240 results about "Methyl disulfide" patented technology

The invention discloses a gas purification method for treating low-concentration organic compounds, in particular to a gas purification method aiming at the following malodorous compounds such as sulfides of dimethyl sulfide (DMS), dimethyl disulfide (DMDS), sulfurated hydrogen (H2S) and the like as well as formaldehyde, acetic acid, isopropyl alcohol, acetone and the like. The method comprises: at least one catalyst adsorption unit in parallel connection and / or in series connection; and / or an ozone generating unit which can provide ozone to the catalyst adsorption unit to serve as a component that can strengthen the adsorption function of catalyst and is easy to be treated or is harmless after low temperature oxidation reduction or decomposition reaction, so as to greatly improve the treatment efficiency and extend the service life of the catalyst adsorption material.

Gas streams containing non-condensible gases (NCG's) including reduced sulfur compounds, such as hydrogen sulfide, dimethyl sulfide, dimethyl disulfide and mercaptans, are treated to remove the NCG's from the gas stream. Following an optional initial gas-liquid contact to cool the gas stream to its adiabatic dewpoint and to remove particulates, the gas stream is subjected to an intimate gas-liquid contact with aqueous chlorine dioxide, in one or more contact stages, to oxidize the reduced sulfur compounds and other oxidizable compounds present in the gas stream, and then the gas stream is passed through an entrainment separator to remove entrained liquid droplets. Acidic gases produced in the oxidization stage and residual chlorine dioxide generally are removed from the gas steam by intimate gas-liquid contact of the gas stream with an aqueous neutralizing and reducing solution, in one or more contact stages, and ten the gas stream is passed through an entrainment separator to remove entrained liquid droplets.

The invention relates to a chemical absorbent, in particular to a chemical absorbent for deodorization. In order to overcome the technical problem, the invention proposes the technical scheme that the chemical absorbent consists of the following components in parts by weight: 10-20% of strong base, 5-7% of oxidant,0.2-0.5% of active agent, 0.05-2% of corrosion inhibitor, 0.05-2% of pour point depressant, 0.05-8% of desulfurizer, 0.05-4% of catalyst and 60-80% of water. The chemical absorbent has the advantages of overcoming the low removal rate of pure alkaline liquor to hydrogen sulfide in the prior art, improving the absorptivity of sulfur compounds in waste gas and removing organic sulfur, such as sulfur alcohol, sulfur ether, dimethyl disulfide, and the like. The waste residue of sodium sulfide which is generated after treatment is relatively stable and is easy to decompose, thereby avoiding secondary pollution. The chemical absorbent has longer use time than the traditional absorbent and high reaction speed in removing the sulfur compounds.

The primary aspect of the Controlled Odor Mimic Permeation System (COMPS) is that it provides a field deployable instant and reproducible source of known amounts of target odors. This technology consists of a permeable polymer container (chosen to suit target odor and release rate required), stored inside a non-permeable package. The design allows for the pre-equilibration of the target odors such that the outer surface of the inner package can saturate with odor during storage. Removal of the inner item then provides an instant and reproducible source of known target vapor flux. We have successfully demonstrated this technology by placing the target odor chemicals within permeable membranes such as low density polyethylene which are then sealed within a non-permeable membranes such as metallized polyester. This design has multiple advantages including preventing cross contamination when storing multiple odor targets (5-10 targets are commonly employed) as well as being light-weight disposable, low unit cost potential, no external power / operating unit / machinery / hardware, simple to use and providing a known reproducible concentration of the target odors to the detector in the field. The applications of these COMPS include the whole range of biological (e.g. detector dog) and electronic (e.g. field sensors) detectors with examples such as explosives (e.g. 2-ethyl-1-hexanol simulating plasticized explosives), drugs (e.g. 3,4-methylenedioxybenzaldehyde simulating ecstasy), human remains (including dimethyl disulfide and pentanoic acid) and live human scent (including 5-heptene-2-one and nonanol).

The invention discloses an efficient sulfur solving agent for sulfur deposits in a sulfur-containing gas well, relating to the field of the sulfur solving agent. The efficient sulfur solving agent is composed of dimethyl disulfide, sodium hydroxide aqueous solution, sodium bisulfide and N, N-dimethylformamide. The efficient sulfur solving agent is high in sulfur solving capability, high in sulfur solving speed and low in cost, and thereby can be widely applied to sulfur solving of sulfur deposits in the well tube of a high sulfur-containing gas well and a surface pipeline. At 25 DEG C, 1 g of sulfur solving agent is capable of solving 1.62 g of sulfur and the time of solving is only 2.27 min; therefore, the sulfur solving effect of the efficient sulfur solving agent is obviously superior to that of the sulfur solving agent in the prior art.

The invention discloses duck essence and a production process thereof. The duck essence is prepared from the following raw materials: 2-methylpentaldehyde, valeraldehyde, hexanal, 2-methylbutyraldehyde, 3-methylthiopropanal, octanal, heptanal, dimethyl trisulfide, 1-octylene-3-alcohol, nonanal, capraldehyde, trans-2-decenal, 2-nonenal, trans-2-cis-6-nonadienaldehyde, trans, cis-2,4-octadienal, dimethyl disulfide, anise camphor, 4-hydroxy-2,5-methyl-3(2H)-furanone, 2-acetylpyrazine, 2-methyl-3-furanthiol, di(2-methyl-3-furyl) disulfide, 4-methyl-5-ethoxy thiazole, 2-methylpyrazine, 2,3,5-trimethylpyrazine, 2-ethyl-3,5 (or 6)-dimethyl pyrazine, furfuryl disulfide, 2,4,5-trimethyl thiazole, 2,4,6-tri-isobutyl-1,3,5-dithiazine, 1,6-ethanthiol, 2-pentylthiophene, furfuryl mercaptan, 4,5-dimethyl-2-isobutyl-3-thiazoline, guaiacol, delta-dodecalactone, 2,4-decadienal, trans, trans-2,4-nonadienaldehyde, anisic aldehyde and an oil-soluble solvent. The invention further discloses a production process of the duck essence.

The invention provides a liquefied petroleum gas fuel for LP gas fuel cells for being fed to a fuel cell system through spontaneous vaporization, which fuel has a C2 hydrocarbon compound content of 3 vol. % or less, a C4 hydrocarbon compound content of 3 vol. % or less, a total sulfur content of 10 ppm by mass or less, a carbonyl sulfide content in terms of sulfur content of 2 ppm by mass or less, a methyl mercaptan content in terms of sulfur content of 3 ppm by mass or less, a content of sulfur compounds having a boiling point equal to or higher than that of dimethyl disulfide in terms of sulfur content of 2 ppm by mass or less, a methanol content of 50 ppm by mass or less, and a water content of 50 ppm by mass or less, the balance being a C3 hydrocarbon compounds. The liquefied petroleum gas fuel for LP gas fuel cells ensures effective performance of a desulfurizing agent even when used in a minimum amount, thereby enhancing desulfurization performance, prevents damaging of a reforming catalyst employed in a reformer for producing hydrogen provided on the downstream side of a desulfurizer, and realizes reliable operation of the reformer and consistent generation of electric power. The invention also provides a method for desulfurizing the liquefied petroleum gas fuel, and a fuel cell system employing a hydrogen-containing gas produced through reforming of the liquefied petroleum gas fuel which has been desulfurized through the desulfurization method.