105results about How to "High desulfurization precision" patented technology

The invention discloses a catalyst for hydrolyzing active carbon-based COS under the condition of low temperature and a preparation method thereof, wherein a carrier of the catalyst is active carbon, and active compositions of the catalyst are alkali materials and metal oxide. The catalyst can remove COS in air at a low temperature (between 30 and 100 DEG C) and remove H2S generated by hydrolysis together. The preparation method comprises the following steps: firstly, using running water and distilled water to wash the active carbon, and drying the active carbon for 2 to 4 hours at a temperature of between 110 and 180 DEG C, wherein the active carbon can be coal and coconut husks; secondly, using a 1 mol/L KOH solution to boil the washed active carbon for 1.5 to 2 hours, performing modification treatment, and using distilled water to wash the solution until the pH value is approximately 6.0; thirdly, selecting one or more metallic salt solutions to soak the active carbon, performing modification treatment, and performing ultrasonic soakage for 0.5 to 1 hour, wherein the content of a soaking liquid is 10 to 90 percent of the mass ratio of the active carbon, and the volume of the soaking liquid is as follows: 20 milliliters of the soaking liquid is added into 10 grams of the catalyst; fourthly, drying the soaked active carbon for 2 to 6 hours in a 120 DEG C constant-temperature drying cabinet, and activating the catalyst for 2 to 4 hours under the protection of 300 to 600 DEG C N2; and fifthly, performing ultrasonic soakage on the activated catalyst in the fourth step in an alkali solution for 0.5 to 1 hour.

The invention provides an active carbon based catalyst for hydrolyzing and catalyzing carbonyl sulfur in low temperature, which is characterized in that the catalyst takes active carbon as a carrier and is prepared by the following method: washing the active carbon, drying the active carbon for 2-4 hours under 100-140 DEG C; impregnating the active carbon in the (A) step for 6-12 hours with the impregnation liquid of alkaline substances or metal oxides or organic alcohol amine, wherein, the mass content of the alkaline substances or the metal oxides or the organic alcohol amine accounts for 5-30 percent of that of the active carbon; drying the impregnated active carbon for 2-6 hours under the constant temperature of 100-140 DEG C and then activating the active carbon for 2-4 hours under the temperature of 300-500 DEG C and the protection of N2. The catalyst can be used for catalyzing and hydrolyzing COS and removing H2S; furthermore, the catalyst can remove the COS in the gas under the temperature of 30-100 DEG C, ensure the conversion rate of the COS to be larger than 90 percent and remove the H2S generated in hydrolysis at the same time. The COS concentration which is between 100-1500ppm has a wide adaptive range, high desulfurization accuracy and higher breakthrough sulfur capacity.

The invention provides a carbonyl sulfide hydrolysis catalyst prepared by using Co-Ni-Al-like hydrotalcite as a precursor and a preparation method thereof. The preparation method comprises the following steps of: at room temperature, dissolving cobalt nitrate, nickel nitrate and aluminum nitrate in distilled water to prepare solution A, wherein the total metal molar number is 0.75mol, n(Co2+):n(Ni2+) is equal to 0.25 to 1, and n(Co2++Ni2+):n(Al3+) is equal to 1.5 to 4; by using NaOH and Na2CO3 as precipitators, dissolving 0.05 moles of the NaOH and the Na2CO3 in the distilled water to prepare solution B; adding the solution A into the solution B dropwise to obtain suspension; and crystallizing the suspension in water bath, and then performing vacuum filtration, washing the crystals by the distilled, drying the crystals, baking the crystals in air, milling the crystals, tabletting the powder and screening the powder to obtain the hydrotalcite derivational compound oxide catalyst. The hydrolysis catalyst prepared by the method can be remove COS in gases, and simultaneously remove H2S generated in hydrolysis, and the desulfurization precision is high; and the hydrolysis catalyst can be used at the low temperature, the operational temperature is between 30 and 80 DEG C, and the energy consumption is low.

