yields of furfuraldehyde would appear to have no definite relation to the other chemical data about a gum, such as the potash and baryta absorptions or the sugar produced on inversion.
Scientific American Supplement, No. 821, September 26, 1891
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It appears, from the foregoing results, that the cellulose molecule, after oxidation, is easily decomposed by potash, the insoluble and larger portion having all the characters of the original cellulose, whilst the soluble portion is of an aldehydic nature, and contains a substance, precipitable by acids, which yields a relatively large amount of furfuraldehyde.
Researches on Cellulose 1895-1900
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Furfural reacts with phenols, ketones, and esters as an aldehyde; removal of the aldehyde group yields furan, which is converted to tetrahydrofuran, used in the manufacture of nylon.
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The process occurred by electrochemical oxidation of furfural under current or potential control.
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Johann Doebereiner,, a German chemist accidentally discovered furfural in 1832 when he treated sugar with sulfuric acid and manganese dioxide.
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The interior electrolytic process can greatly improved the biochemical capability of furfural wastewater.
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This suggests that the reaction takes place in the water phase and that substituted furfurals enter this phase only with difficulty.
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Lastly, this is the simplest transition yet disclosed from the succinyl to furfural grouping, being effected by a regulated proportion of oxygen, and under conditions of reaction which may be described as of the mildest.
Researches on Cellulose 1895-1900
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After this period of time, further treating did not increase the amount of furfuraldehyde produced.
Scientific American Supplement, No. 821, September 26, 1891
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Glucose loses two water molecules and rearranges to form hydroxymethyl furfural, which polymerizes into brown pigments that add flavor and color to the candy.
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Furfural from cellulose, oxycellulose, and hydrocellulose, 70; derivative from lævulose, 8; estimation as hydrazone and phloroglucide, 119, 121; oxidation of, 114, 118 (_refer also_ 'Pentosanes')
Researches on Cellulose 1895-1900
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In recent years it has been shown that reductones, furfurals and other related substances formed in heated milk are sugar fission products 1,2.
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The neutral or very faintly alkaline solution was then distilled almost to dryness, when practically the whole of the furfuraldehyde comes over.
Scientific American Supplement, No. 821, September 26, 1891
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However, such conditions also result in the formation of furfurals from glucose and xylose.
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From these and some other substances, the following percentage yields of furfuraldehyde were obtained: Hydrocellulose, 0.854; oxycellulose, 2.113; reduced cellulose,
Researches on Cellulose 1895-1900
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Although furfuraldehyde is the natural decomposition product of pentosans, furfuryl alcohol is the main furane body of coffee aroma.
All About Coffee
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He considers the roasting of coffee as a destructive distillation process, summarizing the results, briefly, as the production of furfuraldehyde from the carbohydrates, acrolein from the fats, catechol and pyrogallol from the tannins, and ammonia, amins, and pyrrols from the proteins.
All About Coffee
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On the toxicity of furfural, I quoted from page 109 of the scoping report: ‘A particular chemical of concern that will be produced by the plant is furfural.’
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The once-through yield of furfuryl alcohol is greater than 90%, and the outlet mixture contains no any unreacted furfural.
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Or we could use all those phenyl rings in the lignin in lignocellulosic biomass to make hydrocarbons: or dehydrate sugars to furfurals using ionic liquids.
Rabett Run
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The production sequence is hydrogenation deacidification → furfural refine → hydrotreating ( refined ) or clay refine.
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Definitive anti-dumping duty on furfuraldehyde originating in the mainland of China has been imposed since 22 January 1995.
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Furfural reacts with phenols, ketones, and esters as an aldehyde; removal of the aldehyde group yields furan, which is converted to tetrahydrofuran, used in the manufacture of nylon.
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This research concentrates mainly on the market potential for furfural and phenolic compounds and examines some of the features of new processing technologies that offer cost advantages.
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Upon further heating, the sucrose forms hydroxymethyl furfural, which polymerizes into a the brown pigments that give color and flavor to the brittle.
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Aldoses generally exist in solution as pyranoses, whereas ketoses generally exist as furanoses, hence the ability of ketoses to rapidly dehydrate to yield furfurals.
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Furfural - also called furfuraldehyde, fural, 2-furaldehyde, pyromucic aldehyde, or 2-furancarboxaldehyde - is a viscous, colorless liquid with a freezing point of - 37.6°F and a boiling point of 323°F.
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The furfurals, for instance, which have a bitter flavour when originally extracted, are transformed by the yeasts into compounds which have a range of flavours from smoked meat to leather.
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FURFURAL ANILINE: A resin formed from furfural and aniline, which is a cyclic amine derived from benzene, and is nowadays obtained from coal.
Chapter 11