2203 results about "Hydrodesulfurization" patented technology

The invention provides a composite molecular sieve and a hydrodesulfurization catalyst prepared with the composite molecular sieve as a carrier. According to the composite molecular sieve and the hydrodesulfurization catalyst, the Beta-FDU-12 composite molecular sieve is of a bimodal porous structure, namely a Beta micropore and an FDU-12 mesoporous, the superficial area of the composite molecular sieve is 800-1000m<2>.g<-1>, the pore diameter is 14-25 nm, and the pore volume is 0.4-0.9 cm<3>.g<-1>.The hydrodesulfurization catalyst prepared with the Beta-FDU-12 composite molecular sieve as the carrier is outstanding in performance, the yield of FCC diesel oil can be higher than 99%, the denitrification percent can be higher than 98%, and the sulphur content is lower than 10 ppm.

A two stage hydrodesulfurizing process for producing low sulfur distillates. A distillate boiling range feedstock containing in excess of about 3,000 wppm sulfur is hydrodesulfurized in a first hydrodesulfurizing stage containing one or more reaction zones in the presence of hydrogen and a hydrodesulfurizing catalyst. The liquid product stream thereof is passed to a first separation stage wherein a vapor phase product stream and a liquid product stream are produced. The liquid product stream, which has a substantially lower sulfur and nitrogen content then the original feedstream is passed to a second hydrodesulfurizing stage also containing one or more reaction zones where it is reacted in the presence of hydrogen and a second hydrodesulfurizing catalyst at hydrodesulfurizing conditions. The catalyst in any one or more reaction zones is a bulk multimetallic catalyst comprised of at least one Group VIII non-noble metal and at least two Group VIB metals.

The method for producing low-sulfur gasoline includes the following steps: cutting gasoline raw material into light fraction and heavy fraction, making the light fraction undergo the processes of alkali refinement treatment and removing mercaptans, making the heavy fraction and hydrogen gas together by contacted with hydrogenation desulfurization catalyst to make selective hydrogenation desulfurization reaction, then hydrogenated gasoline fraction undergo the process of hydrogenation or non-hydrogenation to remove mercaptans, then mixing the above-mentioned desulfurized light and heavy fractions so as to obtain the invented gasoline product whose olefine saturation rate is less than 30%, and sulfur content is less than 200 ppm.

The present invention relates to a selective hydro-desulfurization catalyst of gasoline and process for using said catalyst. Said invented catayst uses alumina as carrier, uses molybdenum and cobalt as active component, at the same time contains adjuvant potassium and phosphorus, and the optimized atomic ratio of phosphorus and potassium is 1-2. Said invented catalyst has good selectivity and stability, and at the same time has proper activity, and is mainly used for selective hydro-desulfurization of catalytic cracked gasoline.

Processes are disclosed for removing sulfur, including cyclic and polycyclic organic sulfur components such as thiophenes and benzothiophenes, from a hydrocarbon feedstock including fuels and fuel components. The feedstock is contacted with a regenerable sorbent material capable of selectively adsorbing the sulfur compounds present in the hydrocarbon feedstock in the absence of a hydrodesulfurization catalyst. In one embodiment, the sorbent can be an active metal oxide sulfur sorbent in combination with a refractory inorganic oxide cracking catalyst support. In another embodiment, the sorbent can be a metal-substituted refractory inorganic oxide cracking catalyst wherein the metal is a metal which is capable in its oxide form, of adsorption of reduced sulfur compounds by conversion of the metal oxide to a metal sulfide. The processes are preferably carried out in a transport bed reactor.

The invention belongs to the technical field of molecular sieve preparation, and particularly relates to an in-situ preparation method for a microporous-mesoporous molecular sieve containing noble metal. The in-situ preparation method comprises the steps as follows: adding a coupling pore-forming agent, a silicon source, an aluminum source or a titanium source, and an alkali source into a water solution of noble metal nano particles in sequence under the water bath condition; and ageing, drying, crystallizing, drying and carrying out high-temperature calcination to obtain the microporous-mesoporous molecular sieve containing the noble metal. The prepared microporous-mesoporous molecular sieve is provided with a hierarchical pore structure; the noble metal nano particles with high dispersity are covered in situ while a mesoporous structure is generated; and a synthetic method is convenient and simple, saves energy and reduces emission. A multifunctional catalyst prepared with the method integrates the advantages of the microporous channels of the molecular sieve, the transgranular meso pores and the intergranular meso pores of the molecular sieve and the noble metal nano particles, and is more suitable for catalytic reactions of sulfur-containing large molecules such as hydrogen desulfurization and the like.

