279results about "Refining with aqueous alkaline solutions" patented technology

An improved method for desulfurizing a fuel stream such as a diesel stream is disclosed which includes generation of a sulfone oil, the desulfurization of the sulfone oil and the recycling of the resulting biphenyl-rich stream and ultra-low sulfur diesel streams. The method includes combining a thiophene-rich diesel stream with an oxidant to oxidize the thiophenes to sulfones to provide a sulfone-rich diesel stream. Sulfone oil is extracted from the sulfone-rich diesel stream to provide sulfone oil and a first low-sulfur diesel stream The low-sulfur diesel stream is recycled. The sulfone-rich oil stream is combined with an aqueous oxidant-containing stream, such as caustic stream, which oxidizes the sulfones to biphenyls and forms sulfite to provide a second low-sulfur diesel stream

The invention relates to a liquid hydrocarbon mercaptan removal technique capable of deeply removing total sulfur, in particular to a sweetening technique for liquefied gas in an oil refinery. The oil refining liquid hydrocarbon refers to components of liquefied gas and light gasoline, wherein the liquefied gas is a raw material for producing MTBE, and the light gasoline is a component for producing high-cleanness gasoline. In order to solve the problem of high total sulfur in the oil refining MTBE and the light gasoline, according to the shape and the distribution rule of sulfocompounds in the liquid hydrocarbon, processes such as functional reinforcement of a recycle solvent, three-phase mixed reinforced regeneration, regenerated catalyst and extractant separation and recycle solvent deoxidization and the like are adopted in the conventional process of liquid hydrocarbon extraction, oxidization and mercaptan removal, so the technical effects of reinforcing the mercaptan removal depth, improving carbonyl sulfide removal rate, and avoiding forming disulphide in the extracting, saving energy and reducing emission and the like are achieved. Thus, the liquid hydrocarbon can be deeply desulfurated, the problem of high total sulfur in the oil refining MTBE and the light gasoline is solved and the slag discharging quantity in the conventional process is greatly reduced.

A stable distillate fuel blend useful as a fuel or as a blending component of a fuel that is suitable for use in turbine engine, said fuel blend prepared from at least one highly paraffinic distillate fuel component having low to moderate branching and at least one conventional petroleum-derived distillate fuel component and a process for preparing same involving the blending of at least two components having antagonistic properties with respect to one another.

A process and apparatus to extract and recover heavy metals and sulfur from crude oil or petroleum fuel products including the steps of emulsifying the crude oil with an emulsifying agent, adding a leach solution to the emulsified crude oil and leaching the emulsified crude oil at elevated temperature and pressure to give a leached emulsified crude oil. The leach solution may be acid or alkali. A proportion of the leach solution is extracted for recovering heavy metals. There can also be a microwave hydro-treating step using hydrogen gas at a temperature below 220° C. to ensure there is no quality degradation in the crude feed to produce a desulfurized crude oil and a hydrogen sulphide by-product and recovering sulfur from the hydrogen sulphide by-product.

Described is an apparatus and process for extracting sulfur compounds from a hydrocarbon stream. A prewash section for converting hydrogen sulfide to sodium sulfide by reaction with an alkali such as caustic communicates with an extractor section disposed directly above the prewash section for converting mercaptans to mercaptides by reaction with alkali. Hydrocarbon product exits the extractor section through a coalescer that prevents alkali from exiting with the hydrocarbon product stream.

A process for upgrading an oil stream by mixing the oil stream with a water stream and subjecting it to conditions that are at or above the supercritical temperature and pressure of water. The process further includes cooling and a subsequent alkaline extraction step. The resulting thiols and hydrogen sulfide gas can be isolated from the product stream, resulting in an upgraded oil stream that is a higher value oil having low sulfur, low nitrogen, and low metallic impurities as compared to the oil stream.

Disclosed is an apparatus for extracting sulfur compounds from a hydrocarbon stream. A prewash section for converting hydrogen sulfide to sodium sulfide by reaction with an alkali such as caustic prepares the hydrocarbon stream for extraction. Spent alkali is continuously withdrawn and regenerated alkali is continuously added to the prewash section.