The invention provides a sulfur recovery technology realizing low sulfur emission. The sulfur recovery technology comprises a combustion furnace, a first-stage Claus reactor, a second-stage Claus reactor, a selective hydrogenation reduction reactor, a selective oxidation reactor and two adsorption desulfurization towers capable of being connected in series or parallel, and the devices are sequentially connected in series; the total sulfur conversion factor of process effluent gas is that SO2 is smaller than or equal to 10 mg/m<3> through proper selection of various catalysts and desulfurizers and accurate control of process conditions of steps. The desulfurizers after breakthrough are subjected to in-situ thermal regeneration by inert gas at the temperature of 250-300 DEG C, regenerated outlet gas returns to the combustion furnace, a condenser I behind the combustion furnace, a condenser II behind the first-stage Claus reactor, a condenser III behind the second-stage Claus reactor, a condenser IV behind the selective hydrogenation reduction reactor or a condenser V behind the selective oxidation reactor, sulfide such as elemental sulfur, H2S,SO2 and the like in the regenerated gas is recovered, and the total sulfur conversion factor of exhaust tail gas in the regeneration period of the desulfurization towers is that SO2 is smaller than or equal to 10 mg/m<3>. The sulfur recovery technology realizing low sulfur emission has the advantages of the low sulfur emission, the long-term operation of the desulfurizers, the high desulfurization capacity, the small number of replacement times, the low expenses and the like.

The invention relates to a fine desulfurization process by a dry process for natural gas. The process is three-stage normal-temperature fine desulfurization by the dry process for the natural gas: the first-stage desulfurization is crude removal of hydrogen sulfide, and uses a normal-temperature ferric oxide desulfurizer; the second-stage hydrogen sulfide fine removal reactors use a normal-temperature zinc oxide desulfurizer; and the third-stage organic sulfur fine removal reactors use a normal-temperature molecular sieve desulfurizer, wherein the normal-temperature ferric oxide desulfurizer and the normal-temperature molecular sieve desulfurizer can be regenerated for repeated use. The first-stage reactors, the second-stage reactors and the third-stage reactors must be one running reactor and one standby reactor which are mutually switched for use. The process prolongs the regeneration period of organic sulfur adsorbents, avoids the interference of inorganic sulfur on the absorption removal of the organic sulfur, reduces energy consumption and cost, and improves desulfurization accuracy.

The present invention provides a low sulfur emission sulphur recovery process, which comprises a burning furnace, a first stage Claus reactor, a second stage Claus reactor, a selective hydrogenation reduction reactor, a selective oxidation reactor, and two adsorption desulfurization towers capable of being connected in a series parallel connection manner, wherein the burning furnace, the first stage Claus reactor and the second stage Claus reactor are sequentially connected in series. According to the present invention, with the appropriate selection of each catalyst, the appropriate selection of the desulfurization agent, and the accurate control of each step process condition, the total standard sulfur in the process emission gas is that SO2 is less than or equal to 10 mg/m<3>; after the desulfurization agent penetrates, 250-300 DEG C inert gas is used to perform in-situ thermal regeneration, the regeneration outlet gas returns to the burning furnace, the condenser after the burning furnace, the condenser after the first stage Claus reactor, the condenser after the second stage Claus reactor, the condenser after the selective hydrogenation reduction reactor, or the condenser after the selective oxidation reactor to recover elemental sulfur, H2S, SO2 and other sulfides in the regeneration gas, and the total standard sulfur in the evacuation tail gas during the desulfurization tower regeneration process is that SO2 is less than or equal to 10 mg/m<3>; and the low sulfur emission sulphur recovery process has advantages of low sulfur emission, long desulfurization agent operating, high desulfurization capacity, less replacement frequency, low cost and the like.

