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Topic: Methyl mercaptan

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	ATSDR - ToxFAQs™: Methyl Mercaptan
		Methyl mercaptan is released from decaying organic matter in marshes and is present in the natural gas of certain regions in the United States, in coal tar, and in some crude oils.
		Methyl mercaptan is released to the air from both natural and industrial sources.
		Methyl mercaptan may be formed in water from chemical reactions.
	www.atsdr.cdc.gov /tfacts139.html (863 words)

	ATSDR - MMG: Methyl Mercaptan
		Methyl mercaptan is a colorless flammable gas with unpleasant odor described as rotten cabbage.
		Methyl mercaptan is incompatible with strong oxidizers, bleaches, copper, aluminum, and nickel-copper alloys.
		Methyl mercaptan inhibits mitochondrial respiration by interfering with cytochrome c oxidase.
	www.atsdr.cdc.gov /mhmi/mmg139.html (3699 words)

	METHYL MERCAPTAN - (Organic Method #26) (Site not responding. Last check: 2007-10-03)
		Methyl mercaptan is regenerated from the mercuric mercaptide, formed during sampling, by treatment with hydrochloric acid.
		Methyl mercaptan is extensively used in the synthesis of the amino acid methionine.
		The methyl mercaptan concentration (µg/sample) is obtained from the calibration curve from Section 3.5.3.
	www.osha.gov /dts/sltc/methods/organic/org026/org026.html (2717 words)

	Methyl Mercaptan, CH3SH, is has been used in organic synthesis and is an intermediate for jet fuel additives, ...
		Methyl Mercaptan, CH3SH, is has been used in organic synthesis and is an intermediate for jet fuel additives, fungicides, and methionine.
		: Methyl Mercaptan, CH3SH, is has been used in organic synthesis and is an intermediate for jet fuel additives, fungicides, and methionine.
		Description: At room temperature and atmospheric pressure methyl mercaptan is a colorless, flammable, toxic gas with an extremely disagreeable odor.
	www.c-f-c.com /gaslink/pure/methyl-mercaptan.htm (111 words)

	Champex Website (Site not responding. Last check: 2007-10-03)
		Methyl mercaptan is widely recognized as a common component of mouth odours.
		The purpose of the test was to determine the deodorizing effects of various concentrations of Champex on methyl mercaptan, at a level of 0.5 ppm, which is 250 times the minimum detectable level by the human nose (0.002 ppm).
		Concentrations of chemical gases in the excreta (ammonia, methyl mercaptan, hydrogen sulfide, and amine) were measured using a Kitagawa gas detector, while further ammonia concentrations in the blood were measured using the Fuji-Okuda modified method prior to the initial administration of Champex.
	www.directfood.net /champex/tech1.asp (1217 words)

	FAQ Regarding Gas Odor
		Methyl mercaptan is a powerful odorant as is its cousin, ethyl mercaptan, which is found in the chemical substances found in a skunk's repellent.
		Methyl mercaptan is also generated in the decaying roots of Raphanus sativus.
		Mercaptans generated in the environment can be carried by rain or irrigation water through the soil.
	www.co.el-dorado.ca.us /emd/solidwaste/faq_gas.html (372 words)

	Toxicologic Review of Selected Chemicals (Site not responding. Last check: 2007-10-03)
		Methyl mercaptan is a flammable, water-soluble gas with a disagreeable odor like that of rotten cabbage.
		Festa reported that the odor of methyl mercaptan is relatively faint at 0.05 ppm, although the substance may be mildly irritating over long periods of exposure to concentrations of 4 to 5 ppm.
		OSHA is revising its limit for methyl mercaptan to 0.5 ppm as an 8-hour TWA, and this limit is promulgated in today's rule.
	www.bu.edu /ehs/ih/tox/74-93.htm (647 words)

	Process for continuous production of methyl mercaptan - Patent 5886230
		Methyl mercaptan is an important industrial intermediate for synthesis of methionine and for production of dimethyl sulfoxide and dimethyl sulfone.
		Methyl mercaptan is usually synthesized in the gas phase at temperatures between 300.degree.
		An object of this invention is to improve the process for producing methyl mercaptan and an enhancement of the economics of the overall process, with respect to both the capital cost and the operating power costs, through improved pretreatment of the feed gas mixture and better utilization of the reaction heat.
	freepatentsonline.com /5886230.html (4127 words)

