Thermal Decomposition of Organic Sulfur Compounds<sup>1</sup>

Faragher, W. F.; Morrell, J. C.; Comay, S.

doi:10.1021/ie50221a030

Cited by 29 publications

(18 citation statements)

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“…[8I The more nlarkecl catalyses by the complete reaction mixture could be attributed to reaction [7]. The autoacceleratio~l and approximate coincidence of the induction periods of the ~nercaptan and hydrogen sulphide reaction could also be dependent on the production of s~ilphur atoms.…”

Section: Conzparison With the Decomposition Of Diefhyl Disz~lpl~idementioning

confidence: 99%

The Thermal Decomposition of Dimethyl Disulphide

Coope¹,

Bryce²

1954

Can. J. Chem.

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The thermal decomposition of dimethyl disulphide has been stitdied in the gaseous state by a static method. The primary reaction, which follows a reproducible induction period, produces one mole of methyl rnercaptan per mole of disulphide, together with a product of low volatility believed to be a thioformaldehyde polymer:There is also a competing reaction producing a large quantity of hydrogen sulphide. 'The remaining volatile products, hydrocarbons of two or more carbon atoms (believed to be chiefly ethylene), free sulphur, polysulphides, and carbon disulphide are formed either by the latter reaction or by the extensive decomposition of products. The decomposition is catalyzed by hydrogen sulphide, and more strongly by the complete reaction mixture. A mechanism is proposed for the main reaction.The present investigation was undertaken as a contribution to our fragmentary understanding of the mechanisms of reactions i~lvolvi~lg the carbonsulphur bond system in organic sulphur compounds. The C-S-S-C bond system of dimethyl disulphide was of special interest. Little is known about the thermal deconlposition of the alkyl disulphides, although the thermal decompositio~l of aryl disulphides has received some study. The work of Schonberg, Mustafa, and Askar (10) suggests that diphenyl disulphide dissociates a t the S-S bond into two free aryl thial radicals. In an early investigation Otto and Rossing (8) found that on distillation a t atmospheric pressure diamyl disulphide (b.p. 248" C.) gradually decomposes into sulphur or sulphur-rich substances and a tarry residue. Bezzi (3) reported that dioctyl disulphide decomposes a t its boiling point of 190" C. a t 15 mm. Faragher, Morrell, and Comay (7) found that decomposition of vaporized naphtha solutio~ls of various alkyl disulphides a t 496" C. produces the corresponding alkyl mercaptan, hydrogen sulphide, free sulphur, alkyl sulphides, thiophenes, and saturated and unsaturated hydrocarbons.In some preliminary experiments in this laboratory it was found by Patrick (9) that dimethyl and diethyl disulphides decompose above 300" C. yielding co~nplex pressure-time curves. The homogeneous decomposition of dimethyl disulphide was found to produce large amounts of mercaptan and hydrogen sulphide. E X P E R I M E N T A L ReagentsT h e dimethyl disulphide, obtained from Eastman I

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Section: Conzparison With the Decomposition Of Diefhyl Disz~lpl~idementioning

confidence: 99%

The Thermal Decomposition of Dimethyl Disulphide

Coope¹,

Bryce²

1954

Can. J. Chem.

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“…The formation of this hydrogen sulfide may be attributable to the decomposition of some of the high boiling sulfur fractions or to the combination of elemental sulfur with certain hydrocarbons. The thermal degradation of the sulfur compounds is well known (41,118) and can be illustrated with information recently presented in the literature (2,88), which shows that distribution of sulfur compounds is affected by the distillation conditions. In a study by the API Project 48, it was shown that the distillation of the higher boiling petroleum fractions under atmospheric conditions yielded a considerably greater breakdown of the sulfur compounds than a corresponding vacuum distillation carried out at low temperatures (21,174).…”

mentioning

confidence: 60%

“…As previously pointed out, only a comparatively small portion of the total sulfur present in crude oil is in the fractions distilling below 500° to 600° F., but thermal effects causing the decomposition of sulfur compounds are the reason why there are more sulfur compounds below the boiling range than would be expected if heat were not applied. Several investigators (116,118) have reported that mercaptans and thiophenes are the most stable of the organic sulfur compounds. Sulfides and disulfides under thermal cracking conditions form hydrogen sulfide, thiophenes, and mercaptans.…”