The present invention provides a low concentration acid gas low-sulfur emission sulphur recovery process. According to the present invention, low concentration acid gas having a H2S content of less than 5% is treated by a selective oxidation reactor and two adsorption desulfurization towers capable of being connected in a series parallel connection manner so as to achieve the desulfurization purpose; a H2S selective oxidation catalyst is filled in the selective oxidation reactor, and a thermal renewable catalytic oxidation adsorption desulfurization agent is filled in the adsorption desulfurization tower; with the appropriate selections of the catalyst and the desulfurization agent, and the accurate control of each step process condition, the total standard sulfur in the process emission gas is that SO2 is less than or equal to 10 mg/m<3>; with the thermal regeneration, the service life and the desulfurization capacity of the catalytic oxidation adsorption desulfurization agent are substantially improved; and the process has advantages of low-sulfur emission, sulphur recovery rate of close to 100%, long desulfurization agent service life, high desulfurization capacity, less replacement frequency, low cost, good desulfurization agent unloading and scrap treatment conditions, safety, and the like.

The invention discloses an iron-zinc-based composite lignin activated carbon desulfurizer and a preparation method thereof. Lignin extracted from masson pine papermaking black liquid is carbonized and activated to obtain lignin activated carbon, lignin activated carbon is dissolved in a zinc salt solution, an iron salt solution and a surfactant are added for reacting for 0.5-2 hours, then an alkaline solution with certain concentration is used for a titration mixed ultrasonic reaction for 2-4 h, a high-pressure reaction still is used for controlling the temperature to range from 100-200 DEG C for reacting for 8-24 h, and the iron-zinc-based composite lignin activated carbon desulfurizer is prepared. The desulfurizer is simple in preparation technological process and good in desulfurization effect, the precision of activated carbon desulfurization is improved through iron-zinc-based composite lignin activated carbon, and high temperature can be resisted. By the adoption of the lignin extracted from the papermaking black liquid, it is truly achieved that waste is turned into wealth, and practical use value and social value are achieved.

The invention provides a method for preparing a semicoke supported multi-element nano metal oxide desulfurization and denitrification adsorbing agent. The method is characterized in that brown coal is used as the raw material, and pyrolysis and steam gasification are performed on the brown coal under N2 atmosphere by performing ultrasonic-assisted impregnation on metal salts serving as active component precursors to prepare a semicoke supporter and redistribute active components so as to directly obtain semicoke supported multi-element nano metal oxide. The method has the advantages that the low-metamorphic-grade brown coal relatively rich in reserves and the cheap metal nitrate are used as the raw materials prepare the desulfurization agent, and the method is wide in raw material source and low in production cost; compared with impregnation supporting using the semicoke supporter, the method simplifies the operation flow of early coke-making, reduces energy consumption, avoids supporting capacity reduction caused by pore structure changes caused by the fact that pore passages are blocked by tar and the like, is beneficial to the sufficient and even distribution of the active components on the surface of the supporter, increases the desulfurization precision of the desulfurization agent and increases the effective desulfurization time of the desulfurization agent.

The invention relates to a carbonyl sulfide (COS) hydrolysis and a preparation method thereof; the hydrolysis is prepared by taking hydrotalcite like compound as a precursor and is used for low-temperature carbonyl sulfide hydrolysis; the invention is characterized in that: divalent metal saline solution and trivalent metal saline solution are mixed according to mole ratio, the mixed solution of sodium hydroxide and sodium carbonate is added by adopting a coprecipitation method, the crystallization temperature is 40-80 DEG C, the solution flow rate is controlled to be 3.6mL/min under being stirred, the sediment pH is controlled, and then filtration, washing, drying and baking are carried out to obtain derive composite oxide catalyst of the hydrotalcite like compound. The catalyst prepared by taking the hydrotalcite like compound as the precursor in the invention has obvious catalytic activity and high selectivity.

The present invention provides a low sulfur emission sulphur recovery process, which comprises a burning furnace, a first stage Claus reactor, a second stage Claus reactor, a selective hydrogenation reduction reactor, a selective oxidation reactor, and two adsorption desulfurization towers capable of being connected in a series parallel connection manner, wherein the burning furnace, the first stage Claus reactor and the second stage Claus reactor are sequentially connected in series. According to the present invention, with the appropriate selection of each catalyst, the appropriate selection of the desulfurization agent, and the accurate control of each step process condition, the total standard sulfur in the process emission gas is that SO2 is less than or equal to 10 mg/m<3>; and the low sulfur emission sulphur recovery process has advantages of low sulfur emission, long desulfurization agent service life, high desulfurization capacity, less replacement frequency, low cost and the like.