	Performance of compost and hog-fuel biofilters: Impact of periods of now-use and varying methyl mercaptan loading (Site not responding. Last check: 2007-10-03)
		Abstract: The work reported here describes the aerobic biodegradation in biofilters of methyl mercaptan, which is a foul smelling compound found in the air emissions from Kraft pulp mills.
		These biofilters were exposed to variations in methyl mercaptan concentration, fluctuating waste airflow rate, and periods of non-use to evaluate the effects of changes in contaminant mass loading and starvation on biofilter dynamics and performance.
		During that time the outlet methyl mercaptan concentration declined from 2 to 1 ppmv and the elimination capacities remained constant at around 6 g m(-3) h(-1).
	www-rcf.usc.edu /~bfilter/f425.html (400 words)

	Process for the manufacture of methyl mercaptan - United States Patent 3,935,276
		It is, therefore, a primary object of the instant invention to provide a process for the synthesis of methyl mercaptan from hydrogen sulfide and methanol, wherein the problems and disadvantages associated with prior art methods are obviated.
		A further object of the invention is to provide a process for the preparation of methyl mercaptan wherein a high degree of conversion of the methanol reactant is achieved resulting in enhanced yield of the product while at the same time avoiding the formation of undesired by-products.
		In accordance with the process of the instant invention, essential temperature control in the synthesis of methyl mercaptan is achieved entirely within the reaction system by modifying certain process parameters without the necessity of utilizing any form of external cooling means such as water jackets or heat exchangers.
	xrint.com /patents/us/3935276 (2477 words)

	Catalyst, process for its preparation, and use for synthesis of methyl mercaptan - Patent 5977011
		The present invention relates to a catalyst for the synthesis of methyl mercaptan from methanol and hydrogen sulfide, and a process for preparing this catalyst.
		Methyl mercaptan is usually synthesized in the gas phase at temperatures from 300.degree.
		An object of this invention is to improve the methyl mercaptan synthesis in terms of improved activity and selectivity at low molar ratios of hydrogen sulfide to methanol, in comparison with the known methods using known catalysts, and which therefore gives a more economical process.
	www.freepatentsonline.com /5977011.html (3983 words)

	EPA/OPPT/High Production Volume (HPV) Challenge Program: Robust Summaries & Test Plans: Methyl Mercaptan and Methyl ... (Site not responding. Last check: 2007-10-03)
		The submitter provided an adequate justification that methyl mercaptan and methyl mercaptide are interchangeable with regard to their toxicity because methyl mercaptide is expected to be rapidly converted to methyl mercaptan in biological and environmental systems.
		The submitter proposed methyl mercaptan and methyl mercaptide as a category based on a common functional group and a “family approach” for justifying the grouping of acids and their corresponding salts under a category.
		Given the data presented by the submitter, although conversion of methyl mercaptan to hydrogen sulfide via demethylation appears quantitatively possible, the majority of administered methyl mercaptan in rats is metabolized to a sulfate that is conjugated and eliminated via the urine.
	www.epa.gov /chemrtk/methmran/c13333ct.htm (1304 words)

	EPA/OPPT/High Production Volume Challenge Program (HPV): Robust Summaries & Test Plans: Methyl Mercaptan and Methyl ... (Site not responding. Last check: 2007-10-03)
		Methyl mercaptide is the salt of methyl mercaptan.
		Methyl mercap- tan is used as a gas odorant, catalyst, intermediate in manufacturing jet fuels, and in the production of certain chemicals, including pesticides and fungicides.
		Methyl mercaptan is acutely toxic and can produce muscular weakness, tremors, unconsciousness, and death by respiratory paralysis.
	www.epa.gov /chemrtk/methmran/c13333pm.htm (1186 words)

	mercaptan on Encyclopedia.com
		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.
	www.encyclopedia.com /html/m1/mercapta.asp (347 words)