This invention relates to improved methods, processes and apparatus for the removal of sulfides from a gas, liquid or solid (substance) wherein the substance is contacted with an aqueous solution. The instant invention presents methods and processes wherein at least one of H₂S, SO₂ and CS₂ is chemically converted in an aqueous media to a salt and/or compound comprising sulfur and a cationic moiety. Said salt and/or compound comprising sulfur and a cationic moiety is herein termed a “Sulfur Salt”. After formation of the Sulfur Salt, the Sulfur Salt is converted to elemental sulfur with a bacterium capable of metabolizing sulfur. The preferred bacterium for metabolizing sulfur is a strain from the genus Thiobacillus. The most preferred strain from the genus Thiobacillus is Thiobacillus denitrificans. The instant invention prefers an aqueous operating pH of between 6.0 and 8.0, while the most preferred aqueous pH is between 6.0 and 7.0.

The invention relates to a mercaptan removal and lye regeneration device and a method for gasoline light fractions. The mercaptan removal and lye regeneration device for gasoline light fractions comprises a static mixer, a liquid film alkaline wash reactor, a lye coalescence remover, a lye oxidation separation tower and a liquid film extraction contactor. The mercaptan removal and lye regeneration device and the method for gasoline light fractions have the advantages that pre-alkaline washing is used for removing hydrogen sulfide and phenol, so that the investment is low; the two-stage liquid film alkaline wash reactor and the alkaline wash process are utilized, so that the mercaptan in products can be guaranteed to be below 10 parts per million (ppm), no free lye is carried, and the copper sheet corrosion and water-solutbility acid base detection can be guaranteed to be qualified with no water wash needed; the oxidation rate of mercaptan sodium in the lye is high, two-phase perturbation emulsification is quite slight, and more than 60% of generated disulphide can be separated and recycled; the content of the disulphide in the regenerated lye can be guaranteed to be no more than 100 ppm, and the regenerated lye cannot be re-extracted into products when used for removing mercaptan in a circulation mode; the total sulfur in products can be guaranteed to be stable and not rise without replacing the lye frequently, and compared with other processes, the discharge amount of alkaline residues is reduced by more than 50%.

The invention provides a method and device for desulfurization from hydrocarbon flow thorough alkaline liquid suction. It is to add a gas- removal system between oxidation system and phase separation system, and introduce inert gas into gas- removal system to exchange oxidative gas and then effectivelyt promote the separation of sulfur dioxide or sulfur dioxide- containing solvent from regenerative alkaline liquid in phase separation system, and the thiol in hydrocarbon flow can be inhibited from oxidation by oxidative gas in suction system, which enables thorough desulfurization by alkaline liquid suction.

This invention is a method for reducing the total acid number of organic acid containing petroleum oil comprising forming a water-in-oil emulsion comprising an aqueous Group IIA metal hydroxide solution or slurry in a hydrocarbon oil, said water-in-oil emulsion having an aqueous droplet particle size diameter of from 1 to 25μ, adding the water-in-oil emulsion to the organic acid containing petroleum oil and permitting the mixture to stand for a time sufficient to permit the neutralization of the organic acids in the petroleum oil.

A process for producing a naphtha having a decreased amount of sulfur by selective hydroprocessing a petroleum feedstream comprising cracked naphtha to reduce its sulfur content with minimum loss of octane. The reduced sulfur naphtha stream contains mercaptan sulfur reversion products that are removed preferably by use of an aqueous base solution containing a catalytically effective amount of a phase transfer catalyst.

A method for inhibiting and dissolving the deposits formed on caustic or alkaline scrubbers used in scrubbing acidic gases such as carbon dioxide, hydrogen sulfide, which are formed during the pyrolytic cracking of naphtha, ethane, and propane. The cracking operations produce certain oxygenated compounds such as vinyl acetate or acetaldehyde, which undergo polymerization under alkaline condition. The vinyl acetate on hydrolysis releases acetaldehyde under alkaline conditions. Amino acids such as 6 amino caproic acid and lactams such as epsilon caprolactam not only prevent but also dissolve the polymers formed by aldol condensation.

In a catalytic treatment process, mercaptans in sour hydrocarbon are oxidized to disulfide oils using an aqueous treatment solution containing a chelated polyvalent metal catalyst, alkali metal hydroxide, and the alkali metal salt of at least one alcohol in a non-dispersive mixing apparatus wherein an upgraded hydrocarbon containing the disulfide oils is produced.

