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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 ?
To see if airflow affects perception of either odorant class, Sobel and his colleagues asked Stanford undergraduates to sniff a mix of two compounds and estimate their ratio.
Researchers found that the aroma of an aqueous pineapple juice model solution based on these natural odorant concentrations perfectly resembled the aroma of the original juice, which indicated that the key aroma compounds were included in the solution.
The mapping of odor codes opens up new possibilities for biotechnology applications and it will also lay the scientific groundwork for the next generation of aroma products, which use the potential of optimized biosynthetic pathways in plants for industrial-scale production of high-quality food odorants.
Odorant blend suitability: numerous types of odorants exist for different climates and stream specifications: there is no "one size fits all" solution.
Heats of Adsorption and Interaction Determinations of Natural Gas Odorants on Surrogate Soil Surfaces, Keith E.
It said the researchers had wanted to investigate anecdotal wisdom that such scents really did cause positive psychological effects: "It has been empirically known from ancient times that some odorants bring about psychophysiological effects, such as sedative, stimulative, antistress, anti-inflammatory, and anticonvulsant effects; for example, an antidepressant effect is provided by lemon odour and a sleep-enhancing effect by valerian.
Prolonged retronasal aroma perception, as it is perceived after complete swallowing of a food, must be induced by persistent odorants which are present in the oral cavity for a certain period of time.
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.
San Diego, CA) has patented a method for using sensory G protein-coupled receptors that recognize chemical sensants, particularly those involving olfactory and taste receptors; polypeptide fragments and mutants thereof; classes of such receptors; polynucleotides encoding such receptors, fragments and mutants thereof, and representatives of receptor classes; genetic vectors including such polynucleotides; and cells and non-human organisms engineered to express such receptor complexes, fragments and mutants of an olfactory or taste receptor, and representatives of receptor classes to simulate sensory perception of odorants and tastants is described.
Whelks appear to have broadly tuned chemoreceptors and manufactured baits may need to mimic the complex mixture of odorants derived from natural sources.
Sleep was induced in rats with pentobartial and the effects of the 10 odorants were assessed via ECG, sleep latency and length.
In a study of 10 patients with Parkinson's disease (PD) compared with 10 healthy controls, the researchers found significant brain activation in the cerebral cortex in control patients exposed to strong odorants, while PD patients showed little brain activation.