A high temperature naphtha desulfurization process with reduced olefin saturation employs a partially spent and low metals content hydrodesulfurization catalyst having from 2-40% the activity of a new catalyst. The catalytic metals preferably include Co and Mo in an atomic ratio of from 0.1 to 1. The catalyst is preferably at least partially regenerable, has less than 500 wppm of a total of one or more of nickel, iron and vanadium and preferably has no more than 12 wt. % catalytic metal calculated as the oxide. This permits selective deep desulfurization, with reduced olefin saturation, low product mercaptan levels and little or need for downstream mercaptan removal.

A continuous process for upgrading sour crude oil by treating the sour crude oil in a two step process that includes a hydro-demetallization section and a hydro-desulfurization section, both of which are constructed in a permutable fashion so as to optimize the operating conditions and catalyst lifespan to produce a high value crude oil having low sulfur and low organometallic impurities.

The invention relates to a gasoline hydrodesulfurization method, which comprises the following steps that: gasoline raw materials are fractionated into light fraction gasoline and heavy fraction gasoline, wherein the light fraction gasoline is removed mercaptan sulfer through caustic washing refining, the heavy fraction gasoline carries out a hydrogenation diene-removal reaction, a selective hydrodesulfurization reaction and a selective hydrogenation mercaptan sulfer-removal reaction respectively through two hydrogenation reactors, and the obtained hydrogenation heavy fraction gasoline and the refined light fraction gasoline are mixed to obtain full fraction gasoline with ultra-low sulfur. According to the method provided by the invention, under the condition that the desulfurization degree reaches a target, the full fraction gasoline product have small mercaptan sulfur content, less olefin saturation and small octane value loss. The mercaptan sulfur content of the obtained dull fraction gasoline product is less than 10Mug/g, the total sulfur content is reduced under 50Mug/g, and the octane value RON loss is less than 1.0 unit, particularly, the total sulfur content of the full fraction gasoline product is reduced under 10 Mug/g, and the octane value RON loss is less than 1.5 units.

The invention relates to an efficient coupling hydro-upgrading method for producing gasoline with ultra-low sulfur and a high octane number. The method comprises the following steps of: distilling inferior full cut gasoline at 50-90 DEG C to obtain light cut gasoline and heavy cut gasoline; making the light cut gasoline contact with a hydrocarbon multi-branched isomerization catalyst; making the heavy cut gasoline contact with a selective hydrogenation desulfurization catalyst and a complement desulfurization isomerization/aromatization catalyst sequentially; and finally, mixing the treated light cut gasoline with the treated heavy cut gasoline to obtain the gasoline with the ultra-low sulfur and the high octane number. The method further comprises the step of: before the distillation, making the inferior full cut gasoline contact with a hydro-selective desulfurization alcohol catalyst, or, before making the light cut gasoline contact with a hydrocarbon multi-branched isomerization catalyst, making the light cut gasoline contact with the hydro-selective desulfurization alcohol catalyst. The efficient coupling hydro-upgrading method is suitable for the hydro-upgrading treatment of inferior gasoline with ultrahigh sulfur and high olefin, reduces the sulfur content after the upgrading treatment to below 5mu g/g (no sulfur substantially) and can maintain the octane number and higher yield of products.

A process for the selective hydrodesulfurization of olefinic naphtha streams containing a substantial amount of organically bound sulfur and olefins. The olefinic naphtha stream is selectively desulfurized in a first hydrodesulfurization reaction stage. This effluent stream is then contacted with a stripping agent in a H₂S removal zone, such as steam or an amine solution, to remove H₂S from the effluent stream, thereby reducing the H₂S partial pressure of the process stream. The process stream is then subjected to a second desulfurization reaction stage followed by a mercaptan decomposition stage to reduce the content of mercaptan sulfur in the final product stream. In a second embodiment, the effluent stream from the first hydrodesulfurization reaction stage, after being subjected to the H₂S removal zone, is fed directly to the mercaptan decomposition stage where total sulfur content and mercaptan sulfur content are reduced in the final product stream.

