148results about "Gasoline stabilisation" patented technology

The invention relates to a method for hydrotreating heavy oil, in particular to the method for hydrotreating heavy oil, which improves the quality of diesel oil. Heavy distillate oil and animal and vegetable oil are used as raw material oil; under the hydrotreatment condition, the raw material oil and hydrogen gas are mixed and pass through a hydrotreatment reaction region; hydrogen-rich gas which is obtained by separating oil generated by hydrotreatment is circulated and utilized; and liquid obtained by separation is distillated to prepare a diesel oil product and hydrogenated wax oil. Compared with the prior art, the method can effectively improve the material source of a wax oil hydrotreatment device, ensure the quality of the hydrogenated wax oil, substantially increase the quality ofthe hydrotreated diesel oil and improve the storage stability of the animal and vegetable oil as fuel oil.

The present invention relates to a method for producing fuel oil by utilizing coal tar. It is characterized by that said method includes the following steps: after the whole coal tar in which the moisture and ash are removed and diluting oil are mixed according to a certain mixing ratio, making the obtained mixture be successively passed through a shallow hydrogenation unit with hydrogenation protecting agent and prehydrogenation catalyst and a deep hydrogenation unit with main hydrogenation catalyst, then making the product obtained after deep hydrogenation undergo the processes of high-pressure separation, low-pressure separation and fractionation so as to obtain light-oil fraction, medium-oil fraction and tail-oil fraction, namely obtain low-sulfur low-nitrogen fuel oil and light oil product.

The invention relates to a new process for more efficient separation and recovery of light olefins such as ethylene and propylene from a fluid catalytic cracking unit. The new process invention for recovering olefins from a mixture of cracked hydrocarbons from a fluid catalytic cracker comprises the steps of: (a) providing a mixture of cracked hydrocarbons including methane, ethylene, ethane, propylene, propane, butylene, butane and heavier hydrocarbons such as naphtha produced in a fluid catalytic cracker; (b) separating said mixture into (i) a first stream comprising substantially all of said ethane, ethylene, and methane and a major portion of said propane and propylene and (ii) a second stream comprising a portion of said butylene and butane, and a major portion of said heavier hydrocarbons; and (c) processing said first stream to recover the ethylene and propylene therefrom, and the details of such process described herein.

A processing method and system for separating methane-rich and ethane-rich components from an LNG stream. The LNG stream is preheated against a distillation column overhead vapor stream and against an overhead vapor product prior to entering the column. The overhead vapor product is methane-rich. The LNG stream may further be preheated against the column bottoms and another heating medium. The method may also include compressing the methane-rich product, condensing it against the LNG stream, and pumping it. The system may also comprise third and fourth heat exchangers configured to preheat the LNG stream with the bottoms product and the heating medium. Further, the system may provide for compressing the overhead vapor product prior to the its exchanging heat with the LNG stream and a pump for pumping condensed overhead vapor product. Additionally, the system generates all of the required reflux by cross exchanging the column overhead with the incoming LNG stream.

A process for the recovery of gaseous products from the product mixture obtained by contacting a hydrocarbon feed with a catalyst in a fluid catalytic cracking process, wherein the liquid, obtained by separating the top product of main fractionators into gaseous and liquid fraction, when supplied to the absorber has a temperature of between about 8–25 DEG C. This liquid may be pre-saturated with gaseous top product from absorber; or also a high boiling fraction (cat cracker naphtha/light cycle oil) may be first separated from this liquid by distillation.

The invention relates to a hydro-upgrading method for catalytic cracking gasoline; the method comprises the following steps: gasoline whole fraction is cut into light fraction and heavy fraction; the cutting point is 60 DEG C to 80 DEG C; mercaptan in the light gasoline fraction is removed through mercaptan removal alkali washing; the heavy gasoline fraction and hydrogen gas have catalytic hydrodesulfurization, denitrogenation and olefin saturated reaction; reactor effluent or the reactor effluent after removing hydrogen sulfide is contacted with octane value restore catalyzer, and isomerization, aromatizatian and building up reaction are implemented, hydrogenated oil is separated and lighter hydrocarbon gasoline fraction is obtained, hydrogen-rich gas at the top of a high partial tank is circularly used through hydrogen sulfide removal, and lighter hydrocarbon at the top of a stabilizer tower is feedback to a fractionation tank to be fractionated again; the condition of the hydrotreating reaction is that hydrogen partial pressure is 1.5 to 3.0 MPa; the reaction temperature is 250 to 320 DEG C; the liquid hourly space velocity is 3.0 to 5.0 h<-1>, and the hydrogen-oil ratio is 200 to 500 Nm<3>/m<3>; the sulfur content of the gasoline product is smaller than 100 ppm, the octane value is unchanged, and the yield of gasoline reaches 98.5 weight percent.

