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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 ?
The plant can process 800,000 tons of gas odorant annually.
At least 3 individuals were tested (1 antenna preparation from each beetle) for each replicate, and each odorant was tested 3 times for each concentration (0.
Correlations between microclimate variables and airborne particles and odorants
The linear distribution of sensilla, representing a spatial gradation in age, requires examination of possible age-related variations in odorant sensitivities of aesthetascs in different regions along the flagellar shaft.
Thus, the odorant must enable a person with a normal sense of smell to detect the presence of natural gas at a level of 1 %.
There are issues and questions regarding odorant, and it is not proper for us to speculate on that with the ongoing investigation and pending litigation, but there has been no official determination as to what role odorant or lack thereof played in the explosion.
In preceding weekly training sessions, the panelists were trained in recognizing orthonasally and retronasally 150 selected odorants at different odorant concentrations according to their odor qualities.
The method is comprised of calculating values of odor detection threshold, odor detection threshold in air, acceleration ([GAMMA]) flash water release ([OMEGA]) values for a group of odorants; selecting at least three different odorants, each odorant having an acceleration (F) value of about 1000 or greater, a flash release ([OMEGA]) value selected from the group consisting of approximately 10 or greater, from approximately 0.
These address the key regulators of the cell cycle, genetic regulation of organ development and programmed cell death, magnetic resonance imaging, odorant receptors and the olfactory system, and bacteria related to gastritis and peptic ulcer disease.
The invention has application, for example, in the design and formulation of odorant and tastant compositions.
To identify other baits, the activity in the pallial nerve of whelks was determined during exposure of the osphradium to odorant solutions prepared from horseshoe crab eggs, horseshoe crab hemolymph, and hard clam (Mercenaria mercenaria) tissue.