41results about How to "High desulfurization depth" patented technology

The invention provides a gasoline desulfurization method. The gasoline desulfurization comprises the following steps: cutting a gasoline raw material into a light gasoline fraction and a heavy gasoline fraction; performing adsorption desulfurization on the light gasoline fraction to obtain desulfurized light gasoline fraction; and performing selective hydrogenation desulfurization on the heavy gasoline fraction to obtain desulfurized heavy gasoline fraction, wherein the cutting temperature of the light gasoline fraction and the heavy gasoline fraction is 70-110 DEG C. By adopting the gasoline desulfurization method, not only can deep desulfurization of gasoline be realized, but also the octane loss is low.

The invention relates to a combination method for deep desulfurization of liquefied gas. The method comprises the steps that liquefied gas is fed into an extraction tower to contact with an alkali liquor counter flow, desulfurized liquefied gas and regenerated alkali liquor are fed into a static mixer to be mixed and then the obtained mixture is subjected to secondary extraction, mixed liquid is separated in a liquefied gas-alkali liquor separation tank, liquid gas is fed to be subjected to water washing, alkali liquor to be generated flowing out of the bottom of the extraction tower enters a flash tank, residual liquefied gas discharged from the top of the tank is conveyed to a gas system, alkali liquor to be generated obtained at the bottom of the tank, after being heated, enters a high gravity reactor to react with non-purified air, tail gas discharged from the high gravity reactor, after being subjected to alkali liquor removal by a coalescer, is fed back to the flash tank, the tail gas subjected to alkali liquor removal is fed into a diesel oil absorption tower to contact with a diesel oil counter flow, purified tail gas discharged from the top of the tower returns to the high gravity reactor to be recycled, rich diesel oil discharged from the bottom of the tower is conveyed to a diesel oil hydrogenation device, and the obtained regenerated alkali liquor is recycled. According to the method, the desulphurization depth is large, the regenerated alkali liquor quality is high, the equipment is simple and reliable, the cost is low, the emission amount of 'three wastes' is few, and the whole process conforms to the requirements of environmental protection.

The invention provides a hydrogenation method for deeply desulfurizing gasoline. The hydrogenation method comprises the steps that catalytically cracked gasoline is fractionated into light fractions and heavy fractions; the heavy fractions and hydrogen are mixed and enter into a first hydrogenation reaction zone to react to obtain low-sulfur heavy fraction oil, and the recycle hydrogen obtained through separation is recycled after desulfurization; the light fractions and hydrogen are mixed and enter into a second hydrogenation reaction zone, diene is subjected to hydrogenation saturation to obtain mono-olefin low-boiling sulfides and the mono-olefin low-boiling sulfides are converted to high-boiling sulfides; the hydrogenated light fraction oil enters a light-medium fraction fractionating tower and is divided into light fractions and medium fractions and low-sulfur light fraction oil is obtained; the medium and light fractions and hydrogen are mixed and enter into a third hydrogenation reaction zone to react to obtain low-sulfur medium fraction oil, and the recycle hydrogen obtained through separation is recycled after desulfurization; and the heavy fraction oil, the light fraction oil and the medium fraction oil are mixed to obtain the low-sulfur gasoline product. Aiming to produce the gasoline with sulfur content not more than 10mu g/g, the method provided by the invention has the characteristics of high desulfurization depth, long device running period and the like.

The invention provides a supported hydroxide high-selectivity gasoline adsorption deep desulfurizing agent and a preparation method thereof. The supported hydroxide high-selectivity gasoline adsorption deep desulfurizing agent is prepared from a carrier and metal hydroxide supported on the carrier; the mass ratio of the metal hydroxide to the carrier is (5 to 30) to 100. The invention further provides the preparation method of the supported hydroxide high-selectivity gasoline adsorption deep desulfurizing agent. The supported hydroxide high-selectivity gasoline adsorption deep desulfurizing agent provided by the invention has the advantages of relatively high desulfurizing depth, high selectivity, no octane value loss and flexibility, simplicity and convenience for operation.

The invention relates to a deep desulfurization technology for liquefied petroleum gas. A carbonyl sulfate water-washing tower is adopted to remove hydrogen sulfate and carbonyl sulfate in the liquefied petroleum gas respectively according to different nature characteristics of sulfides contained in the liquefied petroleum gas, small-molecular mercaptan in the liquefied petroleum gas is converted into disulfides with higher boiling points through an oxidation tower, then the sulfides and a liquefied petroleum gas product are separated with a rectification method, sulfur-enriched C5 or heavy C4 components are arranged at the tower bottom, and the ultra-low-sulfur liquefied petroleum gas product is arranged at the tower top. The content of sulfur in the liquefied petroleum gas is decreased to be lower than 5 mu g/g in the process, the desulfurization rate is high, and no alkali residue is discharged.

The invention discloses a desulfuration adsorbent. The desulfuration adsorbent is composed of the following raw materials of, by weight, 33-41 parts of nano attapulgite, 1-5 parts of cyclohexyl methyl ketone, 7-15 parts of acrylic acid, and 11-19 parts of ammonium metavanadate. According to the desulfuration adsorbent, the nano attapulgite serves as one of the raw materials and mixed with the cyclohexyl methyl ketone, grinding is conducted, and the ammonium metavanadate, the acrylic acid and the like are used for treatment, so that the desulfuration adsorbent is prepared; the desulfuration adsorbent prepared in the this way is large in sulfur capacity, good in sulfur selectivity, high in desulfuration percent and capable of reducing sulfur to 1ppmw; and in addition, the desulfuration adsorbent is long in service life, environmentally friendly and free of secondary pollution. The preparation process of the desulfuration adsorbent is simple, operation and control are easy, the performance is stable, the production cost is low, and the desulfuration adsorbent is suitable for industrialized production. When the desulfuration adsorbent is used for desulfuration of gasoline, the process operating conditions are mild, dsulfuration can be conducted under ordinary pressure and at a low temperature, accordingly energy consumption is reduced, and the operation cost is lowered.