Processing schemes and arrangements for application of a dividing wall separation column in the processing of an effluent resulting from FCC processing modified for increased light olefin production. The dividing wall separation column desirably splits a naphtha feedstock produced or resulting from such modified FCC processing to produce or form a light fraction containing C₅-C₆ compounds, an intermediate fraction containing C₇-C₈ compounds and a heavy fraction containing C₉+ compounds.

A process is disclosed for enhanced recovery of propylene and LPG from the fuel gas produced in Fluid catalytic cracking unit by contacting a heavier hydrocarbon feed with FCC catalyst. In the conventional process, the product mixture from FCC main column overhead comprising naphtha, LPG and fuel gas, are first condensed and gravity separated to produce unstabilized naphtha, which is subsequently used in the absorber to absorb propylene and LPG from fuel gas. However, the recovery of propylene beyond 97 wt % is difficult in this process since unstabilized naphtha already contains propylene of 5 mol % or above. In the present invention, C₄ and lighter components from unstabilized naphtha are first stripped off in a separate column to obtain a liquid fraction almost free from propylene (<0.1 mol %) and other LPG components. Such a stripped liquid fraction, after cooling to 20° C. to 30° C., is used in the absorber to absorb higher amounts of propylene and LPG from fuel gas, leading to improved recovery of propylene.

A process for ethane extraction from a gas stream based on turboexpansion and fractionation with no mechanical refrigeration is provided. The feed gas is sweetened and dehydrated by a conventional amine process and by a molecular sieve unit, to remove carbon dioxide and water. After this pretreatment, the feed gas undergoes to a series of cooling steps through a cryogenic brazed aluminum heat exchanger and fed to a demethanizer column. A stream rich in methane is recovered from the top of this column and fed to a centrifugal compressor and subsequently routed to a booster/turboexpander. The temperature of the methane gas is greatly reduced by the expansion allowing the cooled methane stream to be a cooling source for cryogenic heat exchanger. Feed for a de-ethanizer column comes from the bottom liquids of the de-methanizer column. Ethane is recovered overhead at the de-ethanizer column.

The invention discloses a method for producing fuel oil through hydrotreating in coal tar, which comprises the following steps: hydrotreating and feeding the coal tar to do pre-hydrotreating reaction and main-hydrotreating reaction after preprocessing coal tar, fractionating hydrogenated oil, and separating out low sulfur and low nitrogen light oil and fuel oil. The method leads a reaction condition to be softer, which inhibits and alleviates the coking process of coal tar hydrogenation material under high temperature with high efficiency, lowers bed layer temperature rising of a reactor, prolongs the service span of pre-hydrogenation catalyst, and assures the operation of longer cycle of the coal tar hydrogenation unit.

The present invention relates to a process and apparatus for recovering product from reactor effluent of a reactor for a hydrocarbon feedstream. An indigenous C₄ stream is used as lean oil in a demethanizer, which facilitates significant cost and operational savings. C₄ bottoms from a downstream depropanizer is used as lean oil recycle.

The invention relates to a hydrogenation process for preparing oil products from coal tar which is generated together with exhaust gas synthesized during preparation of methanol from a coke oven and coal gas. Methanol is prepared from coal gas which is the by-product of the coke oven, large amount of relief gas and nitrogen gas during the methanol preparation process, hydrogen is extracted from the relief gas and used as one of the materials for hydrogenation preparing light fule oil from tar, nitrogen is extracted as the material of a coke dry quenching unit, the heat energy generated during the coke dry quenching process is used for generating electric power. With the recycling of coke oven coal gas, the prior exhaust gas which is directly exhausted or burnt is changed into a high-value product, such as electricity, methanol, light fuel oil, advanced charcoal material, etc., at the same time, the object of energy conservation can be realized.

The invention relates to a method for producing catalytic reformed feedstock by taking light and medium gasoline distillates as raw materials and extracting selective solvent to extract and rectify catalytically cracked gasoline in the absence of hydrogen. The method comprises the following steps: 1, fractionation prefabrication of light and medium distillate raw materials of catalytically cracked gasoline; and 2, extraction, rectification, desulfuration and dearomatization of light and medium distillates of catalytically cracked gasoline, wherein light and medium distillates of catalyticallycracked gasoline obtained in step 1 are fed into the middle-lower part of an extraction-rectification tower, while fresh extraction agent or recycled extraction agent is added from the upper part of the extraction-rectification tower; thus, the light and medium distillates contact the extraction agent inside the tower to generate desulfurized and dearomatized light-component raffinate phase (i.e.catalytic reformed feedstock product) rich in olefin hydrocarbon at the top of the tower after extraction, rectification, desulfuration and dearomatization. The method carries out desulfuration and dearomatization of catalytically cracked gasoline at the same time and reclaims solvent, thereby having the advantages of simple process, moderate operation conditions, hydrogen source saving and low production cost.

