2269results about "Sulfur preparation/purification" patented technology

A method for making sulfur-graphene composite material is disclosed. In the method, a dispersed solution including a solvent and a plurality of graphene sheets dispersed in the solvent is provided. A sulfur-source chemical compound is dissolved into the dispersed solution to form a mixture. A reactant, according to the sulfur-source chemical compound, is introduced to the mixture. Elemental sulfur is produced on a surface of the plurality of graphene sheets due to a redox reaction between the sulfur-source chemical compound and the reactant, to achieve the sulfur-graphene composite material. The sulfur-graphene composite material is separated from the solvent.

A process for removing hydrogen sulfide, other sulfur-containing compounds and/or sulfur and mercury from a gas stream contaminated with mercury, hydrogen sulfide or both. The method comprises the step of selective oxidation of hydrogen sulfide (H₂S) in a gas stream containing one or more oxidizable components other than H₂S to generate elemental sulfur (S) or a mixture of sulfur and sulfur dioxide (SO₂). The sulfur generated in the gas stream reacts with mercury in the gas stream to generate mercuric sulfide and sulfur and mercuric sulfide are removed from the gas stream by co-condensation.

The invention relates to a reclaiming system and a process for low-temperature methanol washing integrated Claus sulfur of coal gas and natural gas. The system is additionally provided with a Claus tail gas washing tower and uses sulfur-free methanol saturated by CO2 from a CO2 product tower as a washing agent, and the washed liquid returns to an H2S concentrating tower; through combination of heating, gas stripping and pressure adjustment, concentration of H2S in acid gas washed by methanol is adjusted flexibly; at the same time, the system is additionally provided with a tail gas pre-heater before hydrogenation reaction to compensate heat loss of a hydrogenation reaction system. The process mainly comprises the following steps: removing H2S-CO2 gas, condensing H2S, reclaiming Claus sulfur, hydrogenising and reducing the gas, selectively absorbing and desulfurizing saturated cold methanol. The process has the advantages that the process can efficiently, flexibly, safely and energy-conservatively treat carbonyl gas with different pressures, temperatures, water content and sulfur concentration; and total sulfur reclamation ratio can reach more than 99.9 percent. The concentration of the H2S in emptied tail gas is below 25 mg/Nm3, so the H2S gas can meet the requirement of environmental protection, and can be exhausted directly without being burnt.

The present invention belongs to gas producing technology. The absorbing liquid for eliminating sulfide from gas mixture includes main absorbent comprising steric hindrance amine and N-methyl diethanolamine; cosolvent of one or several of sulfolane, N-methyl pyrrolidine, polyglycol dialkyl ether, morpholine and its derivative; catalyst of one or several of C2-C12 alkanolamine, piperazine and its derivative, quinoline, urea and metal phthalocyanine complex. Using the absorbing liquid can eliminate H2S, COS, mercaptan, thioether and other sulfide in less steps.

The invention relates to a method for recycling sulfur from acid gases containing hydrogen sulfide, comprising the following steps: (a) air supply; (b) acid gas pretreatment; (c) mixture; (d) primary direct catalytic oxidation; (e) primary sulfur condensation; (f) process gas reheating; (g) secondary direct catalytic oxidation; (h) secondary sulfur condensation; (i) sulfur re-separation; (j) degasification in a liquid sulfur tank; and (k) tail gas burning. When the volume concentration of H2S in the acid gases in the prior art is 1-15%, the recycle rate of sulfur can reach over 99% by the method of the invention, and the emission load of H2S in the acid gases processed by the method of the invention meets the emission requirement of Integrated Emission Standard of Air Pollutants (GB16297-1996).

The present invention provides an environmentally beneficial process using concentrated sunlight to heat radiation absorbing particles to carry out highly endothermic gas phase chemical reactions ultimately resulting in the production of hydrogen or hydrogen synthesis gases.