The invention relates to a production method for ultra-low sulfur and high-octane number gasoline. The method comprises the following steps of: filling a poor-quality full range gasoline raw material in a reaction distillation column to contact the material with a sulfoether catalyst to perform a sulfur ether reaction and fraction cutting so that low-boiling point sulfides, such as thiol and thiophene, are converted into high-boiling point sulfoether which is then transferred into heavy fraction gasoline, wherein the cutting fractionation temperature of light fraction gasoline and the heavy fraction gasoline is 50 to 90 DEG C; contacting the light fraction gasoline with a hydrocarbon highly branched isomerization catalyst; contacting the heavy fraction gasoline with a selective hydrodesulfurization catalyst and a desulfurization-hydrocarbon isomerization/aromatization catalyst; and mixing the treated light fraction gasoline and the heavy fraction gasoline to obtain the ultra-low sulfur and high-octane number gasoline. The method is suitable for modifying poor-quality gasoline, can reach better desulfurization and olefin reduction effects on ultra-high sulfur and high-olefin poor-quality catalytic gasoline, and can maintain or increase the octane number of the product and keep a higher product yield after reaction.

A process for the desulfurization of hydrocarbonaceous oil wherein the hydrocarbonaceous oil is contacted with a hydrodesulfurization catalyst in a hydrodesulfurization reaction zone to reduce the sulfur level to a relatively low level then contacting the resulting hydrocarbonaceous stream from the hydrodesulfurization zone with an oxidizing agent to convert the residual, low level of sulfur compounds into sulfur-oxidated compounds. The resulting hydrocarbonaceous oil stream containing the sulfur-oxidated compounds is separated after decomposing any residual oxidizing agent by contacting the stream with an adsorbent material to adsorb the sulfur-oxidated compounds to produce a hydrocarbonaceous oil stream having a reduced concentration of sulfur-oxidated compounds. The spent adsorbent is regenerated and subsequently returned to adsorbent service.

A unique mixed metal molybdotungstate material has been developed. The material may be used as a hydroprocessing catalyst. The hydroprocessing may include hydrodenitrification, hydrodesulfurization, hydrodemetallation, hydrodearomatization, hydrodesilication, hydroisomerization, hydrotreating, hydrofining, and hydrocracking.

The present invention is one kind of catalyst with ZSM-5/SAPO-11 composite zeolite for hydrogenating and modifying catalytically cracked gasoline and its preparation process. The composite zeolite is prepared through compounding solution A with aluminum sulfate, sulfuric acid and water; compounding solution B with water glass, tetraethyl ammonium hydroxide and water; mixing solution A and solution B to form homogeneous colloid; crystallizing the colloid mixture at 150-180 deg.c for 24-72 hr; adding phosphoric acid, pseudoboehite, silica sol and SAPO-11 synthesizing template agent; and final crystallizing at 170-200 deg.c for 24-48 hr to obtain sodium type composite zeolite. The catalyst with the composite zeolite as carrier has excellent hydrogenating and desulfurizing performance, high stability, high gasoline yield, high isomerization activity and certain aromatization activity, and may be applied in producing high quality clean gasoline product.

The invention discloses a heavy oil hydrotreating catalyst and a preparation method thereof. The method for preparing the catalyst adopts a complete mixed kneading method; a carrier material comprises pseudo-boehmite glue powder and alumina powder; and an active metallic solution contains nonionic surfactant. The catalyst prepared by the method has the characteristics of large pore volume and pore diameter, proper specific surface area, even active metal dispersion and the like, and can be used in the processes of heavy oil hydrodemetalization, hydrodesulfurization and the like.

The invention provides a hydrogenation method for residual oil. The method includes the following steps: under the condition of hydrogenation reaction, residual oil raw materials and hydrogen gas are sequentially guided into two hydrogenation reaction zones connected in series to carry out contact reaction with a plurality of catalyst beds in the hydrogenation reaction zones; according to the flowing directions of a reactant and the hydrogen gas, the first and second hydrogenation reaction zones respectively comprise a hydrogenation protecting catalyst, a hydrogenation de-metallization catalyst and a hydrogenation desulfurization catalyst which are sequentially filled in the catalyst beds; when the pressure drop of at least one catalyst bed in the first hydrogenation reaction zone reaches the upper limit or hot spots appear in the reaction zone, at least one part of the residual oil raw materials and the hydrogen gas is directly guided into the second hydrogenation reaction zone. Compared with the prior art, the method in the invention can prolong the running period of a residual oil hydrogenation device, thereby increasing the running efficiency of the device and improving the economical property of the device as well.