The invention discloses a catalytic hydrogenation method for inferior wax oil. The method comprises the steps: (1) introducing the inferior wax oil to a first reaction zone for first hydrofining in the presence of hydrogen gas; (2) introducing effluent of the first reaction zone to a flash vaporization section for flash vaporization, so as to obtain a gas-phase component and a liquid-phase component; (3) introducing the liquid-phase component to a second reaction zone, and subjecting the liquid-phase component to countercurrent contact with hydrogen gas introduced from the bottom of the second reaction zone, so as to carry out second hydrofining; and (4) mixing effluent of the second reaction zone with the gas-phase component obtained in the step (2), and then, introducing the mixture into a gas-liquid separation system and a fractionating system sequentially. According to the method disclosed by the invention, the sulfur content and nitrogen content of high-sulfur and high-nitrogen inferior raw materials can be remarkably lowered, and the operating cycle of a catalytic hydrogenation device can be prolonged.

The invention relates to a method for manufacturing full-tire rubber powder high-tenacity reclaimed rubber by oligomer ester. The method includes the steps: matching the oligomer ester into a regeneration activator system; uniformly stirring and mixing the oligomer ester and full-tire rubber powder in a high-temperature mixing tank to obtain mixed rubber powder; recovering the mixed rubber powderby the aid of waste rubber desulphurization devices (dynamic desulphurization tank device, screw extrusion device and spiral extrusion device) to form disulfide powder; refining and packaging the disulfide powder to form high-performance reclaimed rubber products. The method solves the problem of high consumption of domestic high-tenacity reclaimed rubber.

The invention provides a novel composite fuel oil desulfurization adsorbent, a preparation method and application thereof. The novel composite fuel oil desulfurization adsorbent comprises the following components by weight: 10-20 parts of molecular sieve raw powder, 10-20 parts of Al2O3, 40-60 parts of water glass, 5-15 parts of a metal salt and 1-6 parts of an organic ligand. According to the invention, integral molecular sieve particles are adopted as the carrier, on which a metal organic skeleton with high desulfurization activity is loaded, and finally an integral hierarchical pore molecular sieve@metal organic skeleton composite desulfurization adsorbent can be obtained, and the problems of low desulfurization precision, low sulfur capacity and the like in the prior art are solved. The desulfurization adsorbent provided by the invention has high removal efficiency on thiophene sulfides, has high selectivity on sulfides, is environment-friendly and has no secondary pollution. The operation can be performed under normal temperature and normal pressure, and the operation cost is saved.

The invention relates to a gasoline fraction desulfurization method, a method for producing low-sulfur gasoline and a reaction system. According to the method, a gasoline fraction enters a first reactor, and contacts a first hydrodesulfurization catalyst in the presence of hydrogen to carry out a first hydrodesulfurization reaction; a product obtained after the reaction enters a steam stripping tower, hydrogen-rich gas containing hydrogen sulfide and an intermediate gasoline fraction are obtained at the top of the steam stripping tower, a descending tower bottom material enters a second reactor and contacts a second desulfurization catalyst to be subjected to a secondary desulfurization reaction, a reaction product returns to the bottom of the steam stripping tower, a liquid phase in the reaction product is extracted to serve as a desulfurized heavy gasoline fraction, and a vapor phase returns to the steam stripping section of the steam stripping tower; and the second reactor is a heat exchange type reactor, and an external heat source flows through a coil pipe or a tube nest in the heat exchange type reactor to heat reaction materials. The gasoline fraction desulfurization method provided by the invention can reduce energy consumption, and is small in octane number loss and high in desulfurization depth.

The invention provides a refinery rich gas pretreatment method and a dry gas and/or liquefied petroleum gas desulfurization method. The refinery rich gas pretreatment method comprises the step of contacting the refinery rich gas with a purifying agent. The refinery rich gas pretreatment method can reduce the desulfurization load of downstream products including dry gas and liquefied gas of the refinery rich gas, reduce the environmental protection pressure of desulfurization of the dry gas and the liquefied gas and improve the desulfurization depth of the dry gas and the liquefied gas, and particularly can break through the limit of the prior art of desulfurization of the liquefied gas. The dry gas and/or liquefied gas desulfurization method can be used to carry out deep desulfurization onthe dry gas and/or liquefied gas in order to obtain dry gas and/or liquefied gas with an extremely low sulfur content.

The invention discloses a gasoline desulfurization adsorbent, and a preparation method and an application thereof. The desulfurization adsorbent is composed of the following raw materials in parts by weight: 27 to 35 parts of nanometer attapulgite, 3 to 7 parts of strontium acetate, 13 to 21 parts of acrylic acid and 5 to 13 parts of triethanolamine. The desulfurization adsorbent provided by the invention is prepared through the following steps: with the nanometer attapulgite as a raw material, carrying out mixing with strontium acetate, carrying out grinding, carrying out treatment with acrylic acid and triethanolamine, etc. The desulfurization adsorbent has large sulfur capacity, good selectivity to sulfur and high desulfurization depth, can remove sulfur to 1 ppmw, has long service life and is friendly to the environment. The preparation process provided by the invention has the advantages of simplicity, easy operation, easy control, stable performances, low production cost and applicability to industrial production. By adopting the desulfurization absorbent provided by the invention for desulfurization of gasoline, the process has mild operation conditions, and can be performed at normal pressure and low temperature, so energy consumption is saved, and the cost of operation is reduced.