A process for removing sulfur from a H₂S-containing gas stream is disclosed. A preferred embodiment of the process comprises incorporating a short contact time catalytic partial oxidation reactor, a cooling zone, and a condenser into a conventional refinery or gas plant process, such as a natural gas desulfurizer, a hydrotreater, coker or fluid catalytic cracker, in which sulfur removal is needed in order to produce a more desirable product. An H₂S-containing gas stream is fed into a short contact time reactor where the H₂S is partially oxidized over a suitable catalyst in the presence of O₂ to elemental sulfur and water.

Sour natural gas is processed to remove the sulfur compounds and recover C4+/C5+ hydrocarbons by scrubbing the gas with an amine solution to remove most of the sulfur, followed cooling the gas to remove C4+/C5+ hydrocarbons and more sulfur compounds as liquid condensate to produce a gas having less than 20 vppm of total sulfur. The condensate is sent to a fractionator to recover the C4+C5+ hydrocarbons. The sulfur and hydrocarbon reduced gas is contacted first with zinc oxide and then nickel, to produce a gas having less than 10 vppb of total sulfur which is passed into a synthesis gas generating unit to form a very low sulfur synthesis gas comprising a mixture of H2 and CO. This synthesis gas is useful for hydrocarbon synthesis with increased life of the hydrocarbon synthesis catalyst and greater hydrocarbon production from the hydrocarbon synthesis reactor. Contacting the synthesis gas with zinc oxide further reduces the sulfur content to below 3 vppb.

The invention discloses a comprehensive recovery method of complex polymetal sulphide ore containing copper, lead and zinc and adopts dressing-metallurgy combination method and hydrometallurgy-pyrometallurgy combination method to recover metals. The recovery method comprises the following steps: first performing bulk flotation to the complex polymetal sulphide ore, fine grinding the obtained concentrate, leaching by using two-step counter flow oxygen pressure leaching process, extracting and separating copper and zinc from the obtained leachate, electrodepositing the strip liquor of copper-loaded organic phase to obtain cathode copper, cleaning the obtained raffinate and electrodepositing to obtain cathode zinc; pressurizing leaching residue to perform flotation separation and obtain sulfur concentrate and lead silver residue, distilling sulfur concentrate to obtain sulfur; performing lead smelting process to lead silver residue to obtain electrolytic lead product and lead anodic slime; and comprehensively recovering noble metals such as gold, silver and the like from lead anodic slime. The method can greatly improve the metal recovery rate, resource utilization and the economic efficiency of mines and generate a lot of sulfur so as to obviously reduce the sulfur dioxide pollution to the atmosphere.

Naturally occurring lipids of vegetable and animal origin are broken into smaller molecules, and used as dewatering aids. The process of breaking the molecules include transesterification, interesterification, and saponification followed by acidulation. The modified lipid molecules can adsorb on the surface of the particles to be dewatered and greatly enhance their hydrophobicity, which will help increase the rate of dewatering and hence reduce cake moisture. The modified lipids are more effective dewatering aids than the naturally occurring unmodified lipids, possibly because they can more readily form close-packed monolayers of hydrophobes on the surface of the particles.

The invention relates to a catalyst for decomposing hydrogen sulfide by photocatalysis and a preparation method of hydrogen and liquid sulfur by employing same. The catalyst comprises a carrier, active component and assistant and has the characteristics that the carrier is one or more selected from vanadate, niobate and tantalate, the active component is one or more selected from alkali metal hydroxide, alkaline earth metal hydroxide, alkali metal nonmetal oxysalt, alkali metal nonoxysalt, alkaline earth metal nonmetal oxysalt and alkaline earth metal nonoxysalt and the assistant is lanthanide oxide or VIII group oxide. The catalyst of the invention can be used for preparing hydrogen and liquid sulfur so that the produced sulfur is easy to be separated from the catalyst, the catalyst can be recycled and the sulfur contained in hydrogen sulfide can be fully recycled, thus realizing the comprehensive utilization of hydrogen sulfide.

