Hydrogen sulphide treatment

Barton and his group have prepared the interesting new di-t-butyl thio-ketone (7) in high yield by reaction of carbon disulphide with the lithium salt of the corresponding ketone imine. Independently, Ohno and his co-workers have published an analogous synthesis of this non-enethiolizable thioketone (7). Aliphatic thiones and, possibly, enethiols have been obtained by reaction of arylimines with benzoic anhydride and a stream of hydrogen sulphide. Treatment of a vinyl chloride with sodium monosulphide led to the isolation of thio-dimedone (8 R = H), which has an enethiol ketone structure. Basic hydrolysis... 

CfiHsNjOs. Red needles m.p. 168-169°C. Soluble in dilute acids and alkalis. Prepared by reduction of picric acid with sodium hydrogen sulphide, ft is used for the preparation of azodyes, which can be after-chromed by treatment with metallic salts owing to the presence of a hydroxyl group ortho to the amino-group. 

Here again, electrolysis, or treatment with hydrogen sulphide, shows that silver... 

Solutions containing compounds of copper, tin, arsenic, antimony, and other reducible metals must never be used. These must be removed before the reduction by treatment with hydrogen sulphide. 

Antimony pyrogallate, Sb(C6H503). Antimony(III) salts in the presence of tartrate ions may be quantitatively predpitated with a large excess of aqueous pyrogallol as the dense antimony pyrogallate. The method fadlitates a simple separation from arsenic the latter element may be determined in the filtrate from the predpitation of antimony by direct treatment with hydrogen sulphide. 

Hydrogen sulphide Various chemical processes Oil wells, refineries Sewage treatment Odours, toxic Crop damage/reduced yields... 

Diarsenic trisulphide produces particularly toxic sulphur dioxide, hydrogen sulphide and arsenic by thermal decomposition or acid treatment. 

YantWP. 1930. Hydrogen sulphide in industry Occurrence effects and treatment. Am J Public Health 20 598-608. 

Einarsen, A.M., A. Aesoey, A.-I. Rasmussen, S. Bungum, and M. Sveberg (2000), Biological prevention and removal of hydrogen sulphide in sludge at Lillehammer Wastewater Treatment Plant, Water Sci. Tech., 41(6), 175-182. 

Hvitved-Jacobsen, T., B. Jiitte, P. Halkjaer Nielsen, and N.Aa. Jensen (1988), Hydrogen sulphide control in municipal sewers. In H. H. Hahn and R. Klute (eds.), Pretreatment in Chemical Water and Wastewater Treatment, proceedings of the 3rd International Gothenburg Symposium, Gothenburg, Sweden, June 1—3, 1988, Springer-Verlag, New York/Berlin, pp. 239—247. 

Stripping (hydrogen sulphides) followed by treatment of the stripping gas... 

In the aerobic treatment step, which in general follows the anaerobic treatment step and the specific treatment processes for removal of ammonia and hydrogen sulphide, residual amounts of organic pollutants are removed. A proper sequence of process steps and proper process conditions in the aerobic treatment step can also lead to the removal of nitrogen and phosphorus containing pollutants... 

The sulphides of the alkali metals and of the alkaline earth metals are readily decomposed by weak acids, even by carbonic acid.3 Ily the use of these sulphides and dilute sulphuric acid it is possible to obtain hydrogen sulphide in a high degree of purity. The hydrosulphides of the alkaline earth metals arc convenient sources of hydrogen sulphide, yielding the gas on treatment with carbon dioxide or even by merely heating.4 The carbon dioxide method is applied on a technical scale in the extraction of sulphur from alkali waste (see p. 50). 

The solutions of these polysulphides are yellowish-brown, and on treatment with acid in the usual manner they yield hydrogen sulphide and a precipitate of sulphur. In many eases polysulphides of the alkali and alkaline earth metals have been isolated in the solid state the types M2S4 and M2S5 appear to be the most stable as a general rule.7... 

Tests for mordants. The principal mordants may be detected by the method indicated on p. 473 for their detection in dyed woollen goods. As mordants for cotton goods use is made also of antimony salts and sometimes of nickel salts. If the method referred to is followed, antimony will be identified as sulphide when the hydrochloric acid solution of the disaggregated mass is treated with hydrogen sulphide nickel will be identified as sulphide, separated by the action of ammonium sulphide on the filtrate obtained after the treatment with ammonium chloride and ammonia. 

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