4773 results about "Sulfur content" patented technology

Particulate sorbent compositions comprising a mixture of zinc oxide, silica, alumina and a substantially reduced valence nickel are provided for the desulfurization of a feedstream of cracked-gasoline or diesel fuels in a desulfurization zone by a process which comprises the contacting of such feedstreams in a desulfurization zone followed by separation of the resulting low sulfur-containing stream and sulfurized-sorbent and thereafter regenerating and activating the separated sorbent before recycle of same to the desulfurization zone.

Contact of a crude feed with one or more catalysts produces a total product that includes a crude product. The crude feed may include Micro-Carbon Residue (MCR), oxygen, sulfur, or mixtures thereof. The crude product is a liquid mixture at 25° C. and 0.101 MPa. The crude product may have a MCR residue and/or oxygen content of at most 90% of the MCR residue content and/or oxygen content of the crude feed. In some instances, the crude product may have a sulfur content of about 30% to about 70% of the sulfur content of the crude feed. One or more other properties of the crude product may be changed by at least 10% relative to the respective properties of the crude feed.

A method is provided for manufacturing cleaner fuels, in which NPC (Natural Polar Compounds), naturally existing in small quantities within various petrolic hydrocarbon fractions, are removed from the petrolic hydrocarbon fractions ranging, in boiling point, from 110 to 560° C. and preferably from 200 to 400° C., in advance of catalytic hydroprocessing. The removal of NPC improves the efficiency of the catalytic process and produces environment-friendly products, such as diesel fuel with a sulfur content of 50 ppm (wt) or lower. Also, the NPC can be used to improve fuel lubricity.

The invention relates to a hydrotreating method (HDT) using two plants working under different operating conditions with an intermediate stripping for co-treating a mixture made up of oils of vegetable or animal origin and petroleum cuts (gas oil cuts (GO) and middle distillates) in order to produce gas oil fuel bases meeting specifications. The first plant (HDT1) is more particularly dedicated to the reactions concerning oils of vegetable or animal origin in comixture while pretreating the hydrocarbon feed, whereas the second plant (HDS2) works under more severe conditions to obtain diesel fuel according to standards, in particular in terms of effluent sulfur content, density and cold properties. The process economy, the activity and the stability of the catalyst of the second plant are greatly improved by the intermediate stripping.

Methods of producing a total product are described. A method includes continuously contacting a feed with a hydrogen source in the presence of one or more inorganic salt catalysts and steam to produce a total product, wherein the feed has at least 0.02 grams of sulfur, per gram of feed; and producing a total product that includes coke and the crude product. The crude product has a sulfur content of at most 90% of the sulfur content of the feed.

Biofuels can be produced by: (i) providing a biomass containing celluloses, hemicelluloses, lignin, nitrogen compounds and sulfur compounds; (ii) removing sulfur compounds and nitrogen compounds from the biomass by contacting the biomass with a digestive solvent to form a pretreated biomass containing carbohydrates and having less than 35% of the sulfur content and less than 35% of the nitrogen content of untreated biomass on a dry mass basis; (iii) contacting the pretreated biomass directly with hydrogen in the presence of a hydrogenolysis catalyst to form a plurality of oxygenated intermediates, and (vi) processing at least a portion of the oxygenated intermediates to form a liquid fuel.

A hydrotreating method uses two catalyst beds with the introduction, on the last catalyst bed, of oils of animal or vegetable origin for co-treating a mixture made up of oils of vegetable or animal origin and of petroleum cuts (gas oil cuts (GO) and middle distillates) in order to produce gas oil effluents meeting specifications with an improved cetane number. The first catalyst bed is dedicated to only the deep desulfurization reactions (HDS1) of a petroleum type feed. The effluents of the first catalyst bed having an effluent sulfur content below or equal to 50 mg/kg are separated into two streams. The first stream, which is predominant, is sent to the gas oil pool. The second stream is mixed with oils of vegetable or animal origin. The resultant oil-petroleum cut mixture is then subjected to a milder hydrotreatment (HDT2). The effluents obtained at the outlet of the second catalyst bed can optionally be mixed with the predominant stream from the first bed. The process economy, the tolerance to the specifications relative to oils of animal or vegetable origin and the quality of the products obtained are thus greatly improved.

Methods of producing a total product are described. A method includes continuously contacting a feed with a hydrogen source in the presence of one or more inorganic salt catalysts and steam to produce a total product, wherein the feed has at least 0.02 grams of sulfur, per gram of feed; and producing a total product that includes coke and the crude product. The crude product has a sulfur content of at most 90% of the sulfur content of the feed.

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.

A reactor for conducting a process using supercritical water to upgrade a heavy hydrocarbon feedstock into an upgraded hydrocarbon product or syncrude with highly desirable properties (low sulfur content, low metals content, lower density (higher API), lower viscosity, lower residuum content, etc.) is described. The reactor is operable under continuous) semi-continuous or batch mode and is equipped with means to enable momentum, heat and mass transfer in and out of and within the reactor.