In a known process and system wherein hydrogen sulfide is removed from a gaseous stream, using a non-aqueous scrubbing liquor which can be an organic solvent for elemental sulfur such as a phenylxylyl ethane in which are dissolved sulfur and a reaction-promoting amine base such as a tertiary amine, sulfur dioxide is added to the sulfur-amine nonaqueous sorbent (or advantage is taken of SO2 which may already be present in the gas stream) to obtain better H2S removal, lower chemical degradation rates, and lower rates of formation of byproduct sulfur salts such as sulfates.

The invention discloses a low temperature Claus sulfur recovery process. The process mainly comprises a thermal reaction section, a catalytic reaction section and a tail gas incineration section, wherein in a combustion furnace of the thermal reaction section, partial hydrogen sulfide reacts with oxygen to be converted into sulfur dioxide, the hydrogen sulfide and the sulfur dioxide undergo a Claus reaction to generate sulfur, and process gas after sulfur separation enters the catalytic reaction section; in the reactor of each stage of the catalytic reaction section, the hydrogen sulfide and the sulfur dioxide under conventional Claus reaction, catalyst reactivation, sub-dewpoint and sub-solid point low temperature Claus reaction in sequence; after the catalyst reaction section, the tail gas which is subjected to sulfur separation enters the tail gas incineration section, and the tail gas is incinerated and exhausted in the tail gas incineration furnace. The process adopts a lower reaction temperature, contributes to performance of chemical equilibrium towards the direction of sulfur generation, so that conversion rate and recovery rate of sulfur are improved. Moreover, the process has the advantages of simple process flow, relative small equipment and investment, low operation cost and more contribution to environmental protection. The invention also discloses a device for the low temperature Claus sulfur recovery process.

The invention belongs to the technical field of sulfur recovery, and particularly relates to a sulfur recovery process for reducing SO2 emission. According to the sulfur recovery process, a thermal reaction unit, a catalytic reaction unit and a tail gas purification unit are utilized; based on the traditional Claus and SCOT tail gas treatment process, an ammonia water absorption tank is additionally arranged for removing H2S from purified tail gas, so as to ensure that the H2S content in the purified tail gas is lower than 5 mg/m<3>; waste ammonia water is sent to a sewage stripping unit for treating; through the adoption of the sewage stripping device, H2S and ammonia can be respectively extracted; the extracted H2S is returned to a sulfur recovery device for sulfur recovery, and the extracted ammonia is returned to the ammonia water absorption tank for cyclic utilization; finally, the flue-gas SO2 emission concentration for the sulfur recovery device can be reduced below 100 mg/m<3>, the new environmental protection standard to be executed is satisfied, and a novel method for building a new sulfur recovery device with a small investment and low operating cost is provided. The sulfur recovery process is excellent in absorption effect, simple to operate, low in expense, environment-friendly, and economical.

The invention relates to a purified gas treatment process of a sulfur recovery device. The purified gas treatment process comprises a thermal reaction phase, a catalytic reaction phase and a tail gas purifying treatment phase, wherein in the tail gas purifying treatment phase, the Claus tail gas generated in the catalytic reaction phase is sequentially subjected to a hydrogenation reaction, cooling in a rapid quenching tower and amine liquid absorption, then the purified tail gas is fed to alkali liquor to be subjected to H2S removal treatment, and the tail gas removed from H2S is combusted and then discharged; the amine liquid amine-rich liquid absorbing H2S is fed to a regeneration tower to be regenerated, the regenerated acid gas is mixed with the acid gas, and then returned to the thermal reaction phase to further recover elemental sulfur; the exhausted lye removed from H2S is subjected to caustic dross biological treatment or acidic water stripping treatment. With adoption of the purified gas treatment process disclosed by the invention, H2S in the purified gas can be removed to 5 mg/m<3> below, the SO2 content in the smoke is obviously reduced within the reduction range of 100-1000 mg/m<3>; the exhausted lye treatment method is further provided, and the exhausted lye is subjected to the caustic dross biological treatment or the acidic water stripping treatment, so that pollution can be reduced.

