High Purity Hydrogen Sulfide (H2S) Specialty Gases
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Contact usSpecifications
| Purity , % | 99.9 |
| Carbon Dioxide | ≤100 ppmv |
| Carbon Disulfide | ≤200 ppmv |
| Carbonyl Sulfide | ≤600 ppmv |
| Nitrogen | ≤100 ppmv |
| Hydrocarbons | ≤100 ppmv |
Technical Information
| Cylinder State @ 21.1°C | Liquid |
| Flammable Limits In Air | 4-44% |
| Auto Ignition Temperature (°C ) | 260 |
| Molecular Weight (g/mol) | 34.076 |
| Specific gravity (air =1) | 1.192 |
| Critical Temperature ( °C ) | 100.38 |
| Critical Pressure ( psig ) | 1291.77 |
Description
Hydrogen selenide is an inorganic compound with the formula H2Se. This hydrogen chalcogenide is the simplest and most commonly encountered hydride of selenium. H2Se is a colorless, flammable gas under standard conditions. It is the most toxic selenium compound with an exposure limit of 0.05 ppm over an 8-hour period.Even at extremely low concentrations, this compound has a very irritating smell resembling that of decayed horseradish or "leaking gas", but smells of rotten eggs at higher concentrations.Hydrogen Selenide is a colorless , flammable , extremely toxic gas with a very unpleasent odor . It begins to dissociate at approximately 160°C. It decomposes in air to form a red selenium precipitate. It is shipped as a liquefied gas under its own vapor pressure.
Hydrogen sulfide is mainly consumed as a precursor to elemental sulfur. This conversion, called the Claus process, involves partial oxidation to sulfur dioxide. The latter reacts with hydrogen sulfide to give elemental sulfur. The conversion is catalyzed by alumina.Many fundamental organosulfur compounds are produced using hydrogen sulfide. These include methanethiol, ethanethiol, and thioglycolic acid.Hydrosulfides can be used in the production of thiophenol.Sodium sulfides are used in the paper making industry. Specifically, salts of SH− break bonds between lignin and cellulose components of pulp in the Kraft process.Many metal ions react with hydrogen sulfide to give the corresponding metal sulfides. Oxidic ores are sometimes treated with hydrogen sulfide to give the corresponding metal sulfides which are more readily purified byy flotation.Metal parts are sometimes passivated with hydrogen sulfide. Catalysts used in hydrodesulfurization are routinely activated with hydrogen sulfide.Hydrogen sulfide was a reagent in the qualitative inorganic analysis of metal ions. In these analyses, heavy metal (and nonmetal) ions (e.g., Pb(II), Cu(II), Hg(II), As(III)) are precipitated from solution upon exposure to H2S. The components of the resulting solid are then identified by their reactivity.
Applications
● As a component in calibration gas mixtures for environmental monitoring systems
● In various chemical reactions.
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