	Topas 1 (Site not responding. Last check: 2007-10-03)
		VSC, and in particular methyl mercaptan, are therefore capable of inducing deleterious changes in both the extracellular matrix and the local immune response of periodontal tissues to plaque antigens." Ratcliff PA, Johnson PW.
		Since free L-methionine, rather than protein, is the main source for methyl mercaptan, we estimated the methionine supply from the gingival fluid into the oral cavity of patients with periodontal involvement.
		The highest concentration of hydrogen sulfide in gingival fluid was 1.9 mmol/liter, and of methyl mercaptan 0.16 mmol/liter.
	www.altcorp.com /AffinityLaboratory/topas.htm (2218 words)

	[No title] (Site not responding. Last check: 2007-10-03)
		Regulated Substances Handled Methyl Mercaptan is the only toxic substance, regulated by EPAs RMP rule, that is stored and used at the Omnium facility.
		Methyl Mercaptan is highly flammable, having a flash point <-2F (-17C).
		Methyl Mercaptan reacts with carbon steel or iron in the absence of oxygen to form ferrous sulfide.
	www.rtk.net /rmp/sum7/MO/fac100000183543 (1405 words)

	Process for the manufacture of methyl mercaptan from carbon oxides - Patent 4410731
		Methyl mercaptan is a well known article of commerce used as an intermediate for the manufacture of a variety of agricultural chemicals, including methionine, a widely used feed supplement for poultry.
		The single-pass conversions and yields of carbon monoxide to methyl mercaptan (MM) are calculated from the gas chromatographic analyses.
		The process of this invention is a continuous reaction wherein a mixture of carbon oxide, hydrogen sulfide or elemental sulfur, and hydrogen is subjected to elevated temperature and pressure in the presence of a specified sulfided or sulfide catalyst system to provide methyl mercaptan in improved conversions and yields.
	www.freepatentsonline.com /4410731.html (4430 words)

	The First Responder: Let's Take a PEEK at the PEAC Software (Site not responding. Last check: 2007-10-03)
		Methyl Mercaptan is highly irritating when it contacts moist tissues such as the eyes, skin, and upper respiratory tract.
		Uses: Methyl Mercaptan is produced by the reaction of hydrogen sulfide with methanol.
		Incompatibilities: Methyl mercaptan is incompatible with strong oxidizers, bleaches, copper, aluminum, and nickel-copper alloys.
	www.imakenews.com /aristatek/e_article000259942.cfm (1871 words)

	Thiochemicals Online Ordering (Site not responding. Last check: 2007-10-03)
		Which mercaptan is typically used for chain transfer in polystyrene?
		Which mercaptan is used as a chain transfer agent for acrylates?
		Methyl mercaptan forms a solid hydrate with water.
	www.atofinachemicals.com /thio/Mercaptans/index.cfm?act=faq (270 words)

	Vitamins and Mineral Supplements and Herbal Supplements for your Health
		In raw garlic, allyl mercaptan was detected immediately, indicating a rapid conversion from allicin.
		In heat-treated garlic, concentrations of methyl mercaptan and allyl mercaptan increased somewhat over time to an extent not seen in raw garlic.
		Methyl mercaptan, allyl mercaptan and allyl methyl sulfide were common to both, though methyl mercaptan and allyl mercaptan levels were much higher in raw garlic than heated.
	www.herbalgram.org /naturemade/herbclip/review.asp?i=42700 (625 words)

	Odor Control Advances At Cocomposting Facility
		Hydrogen sulfide and methyl mercaptan were selected primarily because removal of these compounds has commonly been used as an indicator of odor control performance in wastewater treatment applications.
		The hydrogen sulfide and methyl mercaptan levels were increasing at times, even though overall removal rate for total reduced sulfur compounds was high.
		Methyl mercaptan (MM) and hydrogen sulfide (H2S) are intermediates in the oxidative pathways for dimethyl disulfide (DMDS) and dimethyl sulfide (DMS), as shown in Figure 3 (Smith and Kelly, 1988a; Smith and Kelly, 1988b; Kanagawa and Kelly, 1986; De Bont et al., 1981; Suylen et al., 1986).
	www.jgpress.com /BCArticles/2000/01005.html (3013 words)

