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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.



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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References in periodicals archive ?
In summary, we propose that odorant mediation of flicking behavior requires both the aesthetasc and nonaesthetasc pathways.
Experimental results show that, as a class, the sulfide odorants have larger adsorption enthalpies on clay and organo-clay surfaces than the thiol odorants.
Work in North Carolina indicates that the odor is not only a nuisance but that it can also cause health problems," Rudek says, citing research published in the Spring 1998 issue of the Journal of Animal Science by Susan Schiffman, a psychiatrist at Duke University Medical Center, who found that odorants in hog waste can cause psychological stress and irritate nasal passages.
1988), illustrated that rats in one motivational state experience deficits in discrimination learning when the relevant cues are odorants from other rats exposed to different conditions of deprivation and reward.
These odorants can be used to differentiate the various nut aromas.
Odorant receptors and the organization of the olfactory system also were the topic of the 2004 Nobel Prize in Medicine.
Until such time as all active sites are passivated, oxidation of mercaptan odorants will continue with a resultant reduction of the vapor phase concentration of the odorant.
In addition, 4 bio-functional odorants were selected, namely, benzyl alcohol (odorant 7) (Hibbard et al.
However, there is at present no research that characterizes the entire range of odorants and their correlation to microclimate variables in these systems.
m) the availability of vehicles authorized to transport adr products odorants and adapted to the various types of packaging used;
Odorants, flavor compounds, and pigments begin to close the book, with the final few chapters addressing antinutritional or toxic organics naturally occurring in some foods, food additives, and potential contaminants of concern.
The spatially distributed arrangement of aesthetasc sensilla in these animals provides an unusual opportunity to determine the extent to which fractional regions of the receptor array contribute to the central representation of odorants.