The invention relates to a grading composition of a hydrogenation catalyst. From top to bottom, a reactor is filled with hydrodemetallization and a hydrodesulfurization catalyst; raw materials flow from top to bottom, and along with the flowing direction of raw materials, the activity of the catalyst gradually increases, the pore size gradually decreases, the grain size gradually decreases and the porosity gradually decreases; the hydrodemetallization catalyst and the hydrodesulfurization catalyst are both formed by one or more demetallization catalysts; concentrations of active metal components and acid auxiliary agents are in nonuniform distribution, and from the surface to the center of catalyst grains, the concentrations of the active metal components and acid auxiliary agents of the hydrodemetallization catalyst are of gradient increase, and the concentrations of the active metal components and acid auxiliary agents of the hydrodesulfurization catalyst are of gradient decrease; and based on weight content, the demetallization catalyst accounts for 15 to 80 percent, and the desulfurization catalyst accounts for 20 to 85 percent. The grading composition of the invention is applied to hydrogenation catalysis of oil and residual oil of heavy ends and has the advantages of possessing better activity and stability of demetallization, residual carbon removal and desulfurization, controlling temperature rise of a catalyst bed and degreasing the deactivation speed of the catalyst.

This invention relates to a crude oil desulfurization process which comprises hydrodesulfurizing a crude oil feed in a crude desulfurization unit. The desulfurized crude oil is then separated into a light gas oil fraction, a vacuum gas oil fraction and a vacuum residuum fraction. The vacuum gas oil is hydrocracked to form at least one low sulfur fuel product. The light gas oil fraction is hydrotreated. The vacuum gas oil may be hydrocracked in one or more stages. Hydrocracking in the second stage, if present, will convert of at least 20% of the first zone effluent, to create a low sulfur light gas oil fraction. The light gas oil fraction may then be hydrotreated.

The present invention provides a hydrodesulfurization that can attain an extremely high depth of desulfurization to a sulfur content of 10 ppm by mass and maintain such a high desulfurization activity for a long period of time. The catalyst comprises an inorganic porous support containing alumina and phosphorus, at least one active metal selected from the metals of Group 8 of the periodic table, and at least one metal selected from the metals of Group 6A of the periodic table, the Group 8 metal and the Group 6A metal being contained in a molar ratio defined by (oxide of the Group 8 metal)/(oxide of the Group 6A metal) ranging from 0.055 to 0.150, and the content of the Group 6A metal in terms of oxide being in the range of 30 to 40 percent by mass based on the mass of the catalyst.

A process of crackling and aromatizing gasoline, and desulfurizing. It comprises: all fractions of crackling gasoline by catalysizing or light fractions entering an aromatizing desulfurizing reactor,and aromatizing olefin, hydrogenating and desulfurizing with hydrogen produced by aromatizing are hydrogenated, reducing the contents of olefin and sulfur in gasoline, deodorizing the products, then obtaining high-grade gasoline product.

The present invention discloses one kind of fraction oil hydrodesulfurizing catalyst and its preparation process. The catalyst has alumina or silicon-containing alumina as carrier, W, Mo, Ni and Co as active components, and phosphorus assistant. It is prepared through saturation co-soaking process, and has active metal components possessing synergistic effect high dispersed, and high activity, especially high hydrodesulfurizing activity. It is used in the hydrodesulfurizing process, especially deep hydrodesulfurizing process, of various kinds of fraction oil.

A gasoline selective hydrodesulfurization method comprises the following steps: mixing full-range gasoline and/or heave gasoline distillate with hydrogen, carrying out selective hydrodesulfurization reaction in the presence of hydrodesulfurization catalyst I and hydrodesulfurization catalyst II, and cooling and separating the resultants to obtain hydrogenated gasoline distillate, wherein the heavy gasoline distillate is obtained by cutting full-range gasoline at a cutting temperature of 50 to 75 DEG C, and the hydrodesulfurization catalyst I and hydrodesulfurization catalyst II are VIB-group metal and/or VIII-group non-noble metal catalysts loaded on aluminum and/or silica-alumina carrier. The method can be used for processing catalytic cracking gasoline to obtain gasoline product with sulfur content meeting EuroIV emission standard or even meeting EuroV emission standard, and the gasoline product has less octane number loss and RON loss less than 2.0.