furan

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furan:

see furfuralfurfural
or furfuraldehyde
[Lat.,=bran], C4H3OCHO, viscous, colorless liquid that has a pleasant aromatic odor; upon exposure to air it turns dark brown or black. It boils at about 160°C;.
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Furan

 

(furfuran), a heterocyclic compound; a colorless liquid, with a chloroform odor and a boiling point of 31.33°C. A large group of organic compounds, many of which are of practical

value, are derived from furan, for example, furfural, tetrahydrofuran, and 2-methylfuran. Furan is obtained primarily from furfural. It is an intermediate product in the synthesis of tetrahydrofuran; it is also used in the preparation of pyrrole, by a reaction with NH3 in the presence of Al2O3.

furan

[′fyu̇r‚an]
(organic chemistry)
One of a group of organic heterocyclic compounds containing a diunsaturated ring of four carbon atoms and one oxygen atom.
C4H4O4 The simplest furan type of molecule; a colorless, mildly toxic liquid, boiling at 32°C, insoluble in water, soluble in alcohol and ether; used as a chemical intermediate. Also known as furfuran; tetrol.
References in periodicals archive ?
amp;nbsp; The longer that coffee is exposed to the air in cups or jugs, meanwhile, the more the furan evaporates.
Dioxins and furans have relatively long half-lives in human blood; therefore, sampling human blood can be used to assess historical exposure.
1997) of dioxins and furans in oysters collected as part of a market-basket assessment of food products from southern Mississippi.
As countries become more industrialized, you're going to have more dioxins and furans being produced, which is a great concern, because these chemicals are very toxic," Allsopp said.
Another dramatic difference is that gasifiers produce a "syngas" free of dioxins and furan compounds.
When first drafted in 2000, this treaty looked to curb what many scientists referred to as the dirty dozen: dioxins, furans, polychlorinated biphenyls (PCBs), and the pesticides aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, hexachlorobenzene, mirex, and toxaphene (SN: 12/16/00, p.
The only way to ensure that incineration produces no dioxins and furans (or only insignificant amounts) is to use modern incinerators that function at 800[degrees]C to 1,000[degrees]C, with special emission-cleaning equipment.
Farmers and Parmalat express concern that escaping inadvertent stack emissions containing dioxins and furans from the incinerator could conceivably wind up in livestock feed and eventually work their way up the food chain, and over time through to milk and meat products.
Chlorine-gas-based paper-bleaching processes release dioxins and furans, which the Environmental Protection Agency (EPA) lists as "priority persistent bioaccumulative and toxic chemicals.
Burning or pyrolysis of WEEE resulted in toxic emissions such as dioxins and furans.
Semi-continuous monitoring campaigns of emissions of dioxins and furans.
According to EU Regulation 2002/32, the legal limit for the presence of dioxins and furans in feed materials is 0.