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Material added to odorless fuel gases to give them a distinctive odor for safety purposes; usually a sulfur- or mercaptan-containing compound. Also known as malodorant; stench; warning agent.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a substance added to a gas to impart a distinctive odor to it, mainly for safety purposes. Odorants should be physiologically harmless, nonaggressive with respect to metals and materials used in the construction of gas pipeline networks and devices, and inert to the components of the gas being odorized or to impurities in the gas, and they should not condense under operating conditions. They are usually sulfur-containing compounds; according to composition, a distinction is made between mercaptan odorants (Captan, Calodorant, methyl mercaptan, and ethyl mercaptan) and sulfide odorants (diethyl sulfide, dimethyl sulfide, dimethyl disulfide, and tetrahydrothiophene).

Industrial ethyl mercaptan (C2H5SH), which is characterized by a sharp, unpleasant odor sometimes resembling that of rotten cabbage, is used in the USSR for odorization of natural, shale, and liquefied hydrocarbon gases. As of 1974, work was under way on the introduction of Sul’fan, a high-mercaptan-content odorant composed of unpleasant-smelling organic sulfur compounds that are waste products of sulfate boiling of cellulose. In 1972 a mixture of natural mercaptans present in the gas condensate at the Orenburg gas-condensate deposit (USSR) was proposed for industrial use. Among the odorants used in the USA are petroleum odorants (Pentalarm, composed of ethyl mercaptan and n-amyl mercaptan; Captan, basically a mixture of butyl mercaptans; and Calodorant, containing sulfur almost entirely in the sulfide and disulfide forms), tetrahydrothiophene, and odorants consisting of mixtures of tert-butyl mercaptan or dimethyl sulfide.

Substances used for deodorizing are called deodorants; they include charcoal, chlorinated lime solution, potassium permanganate, and hydrogen peroxide. The use of mixtures of several odorants, which produce a stronger and more stable odor than the individual components, was planned as of 1974.


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The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Although the biochemical synthetic pathway leading to aroma production in rice has not been recognized completely yet but the recessive condition of aroma allele (badh2/badh2) and the accumulation of aroma compounds due to the loss of function of dominant Badh2 allele (Bradbury et al., 2005; Chen et al., 2008) were well explained by the present experiment (Table 4).
[8] reported this 'Swallow-breath' as the main source of aroma compounds in the nasal cavity originating via the retronasal route.
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Ilangantileke, "Comparison of aroma compound 2-acetyl-1-pyrroline in leaves from pandan," Cereal Chemistry, vol.
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Flavor is one of the most important qualities of O.J., and aroma compounds are significantly responsible for the fresh-squeezed taste consumers prefer.
2011 "Influence of pH and ethanol on malolactic fermentation and volatile aroma compound composition in white wines." LWT--Food Sci Technol.
(Aromatic index: concentration of the aroma compound in the wine, divided by its sensory threshold.)
Eugenol is the main aroma compound found in cloves.
As an investigative story, the hunt for what causes eucalyptus character--and the origin of its aroma compound 1,8-cineole--in wine has the makings of a classic whodunit.
Vanillin Vanillin, the main aroma compound in natural vanilla, is also present in raw oak.