mercaptan


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Related to mercaptan: ethyl mercaptan

mercaptan

(mərkăp`tăn) or

thiol

(thī`ōl), any of a class of organic compounds containing the group -SH bonded to a carbon atom. The volatile low-molecular-weight mercaptans have disagreeable odors. Mercaptans are found in crude petroleum, and methyl mercaptan is produced as a decay product of animal and vegetable matter. They also are produced by certain plants and animals; e.g., allyl mercaptan is released when onions are cut, butanethiol (butyl mercaptan) derivatives are present in skunk secretion, and mercaptans are among the sulfur compounds causing the disagreeable odor of flatus. T-butyl mercaptan blends are often added to the odorless natural gas used for cooking and serve to warn of gas leaks. Mercaptans take part in a wide variety of chemical reactions. Their principal uses are in jet fuels, pharmaceuticals, and livestock-feed additives.

mercaptan

[mər′kap‚tan]
(organic chemistry)
A group of organosulfur compounds that are derivatives of hydrogen sulfide in the same way that alcohols are derivatives of water; have a characteristically disagreeable odor, and are found with other sulfur compounds in crude petroleum; an example is methyl mercaptan. Also known as thiol.
References in periodicals archive ?
The contest challenges elementary school students in BGE's service area to submit a three-panel comic strip illustrating a natural gas safety message featuring Captain Mercaptan, BGE's fictional natural gas safety superhero.
Mercaptan is a harmless, organic substance made of carbon, hydrogen, and sulphur that is detectable to the human nose at levels of less than one part per million.
The same holds true for the plant's detector system for methyl mercaptan, the deadly chemical that leaked and caused the deaths.
However, the details of the mechanism of the formation of mercaptans are currently unknown.
It's invisible and odorless without the mercaptan that gas companies add to give it a rotten-egg smell.
The compatibilizing groups include amine, mercaptan, epoxy, isocyanate, anhydride, alcohol, or acid groups.
The first documented instance of gas odorization brings us back to Germany in 1880, when a scientist named Von Quaglio added ethyl mercaptan to give water gas a distinguishable smell.
The odor added to LP is normally ethyl mercaptan, which smells like rotten eggs in order to detect the gas.
Roxas said Angelito San Juan, the renter of the ill-fated Unit 501-B of Two Serendra, did not smell the accumulated LPG fumes inside the room as ethyl mercaptan - the chemical used as odorant of LPG - had vaporized beyond its recognizable level.
The most common analyses are covered; TAN according to ASTM D664, TBN according to ASTM D4739 and D2896 and mercaptan analysis according to UOP 167 and ASTM D3227.
Key statement: A method is presented for making an amino alkoxy-modified silsesquioxane (amino AMS) comprising one or more compounds selected from the group consisting of an amino-AMS, an amino/mercaptan co-AMS, an amino/ blocked mercaptan co-AMS, and mixtures of these.