A process for recovering ionic liquids comprising the steps of: providing a first ionic liquid mixture, the first ionic liquid having a halogen metallate anion, the mixture containing an organic solvent; adjusting the pH of the mixture to pH 7-10 by the addition of a base to form a first precipitate; separating the first precipitate from the mixture; removing the organic solvent from the first mixture to form a second precipitate and separating the second precipitate from the first mixture; acidifying the resulting mixture to pH 2-7 by the addition of an acid; and drying the mixture to obtain a second ionic liquid having a halogen anion.

A process to re-refine used petroleum oils by extraction with aliphatic solvents, wherein after eliminating the extract solvent, the process consists of the following treatments, (a) flash, continuous vaporization, at atmospheric pressure or near atmospheric pressure, to separate the light fractions, in the presence of small amounts of a basic compound or a reducing agent or a combination of both and (b) continuous distillation, in a fractionating column, of the bottom liquid obtained in stage (a), under vacuum and moderate temperatures, in the presence of a basic compound or a reducing compound or a combination of both, with recirculation from the bottom of the column to its feed; separating, as lateral extractions, the vacuum gas-oil or spindle oil and the lubricant bases and, as bottom product, a fuel-oil or asphaltic component.

The invention discloses a desulfurizer used for extraction of crude oil containing hydrogen sulfide and treatment of sewage containing hydrogen sulfide. The desulfurizer comprises, by mass, 25 to 40% of hydroxyethyl-hexahydro-s-triazine, 5 to 10% of micro-molecular alcohol, 1 to 2% of an osmotic agent sodium sulfosuccinate, 1 to 2% of acetic acid, 0.1 to 0.2% of sodium acetate and 0.02 to 0.04% of an antifoaming agent, with the balance being water, wherein the micro-molecular alcohol is methanol, or ethanol or a mixture of methanol and ethanol, and the antifoaming agent is a water-soluble polyether or silicone oil antifoaming agent. The desulfurizer provided by the invention has a simple formula, is intermiscible with water in any ratio and can effectively reduce hydrogen sulfide in crude oil or sewage; the desulfurizer rapidly reacts with hydrogen sulfide and a reaction product is soluble in water and does not block a pipeline; moreover, an s-triazine main agent has good scale-inhibition, anti-scale and sterilization properties; and the hydrogen sulfide removing agent in the invention overcomes the problems that an alcamine desulfurizer has rapidly reduced desulphurization efficiency at high temperature and hydrogen sulfide removed through reaction may be reversibly released again, and has a temperature application range of 0 to 120 DEG C.

The present invention provides a process for treating a hydrocarbon feed gas stream containing acid gases (CO₂, H₂S and mercaptans) by contacting the feed gas stream in a multi-section caustic tower, the bottom sections employing a recirculating caustic solution to remove the CO₂ and H₂S down to low single digits parts per million concentration and the upper sections employing a stronger caustic solution on a once-through basis to produce a mercaptans depleted gas stream.

The invention relates to a method of treating a liquid hydrocarbon (e.g. heavy oil, bitumen, etc.) containing naphthenic acids or other corrosive acids in order to partially or fully convert such acids into non-corrosive compounds. The method comprises adding an alkylating agent to the hydrocarbon, bringing the hydrocarbon into contact with an aqueous liquid containing an alkaline compound and a phase transfer catalyst to form an immiscible two-phase system, maintaining the contact to allow conversion of the naphthenic acids to non-corrosive oil-soluble esters, and separating the aqueous phase from the liquid hydrocarbon. Naphthenic acids are highly corrosive to plant and equipment and the method enables them to be converted to non-corrosive compounds in an economic manner.

A reaction system and method for removing heteroatoms from oxidized-heteroatom-containing hydrocarbon streams and products derived therefrom are disclosed. An oxidized-heteroatom-containing hydrocarbon feed is reacted in a reaction system thereby forming non-ionic hydrocarbon products. The products derived therefrom are useful as transportation fuels, lubricants, refinery intermediates, or refinery feeds.

A reaction system and method for removing heteroatoms from oxidized-heteroatom-containing hydrocarbon streams and products derived therefrom are disclosed. An oxidized-heteroatom-containing hydrocarbon feed is reacted in a reaction system thereby forming non-ionic hydrocarbon products. The products derived therefrom are useful as transportation fuels, lubricants, refinery intermediates, or refinery feeds.