The invention provides a system and a method for treating waste acid gas. The system for treating the waste acid gas comprises a rich acid gas thermal reaction treating unit, a claus treating unit, a claus tail gas and poor acid gas burning unit, a burnt tail gas catalytic oxidation acid-making unit, a secondary conversion acid-making unit and a tail gas reheating unit. According to the system for treating the waste gas, the sulfur recovery rate of the whole system for treating the acid gas reaches above 99.99%, the concentration of SO2 in the tail gas emitted to atmosphere is less than 100mg/m<3>, the conversion rate and the emission concentration can meet the highest emission limit standards in the industry, and no waste liquid is discharged from the system.

A catalyst used directly for oxidative desulfurizing to H2S gas contained acidic gas is proportionally prepared from iron oxide, aluminum oxide, titanium oxide, zinc oxide, and vanadium oxide by co-deposition method. It has high activity, selectivity and H2s conversion rate.

The invention relates to an SWSR (SunWay Sulfur recovery)-1 device and technique. The invention relates to a tail gas treatment combination device and technique by adopting Claus sulfur recovery and ionic liquid cycle absorption process. The device comprises a sulfur production burning furnace, a Claus reaction system, a sulfur production tail gas incinerator, a rich SO2 process gas heat exchanger, an SO2 absorption tower, a rich liquid pump, a lean and rich liquid heat exchanger, an SO2 regeneration tower and a lean liquid feed pump. The technique comprises the steps: (1) enabling hydrogen sulfide-containing acid gas to generate a Claus reaction, and recovering sulfur and heat energy in the reaction process; (2) burning sulfur production tail gas to generate SO2; (3) removing SO2 from rich SO2 process gas through an ionic liquid absorption tower; and (4) feeding rich SO2 ionic liquid into a regeneration tower for separating and regenerating sulfur. The ionic liquid is an aqueous solution which takes organic positive ions and inorganic anions as main components and a little amount of activating agent and antioxidant as additives. The SWSR-1 device and technique are low in equipment investment, high in material safety, short in technique flow, safe and reliable in technique processes, high in SO2 recovery rate, and the content of SO2 in effluent gas can be reduced by 50ppm below which can meet the national regulation requirement.

A syngas treatment plant is configured to remove sulfurous compounds and carbon dioxide from shifted or un-shifted syngas in a configuration having a decarbonization section and a desulfurization section. Most preferably, the solvent in the decarbonization section is regenerated and cooled by flashing, while the solvent is regenerated in the desulfurization section via stripping using external heat, and it is still further preferred that carbonylsulfide is removed in the desulfurization section via hydrolysis, and that the so produced hydrogen sulfide is removed in a downstream absorber.

The invention provides a degassing technique for liquid sulfur. The degassing technique can be used for solving the technical problems of the prior art that local condensation easily occurs in a bubbler, the bubbler is easily blocked and a degassing effect is unstable. The degassing technique comprises the following steps: A) entering into a degassing section after sealing the liquid sulfur, utilizing a liquid sulfur degassing pump to pressurize and send the liquid sulfur into a gas-stripping degassing column arranged in the degassing section, and circulating the liquid sulfur inside and outside the gas-stripping degassing column; B) heating compressed air and then introducing the compressed air into a bubbling device on the lower part of the gas-stripping degassing column, contacting the compressed air with the liquid sulfur in the gas-stripping degassing column, removing H2S dissolved in the liquid sulfur and burning the removed H2S after sending the removed H2S to a tail gas incinerator or an acid gas combustion furnace; and C) after overflowing the degassed liquid sulfur from the degassing section to a storage section, sending the liquid sulfur by a liquid sulfur end product pump. The degassing technique can be used for reducing the content of H2S in the liquid sulfur, preventing the bubbling device from being blocked, promoting the liquid sulfur degassing effect and achieving the content of the H2S in the liquid sulfur being less than 10ppm.