TH36600B - The process of removing hydrogen sulfide from the gas stream. - Google Patents

Abstract

DC60 (24/11/54) Processes and systems for removing hydrogen sulfide from loud gas streams. For example, natural gas, a high sulfur gas stream containing H2S, is exposed to anhydrous solution It is an insoluble absorbent liquid containing organic solvent for sulfur Sulfur element dissolved organic base to catalyze the reaction. and organic solvents, which are suitable for maintaining the solubility of intermediate polysulfides that may separate when they are formed during the processing of polysulfides. process Hydrogen sulfide (H2S) gas is absorbed in this liquid. and then reacts with sulfur that is dissolved in the presence of a base to form polysulfide molecules. This solution is then sent to the reactant where there is sufficient resting time. to be prepared by the polysulfide reaction to the level of completeness as desired From the reagent the solution flows to the regenerator, where the solution is oxidized (eg by exposure to air) to form dissolved sulfur and water. The solution temperature is then lowered. To form sulfur crystals that can be removed by precipitation by gravity itself, filtration, centrifugation or other separation methods, after which the sulfur crystals have been removed. The dissolved sulfur remains in the enough solution Therefore, when this solution is heated again and was brought back to the absorber again. The amount of sulfur contained It is sufficient to react with the incoming H2S gas, the process and the system for removing hydrogen sulfide from the gas stream loudly. one example Natural gas, a high sulfur gas stream containing H2S to be exposed to anhydrous solution It is an insoluble absorbent liquid containing organic solvent For sulfur elements, dissolved sulfur elements, organic bases to stimulate the reaction. and dissolved organic substances, which are suitable substances for preservation. of the solubility of median polysulfides that may be separated when they are formed during the processing of the process. Hydrogen sulfide (H2S) gas is absorbed in these items. and then reacted with the sulfur that was dissolved in the presence of a base to form polysilphide molecules The solution is then sent to the reaction tank, where there is sufficient holding time to provide with the polysulphide reaction to the level tank. complete as desired From the reaction tank the solution flows to the regenerator, where the solution is oxidized (eg by exposure to air) to form dissolved sulfur and water. The temperature of the solution is then lowered. lower to form sulfur crystals that can be removed by spontaneous gravity precipitation, filtration, centrifugation or other separation methods, after which the sulfur crystals have been removed The dissolved sulfur remains in the enough solution Therefore, when this solution is heated again and was brought back to the absorber again. The amount of sulfur present is sufficient to react with the incoming H2S gas.

Claims (4)

Disclaimers (all) that will not appear on the advertisement page: 1. The process of removing H2S from the gas stream. Consisting of the phase of (a) exposure of a H2S-containing gas stream with an absorbent liquid containing Anhydrous solvent containing dissolved sulfur And a base containing tertiary amines, it is important that The density and concentration are sufficient to drive the adsorbed H2S-converted reaction. The liquid and reacts with the dissolved sulfur to form non-volatile polysulfides that (B) The conversion of non-volatile polysulfide to be dissolved in the adsorbent liquid. The sulfur remains dissolved in the liquid by contact with the liquid from step (a) to the oxidizing gas (c), the conversion at a minimum of the dissolved sulfur. The liquid from step (b) to solid sulfur particles and (d) the separation of the sulfur solid from step (c) from the liquid. 2. Process according to claim 1, where the solvent Without such water it will not be able to Soluble in water 3. Process according to claim 2, where the sorbent liquid includes a solubilizer to maintain the solubility of methanyan polysulfide. That may have been removed During the process 4. The process of claim 3 continues to include the recycling of the The absorbent fluid is removed from the sulfur for further exposure to the H2S-containing gas. 5. Process according to claim 3, where the anhydrous solvent has the ability to absorb gas. The dissolution of sulfur ranges from approximately 0.05 to 3.0 g / mol of sulfur per liter of solution. 6. Process in accordance with claim 3, where such bases are selected from a group consisting of: 2-) dibutylaminos) ethanol, N-methyl dicyclohexylamine N-methyl diethanolamine, tributylamine, dodikyl dimethylamine Ultra decyl dimethylamine Hexadecyl methylamine 7. Process according to claim 3, where the aqueous solvent is selected from the group. Containing benzyl alcohol, benzyl alcohol, 3-phenyl-1-propanol tri (ethylene glycol) ethyl alcohol polyether 8. Process according to claim 3, where aqueous solvent is selected from Group consisting of 1,2,3,4 tetrahydro, phthalene N, N-dimethyl, aniline, diphenyl ether, dibenzyl ether, partially hydrogenated diphenyl diphenol ethane. 9. The process of claim 3, where the precipitated sulfur is also purified. Solvent washing to remove a small amount of the aqueous solvent residue 1 0. Process according to claim 3, where the sulfur-salt side products are removed. From anhydrous solvent By rinsing the solvent with water or an aqueous alkaline solution. When the aforementioned solvent cannot be in water 1 1. Process according to Clause 4, where at least The dissolved sulfur fraction It is converted into ice by cooling the absorbent liquid. That occurred after the oxidation The release of such polysulfide to a temperature that precipitation of sulfur particles is The above 1 2. Process according to claim 11, where the sorbent liquid has a temperature range of approximately 15C to 70C prior to cooling 1. 3. Process according to claim 12, where the sorbent liquid is cooled to 5 C.20 C to form the aforementioned sulfur precipitation 1. 4. Process according to claim 11, where sufficiently dissolved sulfur remains Remaining in the adsorbent fluid is formed after removal of precipitated sulfur, which when solution It is returned to the adsorbent for recycling in the process. A sufficient amount of sulfur is available to react with the incoming H2S gas.