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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 ?
Results indicated that losses in major odorants, as well as the formation of methional from its precursor methionine during juice processing, accounted for the development of a cooked-like off-flavor in the industrially manufactured pineapple juice.
law requires validation procedures performed by human sniffers; due to the discrete and subjective nature of this method, sniffer data is increasingly being supplemented with continuous odorant measurement technology.
Key words: cross-adaptation; odorant conjugation; odorant masking; Zwaardemaker pair.
They knew or should have known that 200 gallons sitting in a new tank for three months would have had odorant fade.
Environment Agency representative Barry Berlin told the court that on August 5 2008, while clearing out an empty tanker, technical problems occurred which caused gas odorant to escape.
An odorant is added to propane to help alert customers to a propane gas leak, but this propane might not have the recommended level of odorant.
The aims of the present investigation were first to identify and quantify odorants exhaled during palm wine consumption and secondly, to determine the influence of odorant adsorption or desorption on aroma persistence.
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.