The invention discloses a catalytic conversion method which belongs to the technical field of catalytic conversion of petrolic alkanes. The catalytic conversion is carried out in a first reaction system and a second reaction system sequentially; after raw oil enters the first reaction system for catalytic reaction, all or part of the produced fractions enter the second reaction system in gaseous state and/or liquid state for further catalytic reaction; the first reaction system and the second reaction system respectively use a corresponding catalyst according to different reaction raw materials and target products. By using two reaction systems, the method of the invention using pertinence catalysts to carry out selective catalytic conversion of different fractions, overcomes the deficiencies of poor selectivity and low adjuvant content, and diluting the catalyst when adopting single catalyst, can enhance the productivity of chemical raw materials such as low carbon alkene, etc. and enhance the yield of products; the method overcomes the shortcoming of large energy consumption for cooling and preheating and saves investment, thus greatly enhancing the economical efficiency.

The invention discloses a method for producing chemical raw material and diesel oil by Fischer-Tropsch synthetic wax and the method is that the Fischer-Tropsch synthetic wax and hydrogen gas contact with hydrogen cracking catalyst under hydrogen cracking condition and then the reaction products are treated by fractionation; diesel distillate obtained is the clean diesel with a low freezing point, while the naphtha cut obtained is high-quality raw material used for cracking of steam to ethane, and distillation range is higher than the hydrogen cracking of tail oil circulation of the diesel oil, wherein, the hydrogen cracking catalyst is the hydrogen cracking catalyst containing Beta zeolite and the weight content of the Beta zeolite in the catalyst is 0.5 percent to 60 percent; the Beta zeolite has properties that SiO2/Al2O3 molar ratio is 20 to 150 and Na2O less than or equal to 0.2w percent. The method of the invention can prepare the Fischer-Tropsch synthetic wax into the clean diesel oil with a low freezing point and high-quality raw material used for producing ethylene by steam cracking.

A process and apparatus that uses a debutanizer with a side stripper can recover a light stream, an intermediate stream and a liquid stream. One of the intermediate stream and the liquid stream can be recycled to oligomerization or to fluid catalytic cracking.

The invention relates to a process for removing tar oil with gasification gas. At present, the operating cost and the maintenance cost of the present process for removing tar oil are high, and the second pollution of the waste water of tar oil is brought out. The concrete steps of the invention are that waste rubber and plastic used for schizolysis are conveyed to a schizolysis furnace and oil gas mixture and solid charcoal are generated after the heat schizolysis reaction, the oil gas mixture produced by the schizolysis reaction is separated via a rectifying tower and then oil products and gas are generated, and the distillate with the temperature of 200-350 DEG C is separated out as oil washing distillation cut which is employed to absorb the tar oil in the gasification gas which contains tar oil. Compared with the existing technology, the process for removing tar oil in gasification gas has high process reliability, increases the thermal value of the gas, reduces the operation cost , produces no waste water of tar oil, and promotes the added value of the tar product .

Methods and systems for the devolatilization of thermally produced liquids to raise the flash point are disclosed. Various methods and apparatus can be used to effectively reduce the volatile components, such as wiped film evaporator, falling film evaporator, flash column, packed column, devolatilization vessel or tank.

The invention relates to a separation method of a Fischer-tropsch synthesized crude product. The method comprises a plurality of technological steps: crude separation of products, oil hydrogenation, alkane refining, solvent oil refining, wax hydrogenation, wax refining and the like, and according to different synthesis temperatures of the Fischer-tropsch synthesized crude product, different quantities of various high-added-value products such as naphtha, n-pentane, n-heptane, DSP100, DSP40, DSP80 or DSP110 solvent oil, C50, C70 or C80 series wax, H1 and H105 series wax and the like can be obtained. The separation method has the advantages of improving the added value of the Fischer-tropsch synthesized crude product, and being simple in technological flow, and easy for industrial production.

A process for the recovery and purification of ethylene and optionally propylene from a stream containing lighter and heavier components that employs an ethylene distributor column and a partially thermally coupled distributed distillation system.