Section: Effect Of Various Refining Processes On Sulfur Compoundsmentioning

confidence: 99%

Sulfur Compounds from Petroleum Fractions

Karchmer¹

1954

Advances in Chemistry

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In considering the sulfur-containing compounds obtain able from petroleum and its fractions five principal topics are discussed-sulfur compound types that occur in pe troleum and its fractions; methods of identifying, deter mining, and naming sulfur compounds; the chemical and physical properties of the sulfur compounds likely to be found in petroleum fractions; the effect of the various refinery processes upon the constituent sulfur compounds; and processes for segregating and manufacturing sulfur compounds from petroleum fractions. Included in this discussion are a number of key literature references which provide additional information and leads for continuing the search. In addition to specific references, general ref erence sources are given, such as the U. S. Patent Class and Subclasses, the work of the Bureau of Mines and API Project 48, a list of periodicals that generally publish articles on sulfur petroleum chemistry, and the names of those organizations that are actively engaged in the field. I η searching for information on the sulfur compounds obtainable from petroleum, the most inclusive single guide is the Chemical Abstracts. Very few fields of human endeavor can boast such a comprehensive, well-organized source of knowledge. However, it is this completeness that presents an obstacle to the searcher who has but a limited amount of time to spend on a subject that may embrace several different categories of the Abstracts. The chemistry of the sulfur compounds derivable from petroleum is such a case, since the sheer number of all the published reports on sulfur make the task of the literature searcher who is selecting the pertinent references monumental. Almost limitless amounts of time are required to locate each promising lead in the index, ferret it out in the Abstracts, and follow through, if necessary, to the original article. The examination of the abstracts alone requires large amounts of time. Of necessity the wording in the indexes must be brief, and many false leads are obtained from those clipped and sometimes cryptic phrases. Promising references which appear to contain the desired information in many cases turn out to be valueless.While there is no short cut method of examining all of the published information on sulfur, any systematic division of the subject into smaller topics should aid in reducing the time spent to obtain fruitful results. It is, therefore, the object of this paper to subdivide the problem into its component parts and to acquaint the searcher with the key points of each subdivision by summarizing some of the most important work published in the field and presenting a bibliography with the appropriate subject category. Typical and significant references are included. The intent has been to include many references which contain large bibliographies and which give leads to other information in that subject. It is hoped that with these summaries and lists of references as a background, the searcher will be aided in making his own study of his particular problem. 398Downlo...

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“…Under these operating conditions, other unidentified reaction products were also observed in addition to mentioned light organic products. The available tests show that other decomposition products may also be obtained during the pyrolysis of sulfur mustard, which may include carbon disulfide, 1,2-dichloroethane, thiophene and methylthiophene (Faragher et al 1928;Wagner et al 1999;Battin-Leclerc et al 2000).…”

Section: Pyrolysismentioning

confidence: 99%

Thermal and catalytic methods used for destruction of chemical warfare agents

Nawała

Jóźwik

Popiel

2019

Int. J. Environ. Sci. Technol.

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The decontamination of chemical warfare agents (CWAs) from structures, environmental media and even personnel has become an area of particular interest in recent years due to increased homeland security concerns. This article reviews applications of catalytic methods used for decontamination of CWAs. Most attention was given to the following methods: thermocatalysis, photocatalysis and enzyme catalysis among the many methods of catalytic CWA decomposition. Unfortunately, there are not enough data obtained with real CWAs due to the difficulty in handling, so we have described also data available for CWAs simulants. These methods can be useful for decontamination systems that can reduce the damage caused by possible terrorism.

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Thermal Decomposition of Organic Sulfur Compounds¹

Cited by 29 publications

References 0 publications

The Thermal Decomposition of Dimethyl Disulphide

The Thermal Decomposition of Dimethyl Disulphide

Sulfur Compounds from Petroleum Fractions

Thermal and catalytic methods used for destruction of chemical warfare agents

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Thermal Decomposition of Organic Sulfur Compounds1

Cited by 29 publications

References 0 publications

The Thermal Decomposition of Dimethyl Disulphide

The Thermal Decomposition of Dimethyl Disulphide

Sulfur Compounds from Petroleum Fractions

Thermal and catalytic methods used for destruction of chemical warfare agents

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Product

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Thermal Decomposition of Organic Sulfur Compounds¹