	Documentation for Immediately Dangerous to Life or Health Concentrations (IDLHs) - 74931
		ACGIH [1971] reported that some investigators show toxicities of the same magnitude for hydrogen sulfide and methyl mercaptan [Ljunggren and Norberg 1943]; others indicate that the toxicity of methyl mercaptan is somewhat less than that of hydrogen sulfide [DeRekowski 1893; Frankel 1921].
		Some investigators have reported that the toxicity of methyl mercaptan is similar to hydrogen sulfide while others report the toxicity to be somewhat less than hydrogen sulfide [DeRekowski 1893; Frankel 1921].
		Experimental data for substantiation of the threshold of methyl mercaptan, dimethyl sulfide, and dimethyldisulfide in the air of the working zone of paper industries.
	www.cdc.gov /niosh/idlh/74931.html (389 words)

	DIG-L: Biogas (odour) (Site not responding. Last check: 2007-10-03)
		Methyl Mercaptan, the only other significant odour component in the biogas was not oxidised but diluted only.
		However the initial levels of Methyl Mercaptan were very low compared to H2S.
		The odour threshold of hydrogen sulphide is given by various authors to range from 0.0007 to 0.0140 mg/m3 and for Methyl Mercaptan 0.000040 to 0.0820 mg / m3.
	solstice.crest.org /pipermail/digestion/1997-June/000679.html (475 words)

	Formation of Methyl Mercaptan from L-Methionine by Porphyromonas gingivalis -- Yoshimura et al. 68 (12): 6912 -- ...
		of methyl mercaptan in the pathogenesis of this organism.
		Methyl mercaptan was formed by using a modification of the method of Persson et al.
		Effect of hydrogen sulfide and methyl mercaptan on the permeability of oral mucosa.
	iai.asm.org /cgi/content/full/68/12/6912 (3281 words)

	Methyl mercaptan
		Methyl mercaptan is released from decaying organic matter in marshes and is present in the natural gas of certain regions in the United States, in coal tar[?], and in some crude oils.
		It is manufactured for use in the plastics industry, in pesticides, and as a jet fuel[?] additive.
		The text of this article is licensed under the GFDL.
	www.ebroadcast.com.au /lookup/encyclopedia/me/Methyl_mercaptan.html (123 words)

	United States Patent Application: 0040219126
		With this odor eliminating material, an odor of ammonia, hydrogen sulfide, methyl mercaptan, acetic acid, acetaldehyde or the like can be eliminated fully because of the synergistic effects of the carried hydrazine derivative and metal phthalocyanine complex.
		In this case, the performance for eliminating an odor of methyl mercaptan and acetic acid can be further improved.
		According to this odor eliminating material, an odor of ammonia, hydrogen sulfide, methyl mercaptan, acetic acid, acetaldehyde or the like can be eliminated fully because of the synergistic effects of the carried hydrazine derivative and metal phthalocyanine complex.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040219126".PGNR.&OS=DN/20040219126&RS=DN/20040219126 (9459 words)

	Pesticide residues in food:2002 - METHAMIDOPHOS
		The degradation of methyl mercaptan was also studied in vitro in fresh whole blood taken by venipuncture and collected in 15-ml glass vials closed by a septum and containing heparin.
		S]Methyl mercaptan was added to 2 ml of blood as a gas at room temperature at a concentration of 4–40 nmol/ml of blood and incubated for 30 min at 37 °C. After incubation, the headspace of the vial was analysed, and the amount of radioactivity extracted was estimated in plasma.
		Methamidophos, desamino-methamidophos and/or S-methyl hydrogen phosphoramidothioate were transformed to methyl mercaptan, which was converted in a final step to CO Methamidophos was also administered to rats immediately after delivery, and groups of suckling pups were killed at intervals of 1, 3, 6, 12, 24, 36 and 48 h after administration to the dams.
	www.inchem.org /documents/jmpr/jmpmono/2002pr10.htm (13484 words)

	wcbstv.com - What is Methyl Mercaptan?
		It occurs naturally in certain foods, such as some nuts and cheese.Methyl mercaptan is released from decaying organic matter in marshes and is present in the natural gas of certain regions in the United States, in coal tar, and in some crude oils.
		According to the ATSDR, Methyl mercaptan is always present in your body.
		According to the ATSDR, the EPA requires that discharges, spills, or accidental releases of 100 pounds or more of methyl mercaptan must be reported to the EPA.
	wcbstv.com /topstories/local_story_008150157.html (1016 words)

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