A process using supercritical water to upgrade a heavy hydrocarbon feedstock into an upgraded hydrocarbon product or syncrude with highly desirable properties (low sulfur content, low metals content, lower density (higher API) lower viscosity, lower residuum content, etc.) is described. The process does not require external supply of hydrogen nor does it use externally supplied catalysts. A reactor design to carry out the process is also described,

Processes are provided for producing a diesel fuel product having a sulfur content of 10 ppm by weight or less from feed sources that include up to 20% by weight of a biocomponent feedstock. The mineral hydrocarbon portions of the feed sources can be distillate or heavier feed sources.

The sulfur content of liquid cracking products, especially the cracked gasoline, of the catalytic cracking process is reduced by the use of a sulfur reduction additive comprising a porous molecular sieve which contains a metal in an oxidation state above zero within the interior of the pore structure of the sieve. The molecular sieve is normally a large pore size zeolite such as USY or zeolite beta or an intermediate pore size zeolite such as ZSM-5. The metal is normally a metal of Period 4 of the Periodic Table, preferably zinc or vanadium. The sulfur reduction catalyst may be used in the form of a separate particle additive or as a component of an integrated cracking/sulfur reduction catalyst.

A desulfurization method for a gas oil which includes a step of removing sulfur compounds contained in a gas oil distillate product by the adsorption with an adsorptive desulfurization agent formed of a fibrous active carbon and provided in an adsorption tower (1), and a desorption regeneration step of washing the used adsorptive desulfurization agent with an aromatic solvent to regenerate the desulfurization agent. The method allows the production of gas oil being satisfactorily freed of sulfur content at relatively low equipment and operation costs over a long period of time, and in the method, difficult-to-remove sulfur compounds, such as 4,6-DMDBT, and polycyclic aromatic compounds having two or more rings are selectively removed.

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 a sorbent for reducing sulfer content in hydrocarbon oil, which comprises 1 to 30 weight percent of rare earth faujasite, 5 to 40 weight percent of active metal oxide and 30 to 94 weight percent of carrier, wherein the carrier comprises alumina and zinc oxide. The mixture of the rare earth faujasite and the carrier is preformed into porous heat-resistant solid particles which are introduced with the metal active ingredient to prepare the sorbent; sulfer-containing light hydrocarbon oil raw material and hydrogen donors enter a reactor filled with the sorbent for separating reaction; materials and products after the separating reaction are sent to a subsequent separation system for product separation; sorbent to be regenerated after the reaction is burnt to be regenerated after steam stripping; and the regenerated sorbent is reduced by the hydrogen donors and returned to the reactor for recycling. The sorbent realizes deep removal of sulfer in the light hydrocarbon oil; meanwhile, the product gasoline has high octane number, low benzene content and high strength.

Very low sulfur content hydrocarbon gas is achieved by sequentially contacting the gas first with zinc oxide and then with nickel metal. This has reduced the total sulfur content of natural gas feed for a fluid bed syngas generator to less than 0.1 ppm and has resulted in greater syngas productivity. A zinc oxide guard bed downstream of the syngas generator reduces the total sulfur content of the syngas to less than 10 vppb and preferably less than 5 vppb. This very low sulfur content syngas is used for sulfur sensitive processes, such as hydrocarbon synthesis. The process is especially useful for natural gas which contains H2S, COS, mercaptans and other sulfur bearing compounds.

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.

This invention relates to a process and an installation for treatment of a heavy petroleum feedstock, of which at least 80% by weight has a boiling point of greater than 340° C., whereby the process comprises the following stages:

• • (a) Hydroconversion in a fixed-bed reactor operating with an upward flow of liquid and gas, whereby the net conversion in products boiling below 360° C. is from 10 to 99% by weight;
  • (b) Separation of the effluent obtained from stage (a) into a gas containing hydrogen and H₂S, a fraction comprising the gas oil, and optionally a fraction that is heavier than the gas oil and a naphtha fraction;
  • c) Hydrotreatment by contact with at least one catalyst of at least the fraction comprising the gas oil obtained in stage (b);
  • d) Separation of the effluent obtained at the end of stage (c) into a gas containing hydrogen and at least one gas oil fraction having a sulfur content of less than 50 ppm, preferably less than 20 ppm, and more preferably still less than 10 ppm,

the hydroconversion stage (a) being conducted at a pressure P1 and the hydrotreatment stage (c) being conducted at a pressure P2, the difference ΔP=P1−P2 being at least 2 MPa, the hydrogen supply for the hydroconversion (a) and hydrotreatment (c) stages being ensured by a single compression system with n stages.

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 discloses a gasoline deep desulphurization and olefin reduction method, comprising that the gasoline raw material and hydrogen are contacted with hydrogenation absorption desulphurization and olefin aromatization difunctional catalyst to remove sulfur in the gasoline and reduce the olefin content in the gasoline product. The method of the invention can produce gasoline product with the sulfur content lower than 50 micrograms per gram, and can further produce gasoline product with the sulfur content lower than 10 micrograms per gram while the olefin content is lower than 20v%, and meanwhile the antiknock quality index loss is low. The method of the invention can be applied to deep desulphurization and olefin reduction process of FCC gasoline, catalytic pyrolysis gasoline, coker gasoline, pyrolysis gasoline and pressure gasoline or the mixed gasoline raw material thereof.