The invention discloses a blast furnace gas desulfurization catalyst as well as a preparation method and application thereof. The desulfurization catalyst is composed of an activated carbon carrier, an active component and a cocatalyst; the active component is one or a combination of zinc oxide, iron oxide, manganese oxide and copper oxide; and the cocatalyst is an alkali metal or alkaline earth metal oxide. The preparation method comprises the following steps of: (1) carrying out functional group and surface acid-base modification treatment on the activated carbon carrier; (2) preparing an active component solution, loading an active component on the modified activated carbon carrier by adopting an impregnation method, and performing drying and roasting; and (3) preparing a cocatalyst component solution, loading a cocatalyst component on the modified activated carbon carrier by adopting an impregnation method, performing drying and roasting to obtain the desulfurization catalyst. Thecatalyst is used for removing sulfides in blast furnace gas; the concentration of the sulfides is reduced to 20 mg/Nm <3> or below, the saturated sulfur capacity is larger than 20%; high activity is still achieved after multiple times of regeneration, and the gas desulfurization cost can be greatly reduced.

The invention provides a normal temperature ferric oxide desulfurizer which consists of ferric oxide, binding agent, hole making agent and chips. The invention also provides the preparation method of the desulfurizer and method of removing hydrogen sulphide in the raw gas by using the desulfurizer. The normal temperature ferric oxide desulfurizer provided by the invention is applicable to the rough, fine desulfurization in the production processes of synthetic ammonia, methanol, combined methanol, low-carbon alcohol, synthetic fuel methanation and so on, and is also applicable to the removal of hydrogen sulphide by using various gas sources like semi-water gas, water gas, town gas, coke oven gas, natural gas, liquefied gas, chemical raw gas, marsh gas, carbon dioxide and so on, and using various reactors like fixed bed, moving bed and so on.

The invention provides a recovery system of low-order coal pyrolysis oil gas. The recovery system comprises a cyclone dust collector, a filter dust collector, washing equipment, an electrical tar precipitator, adsorption equipment and a desulfurizing tower, wherein the washing equipment comprises an ammonia water storage tank, a tar washing tank and a gas-liquid contact vertical pipe which is positioned above the tar washing tank; the adsorption equipment is internally filled with one or more of pyrolytic semi-cokes, cokes, sawdust, granular activated carbon, activated carbon fiber, silica gel, activated aluminum oxide and molecular sieve. According to the recovery system provided by the invention, a dynamic wave washer is adopted, the structure is simple, the manufacturing cost is low, the energy consumption is low, the operation flexibility is large, and the gas-liquid mass transfer effect is good; due to the additional arrangement of a soft connecting pipe wall and a vibrator/an oscillator, the situation that a pipeline is blocked as tar is condensed on the pipe wall can be effectively avoided; through an oil gas product recovery technology adopted by the invention, and by arranging a hydrogen sulfide adsorption device and a dewatering device, hydrogen sulfide and water vapor in pyrolysis gas can be adsorbed, and the problems that due to the condensation of tar mist, VOCs (Volatile Organic Compouns) and the water vapor in the pyrolysis gas, pipeline equipment is corroded, and long-distance transportation requirements are difficult to meet are effectively solved.

The invention relates to a method for preparing a normal temperature oil desulfurizer. The preparation method comprises the steps of preparing a zinc oxide mixture, preparing a ferric nitrate solution, preparing mixed liquid of silver and copper, squeezing, drying and baking. The normal temperature oil desulfurizer prepared from the method provided by the invention can not only remove hydrogen sulfide and a part of mercaptan sulfur in oils, but also has a good removal effect on elemental sulfur that is difficult to remove, the range of applicable oil raw materials is wide, and the oil corrosion problem caused by a variety of sulfides can be solved.

The invention provides a preparation method for carbon-supported monolayer molybdenum disulfide composite catalyst for low-temperature hydro-conversion of carbonyl sulfide, which belongs to the technical field of functional catalytic material preparation and environment-friendly catalytic application. Ammonium tetrathiomolybdate is uniformly dispersed on a surfactant-modified appropriate carbon source, and hydrazine hydrate liquid-phase reduction and high-temperature treatment are then performed, so that the carbon-supported monolayer molybdenum disulfide composite material is obtained. In the material, monolayer molybdenum disulfide uniformly grows on the surface of carbon support, the material shows property rich in defective and active sites, and shows excellent activity in catalytic conversion of carbonyl sulfide by hydrogenation, and the catalytic performance is stable. The preparation method is easy to operate, the cost is low, the temperature of catalysis is low, the accuracy of catalysis is high, the stability is good, and the invention has good economic benefit and industrial application prospect.

The invention belongs to the technical field of desulfurization and particularly relates to a high airspeed iron desulfurizing agent, a preparation method and application of the desulfurizing agent. The desulfurizing agent provided by the invention takes activated zinc oxide with nanoparticle small size effect as an additive; the additive is fully utilized; when hydrogen sulfide molecules escape under the condition that a hydroxyl ferric oxide component is combined with hydrogen sulfide till reaching a saturated state, the activated zinc oxide can react with the escaping hydrogen sulfide; a compound active center is formed under the interaction of the hydroxyl ferric oxide and the activated zinc oxide, and the desulfurizing precision is effectively improved; meanwhile, the compound active center also can effectively accelerate the combining of the desulfurizing agent and the hydrogen sulfide molecules and the unit handling capacity of the desulfurizing agent can be increased. The desulfurizing agent provided by the invention can meet the high airspeed desulfurizing requirement; the desulfurizing precision is high; the hydrogen sulfide content in the desulfurized gas is smaller than 0.1ppm; the penetrating sulfur capacity under the airspeed of 6000h-1 under room temperature can reach up to 33%.

The invention discloses a composite metal oxide desulphurization agent and a preparation method thereof, which belongs to the technical field of environmental protection and chemical industry. The desulphurization agent is prepared by precipitating an active component and a carrier by virtue of a precipitating agent in a kneading method, wherein the active component is classified into a main active component and a third active component, the main active component is Cu<2+>, the third active component is Mn<2+>, Zn<2+>, Ca<2+>, Fe<3+>, the carrier is Al<3+>, and the precipitating agent is organic amine. By mixing the multi-component metal, the utilization rate is maximized, the active components are sufficiently dispersed in pores of the carrier with a given specific surface area and a porous structure by adopting a co-precipitation method, so that the active components can be sufficiently mixed with sulfide, the utilization rate is greatly improved, and the desulphurization precision can be improved by utilizing the doping of different metal oxides.

The invention relates to a ZnO-MnO2/gama-Al2O3 middle and low temperature coal gas fine desulfurizing agent and a preparation method thereof. The ZnO-MnO2/gama-Al2O3 middle and low temperature coal gas fine desulfurizing agent comprises the following active elements in percentage by mass: 15-20% of active element MnO2 and ZnO, and 80-85% of gamma-Al2O3; and the mole ratio of the MnO2 to the ZnO is 1:(7.5-8.5). The masses of precursor Zn(NO3)2*6H2O and Mn(NO3)2 required to prepare a solution are calculated by the mass percent and the mole ratio of the active elements, and the volume of the solution is approximately equal to the volume of the carrier gamma-Al2O3. The preparation method of the ZnO-MnO2/gama-Al2O3 middle and low temperature coal gas fine desulfurizing agent comprises the following steps of: adding the carrier gamma-Al2O3 to the solution for dipping at room temperature for 12h, putting a mixture to a 110 DEG C drying oven for drying, stirring once at each 3min during drying, transferring a sample to a Muffle furnace for roasting at 400-500 DEG C for 3h after water is totally evaporated so as to obtain the ZnO-MnO2/gamma-Al2O3 load-type desulfurizing agent. The desulfurizing agent prepared by the method disclosed by the invention is 150-170m<2>/g in specific surface area, 0.50-0.55cm<3>/g in pore volume and 10-14nm in average aperture, and has the characteristics of high middle and low temperature desulfurization precision and sulfur breakthrough volume, simple preparation process and the like.